JPH0574048A - Multi-recording system - Google Patents

Abstract

PURPOSE:To realize the multi-recording process of the signal of massive amount and continuing like a sound signal in a real time by using a disk. CONSTITUTION:A first data time axis compressed is recorded to the disk driven by a disk device 12. By a disk interface controlling means 20 controlling the data transmission with the disk device while changing a transmissive direction with time division, the first data is received and applied to a time axis expanding means 23. By the time axis expanding means, the time axis of a received data is expanded and applied to a multi-arithmetic processing means 24. To the multi-arithmetic processing means, a second data, as well continuing from the outside is applied, these first and second data are multiplexed, the data after multiplexed is applied to a time axis compressing means 25. By the time axis compressing means, the data after multiplexed is time axis compressed and applied to the disk interface controlling means. By this controlling means, the data after multiplexed is applied to the disk device and stored on the disk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex recording system, which is suitable for multiplex recording of audio signals on a disc-shaped recording medium.

[0002]

2. Description of the Related Art For example, in the case of an audio signal or a video signal, various kinds of editing (multiple processing) such as synthesizing two signals such as fade-in / fade-out are often performed.
In such a case, a multiplex recording system is used in which at least one signal is reproduced from a recording medium, the other signal is combined with this, and the signal is recorded again in the recording medium.

Conventionally, as a multiple recording system, there are a digital tape recorder and an analog tape recorder using a multi-track magnetic tape (Japanese Patent Laid-Open No. 1-22).
No. 0269). However, in the case of the analog tape recorder, there is a drawback that the signal is deteriorated when repetitive multiplex recording between tracks is performed. On the other hand, in the case of a digital tape recorder, although deterioration of quality can be suppressed as much as possible, since the magnetic tape is used, the access speed is high,
It has a drawback that it is easily scratched and the probability of occurrence of a burst error is high due to the scratches, and that both the apparatus and the magnetic tape are expensive.

Therefore, it is conceivable to realize the multiplex recording system by using a disk-shaped recording medium for recording a digital signal.

FIG. 5 shows a conventional audio recording system for recording a digital audio signal on a disk-shaped recording medium (magnetic disk) and reproducing the digital audio signal from the disk-shaped recording medium. Therefore, although this system itself does not realize the multiple recording function, this system will be described first.

In FIG. 5, the voice data output from the voice processing device 1 is given to a general-purpose personal computer 2. In the personal computer 2, the voice data taken in by the voice input / output interface 2a is temporarily stored in a built-in memory (for example, RAM disk) 2b, and then via the disk interface 2d under the control of the DOS (disk operating system) 2c. The data is given to the magnetic disk device (for example, hard disk device) 3 and recorded on the magnetic disk. On the other hand, the transfer of audio data from the magnetic disk device 3 to the audio processing device 1 is performed as follows. The DOS 2c is the magnetic disk device 3
To reproduce the audio data from the magnetic disk, take in the audio data via the disk interface 2d, store it in the internal memory 2b once, and then store the audio data stored in the internal memory 2b into the audio input / output interface 2a. To the voice processing device 1 via.

In this way, the voice processing device 1 can use the magnetic disk device 3.

Using the audio recording / reproducing system shown in FIG. 5, a digital audio signal (audio data) recorded on the magnetic disk of the magnetic disk device 3 and a digital audio signal (audio data) supplied from the audio processing device 1 are used. ) And (3) and try to record again on the magnetic disk of the magnetic disk device 3, the following sequence seems to occur. That is, (1) the digital audio signal in the magnetic disk device 3 is developed in the memory 2b under the control of the DOS 2c, and (2) the digital signal given from the audio processing device 1 is taken in via the audio input / output interface 2a. The audio signal and the digital audio signal transferred to the memory 2b are multiplexed by the CPU (not shown) of the personal computer 2 and stored again in the memory 2b. (3) The multiplexed digital audio signal stored again in the memory 2b is managed by the DOS 2c. It is considered that the sequence of transferring to the magnetic disk device 3 and recording on the magnetic disk is performed.

[0009]

However, as described above, if the configuration of the audio recording / reproducing system for the conventional disc-shaped recording medium is left as it is and the multiple recording is realized by the combination of the functions, the following problems will occur. There is.

The speed of multiple processing is greatly influenced by the processing capacity of the personal computer 2 and the capacity of the memory 2b. Therefore, it is difficult to deal with a large amount of continuous data series information such as video signals and audio signals in real time. This means that the conventional recording / reproducing system using the disc-shaped recording medium cannot realize real-time multiplex recording of audio signals and video signals.

It is not necessary to make the disc-shaped recording medium for recording the pre-multiplex data and the disc-shaped recording medium for recording the post-multiplex data the same, but they should be the same for simplification of the system. Is required. It can be inferred that real-time feasibility may be somewhat easier when different recording media are used. Therefore, the above-mentioned problem is large in a system using the same recording medium.

