JP2001143380A - Data transfer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data transfer device which can transfer compressed data and monitor the contents of the transfer data without providing an interface for compressed data transfer and an interface for monitoring audio data individually. SOLUTION: This device is equipped with a mixed data generating device 109 which generates and outputs mixed data of specific word length composed of compressed data and audio data obtained by expanding the compressed data by an expansion processor 108.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer device, and more particularly to a data transfer device for transferring compressed audio data obtained by performing compression processing on audio data while monitoring the data.

[0002]

2. Description of the Related Art A reproducing device reads data from a recording medium on which music data is recorded, and transfers the data to the recording device.
A dubbing operation of recording the data on another recording medium by a recording apparatus is generally performed. At present, MPEG
(Moving PictureExperts Co
Ding Group) and ATRAC (Adaptive)
e Transform Acoustic Codi
ng) has been developed, which is performed after digitizing music data.
As described in Japanese Patent Application Laid-Open No. 834, a dubbing method for reading compressed data recorded on a recording medium and recording the data without performing decompression processing has been proposed, and a minidisk has been read from the viewpoint of copyright protection. A method of erasing data on a recording medium on the reading side after compressed data is recorded without being decompressed has also been put to practical use. The method of dubbing the compressed data without decompressing it as it is has the advantage that the sound quality is less deteriorated compared to the case where the data is decompressed, converted into audio data once, and then re-compressed and recorded.

However, when a dubbing operation is performed with compressed data, since the transfer data is compressed data, the contents of the data being transferred cannot be confirmed as it is. Therefore, for example, as described in Japanese Patent Application Laid-Open No. H11-3566, there has been proposed a method of generating audio data by performing decompression processing while transmitting compressed data, converting the data into an audio signal by a D / A converter, and monitoring the data. Hereinafter, this conventional apparatus will be described with reference to the drawings.

FIG. 14 is a block diagram showing the configuration of a conventional data transfer device. In the drawings, reference numerals with an a symbol indicate devices on the recording side, symbols without an a symbol indicate devices on the reproduction side, and devices having the same reference numerals have the same functions.

In FIG. 14, bit data recorded on the MD is read out by the optical pickup 5 on the reproducing side and amplified by the RF amplifier 8. The address decoder 9 obtains address information from the data of the RF amplifier 8, and based on the signal from the RF amplifier 8 and the signal from the address decoder 9, the EFM / ACIRC encoder / decoder 1 performs EF.
M (Eight to Fourteen Modul)
) demodulation processing and ACIRC (Advanc)
ed Cross Interleaved Reed
-Solomon Code) Error correction processing is performed to generate compressed data. The generated compressed data is temporarily stored in the buffer memory 12, and then transferred from the vibration-proof memory controller 14 to the recording-side vibration-proof memory controller 14a via the signal line LN1.

The memory controller 14a for vibration proofing on the recording side
The compressed data transferred to the buffer memory 12a
After that, the interleaving process, the error correction coding process, and the EFM modulation process are performed by the EFM / ACIRC encoder / decoder 1a, and the magnetic head 3a and the optical pickup 5a controlled by the magnetic head driving circuit 2a are used. Recorded on the magneto-optical disk MDa.

On the other hand, the compressed data temporarily stored in the buffer memory 12 is sent to the buffer memory 13 for monitoring, and is transferred to the audio compression / decompression encoder / decoder 15 via the anti-vibration memory controller 14. The voice compression / decompression encoder / decoder 15 decompresses the compressed data from the memory controller 14 for earthquake resistance, supplies the decompressed data to the monitor selection unit 16, selects digital data to be reproduced by the reproducing apparatus, and then converts the digital / analog converter (hereinafter referred to as a digital / analog converter). An analog audio signal is output via a D / A converter 17.

Reference numeral 4 denotes a spindle motor, 6 denotes an objective lens, 7 denotes a feed motor, 10 denotes a servo control circuit, 11 denotes a system controller, and LN2 denotes a signal line of a synchronization signal.

