JP2004310864A - Recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recorder for converting data of a format (for example, LP2 mode) that cannot be reproduced by a low order device into data of a format (for example, SP mode) that can be reproduced by the low order device and recording the data on a recording medium (for example, MD). <P>SOLUTION: An optical pickup 4 reads compressed data in an LP2 mode stored in an MD 3, and an encoder/decoder/signal processing circuit 6 decodes the read compressed data. A data compression/decompression circuit 9 decompresses the decoded compressed data in the LP2 mode into a stage where compression in an SP mode can be performed and compresses the decompressed data in the SP mode. A recording head 16 and the optical pickup 4 record the data compressed in the SP mode on the MD 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording device that records data on a recording medium.
[0002]
[Prior art]
As a recording device for recording data on a recording medium, an MD recording / reproducing device capable of recording data on a mini-disc (hereinafter, referred to as MD) and reproducing MD data will be described as an example. explain.
[0003]
The MD recording / reproducing apparatus is of a type that records compressed digital data obtained by compressing digital audio data (PCM data) to about 1/5 by the ATRAC method on the MD or reproduces the data from the MD (hereinafter, SP mode compatible). MD recording / reproducing apparatus) and compressed digital data obtained by compressing digital audio data (PCM data) to about 1/8 (LP2 mode) or about 1/16 (LP4 mode) by the recently developed ATRAC3 system. There is a type that records on an MD or reproduces from an MD (hereinafter, referred to as an LP2 mode / LP4 mode compatible MD recording / reproducing device). It is to be noted that the LP recording / reproducing apparatus compatible with LP2 mode / LP4 mode is generally upper compatible (upward compatible) capable of supporting SP mode in order to effectively use MD already recorded in SP mode. That is, the LP recording / reproducing apparatus compatible with the LP2 mode / LP4 mode is generally an MD recording / reproducing apparatus supporting the SP mode / LP2 mode / LP4 mode added with the function supporting the SP mode.
[0004]
[Patent Document 1]
JP 2000-32388 A
[0005]
[Problems to be solved by the invention]
As described above, the MD recording / reproducing apparatus can be roughly classified into an SP mode-compatible MD recording / reproducing apparatus and an SP mode / LP2 mode / LP4 mode-compatible MD recording / reproducing apparatus. MD recorded in the SP mode can be reproduced by both the SD mode compatible MD recording and reproducing apparatus and the SD mode / LP2 mode / LP4 mode compatible MD recording and reproducing apparatus. However, the MD recorded in the LP2 mode or the LP4 mode cannot be reproduced by the SD mode-compatible MD recording / reproducing apparatus.
[0006]
Therefore, when trying to use the LP2 mode or the LP4 mode, one of the following three methods must be selected.
[0007]
The first method is to replace all the MD recording / reproducing devices owned by the MD recording / reproducing devices compatible with the SD mode / LP2 mode / LP4 mode. However, in this method, it is necessary to purchase a new MD recording / reproducing apparatus compatible with the SD mode / LP2 mode / LP4 mode, which imposes a cost burden on the user.
[0008]
The second method is to record on the MD in the SP mode without using the LP2 mode or the LP4 mode even when the recording is performed by the MD recording / reproducing apparatus corresponding to the SD mode / LP2 mode / LP4 mode. However, in this method, since the LP2 mode and the LP4 mode are not used, the LP2 mode / LP4 mode corresponding function added to the higher-level device (SD mode / LP2 mode / LP4 mode compatible MD recording / reproducing apparatus) is wasted. .
[0009]
A third method is to use an MD recording / reproducing apparatus compatible with SP / LP2 / LP4 mode as a reproducing apparatus, reproduce an MD recorded in LP2 mode or LP4 mode, perform digital output, and perform an MD recording / reproducing apparatus compatible with SP mode. Alternatively, another SP mode / LP2 mode / LP4 mode compatible MD recording / reproducing apparatus is used as a recording apparatus, and a digital output of the SP mode / LP2 mode / LP4 mode compatible MD recording / reproducing apparatus to be used as a reproducing apparatus is inputted, and a new one is input. There is a method of recording in an MD as SP mode. However, this method requires a plurality of MD recording / reproducing devices.
