JPH0963190A - Multilayer disc recording / reproducing method and apparatus - Google Patents

Abstract

(57) Abstract: To enable simultaneous recording / reproduction on a multi-layer disc. An optical pickup includes a first multi-layer disc.
The signal read from the signal surface is written in the first memory 8, and when the data storage amount of the first memory 8 becomes full, the CPU 6 switches the selection switch 5 to the L side by the signal F1. At the same time, a focus jump command from the CPU 6 causes the optical pickup 3 to make a focus jump to the second signal surface. Then, the signal read by the optical pickup 3 is written in the second memory 10. When the amount of accumulated data in the second memory 10 becomes full, the state returns to the initial state and the read data is written in the first memory 8. The decoders 9 and 11 read the signals from the first memory 8 and the second memory 10 over the entire period and decode the signals, so that the signals can be reproduced from a plurality of layers of the disc 1 at the same time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer disc recording / reproducing method and apparatus for simultaneously recording / reproducing from a plurality of signal faces of a multi-layer disc having two or more signal faces.

[0002]

2. Description of the Related Art Conventionally, a multi-layer disc having two or more signal surfaces has been known. In such a multi-layer disc player, a signal is read from any one of the signal surfaces and reproduced.

[0003]

However, the conventional multi-layer disc player cannot reproduce signals from a plurality of signal surfaces of the multi-layer disc at the same time. Further, a recording device capable of simultaneously recording on a plurality of signal surfaces of a multi-layer disc has not been known. Therefore, it is an object of the present invention to provide a multi-layer disc reproducing method and device capable of simultaneously reproducing from a plurality of signal surfaces of a multi-layer disc. Another object of the present invention is to provide a multilayer disc recording method and apparatus capable of simultaneously recording on a plurality of signal surfaces of a multilayer disc. Another object of the present invention is to provide a multilayer disc recording / reproducing method and apparatus capable of simultaneously recording / reproducing on / from a plurality of signal surfaces of a multilayer disc.

[0004]

In order to achieve the above object, a multi-layer disc reproducing method according to the present invention, in the case of simultaneously reproducing a plurality of layers of signals from a multi-layer disc having two or more signal surfaces, A plurality of memories for accumulating the signals read from the respective layers, and the signals read from the respective layers sequentially in a time division manner in each of the plurality of memories,
It is accumulated until the amount of accumulated data in that memory is full,
When the signal read from the next layer starts to be stored in the next memory when it becomes full, and when the data storage amount of the final memory that stores the signal read from the last layer becomes full , The process of accumulating the signals read from each layer of the plurality of layers in a cyclic manner so that the accumulation of the signals read from the first layer into the first memory is restarted. In addition, the signals are read from the plurality of memories for the entire period and reproduced at the same time.

Further, the multilayer disc reproducing apparatus of the present invention is
A multi-layer disc having a signal surface of two or more layers, a pickup for reading signals from any one of the layers of the multi-layer disc, a plurality of memories for accumulating the signals of the respective layers read by the pickup, and a plurality of the memories. A plurality of decoders for respectively reproducing the signals read from the respective memories, and a controller for performing the read control of the pickup and the write / read control of the plurality of memories are provided, and the controller is provided from each layer of the plurality of layers. The signal read by the pickup is sequentially written into each of the plurality of memories in a time division manner, and when the amount of accumulated data in the memory becomes full, the memory next to the signal read from the next layer Data is stored in the final memory, and the amount of data stored in the final memory that stores the signals read from the final layer becomes full. At times, the process of writing the signals read from each layer of the plurality of layers to the plurality of memories is repeated so that the writing of the signal read from the first layer to the first memory is restarted. Further, the controller controls the signals to be read from the plurality of memories for the entire period so that the read signals are reproduced by the plurality of decoders at the same time. is there.

According to the multi-layer disc recording method of the present invention which achieves the above object, when signals of a plurality of layers are simultaneously recorded on a multi-layer disc having a signal surface of two or more layers, the signals to be recorded in the respective layers of the plurality of layers are accumulated. A plurality of memories for reading the signals to be sequentially recorded in the respective layers in a time division manner from the plurality of memories, and when the amount of accumulated data in the memories becomes empty, the signals to be recorded in the next layer are recorded. The process to read from the next memory is started, and the signal to be recorded in the final layer is stored. When the signal is read from the final memory and the data storage amount becomes empty, it is recorded in the first layer. The process of reading the signals recorded in each of the plurality of layers from the plurality of memories is cyclically performed so that the process of reading the signals from the first memory is restarted, and the plurality of memories are read. Encoded signal over the entire period is written to, in which so as to be recorded simultaneously.

The multi-layer disc recording apparatus of the present invention is
A multi-layer disc having a signal surface of two or more layers, and a pickup for recording a signal on any layer of the multi-layer disc,
A plurality of memories storing signals to be recorded in each layer by the pickup, a plurality of encoders encoding the signals stored in the plurality of memories, recording control of the pickup and writing / writing of the plurality of memories. A controller for performing read control, the controller reading signals to be sequentially recorded in the respective layers in a time division manner from the plurality of memories, and when the accumulated data amount of the memory becomes empty, the controller reads the signals to the next layer. When the process of reading the signal to be recorded from the next memory is started and the signal is read from the final memory that stores the signal to be recorded in the final layer and the data storage amount becomes empty, the first The signals to be recorded in the layers are recorded in the respective layers of the plurality of layers so that the process of reading the signals from the first memory is restarted. The process of reading out the signal is controlled so as to circulate, and further, the controller is controlled so that the encode signals from the plurality of encoders are written and simultaneously recorded in the plurality of memories for the entire period. It is a thing.

