JP2001357612A - Recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the drop of the use efficiency of a recording medium such as an optical disk when sound data is recorded without compression, or after compression by leaving a data rate as high as it is for increasing dubbing speed. SOLUTION: (1) A signal recorded without compression is read, is recorded after compression and data of non-compression, whose recording is completed, are sequentially deleted. (2) The signal recorded by a compression method exceeding the prescribed data rate is read and expanded. The signal is recorded after compression by the compression method by making it to the prescribed data rate. Compression data whose recording is completed and which have the high data rate are sequentially deleted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus such as a rewritable optical disk and a semiconductor memory card, and more particularly, to a recording medium capable of compressing and rewriting track data in different recording states at a predetermined bit rate and having a large data capacity. The present invention relates to a rewritable recording / reproducing device.

[0002]

2. Description of the Related Art A conventional recording / reproducing apparatus of this type will be described with reference to FIG. FIG. 5 is a block diagram showing a configuration of a conventional audio signal recording device. In FIG. 5, the digital input unit 1
01 demodulates a digital signal obtained by modulating a digitized audio signal, outputs an audio signal, and performs sampling frequency and bit rate multiples (multiples relative to a standard bit rate) of the audio signal; Detect identification information and the like. The AD converter 102 converts the input audio analog signal into a digital signal. The sampling frequency of the AD converter 102 is controlled by the system control unit 107.

The selector 103 has a system control unit 107
The output signal of the digital input unit 101 or the output signal of the AD converter 102 is selected and output to the compression processing unit 104. The compression processing unit 104 compresses an output signal of the selector 103 in accordance with an instruction from the system control unit 107, and outputs an MP3 signal which is normally used as a compression method for audio data.
(MPEG1 layer 3) format signal is output. The MP3 format is described on pages 133 to 139 of "Radio Technology November 1998". However, the compression processing unit 104 uses a standard bit rate (actual audio signal) of a digital audio signal (bit rate = 1.536 Mbps) having a sampling frequency FS of 48 kHz, a quantization bit number BT of 16 bits, and a channel number CH of 2 channels. The limit performance is to compress a signal having the same bit rate as when the A / D is converted into an MP3 format signal. That is, an input signal having a higher bit rate cannot be compressed into the MP3 format.

Here, the product of the sampling frequency FS, the number of quantization bits BT, the number of channels CH, and the bit rate multiple RT input to the compression processing unit 104 will be referred to as a signal rate. The recording unit 105 includes a system control unit 107
According to the instruction, the output signal of the compression processing unit 104 is recorded on the optical disk 106 as a recording medium. The system control unit 107 controls the AD converter 102, the selector 103, based on the operation input information input from the operation input unit 108.
The compression unit 104 and the recording unit 105 are controlled. The operation input unit 108 is an input unit for the user to give a command to the recording apparatus, and includes a key switch and an on / off detection circuit. The operation input unit 108 receives settings such as recording start and recording source selection (analog or digital).

Next, the operation of the above-described conventional recording apparatus will be described. When the user instructs the selection of digital input and the start of recording by the operation input unit 108, the bit rate of the digital signal input to the digital input unit 101 is changed to the standard bit rate (the actual voice is converted into an analog signal). At the same bit rate as when the In this case, the digital input unit 101 is connected to the system control unit 10
7 is informed that the bit rate is a standard bit rate, and the demodulated audio signal is supplied to the selector 103. The system control unit 107 controls the selector 103 based on the digital input selection information supplied from the operation input unit 108.
Controls the digital input unit 101 to select the output. The compression processing unit 104 receives the output of the selector 103, compresses the audio signal into the MP3 format, and records the compressed data on a recording medium via a recording unit.

However, in the conventional recording apparatus, when the user instructs the selection of digital input and the start of recording by the operation input unit 108, the bit rate of the digital signal input to the compression processing unit 104 is lower than the standard. If it is high, for example, it is assumed that the bit rate is twice as high. In this case, since the compression processing unit 104 exceeds the limit performance,
The compression processing to the MP3 format cannot be performed. As a result, there is a problem that recording on a recording medium cannot be performed.

