JPH0944976A - Disk drive device and disk drive method - Google Patents

Abstract

(57) [Abstract] [Problem] To enable accurate and quick access. SOLUTION: From a video CD control unit 8 via a system control unit 11, a CD mechanical control unit 3
Then, a reproduction command is transmitted together with a predetermined address, whereby the CD drive unit 2 starts reproduction of the video CD 1. The reproduction data is supplied to the MPEG circuit unit 4 via the CD mechanical control unit 3, and the MPEG circuit unit 4
Then, the address included in the reproduction data is supplied to the video CD control unit 8. The video CD control unit 8 calculates a difference value between the address from the MPEG circuit unit 4 and the predetermined address transmitted together with the reproduction command as a correction value. After that, when transmitting the address together with the reproduction command, the video CD control unit 8 corrects the address with the correction value and then transmits.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device and a disk drive method. In particular, the present invention relates to a disk drive device and a disk drive method capable of quickly accessing a disk-shaped recording medium such as a video compact disk.

[0002]

2. Description of the Related Art In recent years, a video compact disc (hereinafter, referred to as a video C as needed) capable of recording images and sounds.
D) has been put to practical use. On a video CD, images and audio are recorded in MPEG (Moving Picture Expert Group).
It is encoded and recorded according to p).

Further, in the version 2.0 video CD, in addition to material data such as images and sounds, playback control data (PBC (playback control) data) for designating a playback procedure for playing back the material data is also included. It is possible to record the data, which allows not only sequential reproduction of the material data but also interactive reproduction.

Video C for reproducing such a video CD
In the D reproducing apparatus, the video CD is reproduced as follows. That is, the TOC (Table Of Contents: list data of the start address and end address of each track in the CD, the type information of the CD, the total number of tracks, etc.) of the video CD is read, and the TOC is read. From the described subcode Q, the address on the video CD where the data to be reproduced is recorded is recognized. Then, the servo system is controlled to seek and access the address, and the data is reproduced.

[0005]

By the way, video CDs
According to the standard, as shown in FIG. 10, it is necessary to allow the sector sync to shift from the subcode sync in the range of −15 to +12 frames. For this reason,
When the data (bitstream data) reproduced as described above is viewed in frame units of the CD-ROM-XA format, the frame address at which reproduction actually starts is the frame address described in the subcode Q. On the other hand, it may be shifted in the range of −15 to +12 frames.

Further, considering that the frame address at which reproduction is actually started is deviated by several frames due to the precision of the mechanical servo, the deviation as a whole is about ± 20 frames. There will be a gap).

Therefore, in the conventional video CD reproducing apparatus, from the frame address described in the subcode Q,
Data reproduction is started from an address several tens of frames before. Therefore, there is a problem that it takes time to access a position away from the frame address where the target data is recorded and to start reproducing the target data.

Further, in this case, the data recorded in the frame preceding the target data may be reproduced.

The present invention has been made in view of such a situation, and makes it possible to quickly access a target position on a disk.

[0010]

DISCLOSURE OF THE INVENTION A disk drive device of the present invention is configured to reproduce data from a disk-shaped recording medium, and to transmit a predetermined address to the reproduction means to reproduce data from the predetermined address. And a calculating means for calculating a predetermined correction value based on an address and a predetermined address included in the data output from the reproducing means, the control means based on the predetermined correction value. It is characterized in that the corrected predetermined address is transmitted to the reproducing means.

In this disk drive device, the calculation means can calculate a predetermined correction value every time the disk-shaped recording medium is mounted.

The disk drive method of the present invention reproduces data from a predetermined address of the disk-shaped recording medium, and based on the address included in the data and the predetermined address,
When a predetermined correction value is calculated and then an instruction is given to reproduce data from a predetermined address of the disc-shaped recording medium, the predetermined address of the disc-shaped recording medium is corrected based on the predetermined correction value. Characterized by reproducing data.

In the disk drive device of the present invention, the reproducing means reproduces the data from the disk-shaped recording medium, and the control means transmits the predetermined address to the reproducing means and reproduces the data from the predetermined address. The calculating means calculates the predetermined correction value based on the address and the predetermined address included in the data output from the reproducing means. In this case, the control means is adapted to transmit the predetermined address corrected based on the predetermined correction value to the reproducing means.

In the disk drive method of the present invention, data is reproduced from a predetermined address of the disk-shaped recording medium, a predetermined correction value is calculated based on the address included in the data and the predetermined address, and then the disk is read. When there is an instruction to reproduce data from a predetermined address of the disk-shaped recording medium, the data is reproduced from a predetermined address of the disk-shaped recording medium corrected based on a predetermined correction value.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below, but before that, in order to clarify the correspondence between each means of the invention described in the claims and the following embodiments. The features of the present invention are described as follows by adding a corresponding embodiment (however, an example) in parentheses after each means.