According to the multi-layer disc recording / reproducing method of the present invention which achieves the above-mentioned object, when signals of plural layers are simultaneously recorded / reproduced on / from a multi-layer disc having a signal surface of two or more layers, the signals are read from predetermined layers of the plural layers. First to store the emitted signal
Memory and a second memory for accumulating a signal to be recorded in each of the predetermined layers of the plurality of layers. The first memory has one or more memory areas, and each memory area is time-divisionally divided. The signals sequentially read from each layer are accumulated until the amount of accumulated data in that memory area becomes full, and when the signals become full, the accumulation of the signal read from the next layer in the next memory area is started. Then, when the data storage amount of the final memory area for accumulating the signal read from the final layer becomes full, time division is performed from each memory area of the second memory having the one or more memory areas. When signals to be recorded in the respective layers are sequentially read out, and the amount of accumulated data in the memory area becomes empty, the process of reading the signal to be recorded in the next layer from the next memory area is started, and the final layer Store signal to record And is a signal from the last memory area is read out, and when the data accumulation amount becomes empty,
The first memory is read from one or more layers of the plurality of layers such that the signal read from the first layer is restarted in the first memory area of the first memory. The process of accumulating the signals and the process of reading the signals recorded in the one or more layers of the plurality of layers from the second memory are cyclically performed, and the signals are output from the first memory over the entire period. The read signal is read out and reproduced, the encode signal is written into the second memory over the entire period, and the second signal is recorded and reproduced at the same time.

The multi-layer disc recording / reproducing apparatus of the present invention reproduces signals from any one of the layers of the multi-layer disc and a multi-layer disc having a signal surface of two or more layers. A pickup for recording a signal on a first memory, a first memory having one or more memory areas in which signals reproduced by the pickup are written, and one or more memory areas for storing signals recorded by the pickup And a decoder for reproducing the signal read from the first memory, an encoder for encoding the signal stored in the second memory, a recording / reproducing control of the pickup, and A controller for performing write / read control of the first memory and the second memory, the controller including the controller of each of the first memories. In the memory area, the signals read from each of the layers are sequentially written in a time division manner until the amount of accumulated data in the memory area becomes full, and when the signals become full, the next signal of the signal read from the next layer is written. When writing to the memory area is started and the signal accumulated in the final memory area where the signal read from the final layer is written becomes full,
The signals to be recorded in the respective layers are sequentially read out from the respective memory areas of the second memory in a time division manner, and when the amount of accumulated data in the memory areas becomes empty, the signals to be recorded in the next layer are When the process of reading from the memory area of is started and the signal is read from the final memory area that is accumulating the signal to be recorded in the final layer and the data storage amount becomes empty, Accumulating signals read from one or more layers of the plurality of layers in the first memory so that accumulation of the read signals in the first memory area of the first memory is restarted. And a process of reading a signal recorded in the one or more layers of the plurality of layers from the second memory so as to circulate, and
The controller reads a signal from the first memory over the entire period, reproduces it by the decoder, writes an encoded signal from the encoder over the second memory over the entire period, and simultaneously records and reproduces. The control is performed so as to control.

Recording / recording on such a multilayer disc of the present invention
According to the reproducing method and apparatus, it is possible to simultaneously reproduce from a plurality of signal surfaces of the multilayer disc, simultaneously record to a plurality of signal surfaces, and record and reproduce to a plurality of signal surfaces at the same time. Therefore, it is possible to output and display a plurality of different reproduced images and the like from one player. Further, a plurality of different image signals and the like can be simultaneously recorded on the multilayer disc by one recorder. In addition, 1
It becomes possible to record while reproducing on a multi-layer disc by one recorder player.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of a reproducing apparatus for a multilayer disc of the present invention, which embodies the reproducing method for a multilayer disc of the present invention, is shown in FIG. 1 (a), and FIG. A schematic configuration is shown. Further, FIG. 2 shows an operation timing chart of the reproducing apparatus for the multilayer disc shown in FIG. FIG. 1B shows a schematic structure of a multi-layer disc having two signal surfaces. The multi-layer disc 1 has a first signal surface 1-2 and a second signal surface 1.
-3 and 3 are laminated, and a protective layer 1-1 and a protective layer 1-4 are provided before and after that. This first
The signal surface 1-2 is formed of a semitransparent film, and the second signal surface 1-3 is formed of a reflective film. In this figure, the laser light focused by the objective lens 2 is focused on the first signal surface 1-2, and the signal can be read from the first signal surface 1-2.

As shown in FIG. 1, the reproducing apparatus for a multi-layer disc irradiates a laser beam or the like from an optical pickup 3 through an objective lens 2 onto a multi-layer disc 1 having such a two-layered signal surface so as to focus it. The signal is read from one of the signal planes. R read from the optical pickup 3
The F signal is reproduced into the original digital signal by the analog / digital converter (A / D) 4 and the selection switch (S
W1) 5 is input to the movable contact. Select switch (SW
1) 5 selects and supplies the reproduction signal read from the optical pickup 3 to the first memory 8 or the second memory 10.

The central processing unit (CPU) 6 has status information F1 from the first memory 8 and the second memory 10.
Upon receiving F2, a switch changeover signal S for controlling the selection switch 5 is output, and a jump command signal J1,
J2, a focus command signal, and a tracking servo command signal are output to the servo means 7. The servo means 7 receives the focus command signal and the tracking servo command signal from the CPU 6, and performs the focus servo control and the tracking servo control of the optical pickup 3. Further, in response to the jump command signals J1 and J2, a focus jump from the first signal surface 1-2 to the second signal surface 1-3, or from the second signal surface 1-3 to the first signal surface 1-2. Do a focus jump.

The first memory 8 has a selection switch (SW
1) The signal read from the first signal surface 1-2 sorted by 5 is written, and the second signal surface 1-3 sorted by the selection switch (SW1) 5 is written in the second memory 10.
The signal read from is written. Then, the first memory 8 and the second memory 10 respectively output the state signal F1 or the state signal F2 indicating the state to the CPU 6 when the data storage amount becomes full. In addition, the decoder 9 and the decoder 11 read signals from the first memory 8 and the second memory 10 respectively over the entire period, and the signals recorded on the first signal surface 1-2 are reproduced from the decoder 9 and the video is reproduced. A signal (VIDEO 1) and an audio signal (AUDIO 1) are output, and the signal recorded on the second signal surface 1-3 is reproduced from the decoder 11 and is reproduced as a video signal (VIDEO 2) and an audio signal (AUDIO 2). Is output.