As a means for solving this problem, the inventor of the present application disclosed in Japanese Patent Application No. 2000-40597 that even if uncompressed audio data is input at a high signal rate exceeding the capability of the compression processing unit, There has been proposed a recording apparatus capable of recording on a recording medium such as an optical disk in real time without making the transmitting side wait.

The recording apparatus includes a compression processing section for compressing an input digital signal, a signal rate detecting means for detecting a signal rate of the input digital signal, or a signal rate setting means for setting a signal rate of the input digital signal. Compression detection means for detecting compression / non-compression identification information of the input digital signal, selector for selecting the output signal of the compression processing section and the input digital signal, signal rate detection means, or signal rate output by the signal rate setting means; A compression control unit that switches the selector based on the identification information output from the compression detection unit, and a recording unit that records a signal output from the selector on a recording medium are provided.

With this recording apparatus, even when uncompressed audio data is input at a high signal rate exceeding the capability of the compression processing unit, the non-compressed audio data is transferred to an optical disk or the like without passing through the compression processing unit. Conventionally, recording on a recording medium has been performed.

[0010]

However, in the above-mentioned conventional recording apparatus, high-bit-rate uncompressed audio data exceeding the capacity of the compression processing section is recorded on the recording medium in an uncompressed state. Therefore, compared with the case where the data is recorded on the recording medium in a compressed state, there is a problem that the amount of data to be recorded on the recording medium is increased and the time of the audio signal that can be recorded on the recording medium is shortened.

An object of the present invention is to record data by converting track data recorded in various states such as high bit rate compressed data and uncompressed data exceeding the capacity of a compression processing section into compressed data and recording the compressed data on a recording medium. An object of the present invention is to provide a recording / reproducing apparatus with high medium use efficiency.

[0012]

In order to achieve the above object, a recording / reproducing apparatus according to the present invention uses data divided into tracks (hereinafter referred to as track data), a position where the data is recorded, and a compression ratio. A recording medium on which TOC data (Table Of Contents) including information indicating the presence or absence of
The track data or the TOC from the recording medium
A reading unit that reads data, a buffer memory that stores the track data read by the reading unit,
A compression processing unit that compresses the track data read from the buffer memory, a writing unit that writes the compressed data supplied from the compression processing unit, or the TOC data to the recording medium, and the reading unit, the buffer memory, A system control unit for controlling the writing unit;

The system control section controls the read section and the buffer memory based on the TOC data, reads track data of an uncompressed track from the recording medium, and stores the track data in the buffer memory.
Further, the system control unit calculates a writing position of the data compressed via the compression processing unit based on the TOC data, and writes the compressed data from the writing unit to the recording medium. Put in. Thereafter, the system control unit controls the writing unit to update the information of the position where the track data of the uncompressed track of the TOC data recorded on the recording medium is recorded, and stores the information on the recording medium. Record.

Thus, the uncompressed track data can be automatically compressed and replaced. As a result, the free space of the recording medium can be increased, and the utilization efficiency can be increased.

According to another aspect of the present invention, there is provided a recording / reproducing apparatus comprising:
A recording medium on which track data and TOC data including information indicating a recording position and a compressed bit rate are recorded, a reading unit for reading the track data or the TOC data from the recording medium, and the reading unit A decompression processing unit that decompresses the track data read in the buffer memory that stores the track data decompressed by the decompression processing unit; a compression processing unit that compresses the decompressed track data read from the buffer memory; A writing unit that writes the compressed data supplied from the compression processing unit or the TOC data to the recording medium;
And a system control unit that controls the reading unit, the buffer memory, and the writing unit.

The system control unit controls the read unit and the buffer memory based on the TOC data to read track data of a track whose compressed bit rate is larger than a predetermined value from the recording medium. Stored in the buffer memory. Further, the system control unit causes the compressed data to be supplied to the writing unit via the compression processing unit, calculates a writing position based on the TOC data, Write data to Thereafter, the system control unit controls the writing unit so that the bit rate after the compression of the TOC data recorded on the recording medium is larger than a predetermined value. Update information.