That is, a disk drive device according to a first aspect of the present invention is a disk drive device for driving a disk-shaped recording medium, and reproducing means for reproducing data from the disk-shaped recording medium (for example, the CD drive shown in FIG. 1). A control means (for example, the video CD control shown in FIG. 1) for transmitting a predetermined address to the section 2 and the CD mechanical controller (mechanical controller) section 3 and the reproduction means and controlling the reproduction of the data from the predetermined address. Section 8 and system control section 11) and a calculating means for calculating a predetermined correction value based on an address and a predetermined address included in the data output from the reproducing means (for example, processing steps of the program shown in FIG. 8). S64, etc.),
The control means transmits the predetermined address corrected based on the predetermined correction value to the reproducing means.

Of course, this description does not mean that each means is limited to the above.

FIG. 1 shows the configuration of an embodiment of a video CD reproducing apparatus to which the present invention is applied. Video CD1
For example, in a version 2.0 video CD, material control data such as image data and audio data as well as playback control data are recorded therein. CD drive unit 2
Is a spindle motor that drives the video CD1 to rotate,
It has an optical pickup for irradiating the video CD 1 with light and receiving the reflected light, and reproduces the data recorded in the video CD 1 in accordance with a command from the CD mechanical control unit 3, and the CD mechanical control unit 3 It is designed to output to.

The CD mechanical control unit 3 controls the CD drive unit 2 in accordance with a command (for example, a play / stop command, etc.) transmitted from the video CD control unit 8 via the system control unit 11, and at the same time, the CD The data supplied from the drive unit 2 is supplied to the MPEG circuit unit 4 or the system control unit 11.
That is, the CD mechanical control unit 3 is, for example, from the video CD control unit 8 via the system control unit 11,
When a playback command from a predetermined frame address is received,
By servoing the CD drive unit 2, the predetermined frame address is accessed. Then, the bit stream output from the CD drive unit 2 is output to the MPEG circuit unit 4 or the system control unit 11.

The MPEG circuit unit 4 uses the MPEG (MPEG
1) It has an IC for decoding encoded data (IC for MPEG decoding) and others. Then, the MPEG circuit section 4 is controlled by the video CD control section 8 and C
The data from the D mechanical control unit 3 is MPEG-decoded, and the resulting video data or audio data is
The data is output to the NTSC converter 6 or the D / A converter 7, respectively. In addition, the MPEG circuit unit 4
By using the function of reading the CD-ROM-XA data of the MPEG decoding IC, the data (playback control data) recorded at a predetermined position on the video CD is extracted from the data supplied from the CD mechanical control unit 3. take out,
It is also designed to be supplied to a DRAM (dynamic RAM) 5 for storage. The DRAM 5 is data (playback control data) supplied from the MPEG circuit unit 4.
It is designed to remember.

The NTSC conversion section 6 converts the video data supplied from the MPEG circuit section 4 into an image signal conforming to the NTSC system and supplies it to a monitor (not shown) for display. The D / A converter 7 is adapted to D / A convert the audio data supplied from the MPEG circuit unit 4 and supply it to a speaker (not shown) for output.

The video CD control unit 8 is controlled by the system control unit 11 and mainly performs playback control based on playback control data. In addition, from the system control unit 11 to the video CD control unit 8, numerals 1 to 9, NEXT key for playback control, PREV
A 1-byte code to which an IOUS key, a RETURN key, a default key, etc. are assigned is supplied as a control command. Also a video CD
The control unit 8 is configured to read the playback control data from the DRAM 5 by transmitting a read command to the MPEG circuit 4, transfer this to the SRAM 9, and store it in the SRAM 9. Playback control is performed based on the playback control data.

The SRAM (static RAM) 9 is a D
Playback control data supplied from the RAM 5 via the MPEG circuit section 4 and the video CD control section 8 is stored.

The above-mentioned CD drive section 2 to SRAM 9 are blocks for reproducing the video CD 1 (hereinafter referred to as video C as appropriate).
(Referred to as D block).

The system control unit 11 uses the video C
In addition to the D block, the states of the VTR block 13 and the tuner block 14 are monitored and controlled.
Further, the system control unit 11 receives a signal from the remote controller (remote commander) 12, and sends a control command corresponding to the received signal to the video control unit 8, V
The output is also made to the TR block 13 and the tuner block 14.

The remote controller 12 has a number key and a reproduction key (P
LAY key), NEXT key, PREVIOUS key,
It has a RETURN key, a default key, etc., and is operated when the video CD reproducing device is caused to perform a predetermined process.
An operation signal corresponding to the operation is transmitted to the system control unit 11.

The VTR block 13 is designed to record and reproduce data on a video tape (not shown) under the control of the system control unit 11, and the tuner block 14 is controlled under the control of the system control unit 11. , Receives and demodulates television broadcast signals. The speaker 15 is configured to output sound under the control of the system control unit 11. Therefore, in this video CD reproducing apparatus, the video CD
In addition to the reproduction of 1, the recording / reproduction of a video tape and the reception of a television broadcast can be performed.