[0010]
In view of the above problems, the present invention converts data of a format that cannot be reproduced by a lower device (for example, an MD recording / reproducing device compatible with SP mode) into data of a format that can be reproduced by a lower device and records the data on a recording medium. It is an object of the present invention to provide a recording device that performs the recording.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a recording apparatus according to the present invention reads compressed data of a predetermined format stored in a recording medium and decompresses the compressed data to a stage where compression in another format can be performed ( For example, the compressed data is expanded until immediately before it is converted from frequency axis data to time axis data) decompression means, compression means for compressing the data output by the decompression means in the different format, Recording means for recording the recorded data on the recording medium.
[0012]
According to the recording apparatus having such a configuration, even if compressed data of a predetermined format stored on a recording medium is data of a format that cannot be reproduced by a lower device, the compressed data of the predetermined format can be transferred to a lower device. Data in another format that can be reproduced can be converted, and the converted data can be recorded on a recording medium. Therefore, it is possible to obtain a recording medium that can be reproduced by both the lower device and the higher device.
[0013]
Further, the free space of the recording medium and the capacity of the compressed data of the predetermined format are detected, and the capacity when the compressed data of the predetermined format is converted to the other format is calculated. Determining means for determining whether or not the capacity is equal to or less than the free space of the medium, and only when the determining means determines that the calculated capacity is equal to or less than the free capacity of the recording medium, the recording means performs compression by the compression means. The recorded data may be recorded on the recording medium.
[0014]
Thus, it is possible to prevent a situation in which data in another format cannot be stored in the recording medium.
[0015]
Further, the recording means may erase the compressed data of the predetermined format and record the data compressed by the compression means on the recording medium.
[0016]
According to the recording apparatus having such a configuration, even if compressed data of a predetermined format stored on a recording medium is data of a format that cannot be reproduced by a lower device, the compressed data of the predetermined format can be transferred to a lower device. Data in another format that can be reproduced can be converted, and the converted data can be recorded on a recording medium. Therefore, it is possible to obtain a recording medium that can be reproduced by both the lower device and the higher device. Further, since data in a format that cannot be reproduced by a lower device is deleted, the amount of data that can be newly recorded on a recording medium can be increased.
[0017]
Further, when the recording means erases the compressed data of the predetermined format and records the data compressed by the compression means on the recording medium, the free space of the recording medium and the compressed data of the predetermined format are used. , And calculates a capacity when the compressed data of the predetermined format is converted into the another format, and calculates the calculated capacity between the free capacity of the recording medium and the capacity of the compressed data of the predetermined format. It is provided with determination means for determining whether the total capacity is equal to or less than the total, only when the determination means determines that the calculated capacity is equal to or less than the total of the free capacity of the recording medium and the capacity of the compressed data of the predetermined format, The recording means may record the data compressed by the compression means on the recording medium.
[0018]
Thus, it is possible to prevent a situation in which data in another format cannot be stored in the recording medium.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings. Here, as the recording apparatus according to the present invention, an MD recording / reproducing apparatus will be described as an example. FIG. 1 is a block diagram showing a configuration example of an MD recording / reproducing apparatus according to the present invention.
[0020]
The MD 3 mounted on the MD recording / reproducing apparatus 1 is an optical disk housed in a plastic cartridge, and is recorded or reproduced on a spiral track from the center.