[0009]

However, in such a configuration, an interface for transferring the compressed data is necessary for performing the decompression process and monitoring the transferred data while transferring the compressed data to another recording apparatus. There is a problem that an interface for monitoring audio data is required separately.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. The present invention solves the above-mentioned problem by providing compressed data transfer interface and audio data monitoring interface without separately providing compressed data transfer and transfer data transfer. It is an object of the present invention to provide a data transfer device capable of monitoring the contents of the data transfer.

[0011]

SUMMARY OF THE INVENTION A data transfer apparatus according to the present invention comprises a hybrid having a predetermined word length composed of compressed data and audio data obtained by subjecting the compressed data to decompression processing by a decompression processing device. It is provided with a hybrid data generation device that generates and outputs data.

According to the present invention, the compressed data and the audio data obtained by decompressing the compressed data are transferred as one composite data, so that the transfer data and the audio data are conventionally required. The interface can be operated by one interface, and the dubbing operation of the compressed data and the monitoring of the transfer data can be performed more efficiently at the same time.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a data transfer apparatus according to Embodiment 1 of the present invention.
FIG. 6 is a configuration diagram of mixed data according to the first embodiment of the data transfer device of the present invention, and FIG. 7 is an explanatory diagram of output signals of the DAC interface according to the first embodiment of the data transfer device of the present invention.

In FIG. 1, a signal read from a magneto-optical disk (hereinafter, referred to as a disk) 101 by an optical pickup 103 is amplified by an RF amplifier 104 and sent to a signal processing unit 105. Note that a magnetic head 102 is provided for recording. In the signal processing unit 105, RF
The signal from the amplifier 104 is subjected to EFM demodulation processing and error correction processing to become compressed data. The compressed data is transferred to the memory controller 106. The system controller 121 intermittently controls writing of compressed data from the signal processing unit 105 to the vibration-proof memory 107 via the memory controller 106. This is to absorb the difference between the data transfer rate on the signal processing unit 105 side and the transfer rate on the decompression processing device 108 side. Note that a system controller 122 that cooperates with the system controller 121 is also provided in the recording-side device. The compressed data written in the anti-shake memory 107 is read by the memory controller 106 in units of one frame (212 bytes) and sent to the decompression processing device 108. The decompression processor 108 performs decompression processing on the compressed data, and outputs audio data in which one frame has 512 words.

The hybrid data generator 109 has a frame buffer memory having a word length of 16 bits for audio data and a frame buffer memory having a word length of 8 bits for compressed data, and temporarily holds data in frame units. . The hybrid data generator 109 has a 24-bit register 601 as shown in FIG. 6, and reads audio data from the frame buffer memory one word at a time, and similarly reads compressed data one word at a time. The audio data is stored in the upper 16 bits of the register 601 and the compressed data is stored in the lower 8 bits of the register 601 to generate one word of 24-bit mixed data. The generated mixed data is written to the output buffer memory inside the mixed data generation device 109 word by word. As a result, mixed data 602 having a 24-bit width of 512 words is generated in the output buffer memory. The compressed data is 21
Since there are only two words, the lower 8 bits of the remaining 300 words are zero data. Conversely, 8 bits of compressed data may be stored on the upper side of the mixed data, and 16 bits of digital audio data may be stored on the lower side of the mixed data. The configuration of the mixed data may be adjusted to the characteristics of the D / A converter 112 that outputs the monitor audio signal.

The hybrid data is transferred from the output buffer memory in the hybrid data generator 109 to the DAC interface 110 every 512 words. The signal output from the DAC interface 110 is as shown in FIG.
FIG. 7A shows the case where the audio data is on the upper side, and FIG. 7B shows the case where the audio data is on the lower side. As described above, three signals of the word clock, the mixed data, and the bit clock are transmitted from the DAC interface 110. Word clock 1
The word is 24 bits, and in normal audio data transfer, the word clock polarity is stereo L channel, R channel.
Indicates that it is channel data.

These three signals branch on the way, and one is transferred to the D / A converter 112. The D / A converter 112 performs analog conversion of the data based on the clock transferred from the DAC interface 110 and reproduces the data. Thus, the contents of the compressed data being transferred can be monitored.