Next, the operation will be described. When the video CD 1 is inserted (mounted) in the device, the video CD 1 is transferred from the system control unit 11 via the control signal line.
Information indicating that 1 has been inserted is transmitted to the video CD control unit 8. The video CD control unit 8
When this information is received, a TOC information request command is sent to the system control unit 11, and the system control unit 11 that received this command sends the CD
The drive unit 2 is track-jumped to the innermost circumference of the video CD 1. As a result, the data recorded on the video CD is reproduced, and the CD mechanism controller 3 is reproduced via the CD driver 2.
Is supplied to. In the CD mechanical control unit 3, TOC information is detected from the reproduced data, and the system control unit 1
It is supplied to the video CD control unit 8 via 1. After receiving the TOC information, the video CD control unit 8 stores it in the SRAM 9.

After that, the video CD control unit 8
A playback command is transmitted from the address (00:04:00 (minute: second: frame)) where the playback control data is recorded to the CD mechanical control unit 3 via the system control unit 11. Upon receiving the reproduction command, the CD mechanical control unit 3 controls the CD driving unit 2 to reproduce the video CD 1 from the address where the playback control data is recorded. The reproduced data obtained as a result is supplied to the MPEG circuit section 4 via the CD drive section 2 and the CD mechanical controller section 3. The MPEG circuit unit 4 uses the data capture function of the built-in MPEG decoding IC to extract the playback control data from the data input to the DRA
Transfer to M5 for storage.

When the playback control data is stored in the DRAM 5, the video CD control unit 8 reads the playback control data via the MPEG circuit unit 4 and transfers it to the SRAM 9 for storage.

Then, the video CD control section 8 is
Interpret the playback control data stored in SRAM 9 and execute the play item in the first list. As a result, a playback command from the address designated by the play item number is sent from the video CD control unit 8 to
It is transmitted to the CD mechanical control unit 3 via the system control unit 11, and the CD mechanical control unit 3 controls the CD drive unit 2 in accordance with the reproduction command. In the CD drive section 2, reproduction from a predetermined address of the video CD 1 is performed under the control of the CD mechanical control section 3, and the reproduced data obtained as a result passes through the CD mechanical control section 3 to the MPEG circuit section 4 Is supplied to. MPEG circuit unit 4
Then, the input data is MPEG-decoded, and the decoded data is supplied to the monitor via the NTSC converter 6 or to the speaker via the D / A converter 7. Thereby, for example, the first menu screen is presented.

Next, FIG. 2 shows an example of the structure of the video CD control unit 8 of FIG. The video CD core processing unit 21 receives instructions from the key input processing unit 27 and SRAM.
9 based on the playback control data supplied from the memory control unit 28 via the memory control unit 28, and performs MPE via the MPEG control data communication unit 22.
The G circuit unit 4 is controlled.

That is, the video CD core processing section 21 reads the playback control data specified by the key input processing by the key input processing section 27 from the SRAM 9 by controlling the memory control section 28. Then, based on the playback control data, a predetermined command
It is transmitted to the MPEG circuit unit 4 via the PEG control data communication unit 22, and a play / stop command is sent to the mechanical controller I / M.
The data is transmitted to the CD mechanical control unit 3 via the F (interface) 26, the receiving unit 25, and the system control unit 11. When the reproduction command is transmitted, the address of the video CD 1 at which reproduction is started is specified.
This address is specified in minutes, seconds, and frames.

Furthermore, the video CD core processing unit 21
The SD processing unit 24 and the memory control unit 28 are also controlled.

The MPEG control data communication section 22 controls the communication between the video CD core processing section 21 and the MPEG circuit section 4. The initialization processing unit 23 controls the video CD core processing unit 2 when the device is powered on.
1 is initialized. The OSD (on-screen display) processing unit 24 is controlled by the video CD core processing unit 21, and OSD data (RGB data).
Is designed to generate. Although not shown in FIG. 1, the OSD data may be sent to the NT if necessary.
It is supplied to the SC conversion unit 6 (FIG. 1), where it is superimposed on the video data from the MPEG circuit unit 4.

The receiving unit 25 operates by operating a predetermined key of the remote controller 12 (FIG. 1), and supplies a signal corresponding to the operated key (hereinafter referred to as a key as appropriate) supplied from the system control unit 11. It receives data) and stores it in its built-in buffer. Further, the receiving unit 25 is also configured to receive data (hereinafter, appropriately referred to as mechanical control data) exchanged between the CD mechanical control unit 3 and the video CD control unit 8 via the system control unit 11. ing. The key data is output to the key input processing unit 27, and the mechanical control data is output to the system control unit 11 or the CD mechanical control I / F 26.