The operation of the multi-layer disc reproducing apparatus of the present invention thus constructed will be described with reference to the operation timing chart shown in FIG. 2A shows a change in the amount of data stored in the first memory 8, FIG. 2B shows a change in the amount of data stored in the second memory 10, and FIG. Status signal F1 output from the memory 8, second
The status signal F2 output by the memory 10 and the CPU 6
The timings of the jump command signals J1 and J2 and the switch switching signal S output by

It is assumed that the optical pickup 3 is reading a signal from the first signal surface 1-2 of the multilayer disc 1 at the timing when the time t is t0. In this case, the CPU 6 switches the selection switch (SW1) 5 to the H side, that is, the first memory 8 side. Then, the signal read from the optical pickup 3 is supplied to the first memory 8 by the selection switch (SW1) 5, and the writing to the first memory 8 is started at the timing of time t0. At this time, the speed at which the optical pickup 3 reads the signal from the multilayer disc 1 is set to 10 Mbps, and the decoder 9 and the decoder 11 are used.
If the average speed of reading signals from the memories 8 and 10 and decoding is 3 Mbps, the first memory 8 has 1
Since data from the multi-layer disc 1 is written at 0 Mbps and data is read at 3 Mbps at the same time,
Data is accumulated at a speed of about 7 Mbps.

When the amount of data in the first memory 8 becomes full at time t1, the first memory 8 outputs to the CPU 6 a status signal F1 indicating that it is full. CPU6
In response to this, the jump command J2 is output to the servo means 7, and the servo means 7 controls the optical pickup 3 to focus jump from the first signal surface 1-2 to the second signal surface 1-3 of the multilayer disc 1. Let At the same time, the CPU 6 inverts the switch switching signal S. As a result, the optical pickup 3 comes to read a signal from the second signal surface 1-3, and the read signal is input to the second memory 10 via the selection switch (SW1) 5 switched to the L side. Written. In this case, in order to search for the last signal sent to the second memory 10 by the previous access and write the signal continuously, the second signal plane 1- The signal read from 3 is written in the second memory 10.

In this search, since a signal is recorded on the multi-layer disc 1 with a sector as a minimum unit, a desired signal is searched by using the sector address. At this time, the signal read from the multi-layer disc 1 at 10 Mbps is written in the second memory 10, and the decoder 11 reads the signal from the second memory 10 at an average of 3 Mbps. As shown in b), data is accumulated at a speed of about 7 Mbps. Then, when the data storage amount of the second memory 10 becomes full at time t3, the second memory 10 sends a state signal F2 indicating this full state to the CPU 6.

In response to this, the CPU 6 receives the jump command J
1 is output to the servo means 7, and the servo means 7 controls the optical pickup 3 to cause a focus jump from the second signal surface 1-3 of the multilayer disc 1 to the first signal surface 1-2. At the same time, the CPU 6 inverts the switch switching signal S.
As a result, the optical pickup 3 returns to the first signal surface 1-2 again.
Signal is read from the
It is input to and written in the first memory 8 via the selection switch (SW1) 5 which is switched to the side. in this case,
After the search time from time t3 to time t4, the last signal sent to the first memory 8 by the previous access is searched and the signal is written continuously after that.
The signal read from the first signal surface 1-2 is written in the first memory 8.

Such an operation is repeated, and signals are alternately read from the first signal surface 1-2 and the first signal surface 1-3 of the multilayer disc 1 as shown in FIG. The signals from 1-2 are stored in the first memory 8 and the second signal surface 1
When the signal from -3 is written in the second memory 10, the data storage amount changes as shown in the figure. At this time, the decoder 9 reads and reproduces the signal recorded on the first signal surface 1-2 from the first memory 8 for the entire period, and at the same time, the decoder 11 outputs the second signal from the second memory 10 for the entire period. The signal recorded on the surface 1-3 is read and reproduced. That is, it is possible to simultaneously reproduce two different images and sounds recorded on the respective signal surfaces of the multilayer disc 1 and display / reproduce them on a television receiver or the like.

In this case, the condition for simultaneous reproduction is that the amount of signal that the optical pickup 3 can read out in a unit time is larger than the total amount of signals reproduced in the unit time by the decoder 9 and the decoder 11. It becomes a condition.

Next, the operation of the above-described reproducing apparatus for a multilayer disc according to the present invention will be described again with reference to the flow chart shown in FIG. When reproduction is instructed in the reproducing apparatus of the multilayer disc, this flow chart is started, and after jumping to the first layer which is the first signal surface 1-2 in step S10, the track search to the last portion of the previous reproduction is performed. . In this case, immediately after the reproduction instruction, since there is no previous access, the first part of the signal is searched. Next, in step S12, the selection switch (SW1) 5 is switched to the H side, that is, the first memory 8 side, and the data reproduced from one layer is written in the first memory 8 in step S14.

Next, in step S16, it is determined whether or not the amount of data stored in the first memory 8 is full.
In this case, if the data storage amount is not full, it is determined to be "NO", and the process returns to step S14 and further 1
The data reproduced from the layers is written in the first memory 8. As a result, when it is determined in step S16 that the data storage amount of the first memory 8 is full, "YE
S "is determined and the process proceeds to step S18. The determination in step S16 is performed every time the sector, which is the minimum recording unit, is read.

In step S18, after the focus jump to the second layer which is the second signal surface 1-3, the track search to the last data portion of the previous reproduction is performed. Then
In step S20, the selection switch (SW1) 5 is on the L side,
That is, the data which is switched to the second memory 10 side and is reproduced from the two layers in step S22 is the second memory 1 side.
Written to zero. Next, in step S22, it is determined whether or not the amount of data stored in the second memory 10 is full.