The present invention has been made in consideration of the above points, and can perform multiplex recording processing of a large amount and continuous signals such as audio signals and video signals in real time. The present invention is intended to provide a multiplex recording system using the disc-shaped recording medium.

[0013]

In order to solve such a problem, according to the present invention, a disk device for driving a disk-shaped recording medium for recording first pre-multiplexed data whose time axis is compressed, A disk interface control means for controlling bidirectional data transfer with the disk device while alternately changing the direction in a time division manner, and a first disk recorded on the disk-shaped recording medium received by the data interface control means. Of the pre-multiplex data, the time-axis expanding means for expanding the time axis of the pre-multiplex data to convert it into continuous data, the pre-multiplex data input means for taking in the second pre-multiplex data consisting of continuous data, and the first data converted to continuous data. The first pre-multiplexing data and the second pre-multiplexing data are multiplexed, and the time axis of the post-multiplexing data from the multiplex processing unit is compressed to compress the data. And a time axis compressing means to be supplied to the I disk interface control means, also multiplexed after data so as to be stored in the disc-shaped recording medium.

[0014]

In the present invention, the first pre-multiplexed data whose time axis is compressed is recorded on the disk-shaped recording medium driven by the disk device. The disk interface control means controls the bidirectional data transfer with the disk device while alternately changing the transfer direction in a time division manner. When the first pre-multiplexing data is received from the disk device, the time axis expansion is performed. Give to the means. The time axis expansion means expands the time axis of the first pre-multiplexing data to convert it into continuous data, and supplies it to the multiplex operation processing means. The second pre-multiplexing data, which is continuous data taken in by the pre-multiplexing data inputting means, is also given to the multiplex arithmetic processing means. The multiplex operation processing means multiplexes the first pre-multiplexed data and the second pre-multiplexed data converted into continuous data, and supplies the post-multiplexed data to the time base compression means. The time axis compression means compresses the time axis of the multiplexed data and gives it to the disk interface control means. At this time, the disk interface control means supplies the multiplexed data composed of compressed data to the disk device and stores it in the above-mentioned disk-shaped recording medium.

In this way, real-time multiplexing processing can be realized even if the same disk-shaped recording medium for data before and after multiplexing is used.

[0016]

【Example】

[First Embodiment] A first embodiment in which the present invention is applied to a voice multiplex recording system will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the first embodiment.

In FIG. 1, this multiple recording system is
The multi-processing device 10, a general-purpose personal computer (hereinafter referred to as a host computer) 11 and a magnetic disk device 12 are provided.
Are interconnected by a multitasking, multicontroller bus (eg SCSI bus) 14. Therefore, without going through the personal computer 11,
Audio data can be exchanged between the audio processing device 10 and the magnetic disk device 12.

Next, the reproduction operation of the audio data, the multiplexing operation of the audio data, and the recording operation of the multiplexed audio data will be described, and the detailed configuration of each part will be clarified through this description.

When the reproduction of audio data for multiple processing is instructed, the host computer 11 fetches the information (directory information etc.) of the existing file to be reproduced (multiplexed) by the operation software 11a, and then the DOS 11b. By management, the file information is given to the magnetic disk device 12 via the disk interface 11c, and the magnetic disk device 12 is made to retrieve the location address (reading parameter) on the disk. At this time, if the file data is arranged in a plurality of sets of sectors, the head address of each set and its size are searched for in the entire file, and the reading parameters are acquired. FIG. 2 shows a case where, for example, the data of the file A is recorded in three consecutive sector groups E1 to E3. In this case, each sector group E1, E2,
The head address of E3 and its size are read parameters.

Next, the operation software 11a
In order to secure a storage area for a file that is multiplexed and newly generated, the magnetic disk device 1 is managed by the DOS 11b via the disk interface 11c.
By checking all the files of No. 2, an unused continuous area of the magnetic disk device 12 is searched, and the start address of the area and the generated file size are acquired as storage parameters.

When the read parameter and the storage parameter are acquired in this way, the host computer 11
Issues a start command including these parameters to the multi-processing device 10.

In the multi-processor 10, this command is issued by a disk interface controller (for example, SC
SI controller) 20. When the disk interface controller 20 receives the command, it directly executes data transfer with the magnetic disk device 12 without going through the host computer 11. That is, one of the multiplexed audio data (hereinafter referred to as pre-multiplex read audio data) is transferred from the magnetic disk device 12, and the multiplexed audio data (hereinafter referred to as post-multiplexed audio data) is a magnetic disk. It is transferred to the device 12. Such bidirectional data transfer is controlled so as to be performed alternately in a time division manner. Since the disk interface controller 20 alternately performs such bidirectional data transfer, the time axis of both the pre-multiplex read audio data and the post-multiplex audio data to be transferred is compressed.