On the other hand, the output signal of the DAC interface 110 is similarly transferred to the ADC interface 111, and the ADC interface 111 generates again the mixed data which is the input data of the DAC interface 110, and transfers it to the compressed data generator 113. The compressed data generation device 113 reads out 512 words of mixed data transferred from the ADC interface 111, reads out only 212 words from the beginning, cuts out lower 8 bits, and cuts out compressed data for one frame.
Transfer to the memory controller 115. The memory controller 115 writes the compressed data transferred from the compressed data generator 113 into the anti-vibration memory 114, reads out the data again, and transfers it to the signal processing unit 116. The signal processing unit 116 performs interleaving and EFM modulation processing to perform the magnetic head 119. The compressed data is recorded on the disk 120 by the optical pickup 118. The recording-side device also has the same RF amplifier 1 as the RF amplifier 104 of the reproduction-side device.
17 are provided.

As described above, according to the present embodiment, 1
It is possible to simultaneously perform the transfer of compressed data, the transfer of audio data that is the result of the decompression processing of compressed data, and the monitoring operation using two interfaces.Conventionally, when performing the transfer of compressed data and monitoring of the transferred data, What used different interfaces can be performed by one interface.

In this embodiment, an example using a DAC interface has been described. However, when transferring mixed data generated by the mixed data generation unit, the same effect can be obtained with another audio interface.

(Embodiment 2) FIG. 2 is a block diagram showing a configuration of a data transfer apparatus according to Embodiment 2 of the present invention.
FIG. 8 is an explanatory diagram of compressed data transfer timing and decompression processing timing in the data transfer device according to the second embodiment of the present invention, and FIG. FIG. 4 is an explanatory diagram of a read operation timing in FIG.

Disk 201 and magnetic head 2 shown in FIG.
02, optical pickup 203, RF amplifier 204, signal processing unit 205, anti-vibration memory 207, decompression processor 20
8, mixed data generation device 209, DAC interface 210, ADC interface 211, compressed data generation device 213, anti-vibration memory 214, signal processing unit 21
6, the RF amplifier 217, the magnetic head 219, the optical pickup 218, and the disk 220 are the disk 1 shown in FIG.
01, magnetic head 102, optical pickup 103, RF
Amplifier 104, signal processing unit 105, anti-vibration memory 107,
Decompression processor 108, hybrid data generator 109, DA
C interface 110, ADC interface 1
11, compressed data generation device 113, anti-vibration memory 114,
Operations similar to those of the signal processing unit 116, the RF amplifier 117, the optical pickup 118, the magnetic head 119, and the disk 120 are performed, and therefore detailed description thereof will be omitted, and the operation of other components will be described here.

In FIG. 2, a clock generator 223 supplies a clock signal to the memory controller 206, the decompression processor 208, and the hybrid data generator 209. The supplied clock signal is a clock setting signal transmitted from the system controller 221, the memory controller 206 transfers one frame of compressed data every 11.6 ms, the decompression processing unit 208 performs one frame decompression processing, and The generator 209 outputs three kinds of clock signals, a reference clock, a double frequency, and a quadruple frequency, which are necessary for performing a process of generating one frame of mixed data.

FIG. 8 shows the timing of transfer data, decompression processing, and audio data. The frame timing is generated from the clock supplied from the clock generator 223. 1 frame period for normal speed
Data transfer and decompression are performed in 6 ms.
In the case of 4 × speed, data transfer and decompression processing are also 2
This is performed in a quarter of a quarter. DAC
The frequencies of the bit clock and the word clock output from the interface 210 are also doubled and quadrupled as the clock from the clock generator 223 is doubled and quadrupled.

The word clock, mixed data, and bit clock output from the DAC interface 210
The two signals are input to the ADC interface 225, generate mixed data again, are transferred to the data reading device 226, and are temporarily stored in an internal buffer. The data reading device 226 receives the clock setting signal sent from the system controller 221 to the data reading timing generating device 230, detects the data transfer speed, and reads the mixed data held in the internal buffer at a period corresponding to the transfer speed. The audio data is read out intermittently.
FIG. 9 shows the relationship between the input data timing and the transfer timing in the data reading device 226.
In the case of the normal data transfer rate, audio data is read out for all the input mixed data,
As shown in FIG. 9, at the time of double speed and at the time of quadruple speed, the read operation is performed intermittently so that the output audio data becomes one frame every 11.6 ms as in the case of the normal speed. The read audio data is D
/ A converter 227, and reproduces it as a monitor sound.