In this case, if the data storage amount is not full, it is determined to be "NO", the process returns to step S22, and the data reproduced from the two layers is stored in the second memory 10.
It is written to. As a result, in step S24, the second
When it is determined that the amount of data accumulated in the memory 10 is full, it is determined to be "YES" and the process returns to step S10,
The processes of steps S10 to S24 are cyclically executed. The determination in step S24 is performed every time the sector, which is the minimum unit of recording, is read. In this way, the data is alternately written to the first memory 8 and the second memory 10, and the memory to be written is switched when the data storage amount becomes full. It should be noted that the "full data storage amount" state does not mean a state in which there is no free space in the memory, but a state in which there is no free space.

Next, FIG. 4 shows a modified example of the embodiment of the disc reproducing apparatus of the present invention. This disc reproducing apparatus is a multi-layer disc 1 on which the image and sound shown in FIG. 1 are recorded. Data is recorded in place of images and sounds. The decoder 9 and the decoder 11 simultaneously reproduce and output the data recorded on the first signal surface 1-2 and the second signal surface 1-3. There is. The structure and operation of this disc reproducing apparatus are the same as those of the disc reproducing apparatus shown in FIG. 1, and therefore detailed description thereof will be omitted, but the first signal surface 1-2 and the first signal surface 1-2 of the multilayer disc 1 having two layers 2 signal side 1
The data read alternately from -3 is the first memory 8
And the second memory 10 are alternately written, and the decoder 9 or the decoder 11 reads and decodes the data from the first memory 8 and the second memory 10 over the entire period, and outputs the data as data 1 and data 2 at the same time. .

Next, FIG. 5 shows another modification of the embodiment of the disc reproducing apparatus of the present invention. This disc reproducing apparatus is a multi-layer disc 1 in which the image and the sound shown in FIG. 1 are recorded. Is three layers and independent data is recorded in each layer. The decoder 9 records the data recorded on the first signal surface and the decoder 11 records the data recorded on the second signal surface. The decoder 13 simultaneously reproduces and outputs the data recorded on the third signal surface.

Since the structure and operation of this disc reproducing apparatus are almost the same as those of the disc reproducing apparatus shown in FIG. 1, detailed description thereof will be omitted, but the first signal surface of the multilayer disc 1 having three layers, The data sequentially read from the second signal plane and the third signal plane are stored in the first memory 8 and the second memory plane.
The first memory 8, the second memory 10, and the third memory 12 are sequentially written in the memory 10 and the third memory 12.
The data constantly read from the memory 12 is decoded by the decoder 9, the decoder 11, or the decoder 13, and is simultaneously output as data 1, data 2 and data 3.

Next, FIG. 6 shows the configuration of an embodiment of the disc recording apparatus of the present invention which embodies the disc recording method of the present invention. The recording device for the multilayer disc shown in this figure is
Multilayer disc 2 having two layers of signal surfaces as shown in FIG.
1. The objective lens 2 receives laser light from the optical pickup 23
Illuminate through 2 and record the signal on either signal surface. An RF signal recorded from the optical pickup 23 is converted into a recordable analog signal by a digital / analog converter (D / A) 24, and the D / A converter 24 is input to a selection switch (SW1) 25. One of the signals read from the first memory 28 and the second memory 30 is input.

The selection switch (SW1) 25 is switched to the H side and read from the first memory 28 when the optical pickup 23 is recording a recording signal on the first signal surface of the multilayer disc 21. Is selected to record on the first signal surface, and the optical pickup 23
When the recording signal is recorded on the second signal surface of No. 1, the signal read from the second memory 30 by switching to the L side is selected to be recorded on the second signal surface. The central processing unit (CPU) 26 receives the status information E1 and E2 from the first memory 28 and the second memory 30, outputs a switch switching signal S for controlling the selection switch 25, and jump command signals J1 and J2. The focus command signal and the tracking servo command signal are output to the servo means 27.

The servo means 27 receives the focus command signal and the tracking servo command signal from the CPU 26,
Focus servo control and tracking servo control of the optical pickup 23 are performed. Further, in response to the jump command signals J1 and J2, a focus jump from the first signal surface of the multilayer disc 21 to the second signal surface or a focus jump from the second signal surface of the multilayer disc 21 to the first signal surface is performed. . In the first memory 28, the video (VI
The DEO 1) signal and the audio (AUDIO 1) signal are written over the entire period, and the video (VIDEO 2) signal and the audio (AUDIO 2) signal encoded by the second encoder 31 are stored in the second memory 30. Written over the entire period.

The data speed written from the optical pickup 23 to the multilayer disc 21, that is, the data speed read from the first memory 28 or the second memory 30 is generally 10 Mbps, and the encoder 29 is used.
Alternatively, the data rate written from the encoder 31 to the first memory 28 or the second memory 30 is 3M on average.
bps. Then, the first memory 28 and the second memory
When the amount of data accumulated in the memory 30 becomes empty,
The state signal E1 or the state signal E2 indicating the state is output to the CPU 26, respectively.

The operation of the multi-layer disc recording apparatus of the present invention thus constructed will be described with reference to the operation timing chart shown in FIG. 7A shows a change in the amount of data stored in the first memory 28, FIG. 7B shows a change in the amount of data stored in the second memory 30, and FIG. The status signal E1 output from the memory 28, the status signal E2 output from the second memory 30, and the CPU
26 shows the timings of the jump command signals J1 and J2 and the switch switching signal S output by 26.

In FIG. 7, it is assumed that the optical pickup 23 records a signal on the first signal surface of the multilayer disc 21 at the timing of time t0. In this case, the CPU
Reference numeral 26 switches the selection switch (SW1) 25 to the H side, that is, the first memory 28 side. The signal read from the first memory 28 selected by the selection switch (SW1) 25 is supplied to the optical pickup 23, so that the data is read from the first memory 28 at the timing when the time t is 0. Start to be served. At this time, if the speed at which the optical pickup 23 reads the signal from the multilayer disc 21 is 10 Mbps and the speed at which the decoder 29 and the decoder 31 encode the signal is 3 Mbps on average, the first memory 28 has the encoder 29 at 3 bps.
Since the data is written at 10 Mbps and the data is read at 10 Mbps, the accumulated data decreases at a speed of about 7 Mbps.