The CD-to-CD mechacon I / F 26 is a video CD.
The mechanical control data output from the core processing unit 21 is received and output to the CD mechanical control unit 3 via the receiving unit 25 and the system control unit 11, and from the CD mechanical control unit 3 to the system control unit 11 and the receiving unit 2.
The mechanical control data supplied via 5 is output to the video CD core processing unit 21.

The key input processing section 27 receives the key data from the receiving section 25 and analyzes it to determine the key input processing to be performed. further,
The key input processing unit 27 is also configured to instruct the video CD core processing unit 21 to perform the key input processing after determining the key input processing to be performed. For the key input processing as playback control, for example, PRE
VIOUS key processing, RETURN key processing, NEXT
There are key processing, DEFULT key processing, number key processing, and the like. Also, for key input processing that is not directly related to the playback processing specifications of the video CD version 2.0,
Skip processing (high-speed playback processing), one-step processing, slow motion processing, reverse skip processing (high-speed reverse playback), playback processing from a specific list, video playback processing from a specific track, playback processing from a specific entry point and so on.

The memory control unit 28 is controlled by the video CD core processing unit 21 and controls reading and writing of playback control data with respect to the SRAM 9.

Next, the flow chart of FIG. 3 shows the main routine executed by the video CD control section 8 of FIG. First, in step S1, the key input processing unit 27
At, the presence / absence of a user key input is checked. That is,
When the user operates the remote controller 12, an operation signal (key data) corresponding to the operation is received by the reception unit 25 via the system control unit 11 and the control line and stored in the built-in reception buffer. . The key input processing unit 27 refers to the reception buffer of the reception unit 25 to check the presence / absence of user key input.

When there is a key input (by the user,
When the remote controller 12 is operated), the key input processing unit 27
Then, the key input process to be performed is confirmed, and information on the confirmed key input process (hereinafter, appropriately referred to as key input process information) is output to the video CD core processing unit 21. Upon receiving the key input processing information, the video CD core processing section 21 sends a control command corresponding to the key input processing information to the MPE via the MPEG control data communication section 22.
It is transmitted to the G circuit unit 4 and also to the CD mechanical controller I / F
26, receiver 25, and system controller 11
To the CD mechanical control unit 3 via.

After that, the MPEG circuit section 4 outputs a video CD.
An interrupt is issued to the control unit 8, and this interrupt is accompanied by predetermined interrupt processing data and MPE.
When received by the video CD core processing unit 21 via the G control data communication unit 22, the video CD core processing unit 21 analyzes the interrupt processing data in step S2 to perform a predetermined interrupt processing. . And
The command corresponding to the result of the interrupt processing (for example,
The play / stop command, etc.) is transmitted to the MPEG circuit section 4 and the CD mechanical controller section 3 in the same manner as described above.

After the above processing, from the CD mechanical control unit 3,
Since status information such as a message indicating that the video CD 1 is inserted is transmitted via the system control unit 11, the status information is sent to the receiving unit 25 and the CD mechanical interface I / F 2 for CD in step S3.
6 is received by the video CD core processing unit 21 via 6,
It is processed.

Thereafter, the process returns to step S1 and the above-mentioned processing is repeated.

The interrupt accepted by the video CD core processing unit 21 is the MPE in step S2 described above.
In addition to the interrupt from the G circuit unit 4, there is a timer interrupt, and this timer interrupt controls the waiting time that can be defined by the playback control data.

Next, the playback control procedure based on the playback control data will be described with reference to FIG.
First, in step S11, the playback control data is stored in the SRAM 9 as described above. The playback control data stored in the SRAM 9 may be, for example, INFO. VCD file, EN
TRY. VCD file, LOT. VCD file, P
SD. There are VCD files and the like. Among the above files, INFO. VCD file and ENTR
Y. The VCD file is read only once before playback control is started.

Here, the INFO. VCD files include
Described are the standard name of the video CD, the version and the album ID for volume management, the number of disks constituting the volume, the disk number, and the like. ENT
RY. Time information for starting sequence reproduction, that is, entry information is described in the VCD file. PS
D. The VCD file describes a play list for performing playback control and a selection list. LOT. PSD.VCD file has PSD. The position of the play list and selection list described in the VCD file is described.

Then, in step S12, the video CD control unit 8 causes the PS stored in the SRAM 9 to
D. VCD file playlist (Play Lis
With reference to t), the start and end addresses of the play item are calculated. In addition, the video CD control unit 8 specifies a reproduction mode (still image mode / moving image mode, etc.) and sends a command to the MPEG circuit unit 4 together with the start and end addresses of the play item and the reproduction mode.