On the other hand, in the ADC interface 211, similarly to the ADCIF 227, mixed data is obtained from the transfer signal and written into the internal buffer memory in units of 512 words. The system controller 222 provides transfer rate information to the system controller 221, and the system controller 222 instructs the clock generator 224 to supply the same frame timing as the clock generator 223 to the compressed data generator 213 and the memory controller 215. . As a result, the compressed data generating device 213 and the memory controller 215 also operate at high speed in accordance with the data transfer speed. The compressed data is extracted from the mixed data, passed through the anti-vibration memory 214, the signal processing unit 216, and the magnetic head 219. 220 will be recorded. In the case of high-speed transmission of compressed data, when the audio signal for monitoring is reproduced at the same high speed as the transmission speed of the compressed data, the pitch of the monitor sound changes and it is difficult to hear the sound signal. By performing the intermittent playback operation, the change in the pitch of the playback sound is suppressed,
It will be easier to hear.

As described above, according to the present embodiment, the interface between the compressed data and the audio data can be made one, and the duplication operation of the compressed data can be performed at a high speed while the pitch of the reproduced signal is kept high. Reduce fluctuations,
A better monitor sound can be reproduced. In the present embodiment, the example of the compressed data transfer speed is up to four times. However, if a higher transfer speed is required, it can be realized by increasing the rotation speed of the disk. In this case, it is necessary to control the disk rotation speed by the system controller.

(Embodiment 3) FIG. 3 is a block diagram showing a configuration of a data transfer apparatus according to Embodiment 3 of the present invention.
FIG. 10 is an explanatory diagram of the intermittent operation timing of the decompression process in the third embodiment of the data transfer device of the present invention.

The disk 301 and the magnetic head 3 shown in FIG.
02, optical pickup 303, RF amplifier 304, signal processing unit 305, memory controller 306, anti-vibration memory 307, hybrid data generation unit 309, DAC interface 310, ADCIF 325, D / A converter 32
7, ADC interface 311, compressed data generator 313, anti-vibration memory 314, memory controller 31
5, signal processing unit 316, RF amplifier 317, optical pickup 318, magnetic head 319, disk 320, system controllers 321, 322, clock generator 3
Reference numerals 23 and 324 denote the disk 201, the magnetic head 202, the optical pickup 203, the RF amplifier 204, and the like shown in FIG.
Signal processing unit 305, memory controller 206, anti-vibration memory 207, hybrid data generation unit 209, DAC interface 210, ADCIF 225, D / A converter 227, ADC interface 211, compressed data generation device 213, anti-vibration memory 214, memory controller 215, signal Processing unit 216, RF amplifier 217, optical pickup 218, magnetic head 219, system controllers 221, 222, clock generators 223, 224
Perform the same operation, so that the detailed description thereof will be omitted, and the operation of the other components will be described here.

In order to change the transfer rate of the compressed data, the system controller 321 outputs a clock switching signal to the clock generator 323. In response to the clock switching signal, the clock generation device 323 sends clocks of three different frequencies: a frequency required to complete the decompression processing and the mixed data generation processing within 11.6 ms, a frequency twice the frequency, and a frequency four times the frequency. I do. The decompression processing timing generator 331 receives the clock switching signal from the system controller 321 and supplies a timing signal for intermittently performing the decompression processing to the decompression processor 308.

Here, as shown in FIG. 10, the decompression process is performed intermittently according to the data transfer speed. For example, when the data transfer speed is four times, the compression is performed once for four frames of compressed data. Therefore, the audio data is also generated intermittently, the audio data becomes zero data except when the decompression process is performed, and the mixed data includes only the compressed data.