[0021]
The MD recording / reproducing apparatus 1 drives the MD 3 to rotate by the spindle motor 2 and irradiates the rotating MD 3 with a laser beam from the optical pickup 4. The optical pickup 4 focuses the laser beam on the MD 3 by an objective lens (not shown). The feed motor 19 is a motor for moving the optical pickup 4 in a direction perpendicular to the MD3 track. The drive circuit 18 supplies electric power to the spindle motor 2, the feed motor 19, and a driving device (not shown) for driving the objective lens of the optical pickup 1 based on a control signal output from a servo circuit 17 described later. Supply. The servo circuit 17 is a circuit that feeds back each of the above-described devices driven by the drive circuit 18 so that an operation such as making the laser beam emitted from the optical pickup 4 follow a target track of the MD 3 is performed accurately. . The servo circuit 17 determines a control amount based on the output of the RF amplifier 5 according to an instruction from the system controller 10 and sends the control amount to the drive circuit 18 as a control signal. The system controller 10 is a microcomputer that centrally manages the encoder / decoder / signal processing circuit 6, the shockproof memory controller 7, the servo circuit 17, and the display device 21 in accordance with an instruction from the input device 20.
[0022]
The operation of the MD recording / reproducing apparatus having the above configuration will be described. First, the operation at the time of reproduction will be described. The reproduction signal is read by detecting the reflected light of the MD 3 with the optical pickup 4, amplified by the RF amplifier 5, and supplied to the encoder / decoder / signal processing circuit 6. Note that the detection rate of the reproduced signal is 1.4 Mbits / sec, which is the same as the CD.
[0023]
The encoder / decoder / signal processing circuit 6 performs decoding by EFM and ACIRC to convert a reproduced signal into compressed digital data, and performs predetermined processing such as error correction on the compressed digital data. The encoder / decoder / signal processing circuit 6 decodes the EFM and ADIP to extract an address signal from the reproduced signal. The address signal is sent to the servo circuit 17 via the system controller 10. On the other hand, the compressed digital data is sent to the shockproof memory 8 via the shockproof memory controller 7. The shockproof memory 8 absorbs the difference between the transfer rate of the compressed digital data output from the encoder / decoder / signal processing circuit 6 and the transfer rate of the compressed digital data input to the data compression / decompression circuit 9 described later. It is provided for the purpose of preventing interruption of reproduction due to disturbance such as vibration. The shock proof memory 8 stores information on the TOC area of the MD3 and information on the UTOC area in addition to the music information on the user data area.
[0024]
The shock proof memory controller 7 controls the writing operation and the reading operation of the shock proof memory 8 which is a DRAM of several M bits (for example, 4 M bits), and compresses the compressed digital data supplied from the encoder / decoder / signal processing circuit 6. The data is temporarily stored in the shock proof memory 8, and the data stored in the shock proof memory 8 is output to the data compression / expansion circuit 9 in response to a request for each sound group from the data compression / expansion circuit 9. When outputting the data for one sector, the shock proof memory controller 7 notifies the system controller 10 that the data for one sector is requested.
[0025]
The system controller 10 reads information of the TOC area or UTOC information stored in the shock proof memory 8 through the shock proof memory controller 7 and instructs the encoder / decoder / signal processing circuit 6 to read the next sector. I do. In response, the encoder / decoder / signal processing circuit 6 sends the data of the next sector to the shockproof memory controller 7.
[0026]
The data compression / decompression circuit 9 performs a reverse conversion process of the compression encoding, and demodulates the compressed digital data into full-bit digital audio data (PCM data) at a rate of 0.3 Mbit / sec. The demodulated digital audio data (PCM data) is converted to analog audio data by a digital / analog conversion circuit 11 and output from an output terminal 12 to the outside.
[0027]
Next, the operation at the time of recording will be described. Analog audio data is input to the input terminal 13, and the analog audio data is converted by the analog / digital conversion circuit 14 into digital audio data (PCM data) having a sampling rate of 44.1 kHz.
[0028]
The data compression / decompression circuit 9 encodes the digital audio data (PCM data) supplied from the analog / digital conversion circuit 14 into compressed digital data at a rate of 0.3 Mbit / sec by performing encoding according to the ATRAC method or the ATRAC3 method. The compressed digital data is sent to the encoder / decoder / signal processing circuit 6 via the shockproof memory controller 7 and the shockproof memory 8.