Further, the video CD control section 8 is
In step S13, the system control unit 11
A CD reproduction start command is transmitted to the CD mechanical control unit 3 via the. After that, in step S14, the video CD control unit 8 checks the presence / absence of the user's key input, and if there is the key input, the key input processing corresponding to the key input is performed.
Then, when the MPEG circuit unit 4 interrupts the video CD control unit 8, the video CD control unit 8 analyzes the interrupt processing data transmitted together with the interrupt in step S15, and the analysis result is obtained. Based on this, a predetermined command is transmitted to the MPEG circuit section 4 and the CD mechanical controller section 3.

According to the above processing, INFO. VCD
When the PSD size in (1 sector from 00:04:00) is 0, the playback control data is not recorded in the video CD1, and therefore the reproduction is started from the track 2 (condition: video CD1). If it is not the previous disk and continue processing).

In addition, INFO. When the PSD size in the VCD is not 0, the process starts from LIST ID # 1 (condition: when the video CD1 is not the continuous process with the previous disc). Specifically, PSD. The first 1 sector (2048 bytes) in the VCD file (starting from 00:04:34) is read and the selection list (header data = 18H) or playlist (header data = 10H) of the first part of the data is read. Is executed.

When the video CD 1 is a continuous process with the previous disc, the following process is performed. That is, P
When the SD size is not 0, the INFO. VCD
Album ID (byte position)
11-26) is the same as the previous disc,
et sequence No. (Byte posi
29-30) is 2 or more, and the INFO. Status fla in VCD
When bit5 of g (byte position 44) is 1, the reproduction processing of the video CD 1 is performed by the LIS.
Starting from T ID # 2.

When the PSD size is 0,
INFO. AlbumID (byte po in VCD
The position 11-26) is the same as the previous disc,
Album set sequence No. (By
te position 29-30) is 2 or more,
In addition, the INFO. Stat in VCD
us flag (byte position 44)
When the bit 6 is 1, the reproduction process of the video CD 1 is started from the track 3.

Next, with reference to FIG. 5 to FIG. 7, a processing procedure of playback control after the play item is executed will be described. First, when the first play item of the playback control data is reproduced in step S21 of FIG. 5, the user operates the remote controller 12 in step S22.
There is a waiting time until there is a key input by operating, and if there is a key input, the process proceeds to step S23, and a playback control process corresponding to the key input is performed.
Specifically, the playlist or selection list corresponding to the key input is executed.

The flowchart of FIG. 6 shows a processing procedure when a playlist is executed. When the play list is executed, the video CD control unit 8 determines in steps S31 to S34 whether the pre-ski key, the next key, the stop key, or the auto pause key is operated. When any key is operated, the process corresponding to the key input corresponding to the operated key is read from the playlist,
This is executed in each of steps S35 to S38. Then, if there is no key input, it is determined in step S39, the process proceeds to step S40, and the playlist Nex
t List is executed.

Specifically, for example, PSD. First list of VCD: Video CD, if playlist is executed
The control unit 8 performs the following processing. That is, first, the binary data (word) of the area in which the list ID number is stored is read from the SRAM 9, and the values of bit0 to bit14 of the binary data are checked as the list ID number. As a result, if it is confirmed that the list ID number is 0001,
Play Item # 1 Number is executed (when MSB = 1, it is not registered in the table data of the LOT.VCD file).

After the Play Item # 1 is executed, the key input from the user [NEXT, RETURN,
[PREVIOUS] and there is a need to move to a new list processing according to the key input, Play
When the numeric data (binary 2 bytes) in the Item # 1 area is 0 or 1, no particular processing is performed. When the numeric data is any value of 2 to 99, the track number is set. Playback from.

That is, first, INFO. Size in VCD
Map of TRACK Motion Pict
ure information (byte position 31-4
The reproduction mode of the MPEG circuit unit 4 is set based on the NTSC / PAL information of each track specified in 3).
It is set by the Stream command. Next, the start address (address) and the end address of the reproduction target track are calculated from the TOC information, and a moving image reproduction macro command (Play (start address, end address) command) is transmitted to the MPEG circuit unit 4. Furthermore, for the CD mechanical control unit 3,
A Play (start address) command is transmitted.

When the CD mechanical control unit 3 receives the start address together with the Play command from the video CD control unit 8, the video C control unit 3 receives the video C corresponding to the start address.
CD based on subcode Q of TOC information in D1
Servo control of the drive unit 2 is performed, thereby causing the CD drive unit 2 to reproduce the data from the start address transmitted together with the Play command. The playback data is
MPE from the CD drive unit 2 via the CD mechanical control unit 3
It is supplied to the G circuit unit 4 and is output from the monitor or the speaker as described above.

After that, when the address included in the data supplied from the CD drive section 2 to the MPEG circuit section 4 via the mechanical control section 3 exceeds the above-mentioned end address, the MPEG circuit section 4 causes the video CD control section 8 to operate. In response, an end address interrupt is generated. Upon receiving the end address interrupt from the MPEG circuit unit 4, the video CD control unit 8 sends a stop command to the CD mechanical control unit 3. As a result, the reproduction of the video CD 1 is stopped.