The mixed data is stored in the DAC interface 31
0, data reading device 32 through ADCIF 325
6 is transferred. When data is transferred at high speed, the data read timing generation device 330 detects information on the data transfer speed from the system controller 321 and reads out audio data that is intermittently transferred according to the transfer speed. A data read timing signal is transmitted to the data read device 326. Based on this timing signal, the data reading device 326 reads the audio data that is intermittently transferred, and transfers it to the D / A converter 327.

As described above, according to the present embodiment, it is possible to use a single interface for compressed data and audio data, and to perform intermittent transmission at the time of high-speed transfer of compressed data described in the second embodiment. Instead of reading the data to make it easier to hear the monitor sound, decompressing only the compressed data used for monitoring and stopping the processing for the other data allows the compressed data to be transferred at a high speed, The change in pitch can be suppressed, and the expansion process can be performed more efficiently.

(Embodiment 4) FIG. 4 is a block diagram showing a configuration of a data transfer apparatus according to Embodiment 4 of the present invention.
FIG. 11 is a configuration diagram of mixed data according to a compression ratio of compressed data in the data transfer apparatus according to the fourth embodiment of the present invention.
FIG. 2 is an explanatory diagram of a word clock that changes according to a compression ratio of compressed data in a data transfer device according to a fourth embodiment of the present invention.

The disk 401 and the magnetic head 4 shown in FIG.
02, optical pickup 403, RF amplifier 404, signal processor 405, anti-vibration memory 407, decompression processor 40
8, compressed data generation device 413, anti-vibration memory 414, memory controller 415, signal processing unit 416, RF amplifier 417, magnetic head 419, optical pickup 418,
The disk 420 includes the disk 101, the magnetic head 102, the optical pickup 103, and the RF amplifier 10 shown in FIG.
4, signal processing unit 105, anti-shake memory 107, decompression processing device 108, compressed data generation device 113, anti-shake memory 11
4, memory controller 115, signal processing unit 116, R
F amplifier 117, optical pickup 118, magnetic head 1
19 and the disk 120, respectively, and therefore, detailed description thereof is omitted, and the operation of the other components will be described here.

In addition to the compressed data, additional data relating to the transfer compressed data is transferred to the data output from the signal processing unit 405. The memory controller 406 separately reads and outputs data relating to the compression ratio of the transfer compression data therein. The compression rate data indicates whether the data has been compressed at a normal compression rate or has been compressed at twice the normal compression rate. The mixed data word number switching setting device 424 receives the compression rate data and outputs a word number switching signal indicating whether the compression rate is a normal compression rate or a double compression rate.

The hybrid data generator 409 receives the word number switching signal. In the case of a normal compression ratio, FIG.
The hybrid data 1101 shown in FIG.
Transfer to the interface 410. When the compression ratio is twice the normal value, as shown in FIG. 11B, the composite data 1102 in which the number of bits of the compressed data portion of the composite data 1101 is halved is generated. Transfer to

The DAC interface 410 receives a switching signal from the word clock switching device 425 separately from the mixed data transferred from the mixed data generating device 409. The word clock switching device 425 receives the compression ratio data from the memory controller 406,
When the compression rate is normal, the word clock 1201 shown in FIG. 12A is generated. When the compression rate is twice the normal rate, the word clock 1202 shown in FIG.
Generate From the DAC interface 410, a bit clock, data having a different data length according to the compression ratio, and a word clock whose word length changes according to the compression ratio of the compressed data are transmitted to the D / A converter 412 and the ADC interface 411. .

The system controller 422 receives the compression ratio data from the system controller 421 and communicates word clock information transferred from the DAC interface 410 to the ADC interface 411 through the word clock switching device 426. The ADC interface 411 can correctly extract data in word units even if the word clock changes at the compression rate of the compressed data. When the compression ratio of the compressed data changes, the data amount of the compressed data changes in units of one frame. In the present embodiment, when the compressed data having different compression ratios are mixed and transferred, the word length of the mixed data is made variable according to the compression ratio, so that the compression can be performed even when the data having the high compression ratio is transferred. Since the setting can be performed without adjusting to the word length of the low-rate data, efficient compressed data transfer can be performed. Further, in the present embodiment, data indicating the compression ratio of the compressed data to be transferred is recorded via the system controller.