Thus, track data that has not been compressed or that has been compressed at a higher rate than a predetermined bit rate can be replaced by being compressed at a predetermined bit rate. As a result, the free space of the recording medium can be increased, and the utilization efficiency can be increased.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the recording / reproducing apparatus according to the present invention will be described below with reference to the drawings. In the following embodiment, music digital data that is divided in track units on an optical disc as a recording medium and recorded in an uncompressed or compressed manner will be described as an example of track data.

Embodiment 1 FIG. 1 is a block diagram showing a configuration of a recording / reproducing apparatus according to Embodiment 1 of the present invention. In FIG. 1, a reading unit 202 sequentially reads audio data (hereinafter, referred to as track data) or TOC data divided in track units from an optical disc 201 as a recording medium. The buffer memory 203 includes the reading unit 20
2 stores the data read by the
According to the instruction of 7, the stored data is output. If the data output from the buffer memory 203 is uncompressed, the compression processing unit 204 compresses and outputs the data.

The writing unit 205 writes the compressed data output from the compression processing unit 204 to the optical disk 201 according to an instruction from the system control unit 207. Operation input unit 206
Outputs a conversion start flag in response to a user operation.
When the conversion start flag supplied from the operation input unit 206 is set, the system control unit 207 controls the reading unit 202 to read the TOC data from the optical disc 201.

Next, the operation of the recording / reproducing apparatus of this embodiment will be described with reference to FIGS. Figure 2 shows the TOC
FIG. 4 is a diagram showing an example of data arrangement of data. In FIG.
The TOC data is from track 1 to track 255 (in the figure, the track number is described as TNOn, where n = 1 to 2).
For each track up to 55), a track data existence flag, a recording start address, a recording end address, and compression identification information are configured. The track data presence / absence flag is 1-bit information. When "1", it indicates that the track data of the corresponding track number is recorded, and when "0", it indicates that it is not recorded. The recording start address is 12-bit information, and describes a sector number in a range from 0 sector to 4095 sectors on the optical disk. The recording end address is 12
Bit information, from 0 sector on the optical disc to 4
A sector number in the range of 095 sectors is described. The compression identification information is 1-bit information, and indicates “1” for compression and “0” for non-compression. These T
The OC data is recorded on an inner peripheral portion of the optical disc 201.

When the system control unit 207 refers to the TOC data and detects a track whose track data presence / absence flag is “1” and whose compression identification information is “0”, the system control unit 207 controls the read unit 202 to Is read out and stored in the buffer memory 203. When the memory capacity of the buffer memory 203 becomes full and it becomes impossible to store any more data, the system control unit 207 stops reading, reads data from the buffer memory 203, and supplies it to the compression processing unit 204. Further, the system control unit 207 checks the free area of the optical disc 201 with reference to the TOC data read by controlling the reading unit 202. Further, the system control unit 207 writes the
In step S 05, the data compressed by the compression processing unit 204 is written to a free area of the optical disc 201.

The system control unit 207 reads the recording start address and the recording end address of the track whose track data presence / absence flag is "1" from among the tracks recorded in the TOC data from the TOC data. Then, with respect to the recording end address of each track, the system control unit 207 searches other tracks for a recording start address that is larger and smaller than the recording end address. By this search, an empty area from the recording end position of a certain track to the recording start position of the next track is detected.

When the above operation is repeated and the writing of the music data for one track is completed, the system control unit 207
Controls the reading unit 202 to read the TOC data, and changes the recording start address and the recording end address of the corresponding track to the address of the newly written area.
Further, the system control unit 207 controls the writing unit 205 to write the TOC data whose address has been changed to the optical disc 201. After that, the system control unit 207
When the read unit 202 is controlled again to refer to the TOC data and detect a track whose compression identification information is “0”, as described above, the data for one track is compressed and recorded.
Perform data updates. The system control unit 207 repeats the above operation until there are no more uncompressed tracks, and stops the operation of compressed recording when there are no more uncompressed tracks.