On the other hand, when the numeric data in the Play Item # 1 area is any value from 100 to 599, 99 is subtracted from the numeric value, and ENTRY. VC
From the ENTRY point described in D to the end of the track is played. Specifically, INFO. VCD
In Size Map of TRACK Motio
N of each track specified by n Picture information
The playback mode of the MPEG circuit unit 4 is set by the Set Stream command based on the TSC / PAL information.
In addition, ENTRY. The start address and end address of the playback image track are calculated from the VCD and TOC information, and the MPE
For the G circuit unit 4, a movie playback macro command (Play
(Start address, end address) command) and a Play (start address) command are sent to the CD mechanical control unit 3.

As a result, reproduction is started from the start address (start address) of the video CD 1. After that, when the reproduction up to the end address is performed, the end address interrupt is generated in the MPEG circuit unit 4 as described above, and thus the reproduction of the video CD 1 is stopped.

If the numeric data in the Play Item # 1 area is any value from 1000 to 2979, the segment play item having a value obtained by subtracting 999 from that value is reproduced. When executing a segment play item, INFO. Segment pl in VCD
The type of MPEG data is determined by referring to the target content data (1 byte) in the ayitem contents table. And
The type of decoding according to the value is set by transmitting a Set Stram command to the MPEG circuit unit 4, and the MP of the segment play item is set.
EG data is reproduced.

It should be noted that it is confirmed that the bit 5 of the target segment play item content data is 0, and if the bit 5 of the next content data is 0, it is understood that the target segment is 1 unit = 150 sectors. If 1 is 1, it means that the target segment is continuous in multiple units.
The reproduction period is a period before the point at which the data at t5 becomes 0 (the start of the next segment).

The method of calculating the location where the MPEG data of the segment play item is stored is as follows. That is, the offset value in the segment play item is calculated from the segment play item value (any value from 1 to 1980) x 150 sectors (2 seconds) (sector value unit), and this value is used as FIRST SECMENT ADAD
DRESS (Byte posi in INFO.VCD
The playback start address is calculated by adding (existing in the BCD format) to the Tions 49 to 51.

The playback time is defined by the value of Playing time (2 bytes) in the playlist structure, that is, when the value is 0, playback is performed until the end of the segment. Meaning 1
In the above case, it means that the reproduction of (the number) × 5 sectors is performed, and thus when the reproduction start address is obtained, the reproduction end address is determined.

Pl in the playlist structure
The ay Item Wait Time (1 byte) defines the waiting time after playing each play item. If the value is 0, there is no waiting time, if the value is 1 to 60, wait 1 to 60 seconds, and n ( However, if n is 61 or more and less than FFH), (n−60) × 10 + 60 seconds waiting FFH means waiting for an infinite time. The waiting process is canceled by the user's key input.

Furthermore, A in the playlist structure
When each sector trigger bit is set according to the value of auto Pause Wait Time, the automatic waiting process is performed (the MPEG circuit unit 4 uses auto Pause).
(Trigger) generate an interrupt [AP / EOR
/ EOF interrupt]. Also, it is canceled by the user's key input during the waiting process).

After the play list is executed, the "NEXT" list in the list structure is interpreted and executed.

Note that while the playlist is being executed, PREV
When the IOUS key, NEXT key, or RETUREN key is selected (operated), the key input processing corresponding to the selected key is performed.

The flowchart of FIG. 7 shows the processing procedure when the selection list is executed. When the selection list is executed, in steps S51 to S54, the video CD control unit 8 determines whether the enter key is operated after the previa key, the next key, the default key, or the ten-key (numeric key). . When any key is operated, the process corresponding to the key input corresponding to the operated key is read from the selection, and step S55
Through S58. Then, if there is no key input and a predetermined time has elapsed, that is, if a time-out has occurred, that effect is determined in step S59, and step S6
Go to 0, Timeout Li in the selection list
st is executed.

Specifically, for example, PSD. First list of VCD: When the selection list is executed (when it is not a multi-selection), binary data (word) is read from the area storing the list ID number in the list structure data, and its bit is read.
The value of 0 to bit14 is checked as the list ID number. When the list ID number is 0001 and the default offset value in the list structure is not FFFDh or FFFEh (when there is no multi-selection), play i
tem is executed.

At this time, (1) If the play item is 0 or 1, no particular process is performed as in the case of the play list. (2) If the play item has a value of 2 to 99, the reproduction process from that track number is performed. (3) If the play item has any value from 100 to 599, ENTRY. V
The reproduction process is performed from the point on the CD. (4) If the play item has any value from 1000 to 2929, the segment play item having a value obtained by subtracting 999 from the value is reproduced.

During execution of the selection list, P
When the REVIOUS key, the DEFAULT (PLAY) key, the NEXT key, the RETUREN key, or the number keys (1 to 99) is selected, the key input process corresponding to the selected key is performed.