As described above, according to the present embodiment, it is possible to use a single interface for compressed data and audio data, and also to reduce the compression rate when transferring data with a high compression rate. Since the setting can be made without adjusting to the word length of the data, efficient compressed data transfer is possible.

Although the present embodiment has been described here based on the first embodiment, the same effects can be obtained in the second and third embodiments by adding similar components. it can.

(Embodiment 5) FIG. 5 is a block diagram showing a configuration of a data transfer apparatus according to Embodiment 5 of the present invention.
FIG. 13 is a configuration diagram of mixed data obtained by duplicating compressed data according to the compression ratio of the compressed data according to the fifth embodiment of the data transfer device of the present invention.

Disk 501 and magnetic head 50 shown in FIG.
2, optical pickup 503, RF amplifier 504, signal processing unit 505, memory controller 506, anti-vibration memory 5
07, decompression processing device 508, D / A converter 512,
Compressed data generator 513, anti-vibration memory 514, memory controller 515, signal processor 516, RF amplifier 5
17, the optical pickup 518, the magnetic head 519, and the disk 520 are the disk 401, the magnetic head 402, the optical pickup 403, the RF amplifier 404, the signal processing unit 405, the memory controller 506, the vibration-proof memory 407, and the decompression processing device 408 shown in FIG. , D / A converter 41
2, compressed data generation device 413, anti-vibration memory 414, memory controller 415, signal processing unit 416, RF amplifier 417, optical pickup 418, magnetic head 419,
The same operations as those of the disk 420 are performed, and the DAC interfaces 510 and A shown in FIG.
The DC interface 511 performs the same operations as the DAC interface 110 and the ADC interface 111 shown in FIG. 1, respectively, and thus the detailed description thereof is omitted, and the operation of other components will be described here.

The compressed data multiplexing switching device 524 receives the compression rate data of the transfer compressed data from the memory controller 506 from the memory controller 506, and outputs a multiplexing switching signal indicating whether the compression rate is normal or double the normal data. Output to the generating device 509 and the mixed data generating device 5
09 receives the multiplex switching signal. If the multiplex switching signal indicates a normal compression rate, the multiplexing unit generates the composite data 1301 shown in FIG. 13A and transfers it to the DAC interface 510. When the multiplex switching signal indicates a compression rate twice as high as that of the normal mode, as shown in FIG. 13B, the hybrid data 1302 is generated using the duplexed compressed data and the audio data, and the hybrid data 1302 is generated. 1
Transfer in the same way as 301. The mixed data 1301 and the mixed data 1302 have the same word length. The system controller 522 obtains the compression rate data of the transfer compression data through the system controller 521 and outputs an operation switching signal to the multiplexed data comparison device 525.

The multiplexed data comparison device 525 checks the operation switching signal when mixed data is transferred from the ADC interface 511 in units of 512 words. When the operation switching signal has the logical value “L”, the mixed data is transferred to the compressed data generator 513 as it is in units of 512 words. However, the operation switching signal compares the lower 4 bits of the mixed data, that is, the duplicated portion of the compressed data. The duplicated data are sequentially compared, and if they all match, the mixed data of 512 words is directly transferred to the compressed data generation device 513. However, if there is unmatched data, it is determined that an error has occurred during data transfer, and an error occurrence signal is sent to the system controller 522.
After that, the system controller 522 performs error processing.

As described above, according to the present embodiment, the compressed data is multiplexed in accordance with the compression ratio of the input compressed data and the word length of the mixed data, and the multiplexed compressed data and the audio data are multiplexed. Since mixed data is generated, an error during data transfer can be detected by, for example, comparing multiplexed data, and more reliable transfer of compressed data can be realized.