When the amount of data in the first memory 28 becomes empty at time t1, the first memory 28 outputs to the CPU 26 a status signal E1 indicating that it is empty. CPU
In response to this, 26 sends the jump command J2 to the servo means 2
7, the servo means 27 controls the optical pickup 23 to cause a focus jump from the first signal surface of the multilayer disc 21 to the second signal surface. At the same time, the CPU 26 inverts the switch switching signal S. As a result, the optical pickup 23 records a signal on the second signal surface of the multilayer disc 21. This recorded signal is read from the second memory 30 via the selection switch (SW1) 25 switched to the L side. In this case, the last signal read from the second memory 30 by the previous access is searched, and the signal following that signal is searched for in the second memory 3
In order to read from 0, time t1 to time t2
After the search time up to, the signal is read from the second memory 30.

In this search, since a signal is recorded on the multilayer disc 21 with a sector as a minimum unit, a desired signal is searched by using the sector address. At this time, the signal read from the second memory 30 at 10 Mbps is written to the multi-layer disk 21, and the data encoded by the encoder 31 at an average of 3 Mbps is written to the second memory 30.
, The accumulated data decreases at a speed of about 7 Mbps as shown in FIG. Then, when the amount of data accumulated in the second memory 30 becomes empty at time t3, the second memory 30 sends a status signal E2 indicating this empty status to the CPU 26.

In response to this, the CPU 26 outputs a jump command J1 to the servo means 27, and the servo means 27 controls the optical pickup 23 to cause a focus jump from the second signal surface of the multilayer disc 21 to the first signal surface. At the same time, the CPU 26 inverts the switch switching signal S.
As a result, the optical pickup 23 again records a signal on the first signal surface, and this recorded signal is read from the first memory 28 via the selection switch (SW1) 25 switched to the H side. In this case, the search from the time t3 to the time t4 is performed in order to search the last signal read from the first memory 28 by the previous access and read the signal following the signal from the first memory 28. After a lapse of time, the signal is read from the first memory 28.

Such an operation is repeated, signals are alternately recorded on the first signal surface and the first signal surface of the multilayer disc 21 as shown in FIG. 7, and the signal recorded on the first signal surface is the first signal surface. The signal recorded on the second signal surface from the first memory 28 is read from the second memory 30,
The data storage amount changes as shown in the figure. At this time, over the entire period, the signal recorded on the first signal surface is encoded from the encoder 29 and written in the first memory 28, and at the same time, the signal recorded on the second signal surface is encoded from the encoder 31 over the entire period. It is cross-encoded and written in the second memory 30. That is, the encoder 29
The two different image signals and audio signals simultaneously encoded by the encoder 31 and the encoder 31 can be alternately recorded on the respective signal surfaces of the multilayer disc 21.

In this case, the condition for simultaneous recording is that the amount of signal that the optical pickup 23 can record a signal within a unit time is larger than the total amount of signals encoded by the encoder 29 and the encoder 31 within a unit time. It becomes a condition.

Next, the operation of the above-described multi-layer disc recording apparatus of the present invention will be described again with reference to the flow chart shown in FIG. When the recording is instructed in the recording device of the multi-layer disc, this flow chart is started, and after jumping to one layer which is the first signal surface of the multi-layer disc 21 in step S30, the track search to the last portion of the previous recording is performed. Be seen. In this case, immediately after the recording instruction, since there is no previous access, the first part of the signal is searched. Next, in step S32, the selection switch (SW1) 25 is switched to the H side, that is, the first memory 28 side, and the signal read from the first memory 28 is recorded in one layer in step S34.

Next, in step S36, it is determined whether or not the amount of data stored in the first memory 28 is empty.
In this case, if the data storage amount is not empty, "N
If it is determined to be "O", the process returns to step S34, and the signal read from the first memory 28 is recorded in one layer. As a result, if it is determined in step S36 that the data storage amount in the first memory 28 is empty, it is determined to be "YES" and the process proceeds to step S38. Step S3
The determination of 6 is performed every time a sector, which is the minimum unit of recording, is recorded.

In step S38, after the focus jump to the second layer, which is the second signal surface of the multilayer disc 21, the track search to the last data portion of the previous recording is performed. Then, in step S40, the selection switch (SW
1) 25 is switched to the L side, that is, the second memory 30 side, and the signal read from the second memory 30 in step S42 is recorded in the two layers. Then, step S
At 44, it is determined whether or not the amount of data stored in the second memory 30 has become empty.

In this case, if the data storage amount is not empty, it is determined to be "NO", the process returns to step S42, and the signal read from the second memory 30 is recorded in two layers. As a result, when it is determined in step S44 that the amount of data stored in the second memory 30 is empty,
The determination is “YES”, the process returns to step S30, and the processes of steps S30 to S44 are cyclically executed. The determination in step S44 is performed every time a sector, which is the minimum unit of recording, is recorded. In this way, the data is alternately read from the first memory 28 and the second memory 30, and the data is alternately recorded on the first signal surface and the second signal surface of the multilayer disc. The memory to be read is switched when the data storage amount of 30 becomes empty. It should be noted that the state of “the data storage amount is empty” indicates that there is no data to be read, but some data to be read may remain.

Next, FIG. 9 shows the configuration of an embodiment of the disc recording / reproducing apparatus of the present invention which embodies the disc recording / reproducing method of the present invention. The multi-layer disc recording / reproducing apparatus shown in this figure irradiates a multi-layer disc 41 having a two-layer signal surface as shown in FIG. Record the signal on the face. Alternatively, the multilayer disc 41 is irradiated with laser light or the like from the optical pickup 43 via the objective lens 42, and a signal is read from any one of the signal surfaces. The RF signal recorded by the optical pickup 43 is input through the selection switch (SW1) 44, and the RF signal read from the second memory 51 is digital / digital.
The signal is converted into an analog signal that can be recorded by the analog converter (D / A) 52.