[0029]
The encoder / decoder / signal processing circuit 6 encodes the input compressed digital data into a serial magnetic field modulation signal and provides the serial magnetic field modulation signal to the recording head drive circuit 15. The recording head drive circuit 15 moves the recording head 16 to a predetermined recording position on the MD 3 and generates a magnetic field corresponding to the magnetic field modulation signal. At this time, a laser beam is emitted from the optical pickup 4 to a predetermined recording position on the MD 3, whereby a magnetization pattern corresponding to the magnetic field is formed on the MD 3.
[0030]
Next, the operation of each mode (SP mode, LP2 mode, LP4 mode) of the data compression / decompression circuit 9 during recording / reproduction will be described in detail.
[0031]
<Recording in SP mode>
FIG. 2 shows a functional block diagram of the data compression / decompression circuit 9 when recording is performed in the SP mode. Digital audio data (PCM data) output from the analog / digital converter 14 (see FIG. 1) is input to the audio buffer memory unit 9a. After storing the data for a predetermined unit time, the audio buffer memory unit 9a outputs the stored data for the predetermined unit time to the band division filter unit 9b at the next stage.
[0032]
The band division filter unit 9b divides the data for a predetermined unit time into digital signals for three bands according to the frequency band, and outputs the digital signals to the signal analysis unit 9c at the next stage. The signal analysis unit 9c performs signal analysis and masking processing on the input digital signal for each band using simultaneous masking, a minimum audible curve and the like to reduce the amount of data, and sends the signal to the next-stage orthogonal transformation unit 9d for each band. Output. The orthogonal transformer 9d performs an orthogonal transform (MDCT: discrete cosine transform) on the input digital signal for each band, and outputs the resultant signal to the code string generator 9e as a spectral signal for each band. The code sequence generation unit 9e encodes the input spectrum signal into three of word length data, scale amount data, and compressed data for each band, collects them into a predetermined data amount, and generates encoded data as the shock proof memory controller 7 (FIG. 1). Output).
[0033]
<Recording in LP2 mode or LP4 mode>
FIG. 3 shows a functional block diagram of the data compression / decompression circuit 9 when recording is performed in the LP2 mode or the LP4 mode. In FIG. 3, the same parts as those in FIG. 2 are denoted by the same reference numerals. Digital audio data (PCM data) output from the analog / digital converter 14 (see FIG. 1) is input to the audio buffer memory unit 9a. After storing the data for a predetermined unit time, the audio buffer memory unit 9a outputs the stored data for the predetermined unit time to the band division filter unit 9b 'at the next stage.
[0034]
The band division filter unit 9b 'divides the data for a predetermined unit time into four digital signals for each of the four bands according to the frequency band, and inputs the digital signals to the signal analysis unit 9c' at the next stage. The signal analysis unit 9c 'performs signal analysis and masking processing on the input digital signal for each band using simultaneous masking, a minimum audible curve and the like to reduce the data amount, and the next-stage orthogonal transformation unit 9d' for each band. Output to
[0035]
The orthogonal transform unit 9d ′ performs orthogonal transform (MDCT: discrete cosine transform) on the input digital signal for each band, and outputs it to the spectrum signal encoding unit 9f as a spectrum signal for each band. The spectrum signal encoding unit 9f separates the input spectrum signal into a tone component and a non-tone component, performs an encoding process on each component, and outputs the components to the code sequence generation unit 9e 'for each band. The code string generation unit 9e 'encodes the input digital signal into four of word length data, scale amount data, tone data, and compressed data for each band, collects them into a predetermined data amount, and generates encoded data as a shock proof memory controller. 7 (see FIG. 1).