As described above, the recording / reproducing apparatus according to the first embodiment determines the digital data of the music divided in track units, the position where the digital data is recorded, and the compression / non-compression of the digital data. An uncompressed track is read from the optical disc on which the TOC data composed of the compression flag and the TOC data is recorded, compressed, and recorded in a free area of the optical disc. Further, after the recording is completed, the recording / reproducing apparatus of the first embodiment updates the recording start address and the recording end address of the corresponding track on the TOC data.
As described above, according to the recording / reproducing apparatus of the present embodiment, by converting the uncompressed track data into the compressed track data and recording the data, the free space of the optical disk can be increased.

Embodiment 2 Next, a recording / reproducing apparatus according to Embodiment 2 of the present invention will be described with reference to FIGS. FIG. 3 is a block diagram illustrating a configuration of the recording / reproducing apparatus according to the second embodiment. FIG. 4 is a diagram illustrating an arrangement of TOC data in the recording / reproducing apparatus according to the second embodiment. In the recording / reproducing apparatus according to the second embodiment of the present invention, a track whose compressed bit rate is equal to or higher than a predetermined value is searched from the music digital data divided in track units. Then, after the music digital data is decompressed into uncompressed data, the data is automatically compressed and replaced by a compression process in which the bit rate after compression becomes equal to or less than a predetermined value. 3, the same components as those of the recording / reproducing apparatus according to the first embodiment shown in FIG. 2 are denoted by the same reference numerals, and redundant description will be omitted.

The decompression processing unit 208 which is a feature of the second embodiment
Expands the track data read by the reading unit 202 and demodulates the data into uncompressed track data. When the conversion start flag supplied from the operation input unit 206 is set, the system control unit 207 controls the read control unit 202 to read TOC data from the optical disc 201.

The operation of the recording / reproducing apparatus according to the second embodiment will be described.
This will be described with reference to FIGS. The first column from the left end to the fourth column on the right in FIG. 4 are the same as the configuration of the TOC data in the first embodiment of the present invention in FIG.
When the compression identification information of the TNOn (n = 1 to 255) in the fourth column is “1” (with compression), the compression rate of the TNOn (n = 1 to 255) in the fifth column is TNOn) is information indicating a bit rate after compression (hereinafter, referred to as a compression rate). This information is available at bit rates from 1 kbps (kilobits / second) to 4095 kbps.
Up to 12 bits. For example, when TNOn = 128, it indicates that the bit rate is 128 kbps. The compression unit 204 compresses the input uncompressed audio data to 128 kbps.

The system control unit 207 includes the reading unit 20
2 to refer to the TOC data, the track presence / absence flag is “1”, and the compression identification information for the track is “1”.
Track 1 is detected. Here, the compression rate is referred to, and if the compression rate exceeds 128 kbps, the system control unit 207 controls the read unit 202 to read the data of the corresponding track, and At 208, the compressed audio data is decompressed and demodulated into uncompressed data and stored in the buffer memory 203. If the storage capacity of the buffer memory 203 becomes full and no more data can be stored, The reading of the reading unit 202 is stopped, and the stored uncompressed data is read from the buffer memory 203 and supplied to the compression processing unit 204.

The compression processing section 204 compresses the supplied uncompressed data into compressed data compressed to 128 kbps and outputs the compressed data. Further, the system control unit 207 controls the reading unit 202 to refer to the TOC data, checks a free area of the optical disk 201, and controls the writing unit 205 to store the data compressed to 128 kbps into the optical disk 2
01 is written to the empty area. When the above operation is repeated and the writing of the music data for one track is completed, the system control unit 207 reads the TOC data by controlling the reading unit 202, and newly sets the recording start address and the recording end address of the corresponding track. Change to the address of the written area.

On the other hand, when the system control unit 207 detects a track whose track presence / absence flag is “1” and whose compression identification information is “0”, the system control unit 207 controls the reading unit 202 to
The data of the corresponding track is read out, and the
8 and stored in the buffer memory 203. Then, when the storage capacity of the buffer memory 203 is full, the reading is stopped, the data is read from the buffer memory 203, and supplied to the compression processing unit 204. Further, the system control unit 207 controls the reading unit 202 to refer to the TOC data, checks the free area of the optical disc 201, and controls the writing unit 205 to transfer the data compressed to 128 kbps to the free area of the optical disc 201. Write to.