The RF signal read from the optical pickup 43 is input to the analog / digital converter (A / D) 47 via the selection switch (SW1) 44,
It is the original digital signal. The signal from the A / D converter 47 is written in the first memory 48. The selection switch (SW1) 44 is switched to the H side so that the read signal is written to the first memory 48 when the optical pickup 43 reads the recording signal from the first signal surface of the multilayer disc 41. And the optical pickup 43
When the recording signal is recorded on the second signal surface of the multi-layer disc 41, the signal read from the second memory 51 by switching to the L side is selected to be recorded on the second signal surface. . The central processing unit (CPU) 45 has state information F1 from the first memory 48 and the second memory 51.
In response to E2, the switch changeover signal S for controlling the selection switch 44 is output and the jump command signal J
1, J2, the focus command signal and the tracking servo command signal are output to the servo means 46.

The servo means 46 receives the focus command signal and the tracking servo command signal from the CPU 45,
Focus servo control and tracking servo control of the optical pickup 43 are performed. In addition, in response to the jump command signals J1 and J2, a focus jump from the first signal surface of the multilayer disc 41 to the second signal surface or a focus jump from the second signal surface of the multilayer disc 41 to the first signal surface is performed. . A signal is read from the first memory 48 over the entire period, and the read signal is decoded by a decoder 49 to continuously output a video (VIDEO 1) signal and an audio (AUDIO 1) signal. It is being output. Further, a video (VIDEO 2) signal and an audio (AUDIO 2) signal are encoded and written in the second memory 51 by the encoder 50 over the entire period.

The writing speed and the reading speed from the optical pickup 43 to the multi-layer disc 41, that is, the data speed written to the first memory 48 or the data speed read from the second memory 51 is generally 10 Mbps. Data rate read from memory 48 to decoder 49, or encoder 5
The average data rate of data written from 0 to the second memory 51 is 3 Mbps. Then, the first memory 48 outputs a status signal F1 indicating the status to the CPU 45 when the data storage amount becomes full, and the second memory 51
Outputs a status signal E2 indicating the status to the CPU 45 when the data storage amount becomes empty.

The operation of the multi-layer disc recording apparatus of the present invention thus constructed will be described with reference to the operation timing chart shown in FIG. The first memory 4 is shown in FIG.
8 shows the change in the amount of data stored, FIG. 8B shows the change in the amount of data stored in the second memory 51, and FIG. 8C shows the state signal F1 output from the first memory 48.
Status signal E2 and CP output from the second memory 51
The timings of the jump command signals J1 and J2 and the switch switching signal S output by U45 are shown.

In FIG. 10, it is assumed that the optical pickup 43 reads out a signal from the first signal surface of the multi-layer disc 41 at the timing of time t0. In this case, the CPU 45 switches the selection switch (SW1) 44 to the H side. As a result, the signal read from the optical pickup 43 to the first memory 48 is transferred to the selection switch (S
W1) 44 and the A / D converter 47, and the data is written in the first memory 48 at the timing of time t0. At this time, the data speed at which the optical pickup 43 reads the signal from the multilayer disc 41 is set to 10 Mb.
If the data rate at which the decoder 49 decodes the signal is 3 Mbps on average, the first memory 48 has 1
Data is written at 0 bps and at the same time, 3 Mbps
Since the data is read to the decoder 49 at, about 7 Mb
Data is accumulated at a rate of ps.

When the amount of data in the first memory 48 becomes full at time t1, the first memory 48 outputs to the CPU 45 a status signal F1 indicating that it is full. C
In response to this, the PU 45 outputs a jump command J2 to the servo means 46, and the servo means 46 outputs the optical pickup 43.
Is controlled to cause a focus jump from the first signal surface to the second signal surface of the multilayer disc 41. At the same time, the CPU 45
The switch switching signal S is inverted. As a result, the optical pickup 43 records a signal on the second signal surface of the multilayer disc 41. This recorded signal is read from the second memory 51 via the selection switch (SW1) 44 switched to the L side. In this case, the search from the time t1 to the time t2 is performed in order to search the last signal read from the second memory 51 by the previous access and read the signal following the signal from the second memory 51. After a lapse of time, the recording signal comes to be read from the second memory 51.

In this search, since a signal is recorded on the multilayer disc 41 with a sector as a minimum unit, a desired signal is searched by using the sector address. At this time, the signal read out from the second memory 51 at 10 Mbps is written in the multi-layer disc 41, and the encoder 50 writes the data encoded at 3 Mbps on average in the second memory 51 for the entire period. The accumulated data decreases at a speed of about 7 Mbps, as shown in FIG. When the amount of data accumulated in the second memory 51 becomes empty at time t3, the second memory 51 sends a status signal E2 indicating this empty status to the CPU 4
Send to 5.

In response to this, the CPU 45 outputs a jump command J1 to the servo means 46, and the servo means 46 controls the optical pickup 43 to cause a focus jump from the second signal surface of the multilayer disc 41 to the first signal surface. At the same time, the CPU 45 inverts the switch switching signal S.
As a result, the optical pickup 43 again reads the signal from the first signal surface, and the read signal is H level.
It is written in the first memory 48 via the selection switch (SW1) 44 switched to the side. In this case, the last signal written in the first memory 48 by the previous access is searched for, and the subsequent signal is searched for in the first memory 48.
In order to write to the first memory 48, the signal read after the search time from time t3 to time t4
Will be written to.

Such an operation is repeated, and FIG.
As shown in, the operation of reading a signal from the first signal surface of the multilayer disc 41 and the operation of recording a signal on the second signal surface are alternately performed. In this case, the signal read out from the first memory 48 over the entire period is decoded by the decoder 49 to continuously output the video signal and the audio signal, and the encoder 50 continuously encodes the video signal and the audio signal. Is the second memory 51 for the entire period
Is written to. That is, reading and recording can be performed on the multilayer disc 41 at the same time.