Generally, audio data compression / expansion processing is described in a program with the contents of the processing, and is described in DS.
P (Digital Signal Processo)
Although the processing is performed by r), the processing contents of the decompression processing device and the mixed data generation device in each of the embodiments of the present invention can be similarly performed by the DSP. In this case, by providing an operation switching signal from the outside, both the normal compression / expansion processing, the dubbing operation of the compressed data, and the monitoring function can be performed by one DSP. This makes it possible to reduce the number of input / output terminals, thereby contributing to cost reduction. In addition, when performing high-speed data transfer, it is possible to reduce the power used for decompression processing.

[0049]

As described above, according to the present invention, there is obtained an advantageous effect that the dubbing operation of the compressed data and the monitoring of the transfer data can be simultaneously and efficiently performed.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a data transfer device according to a first embodiment of the present invention;

FIG. 2 is a block diagram illustrating a configuration of a data transfer device according to a second embodiment of the present invention;

FIG. 3 is a block diagram showing a configuration of a data transfer device according to a third embodiment of the present invention;

FIG. 4 is a block diagram illustrating a configuration of a data transfer device according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a data transfer device according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram of mixed data according to the first embodiment of the data transfer device of the present invention;

FIG. 7 is an explanatory diagram of output signals of a DAC interface according to the first embodiment of the data transfer device of the present invention.

FIG. 8 is an explanatory diagram of compressed data transfer timing and decompression processing timing in a data transfer device according to a second embodiment of the present invention.

FIG. 9 is an explanatory diagram of a data transfer speed and a read operation timing in the data read device according to the second embodiment of the data transfer device of the present invention.

FIG. 10 is an explanatory diagram of an intermittent operation timing of a decompression process in a data transfer device according to a third embodiment of the present invention.

FIG. 11 is a configuration diagram of mixed data according to a compression ratio of compressed data in a data transfer device according to a fourth embodiment of the present invention.

FIG. 12 is an explanatory diagram of a word clock that changes according to a compression ratio of compressed data in a data transfer device according to a fourth embodiment of the present invention.

FIG. 13 is a configuration diagram of mixed data obtained by duplicating compressed data according to the compression ratio of the compressed data in the fifth embodiment of the data transfer device of the present invention.

FIG. 14 is a block diagram showing a configuration of a conventional data transfer device.

[Explanation of symbols]

 101, 120 Magneto-optical disk 102, 119 Magnetic head 103, 118 Optical pickup 104, 117 RF amplifier 105, 116 Signal processing unit 106, 115 Memory controller 107, 114 Vibration-proof memory 108 Decompression processing device 109 Hybrid data generation device 110 DAC interface 111 ADC interface 112 D / A converter 113 Compressed data generator

Claims (7)

[Claims] A decompression processing device for decompressing input compressed data in predetermined word units to obtain audio data;
A hybrid data generating device for generating hybrid data of a predetermined word length using the audio data obtained from the decompression processing device and the compressed data of the predetermined word unit, and outputting the hybrid data in a predetermined word unit. Data transfer device. 2. An audio data reading device for intermittently reading and outputting the audio data of the mixed data output from the mixed data generating device according to a transfer speed of the mixed data. The data transfer device according to claim 1. 3. The data transfer device according to claim 2, wherein the decompression processing device performs the decompression process of the input compressed data intermittently according to a transfer speed of the input compressed data. 4. The hybrid data generation device determines the number of bits per word of the compressed data constituting the hybrid data so that the word length of the hybrid data is minimized in accordance with the compression ratio of the input compressed data. 4. The data transfer device according to claim 1, wherein the data transfer device is variable. 5. A hybrid data generating device multiplexes the compressed data according to a compression ratio of the input compressed data and a word length of the hybrid data, and generates hybrid data from the multiplexed compressed data and the audio data. 4. The data transfer device according to claim 1, wherein the data is transferred. 6. The hybrid data generating device determines the number of bits per word of the audio data constituting the hybrid data so that the word length of the hybrid data is minimized in accordance with the transfer rate of the input compressed data. 4. The data transfer device according to claim 3, wherein said data transfer device is variable. 7. A hybrid data generating device multiplexes the compressed data according to a compression ratio of the input compressed data and a word length of the hybrid data, and generates hybrid data from the multiplexed compressed data and the audio data. 4. The data transfer device according to claim 1, wherein the data is transferred.