In the selection item processing by ten key input (numerical input), the Base in the selection list structure is used.
of Selection Number (BSN)
By referring to, Se corresponding to the entered number
The processing of the list of the collection #BSN Offset values is performed.

Next Offset and Default
Offset is not executed in the case of FFFFh. In addition, Selection # N Offset
If the value of is FFFFh, the selected key input is ignored.

The time calculation regarding the timeout is the same as that in the play list. However, that time is the waiting time after the playback is performed the number of times specified by the loop count value in the selection list structure, and after the timeout, TimeoutOut in the same selection list structure.
The new list noted in stOffset is executed. Also, Timeout List Offset
After the wait time has elapsed and the t value is FFFFh, the Selection # N Offset List is displayed.
Are randomly executed (timeout does not occur if the user inputs a key while waiting for the timeout time).

Loop cou in the selection list
nt & jump timing is Play item
The number of play items indicated by the number is described. (1) When the lower 7 bits = 0, (2) When MSB = 0, when the user inputs a key (selection). , The playback of the current play item is interrupted, and the process moves to the next list. (3) When MSB = 1,
When the user inputs a key (selection), it means to move to the next list after the reproduction process of the currently executed play item is completed.

Next, when the CD mechanical control section 3 receives a Play (start address) command from the video CD control section 8 via the system control section 11, it reproduces data from this start address. The CD drive unit 2 is controlled, but at this time, the frame shift described above occurs. So, the video CD in Figure 1
In the reproducing apparatus, when the video CD 1 is loaded, the frame shift is detected and the shift is corrected. Hereinafter, this correction process will be described.

The flowchart of FIG. 8 shows the procedure of the correction process. When Video CD1 is loaded (inserted),
In step S61, mounting (insertion) information indicating that the video CD 1 has been mounted is transmitted from the CD mechanical control unit 3 to the video CD control unit 8 via the system control unit 11. Upon receiving the mounting information, the video CD control unit 8 transmits a command requesting CD type information to the CD mechanical control unit 3 in step S62. Upon receiving this command, the CD mechanical control unit 3 controls the CD drive unit 2 to
The TOC information is reproduced from 1. This TOC information is C
From the D drive unit 2 to the video CD control unit 8 via the CD mechanical control unit 3 and the system control unit 11.
Is supplied to.

In the video CD control unit 8, the TOC
By referring to the information, whether the loaded CD (video CD1 in this embodiment) is CD-DA or CD-I
Or CD-ROM-one XA. In addition, this determination is PS of POINT = A0H.
It is performed by referring to the EC value (for example, CD-D
In the case of A (CD-ROM), the PSEC value is 00, and in the case of a video CD, for example, the PSEC value is 20H).

Whether the mounted CD is a CD-DA,
If it is a CD-I, the subsequent processing is not performed.
Further, when the mounted CD is a CD-ROM 1XA, the video CD control unit 8 is the CD mechanical controller unit 3.
Control the CD drive unit 2, and the C
Data is reproduced from a predetermined address of D. This data is received by the video CD control unit 8 via the CD mechanical control unit 3 and the system control unit 11, and the video CD control unit 8 mounts the loaded CD (CD-ROM-XA) based on the data. Is a video CD.

If the loaded CD is not a video CD, the subsequent processing is not performed. If the mounted CD is a video CD, the video CD control unit 8
Determines whether the video CD (video CD1) is playback controllable. And video CD
The control unit 8 transmits the determination result to the CD mechanical control unit 3 in step S63, and further, in step S64, the frame shift amount is calculated as a correction value for correcting the frame shift as described later. It

After that, the process proceeds to step S65, and the video C
The D control unit 8 stores the correction value (frame shift amount) in the work area of the video CD core processing unit 21 (FIG. 2), or sends the correction value to the system control unit 11.

That is, when the video CD 1 is playback controllable, the control of the CD mechanical control unit 3 is as follows.
Since it is performed by the video CD control unit 8, the correction value is stored in the work area of the video CD core processing unit 21 forming the video CD control unit 8. Also,
When the video CD 1 is not playback controllable, the control of the CD mechanical controller 3 is performed by the system control unit 11, so the correction value is transferred to the system control unit 11.

After the above processing, when the video CD control unit 8 or the system control unit 11 transmits the start address together with the Play command to the CD mechanical control unit 3, the start address is corrected by the correction value (correction address ( For example, an address obtained by adding a correction value to the start address) is transmitted.

Next, referring to FIG. 9, step S in FIG.
Details of the processing of 64 (hereinafter, appropriately referred to as correction value calculation processing) will be described. First, in step S71, a video reproduction command for one frame from the beginning of the track 2, for example, is transmitted from the video CD control unit 8 to the MPEG circuit unit 4. Then, in step S72, the video CD control section 8 passes through the system control section 11 to the CD mechanical control section 3,
An address after the beginning of track 2 by at least 150 frames (hereinafter appropriately referred to as a post address AD)
A playback command is sent to instruct playback of the data from.