The conditions for simultaneous recording and reproduction in this case are as follows.
The condition is that the amount of signals that the optical pickup 43 can record / reproduce in a unit time is larger than the total amount of signals decoded or encoded in the unit time by the decoder 49 and the encoder 50.

Next, the operation of the above-described multilayer disc recording / reproducing apparatus of the present invention will be described again with reference to the flow chart shown in FIG. When recording / reproducing is instructed in the recording / reproducing apparatus for the multi-layer disc, this flow chart is started, and the multi-layer disc 41 is started in step S50.
After jumping to the first layer, which is the first signal surface, the track search is performed to the last part of the previous reproduction. In this case, immediately after the recording / reproducing instruction, since there is no previous access, the first part of the signal is searched. Next, in step S52, the selection switch (SW1) 44 is switched to the H side, that is, the first memory 48 side, and the signal read from the first layer is written in the first memory 28 in step S54.

Next, in step S56, it is determined whether or not the amount of data stored in the first memory 48 is full. In this case, when the data storage amount is not full, it is determined to be "NO", the process returns to step S54, and the signal read from the first layer is written in the first memory 48. As a result, when it is determined in step S56 that the data storage amount of the first memory 48 is full,
It is determined to be "YES" and the process proceeds to step S58. In addition,
The determination in step S56 is made every time a sector, which is the minimum unit of recording, is recorded.

In step S58, after the focus jump to the second layer, which is the second signal surface of the multi-layer disc 41, the track search to the last data portion of the previous recording is performed. Then, in step S60, the selection switch (SW
1) 44 is switched to the L side, that is, the second memory 51 side, and the signal read from the second memory 51 in step S62 is recorded in the two layers. Then, step S
At 64, it is determined whether or not the amount of data stored in the second memory 51 has become empty.

In this case, if the data storage amount is not empty, a "NO" determination is made, the flow returns to step S62, and the signal read from the second memory 51 is recorded in two layers. As a result, when it is determined in step S64 that the amount of data stored in the second memory 51 is empty,
The determination is “YES”, the process returns to step S50, and the processes of steps S50 to S64 are cyclically executed. The determination in step S64 is performed every time the sector, which is the minimum unit of recording, is recorded.

As described above, writing to the first memory 48 and reading from the second memory 51 are alternately performed so that the signal is read from the first signal surface of the multilayer disc 41 and the second signal surface is read. The signal is recorded. Switching between reading and recording on the multilayer disc 41 is
The switching is performed when the amount of data stored in the first memory 48 becomes full and when the amount of data stored in the second memory 51 becomes empty. It should be noted that the "data storage amount is full" state means that there is no free space as described above, and the "data storage amount is empty" state is that there is no data to be read, as described above. The state that remains.

In the above description, the two-layer multi-layer disc is described in detail, but the three-layer multi-layer disc can also be recorded / reproduced simultaneously. In this case, the speed at which the optical pickup reproduces the signal from the multilayer disc and the speed at which the signal is recorded are faster than the sum of the speed at which the decoder reads the signal from the memory and the speed at which the encoder writes to the memory.

[0061]

Since the present invention is configured as described above, it is possible to simultaneously read out signals recorded in a plurality of layers from a multi-layer disc and simultaneously reproduce the signals.
In addition, the present invention can simultaneously record a plurality of continuously encoded signals on a plurality of layers of a multi-layer disc. Further, according to the present invention, a plurality of signals which are continuously encoded can be recorded on a multi-layer disc, and at the same time, the recorded signals can be read and continuously reproduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a disc reproducing apparatus of the present invention and a diagram showing a schematic configuration of a multilayer disc.

FIG. 2 is a diagram showing a memory storage amount and an operation timing of the disc reproducing apparatus of the present invention.

FIG. 3 is a flowchart showing an operation of the disc reproducing apparatus of the present invention.

FIG. 4 is a diagram showing a configuration of a modified example of the embodiment of the disc reproducing apparatus of the present invention.

FIG. 5 is a diagram showing the configuration of another modification of the embodiment of the disc reproducing apparatus of the present invention.

FIG. 6 is a diagram showing a configuration of an embodiment of a disc recording apparatus of the present invention.

FIG. 7 is a diagram showing a memory storage amount and an operation timing of the disk recording device of the present invention.

FIG. 8 is a flowchart showing the operation of the disc recording apparatus of the present invention.

FIG. 9 is a diagram showing a configuration of an embodiment of a disc recording / reproducing apparatus of the present invention.

FIG. 10 is a diagram showing a memory storage amount and operation timing of the disc recording / reproducing apparatus of the present invention.

FIG. 11 is a flowchart showing the operation of the disc recording / reproducing apparatus of the present invention.

[Explanation of symbols]

 1,21,41 Disc 2,22 42 Objective lens 3,23,43 Optical pickup 4,47 A / D converter 5,25,44 Selection switch (SW1) 6,26,45 CPU 7,27,46 Servo means 8, 10, 12, 28, 30, 48, 51 Memory 9, 11, 13, 49 Decoder 24, 52 D / A converter 29, 31, 50 Encoder

Claims (6)