[0036]
<Playback in SP mode>
FIG. 4 shows a functional block diagram of the data compression / decompression circuit 9 when the reproduction is performed in the SP mode. The encoded data output from the shockproof memory controller 7 (see FIG. 1) is input to the code string separating unit 9g. The code sequence separation unit 9g decodes the input coded data into a spectrum signal based on word length data, scale amount data, and compressed data for each band, and outputs the spectrum signal to the inverse orthogonal transform unit 9h. The inverse orthogonal transform unit 9h performs an inverse orthogonal transform (IMDCT) on the input spectrum signal to convert it into a digital signal for each band, and outputs the digital signal to the band synthesis filter unit 9j. The band synthesizing filter unit 9j synthesizes the input digital signal for each band and outputs it as PCM data to the audio buffer memory unit 9k. After storing data for a predetermined unit time, the audio buffer memory unit 9k outputs the data for the predetermined unit time to the digital / analog converter 11 (see FIG. 1).
[0037]
<Playback in LP2 mode or LP4 mode>
FIG. 5 shows a functional block diagram of the data compression / decompression circuit 9 when reproduction is performed in the LP2 mode or the LP4 mode. In FIG. 5, the same parts as those in FIG. 4 are denoted by the same reference numerals. The encoded data output from the shockproof memory controller 7 (see FIG. 1) is input to the code string separating unit 9g '. The code string separating unit 9g ′ decodes the input coded data into a tone code and a non-tone code based on word length data, scale amount data, tone data, and compressed data for each band, and outputs it to the tone decoding unit 91. . The tone decoding unit 91 decodes the input tone code and non-tone code, and outputs the result to the spectrum signal decoding unit 9m. The spectrum signal decoding unit 9m combines the input spectrum signals for each band and outputs the result to the inverse orthogonal transform unit 9h '. The inverse orthogonal transform unit 9h ′ performs an inverse orthogonal transform (IMDCT) on the input spectrum signal, converts the spectrum signal into a digital signal for each band, and outputs the digital signal to the band synthesis filter unit 9j ′. The band synthesizing filter unit 9j 'synthesizes the input digital signals for the respective bands and outputs the synthesized digital signals to the audio buffer memory unit 9k as PCM data. After storing data for a predetermined unit time, the audio buffer memory unit 9k outputs the data for the predetermined unit time to the digital / analog converter 11 (see FIG. 1).
[0038]
Next, the format conversion operation, which is a feature of the present invention, will be described with reference to FIG. The reproduction signal of a predetermined data amount is read by detecting the reflected light of the MD 3 storing the data recorded in the LP2 mode or the LP4 mode by the optical pickup 4, amplified by the RF amplifier 5, and encoded by the encoder / decoder / The signal is supplied to the signal processing circuit 6.
[0039]
The encoder / decoder / signal processing circuit 6 performs decoding by EFM and ACIRC to convert a reproduced signal into compressed digital data, and performs predetermined processing such as error correction on the compressed digital data. The encoder / decoder / signal processing circuit 6 decodes the EFM and ADIP to extract an address signal from the reproduced signal. The address signal is sent to the servo circuit 17 via the system controller 10. On the other hand, the compressed digital data is sent to the shockproof memory 8 via the shockproof memory controller 7.
[0040]
The shock proof memory controller 7 controls the write operation and the read operation of the shock proof memory 8, and temporarily stores the compressed digital data supplied from the encoder / decoder / signal processing circuit 6 in the shock proof memory 8, The data stored in the shock proof memory 8 is output to the data compression / expansion circuit 9 in response to a request for each sound group from the data compression / expansion circuit 9. When outputting the data for one sector, the shock proof memory controller 7 notifies the system controller 10 that the data for one sector is requested.
[0041]
The system controller 10 reads information of the TOC area or UTOC information stored in the shock proof memory 8 through the shock proof memory controller 7 and instructs the encoder / decoder / signal processing circuit 6 to read the next sector. I do. In response, the encoder / decoder / signal processing circuit 6 sends the data of the next sector to the shockproof memory controller 7.