The reason why the subsequent address AD is an address at least 150 frames after the beginning of the track 2 is as follows. That is, the frame shift is usually about ± 20 frames as described above, but some of the video CD reproducing apparatuses on the market are simply manufactured, and such a video is not available. It has been confirmed that a CD reproducing apparatus causes a frame shift of about a little less than 150 frames. In order to support such a poor quality video CD reproducing apparatus, "at least 150 frames" is set.

When the CD mechanical control unit 3 receives the rear address AD together with the reproduction command, it controls the CD drive unit 2, whereby the CD drive unit 2 reproduces the data from the rear address as described above. . This data is supplied to the MPEG circuit unit 4 via the CD mechanical control unit 3.
The MPEG circuit unit 4 starts MPEG decoding of the received data, and the address (frame address in the CD-ROM-XA frame header) included in the data corresponds to the above-mentioned frame shift from the subsequent address. The address deviates by an amount, and the address exceeds the address one frame after the beginning of the track 2.

Therefore, from the MPEG circuit section 4 to the video C
For the D control unit 8, the address out-of-
A range interrupt is triggered. When the address out-of-range interrupt is applied, the video CD control unit 8 executes a predetermined interrupt process, and in the interrupt process, the MPEG circuit unit 4 sends the CD-
Read the frame address in the ROM-XA frame header. Then, in step S73, the video CD control unit 8 subtracts the rear address AD from the frame address to obtain the frame shift amount, that is,
The correction value is obtained, and the correction value calculation process ends.

As described above, after the reproduction command is transmitted to the CD mechanical control unit 3, the address AD and the CD-R are sent.
A correction value for correcting the frame shift is obtained based on the frame address in the OM-XA frame header, and thereafter, the address corrected with the correction value is transmitted to the CD mechanical controller 3 together with the reproduction command. Therefore, it becomes possible to access the desired address accurately and quickly.

The case where the present invention is applied to the video CD reproducing apparatus has been described above. However, the present invention is not limited to the apparatus for reproducing a CD-ROM, a CD-G, etc. The present invention can be applied to any device that drives a disk-shaped recording medium (for example, a karaoke device using a CD, a communication karaoke device, etc.).

In the present embodiment, the correction process shown in FIG. 8 is performed every time the video CD 1 is loaded in the apparatus, but the correction process may be performed at any other timing. It is possible.

[0094]

As described above, according to the disk drive device and the disk drive method of the present invention, the correction value is calculated,
When there is an instruction to reproduce the data from a predetermined address of the disc-shaped recording medium, the data is reproduced from the predetermined address of the disc-shaped recording medium corrected based on the predetermined correction value. Therefore, it is possible to quickly access a desired position on the disc-shaped recording medium.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a video CD reproducing apparatus to which the present invention is applied.

FIG. 2 is a block diagram showing a configuration example of a video CD control unit 8 in FIG.

FIG. 3 is a flowchart for explaining the processing of the video CD control unit 8 in FIG.

FIG. 4 is a flowchart for explaining a procedure of playback control.

FIG. 5 is a flowchart for explaining a processing procedure of playback control after execution of a play item.

FIG. 6 is a flowchart for explaining a processing procedure when a playlist is executed.

FIG. 7 is a flowchart for explaining a processing procedure when a selection list is executed.

FIG. 8 is a flowchart illustrating a procedure of correction processing.

9 is a flowchart for explaining details of step S64 in FIG.

FIG. 10 is a timing chart showing a shift between a subcode sync and a sector sync.

[Explanation of symbols]

 1 Video CD 2 CD drive section 3 CD mechanical controller section 4 MPEG circuit section 5 DRAM 8 Video CD control section 9 SRAM 11 System control section

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Fumi Kono 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (3)

[Claims] 1. A disk drive device for driving a disk-shaped recording medium, comprising: a reproducing means for reproducing data from the disk-shaped recording medium; a predetermined address transmitted to the reproducing means; The control means for controlling to reproduce the data, and the calculating means for calculating a predetermined correction value based on the address included in the data output from the reproducing means and the predetermined address. The disk drive device is characterized in that the predetermined address corrected based on the predetermined correction value is transmitted to the reproducing means. 2. The disk drive device, wherein the calculating means calculates the predetermined correction value every time the disk-shaped recording medium is mounted. 3. A disk drive method for driving a disk-shaped recording medium, wherein data is reproduced from a predetermined address of the disk-shaped recording medium, and the data is reproduced based on an address included in the data and the predetermined address. When a command is given to reproduce data from the predetermined address of the disc-shaped recording medium, the correction value is calculated based on the predetermined correction value of the disc-shaped recording medium. A disk drive method characterized in that data is reproduced from a predetermined address.