[Claims] 1. When a signal of a plurality of layers is simultaneously reproduced from a multi-layer disc having a signal surface of two or more layers, a plurality of memories for accumulating the signals read from the layers of the plurality of layers are provided, and the plurality of memories are provided. The signals read from the respective layers are sequentially accumulated in each of the memories in a time-division manner until the amount of accumulated data in the memory becomes full, and when the signals become full, the next signal of the signals read from the next layer is accumulated. Accumulation of the signal read from the last layer to the first memory when the accumulation of the signal to the memory is started and the data accumulation amount of the final memory becomes full In order to restart the process, the process of accumulating the signals read from each of the plurality of layers in the plurality of memories is cyclically performed, and the signals are read from the plurality of memories for the entire period. Play at the same time Multi-layer disc reproducing method which is characterized in that. 2. When simultaneously recording signals of a plurality of layers on a multi-layer disc having a signal surface of two or more layers, a plurality of memories for accumulating signals to be recorded in each layer of the plurality of layers are provided, and the plurality of memories are provided. The signals to be recorded in the respective layers are sequentially read out in a time division manner, and when the amount of data stored in the memory becomes empty, the process of reading the signals to be recorded in the next layer from the next memory is started, and the final When the signal is read from the final memory that stores the signal to be recorded in the layer and the data storage amount becomes empty, the process of reading the signal to be recorded in the first layer from the first memory is restarted. As described above, the process of reading the signals recorded in each of the plurality of layers from the plurality of memories is cyclically performed, and the encode signals are written in the plurality of memories for the entire period. Multi-layer disc recording method characterized in that it is recorded in. 3. A first memory for accumulating signals read from predetermined layers of the plurality of layers when simultaneously recording and reproducing the signals of the plurality of layers on a multi-layer disc having two or more signal surfaces. A second memory for accumulating a signal to be recorded in each of the predetermined layers of the plurality of layers is provided, and the first memory has one or more memory areas, and each memory area is sequentially time-divided from each of the layers. The read signal is accumulated until the amount of accumulated data in that memory area becomes full, and when it becomes full, the accumulation of the signal read from the next layer in the next memory area is started, and When the data storage amount of the final memory area for accumulating the signal read from the layer becomes full, the memory areas of the second memory having the one or more memory areas are sequentially time-divisionally described from the respective memory areas. The signal to be recorded on each layer Is Desa see, when the amount of data stored in the memory area becomes empty,
The process of reading the signal to be recorded on the next layer from the next memory area is started, the signal is read from the last memory area that is accumulating the signal to be recorded on the last layer, and the data storage amount becomes empty. One or more layers of the plurality of layers in the first memory such that the storage of the signal read from the first layer in the first memory area of the first memory is restarted when The process of accumulating the signal read from the first memory and the process of reading the signal recorded in the one or more layers of the plurality of layers from the second memory are cyclically performed, and the entire period is read from the first memory. A multi-layer disc recording / reproducing method characterized in that a signal is read out and reproduced over a period of time, an encode signal is written in the second memory over a whole period, and recorded and reproduced simultaneously. 4. A multi-layer disc having a signal surface of two or more layers, a pickup for reading a signal from any layer of the multi-layer disc, and a plurality of memories for accumulating the signals of the respective layers read by the pickup. And a plurality of decoders for respectively reproducing signals read from the plurality of memories, and a controller for performing read control of the pickup and write / read control of the plurality of memories. The signals read by the pickup from each of the plurality of layers are sequentially written in a time-divisional manner in each of the plurality of memories, and when the accumulated data amount of the memories becomes full, the signals are read from the next layer. Accumulation of signals in the next memory starts and accumulates signals read from the last layer Writing signals read from each layer of the plurality of layers to the plurality of memories such that when the amount is full, the writing of the signal read from the first layer to the first memory is restarted. The controller controls the processing to be performed cyclically, and further controls the signal to be read from the plurality of memories for the entire period so that the read signals are simultaneously reproduced by the plurality of decoders. A multi-layer disc reproducing device characterized in that it is controlled so as to be controlled. 5. A multi-layer disc having a signal surface of two or more layers, a pickup for recording a signal on any layer of the multi-layer disc, and a plurality of memories storing signals recorded on each layer by the pickup. And a plurality of encoders that respectively encode signals stored in the plurality of memories, and a controller that performs recording control of the pickup and writing / reading control of the plurality of memories. The signals to be recorded in the respective layers are sequentially read in a time-divisional manner from the above, and when the amount of data stored in the memory becomes empty, the process of reading the signals to be recorded in the next layer from the next memory is started, and the final layer When the signal is read from the final memory that stores the signal to be recorded to, and the data storage amount becomes empty,
Control is performed such that the process of reading the signals recorded in each layer of the plurality of layers from the plurality of memories is cycled so that the process of reading the signal to be recorded in the first layer from the first memory is restarted, and The multi-layer disc recording apparatus, wherein the controller controls the plurality of memories so that the encode signals from the plurality of encoders are written and simultaneously recorded over the entire period. 6. A multi-layer disc having a signal surface of two or more layers, a pickup for reproducing a signal from any layer of the multi-layer disc and recording the signal on any layer of the multi-layer disc, and the pickup. A first memory having one or more memory areas in which signals reproduced by the pickup are written, a second memory having one or more memory areas in which signals recorded by the pickup are stored, Decoder for reproducing the signal read from the first memory, encoder for encoding the signal stored in the second memory, recording / reproduction control of the pickup, and writing to the first memory and the second memory / A controller for performing read control, wherein the controller is arranged in each of the memory areas of the first memory in a time-divisionally sequential manner in each of the layers. Write the read signal until the amount of accumulated data in that memory area is full, and when it is full, start writing the signal read from the next layer to the next memory area, and then When the data storage amount in the final memory area for writing the signal read from is full, signals to be recorded in the respective layers are sequentially read from the respective memory areas of the second memory in a time division manner, When the amount of accumulated data in that memory area becomes empty, the process of reading the signal to be recorded in the next layer from the next memory area is started, and the final memory area in which the signal to be recorded in the last layer is accumulated. So that when the signal is read from the first memory area and the data storage amount becomes empty, the signal read from the first layer is restarted to be stored in the first memory area of the first memory, The first A process of accumulating signals read from one or more layers of the plurality of layers in the memory and a process of reading signals recorded in one or more layers of the plurality of layers from the second memory are circulated. Further, the controller reads the signal from the first memory for the entire period, reproduces it by the decoder, writes the encode signal from the encoder to the second memory for the entire period. A multi-layer disc recording / reproducing apparatus characterized by controlling so as to record / reproduce at the same time.