[0042]
The data compression / decompression circuit 9 converts the LP2 mode or LP4 mode compressed digital data into SP mode compressed digital data, and converts the SP mode compressed digital data via the shock proof memory controller 7 and the shock proof memory 8. The signal is sent to the encoder / decoder / signal processing circuit 6.
[0043]
The encoder / decoder / signal processing circuit 6 encodes the input SP mode compressed digital data into a serial magnetic field modulation signal and provides the serial magnetic field modulation signal to the recording head drive circuit 15. The recording head drive circuit 15 moves the recording head 16 to a predetermined recording position on the MD 3 and generates a magnetic field corresponding to the magnetic field modulation signal. At this time, a laser beam is emitted from the optical pickup 4 to a predetermined recording position on the MD 3, whereby a magnetization pattern corresponding to the magnetic field is formed on the MD 3. By performing the above operation on all the data in the LP2 mode or the LP4 mode stored in the MD3, the data in the LP2 mode or the LP4 mode and the data in the SP mode are stored in the MD3. The MD in which the data of the LP2 mode or the LP4 mode and the data of the SP mode obtained in this manner are stored is stored in the upper device (SP mode / LP2 mode / LP4 mode compatible MD recording / reproducing apparatus) and the lower device (SP mode compatible MD). MD recording / reproducing device).
[0044]
Before performing the format conversion operation, the system controller 10 recognizes the free space of the MD3 and the data capacity of the LP2 mode or the LP4 mode by reading the information in the UTOC area of the MD3, and furthermore, the data of the LP2 mode or the LP4 mode. The data capacity of the SP mode when the capacity is converted to the data of the SP mode is calculated. If the data capacity of the SP mode is larger than the free space of the MD3, an error is displayed on the display device 21 and the process does not shift to the format conversion operation. It is desirable to do so.
[0045]
In the above embodiment, the SP mode data obtained by the format conversion is written to the MD storing the LP2 mode or LP4 mode data, and the LP2 mode or LP4 mode data and the SP mode data are stored. Although the MD is obtained, the data in the LP2 mode or the LP4 mode corresponding to the writing of the data in the SP mode may be erased to obtain an MD storing only the data in the SP mode. In this case, before performing the format conversion operation, the system controller 10 recognizes the free space of the MD3 and the data capacity of the LP2 mode or the LP4 mode by reading the information in the UTOC area of the MD3, and furthermore, reads the information in the LP2 mode or the LP4 mode. A data capacity of the SP mode when the data capacity is converted to the data of the SP mode is calculated, and when the data capacity of the SP mode is larger than the sum of the data capacity of the LP2 mode or the LP4 mode and the free capacity of the MD3, the display device It is desirable that an error be displayed on the display 21 so as not to shift to the format conversion operation.
[0046]
Next, the operation of the data compression / decompression circuit 9 during format conversion will be described in detail. FIG. 6 shows a functional block diagram of the data compression / decompression circuit 9 when format conversion is performed. In FIG. 6, the same parts as those in FIGS. 2 and 5 are denoted by the same reference numerals.
[0047]
The encoded data output from the shockproof memory controller 7 (see FIG. 1) is input to the code string separating unit 9g '. The code string separating unit 9g 'decodes the input coded data into tone codes and non-tone codes based on word length data, scale amount data, tone data, and compressed data for each band, and outputs the decoded data to the tone decoding unit 91. . The tone decoding unit 91 decodes the input tone code and non-tone code, and outputs the result to the spectrum signal decoding unit 9m. The spectrum signal decoding unit 9m combines the input spectrum signals for each band and outputs the result to the inverse orthogonal transform unit 9h '. The inverse orthogonal transform unit 9h ′ performs an inverse orthogonal transform (IMDCT) on the input spectrum signal, converts the spectrum signal into a digital signal for each band, and outputs the digital signal to the partial band synthesis filter unit 9p.
[0048]
The partial band synthesizing filter unit 9p converts the input digital signal for each of the four bands into a digital signal for each of the three bands for the SP mode, and outputs the digital signal to the data buffer memory 9q.