The system control unit 207 repeats the above operation, and when writing of music data for one track is completed,
The reading unit 202 is controlled to read the TOC data.
Then, the system control unit 207 changes the recording start address and the recording end address of the corresponding track to the address of the newly written area. Further, the system control unit 207 controls the writing unit 205 to write the data whose address has been changed on the optical disc 201 as updated TOC data. On the other hand, if the track presence flag is "
1 ", the compression identification information is" 1 ", and the compression rate is 12
When a track having a track count of 8 or less or a track presence / absence flag of “0” is detected, the system control unit 207 determines the identification information of the next track without reading the data of the corresponding track. The system control unit 207 includes:
After the above operation is sequentially performed for all tracks, the operation is completed.

As described above, in the recording / reproducing apparatus according to the second embodiment of the present invention, the digital data of the music divided in track units, the position where the digital data is recorded, and the compression / non-compression are shown. An optical disk 201 on which TOC data composed of a flag and a compression rate indicating a bit rate after compression is used. Then, the recording / reproducing apparatus according to the second embodiment
Then, the audio data of the track that is not compressed or compressed at a higher rate than a predetermined bit rate is read out, compressed at a predetermined bit rate, and recorded in a free area of the optical disc 201. Further, after the recording is completed, the recording / reproducing apparatus of the second embodiment updates the recording start address and the recording end address of the corresponding track on the TOC data.

As described above, the recording / reproducing apparatus according to the second embodiment converts an uncompressed track or a compressed track recorded at a bit rate higher than 128 kbps into a 128 kbps.
The data is compressed so as to have a bit rate of s, re-recorded, and the registration of the original track data is deleted. As a result, Example 2
According to the recording / reproducing apparatus described above, by compressing and recording the track data recorded on the optical disc in any state, the free area of the optical disc can be increased.

In the recording / reproducing apparatuses of the first and second embodiments, the configuration in which track data is compressed according to a user's instruction has been described. However, the present invention is not limited to such a configuration, for example, by detecting the end of dubbing,
The compression operation may be automatically started. Or,
It is also possible to adopt a configuration in which the operation of the recording / reproducing apparatus is stopped for a predetermined time or longer and the compression operation is started. In the above embodiments, the optical disk has been described as an example. However, the same operation and effect can be obtained by using a magnetic disk, a semiconductor memory card, or the like as a recording medium.

[0036]

As described in detail in the above embodiments, the recording / reproducing apparatus of the present invention has the following effects. A recording / reproducing apparatus according to the present invention includes: a recording medium on which TOC data including track data, a recording position thereof, and information indicating whether or not compression is performed; a reading unit which reads the data from the recording medium; A buffer memory for storing the track data, a compression processing unit for compressing the track data read from the buffer memory, a writing unit for writing the compressed data or TOC data on a recording medium, and a reading unit; A system control unit for controlling the writing unit is provided.

Based on the TOC data, the system control section temporarily stores the track data of the uncompressed track in the buffer memory, and then compresses the track data at a predetermined compression rate by the compression processing section. The writing position is calculated based on the writing position. Then, the data compressed by the compression processing unit is written from the writing unit to the calculated predetermined writing position of the recording medium. Thereafter, the system control unit updates the recording position information of the track data of the uncompressed track of the TOC data recorded on the recording medium and records the information on the recording medium.

By performing such processing, the uncompressed music digital data divided in track units can be automatically compressed and replaced, and the free space of a recording medium such as an optical disk can be increased and its use efficiency can be increased. Can be increased.

A recording / reproducing apparatus according to another aspect of the present invention comprises:
Track data, a recording medium on which TOC data including the recorded position and information indicating the bit rate after compression are recorded, a reading unit that reads out these data from the recording medium, and expands the read track data. A decompression processor, a buffer memory for storing decompressed track data, a compression processor for compressing track data read from the buffer memory, compressed data, or T
The system includes a writing unit and a reading unit for writing OC data to a recording medium, a buffer memory, and a system control unit for controlling the writing unit.