Disk interface controller 20
Is connected to the controller CPU 21 and the bus selector 22 via an internal bus in the multiprocessing device 10.

The bus selector 22 is a controller CPU
Under the control of 21, the transferred pre-multiplex read voice data is given to the time axis expansion circuit 22 at the time of reception thereof. The time axis expansion circuit 22 expands the time axis of the pre-multiplex read audio data and restores it to the original time axis of the audio data, thereby converting it into continuous audio data. The pre-multiplex read-out voice data converted into continuous voice data in this way is given to a means (not shown; for example, a sounding device) by which the timing of the multiplex processing is known to the operator, and the multiple operation processing circuit 24. The time axis expansion circuit 22 is composed of a FIFO memory, for example, and expands the time axis of data by changing the writing speed and the reading speed.

Further, the multiplex arithmetic processing circuit 24 has continuous audio data (hereinafter referred to as pre-multiplexed input data) from audio data input means (not shown) (for example, a combination of a microphone or a tape recorder and an analog / digital conversion circuit). Call) is also given. Further, a multimode signal is given from the controller CPU 21 described above. The multiplex mode signal is composed of information indicating the type of multiplex processing (such as superposition of audio data, fade-in / fade-out, replacement of a part of audio data, etc.) and the timing indicating the valid period of each audio data in the multiplex processing. There is. These pieces of information are given to the controller CPU 21 from the host computer 11 and / or from the input means provided in the multi-processing device 10.

The multiplex arithmetic processing circuit 24 multiplexes the pre-multiplexed read audio data and the pre-multiplexed input audio data, which are both continuous data, according to the multiplex mode signal, and outputs the post-multiplexed audio data to the time axis compression circuit 25. give. The time axis compression circuit 25 compresses the time axis of the post-multiplex audio data composed of continuous data for every predetermined block, and supplies the post-multiplex audio data which is an intermittent data series to the bus selector 22. In addition,
The time axis compression circuit 25 is also composed of, for example, a FIFO memory, and compresses the audio data by changing the writing speed and the reading speed.

The bus selector 22 is a controller CPU
According to the control of 21, the time base compression circuit 25 outputs the compressed audio data after multiplexing,
A bus connected to the time axis compression circuit 25 is selected and the multiplexed audio data is given to the disk interface controller 20.

Disk interface controller 20
Is the host computer 11 when a command is given.
According to the storage parameters given by the above, the transfer processing to the magnetic disk device 12 is performed, and the multiplexed audio data is stored in the magnetic disk.

A series of operations by the multi-processing device 10 have been described above, but in the following, the processing timings of the time-base decompression circuit 23 and the time-base compression circuit 25 (hence the data transfer timing) will be described using the timing chart of FIG. ) Etc. are described in detail.

Now, the amount of data per transfer from the disk device 12 is N [bytes], and the writing speed to the time axis expansion circuit 23 (equal to the transfer speed from the magnetic disk device 12) f1 [bytes / second]. Then, as shown in FIG. 3A, the time for writing the pre-multiplex read voice data by one transfer to the time axis expansion circuit 23 is N / f1 [second].
Becomes The speed originally read by the pre-multiplex read voice data, that is, the read speed from the time axis expansion circuit 23 is f
If 2 [bytes / second] is set, the time for reading the pre-multiplex read audio data by one transfer from the time axis expansion circuit 23 is N / f2 [seconds] as shown in FIG.
In order to prevent the read operation from overtaking the write operation, it is required that the read cycle and the write cycle are equal. Therefore, the write cycle is also N / f2 [second].
Therefore, when writing to the time axis expansion circuit 23, the
As shown in (A), there is a margin of time N / f2-N / f1 [second]. This margin time is also a time during which data transfer from the magnetic disk device 12 to the multi-processing device 10 is not executed.

Therefore, data transfer in the reverse direction from the multiprocessing device 10 to the magnetic disk device 12 is performed during this margin time. The writing process to the time axis compression circuit 25 is naturally synchronized with the data transfer from the multiprocessing device 10 to the magnetic disk device 12. Since the data of the same speed as the data read from the time-base decompression circuit 23 is given to the time-base compression circuit 25, the writing speed is f2 [byte / byte / byte] as shown in FIG. 3 (C).
Seconds]. In order to prevent conflict in bidirectional data transfer, the compression cycle is also N / f2 [sec].

Now, assuming that the reading speed from the time axis compression circuit 25 is f3 [bytes / second], one reading time is
As shown in FIG. 3D, it is N / f3 [seconds]. Only when the read time N / f3 [sec] is shorter than the write margin time N / f2-N / f1 [sec] for the time axis expansion circuit 23, the bidirectional data transfer as described above may compete. Disappear. That is, real-time multiple processing becomes possible.