[0049]
The signal analysis unit 9c performs simultaneous signal masking, signal analysis using a minimum audible curve or the like on the digital signal for each band input to the data buffer memory 9q, reduces the amount of data by performing a masking process, and performs the next-stage orthogonal transform for each band. Output to the unit 9d. The orthogonal transform unit 9d performs orthogonal transform (MDCT: discrete cosine transform) on the input digital signal for each band, and outputs the resultant signal to the code sequence generating unit 9e as a spectral signal for each band. The code sequence generation unit 9e encodes the input spectrum signal into three of word length data, scale amount data, and compressed data for each band, collects them into a predetermined data amount, and generates the encoded data as the shock proof memory controller 7 (FIG. 1). Output).
[0050]
In the present embodiment, the MD recording / reproducing apparatus has been described as an example. However, the present invention is not limited to this, and other disc-type recording media such as a CD-RW and a hard disk or recording on a solid-state memory or the like is possible. A recording device that records data that has been subjected to compression format conversion on a medium may be used.
[0051]
【The invention's effect】
According to the present invention, it is possible to realize a recording apparatus that converts data in a format that cannot be reproduced by a lower device into data in a format that can be reproduced by a lower device and records the data on a recording medium.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration example of an MD recording / reproducing apparatus according to the present invention.
FIG. 2 is a functional block diagram of a data compression / decompression circuit included in the MD recording / reproducing apparatus of FIG. 1 during recording in the SP mode.
FIG. 3 is a functional block diagram of a data compression / decompression circuit included in the MD recording / reproducing apparatus of FIG. 1 during recording in the LP2 mode or the LP4 mode.
FIG. 4 is a functional block diagram of a data compression / decompression circuit included in the MD recording / reproducing apparatus of FIG. 1 during reproduction in the SP mode.
FIG. 5 is a functional block diagram of a data compression / decompression circuit provided in the MD recording / reproducing apparatus of FIG. 1 during reproduction in the LP2 mode or the LP4 mode.
6 is a functional block diagram of a data compression / decompression circuit included in the MD recording / reproducing apparatus of FIG. 1 during format conversion.
[Explanation of symbols]
1 MD recording / reproducing device
3 Mini disc (MD)
4 Optical pickup
5 RF amplifier
6 Encoder / decoder / signal processing circuit
7 Shock proof memory controller
8 Shock proof memory
9 Data compression / decompression circuit
10 System controller

Claims (4)

Decompression means for reading compressed data of a predetermined format stored in a recording medium and decompressing the compressed data to a stage where compression in another format can be performed;
Compression means for compressing the data output by the decompression means in the different format;
Recording means for recording the data compressed by the compression means on the recording medium,
A recording device comprising: Detecting the free space of the recording medium and the capacity of the compressed data of the predetermined format, calculating the capacity when the compressed data of the predetermined format is converted to the another format, and calculating the calculated capacity of the recording medium. A determination unit for determining whether the storage capacity is equal to or less than the free space;
2. The recording method according to claim 1, wherein the recording unit records the data compressed by the compression unit on the recording medium only when the determination unit determines that the calculated capacity is equal to or less than the free space of the recording medium. Recording device. 2. The recording apparatus according to claim 1, wherein the recording unit erases the compressed data of the predetermined format, and records the data compressed by the compression unit on the recording medium. Detecting the free space of the recording medium and the capacity of the compressed data of the predetermined format, calculating the capacity when the compressed data of the predetermined format is converted to the another format, and calculating the calculated capacity of the recording medium. A determination unit that determines whether the free space is equal to or less than a total of the capacity of the compressed data of the predetermined format,
Only when the determination means determines that the calculated capacity is equal to or less than the total capacity of the free space of the recording medium and the capacity of the compressed data of the predetermined format, the recording means sets the data compressed by the compression means. 4. The recording device according to claim 3, wherein the recording device records on the recording medium.

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