Based on the TOC data, the system control section reads track data of a track having a bit rate after compression greater than a predetermined value, temporarily converts the track data into non-compressed data by a decompression processing section, and converts the track data into buffer data. To be stored. Thereafter, the track data stored in the buffer memory is compressed at a predetermined bit rate by the compression processing unit, and the write position is calculated based on the TOC data. Then, the compressed data is written from the writing unit to the calculated writing position of the recording medium at a predetermined bit rate. Thereafter, the system control unit controls the writing unit to update the recording position information of the track data of the track where the compressed bit rate of the TOC data recorded on the recording medium is larger than a predetermined value, and Record on the medium.

According to the recording / reproducing apparatus, by processing as described above, a track whose compressed bit rate is equal to or higher than a predetermined value is searched for from the digital music data divided in track units, and the track is decoded. Automatic compression and replacement are performed by a compression process in which the bit rate after compression becomes equal to or less than a predetermined value. As a result, according to this recording / reproducing apparatus, it is possible to compress and replace track data recorded in any state at a predetermined bit rate, to increase the free space of a recording medium such as an optical disk, and to improve the utilization efficiency. Can be increased.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 shows the TO in the recording / reproducing apparatus according to the first embodiment of the present invention.
The figure which shows arrangement | positioning of C data.

FIG. 3 is a block diagram illustrating a configuration of a recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 4 is a diagram illustrating a TO in a recording and reproducing apparatus according to a second embodiment of the present invention;
Diagram showing the arrangement of C data

FIG. 5 is a block diagram showing a configuration of a conventional recording apparatus.

[Explanation of symbols]

 201 recording medium 202 reading section 203 buffer memory 204 compression processing section 205 writing section 207 system control section 208 decompression processing section

Claims (2)

[Claims] 1. A TOC containing data divided into track units (hereinafter referred to as track data) and information indicating the recording position of the data and the presence or absence of compression.
(Recording state list: Table Of Contents) data (hereinafter referred to as TOC data) is recorded on the recording medium, the track data from the recording medium or the TOC is recorded.
A reading unit that reads data, a buffer memory that stores the track data read by the reading unit, a compression processing unit that compresses the track data read from the buffer memory, compressed data that is supplied from the compression processing unit, Or a writing unit that writes the TOC data to the recording medium, the reading unit, the buffer memory, and a system control unit that controls the writing unit. Controlling the read section and the buffer memory to read track data of an uncompressed track from the recording medium and store the track data in the buffer memory; and writing the track data compressed in the compression processing section to the writing section. To calculate the writing position based on the TOC data. The compressed track data is written from the writing unit to the recording medium, and thereafter, the writing unit is controlled to store the track data of the uncompressed track among the TOC data recorded on the recording medium. A recording / reproducing apparatus having a function of updating information of a recorded position and recording the information on the recording medium. 2. A recording medium on which track data and TOC data including information indicating a position where the track data is recorded and a bit rate after compression are recorded, wherein the track data or the TOC is recorded from the recording medium.
A read section for reading data; an expansion processing section for expanding the track data read by the reading section; a buffer memory for storing track data expanded by the expansion processing section; and the expanded memory read from the buffer memory. Compression processing section for compressing track data; compressed data supplied from the compression processing section; or TO
A writing unit that writes C data to the recording medium; a reading unit; a buffer memory; and a system control unit that controls the writing unit. The system control unit reads the C data based on the TOC data. Unit and the buffer memory to read track data of a track having a compressed bit rate greater than a predetermined value from the recording medium, store the track data in the buffer memory, and store the track compressed in the compression processing unit. Data is supplied to the writing unit, a writing position is calculated based on the TOC data, the compressed track data is written from the writing unit to the recording medium, and then the writing unit is controlled. Then, in the TOC data recorded on the recording medium, the track of a track whose bit rate after compression is larger than a predetermined value is recorded. A recording / reproducing apparatus having a function of updating information on a position where the recording data is recorded and recording the information on the recording medium.