As described above, the data transfer speed with the disk device 12 and the data write speed and read speed of the time base expansion circuit 23 and the time base compression circuit 25 are selected.

Therefore, according to the first embodiment described above, it is possible to realize a real-time multiplex recording process of a large amount of continuous audio data even if the magnetic disks before and after multiplexing are the same.

Of course, the effect associated with the multiplex processing at the digital signal stage (for example, little signal deterioration) and the effect associated with the use of the disk-shaped recording medium (for example, burst error is unlikely to occur) are: This also occurs in this first embodiment.

[Second Embodiment] Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows the peripheral parts of the second embodiment different from the first embodiment. Therefore, the parts not shown are the same as in the first embodiment.

As shown in FIG. 4, in the second embodiment, the configuration of the time base expansion circuit 30 (reference numeral 23 in the first embodiment) and the time base compression circuit 40 (reference numeral 25 in the first embodiment) is the first. Different from the first embodiment. In the case of the first embodiment, since the FIFO memory is used, the data writing process and the data reading process can be executed in parallel. However, in the second embodiment, the data writing process and the data reading process are performed. The time axis conversion process as shown in FIG. 3 can be executed by using a general-purpose memory that cannot be executed in parallel.

The time-base expansion circuit 30 has memories 31 and 32 on two sides where complementary operations are performed. That is, while the transferred pre-multiplex read voice data is being written to one memory 31 (including the write margin period), the written data is read from the other memory 32 (data is read by this reading). On the contrary, when the transferred pre-multiplex read voice data is being written in the memory 32, the written data is read from the memory 31 to obtain the first embodiment. Similar time-axis expansion processing is realized. Since the memory for writing and the memory for reading are switched, bus selectors 33 and 34 are provided on the input side and the output side. The controller CPU 21 also controls the selecting operations of the bus selectors 33 and 34 in synchronization with each other.

Since the structure and operation principle of the time axis compression circuit 40 are the same as those of the time axis expansion circuit 30, detailed description thereof will be omitted.

According to the second embodiment as well, even if the same magnetic disk is used before and after multiplexing, real-time multiple recording processing of a large amount of continuous audio data can be realized. Further, the second embodiment has an effect that it can be realized by using a general-purpose memory.

[Other Embodiments] The present invention is not limited to audio data multiplex processing, but can also be applied to image data, measured waveform data, and other multiplex processing. Further, the part that performs the function executed by the host computer 11 may be provided inside the multi-processing device 10 and realized as a dedicated device. Further, a disk device may be used as an output device for the pre-multiplexed input audio data, and in this case, another time axis expansion circuit is required in the multiplex processing device 10. It goes without saying that the disc-shaped recording medium is not limited to the magnetic disc.

[0042]

As described above, according to the present invention, the pre-multiplexing data is time-axis compressed and recorded on the disc-shaped recording medium, and the read pre-multiplexing data is time-axis expanded to restore continuous data. After that, the data is multiplexed with other pre-multiplexed data, the post-multiplexed data is time-axis compressed, and then stored again in the above-mentioned disc-shaped recording medium. It is possible to realize a multiplex recording system capable of performing multiplex processing in real time even when the medium is the same.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment.

FIG. 2 is an explanatory diagram of parameters for reading from a disc.

FIG. 3 is an operation timing chart of the first embodiment.

FIG. 4 is a block diagram showing a main configuration of a second embodiment.

FIG. 5 is a block diagram showing a conventional disc recording / reproducing system.

[Explanation of symbols]

10 ... Multiprocessor, 11 ... Host computer, 12
... disk device, 20 ... disk interface controller, 21 ... controller CPU, 22, 33, 3
4, 43, 44 ... Bus selector, 23, 30 ... Time axis expansion circuit, 24 ... Multiplex operation processing circuit, 25, 40 ... Time axis compression circuit, 31, 32, 41, 42 ... General-purpose memory.

Claims (1)

[Claims] 1. A disk device for driving a disk-shaped recording medium, which records first pre-multiplexed data whose time axis is compressed, and bidirectional data transfer with the disk device. The disk interface control means for controlling while alternately changing the division, and the time axis of the first pre-multiplexed data received by the data interface control means and recorded on the disk-shaped recording medium are expanded into continuous data. A time axis expansion means for converting, a pre-multiplexing data input means for taking in second pre-multiplexing data consisting of continuous data, a first pre-multiplexing data converted into continuous data, and a second pre-multiplexing data Multiple calculation processing means for processing, and time axis compression means for compressing the time axis of the multiplexed data from this multiple operation processing means and giving it to the disk interface control means. Multiplex recording system, wherein a comprises also a multi-post-data so as to be stored in the disc-shaped recording medium.