JP2007035168A - Data recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain the available capacity of a recording medium while increasing a recording speed. <P>SOLUTION: An encoder 31 in a compression processing part 30 executes first compression processing to content data read out by a disk player 11 and records temporarily the compressed data to an HDD 12, wherein the first compression processing can conduct high-speed compression. Then, a DSP 17 reads out the data, to which the first compression is applied, under the condition that a load on the DSP 17 is small. An encoder 41 in a compression processing part 40 executes second compression processing which is excellent in compression rate to realize high-speed recording while keeping the capacity of the HDD 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a data recording apparatus that records content data on a recording medium, and more particularly to a data recording apparatus that achieves both a high recording speed and a limited use capacity of the recording medium.

  2. Description of the Related Art In recent years, audio devices that record content data such as music data recorded on a CD or DVD once in an HDD and reproduce the data from the HDD are becoming widespread. In this case, content data is generally compressed and recorded in the HDD, but high-speed recording from the CD to the HDD is difficult due to the computing power of the processor that performs the compression.

  In order to improve this recording speed, for example, as disclosed in Patent Document 1, content data read from a CD is temporarily recorded in the HDD in an uncompressed state, and the uncompressed data on the HDD is available when there is a sufficient processor load. A technique has been devised in which data is read and compressed and then recorded again on the HDD.

Japanese Patent Laid-Open No. 2001-210007

  In the conventional technology, since the content data read from the CD is not compressed at the stage of recording on the HDD, the recording may be terminated at a speed about the original drive reading speed (for example, 32 times the playback speed). However, there is a problem that a huge amount of capacity is consumed when uncompressed data is recorded in the HDD.

  In particular, in-vehicle data recording devices have a limited HDD capacity, and are shared with the storage of various important information such as map data, so solving this problem has become a serious issue.

  The present invention has been made to solve the above-mentioned problems in the prior art and to solve the problems, and provides a data recording apparatus that achieves both high recording speed and low recording medium usage capacity. With the goal.

  In order to solve the above-described problems and achieve the object, a data recording apparatus according to the invention of claim 1 is a data recording apparatus for recording content data on a recording medium, the acquisition means for acquiring the content data, First compression processing is performed on the content data acquired by the acquisition unit to create first compressed data, and the first compression processing unit records the information on the recording medium. And second compression processing means for generating second compressed data by performing second compression processing and recording the second compressed data on the recording medium.

  According to the first aspect of the present invention, the data recording apparatus performs the first compression processing on the acquired content data to create the first compressed data, and once records the data on the recording medium, the first compression is performed. A second compression process is performed on the data to create second compressed data, which is recorded on a recording medium.

  According to a second aspect of the present invention, there is provided the data recording apparatus according to the first aspect, wherein the second compression processing has a higher compression ratio than the first compression processing.

  According to the second aspect of the present invention, the data recording apparatus performs low-compression compression processing on the acquired content data to create low-compression data, and once records the data on the recording medium, Then, a compression process with a high compression rate is performed and recorded on a recording medium.

  According to a third aspect of the present invention, in the data recording apparatus according to the first or second aspect, the first compression processing is lossless compression.

  According to the third aspect of the present invention, the data recording apparatus performs reversible compression processing on the acquired content data, temporarily records it on the recording medium, and then performs compression processing again to record on the recording medium.

  According to a fourth aspect of the present invention, in the data recording device according to the first, second, or third aspect, the second compression processing means stores the second compressed data in the recording medium. Then, the first compressed data is erased.

  According to the fourth aspect of the present invention, the data recording apparatus performs a first compression process on the acquired content data to create first compressed data, and once records the data on the recording medium, the first compression is then performed. The second compression processing is performed on the data to create second compressed data, which is recorded on the recording medium and the first compressed data is deleted.

  According to a fifth aspect of the present invention, there is provided a data recording apparatus according to any one of the first to fourth aspects, wherein the content data is uncompressed when the free space of the recording medium is a predetermined amount or more. After the recording on the recording medium, the second compression processing is performed, and when the free space of the recording medium is less than a predetermined amount, the content data is converted into the first compressed data and stored in the recording medium. The second compression processing is performed after storing.

  According to the fifth aspect of the present invention, the data recording device performs the second compression process after the content data is recorded on the recording medium in a non-compressed manner when the free capacity of the recording medium is equal to or larger than a predetermined amount. If the free space is less than the predetermined amount, the content data is converted into the first compressed data and stored in the recording medium, and then the second compression process is performed.

  According to a sixth aspect of the present invention, there is provided a data recording apparatus according to the fifth aspect of the present invention, wherein an area for recording the content data in an uncompressed manner is secured in advance on the recording medium.

  According to the sixth aspect of the present invention, the data recording apparatus performs the second compression processing after the content data is recorded on the recording medium without compression within the range of the capacity secured in advance, and exceeds the capacity secured in advance. After the content data is converted into the first compressed data and stored in the recording medium, the second compression processing is performed.

  According to a seventh aspect of the present invention, there is provided a data recording apparatus according to any one of the first to sixth aspects, wherein the first compressed data, the second compressed data, and / or Alternatively, it is characterized by further comprising reproducing means for reproducing uncompressed content data.

  According to the seventh aspect of the invention, the data recording apparatus compresses the acquired content data in two stages and records it on the recording medium, and reproduces the recorded data.

  According to an eighth aspect of the present invention, in the data recording apparatus according to the seventh aspect of the present invention, the second compression processing means includes the first compressed data recorded on the recording medium and / or the uncompressed data. The content data is characterized in that the second compression processing is performed with priority given to data with low reproduction frequency.

  According to the eighth aspect of the present invention, the data recording apparatus performs the second compression process on the first compressed data and the non-compressed content data recorded on the recording medium with priority given to data with low reproduction frequency.

  According to a ninth aspect of the present invention, there is provided the data recording apparatus according to the seventh or eighth aspect, wherein the reproducing means performs the first compression when reproducing the data simultaneously with the first compression processing. The compressed data created by the processing is read and used.

  According to the ninth aspect of the invention, the data recording apparatus records the content data by performing the first compression processing, and reads and reproduces the compressed data.

  According to a tenth aspect of the present invention, there is provided the data recording apparatus according to any one of the first to ninth aspects, wherein the second compression processing means is configured to perform the second compression when a processing load is small. Processing is performed.

  According to the tenth aspect of the present invention, the data recording apparatus performs the second compression process when the processing load is small after recording the obtained content data by performing the first compression process.

  According to an eleventh aspect of the present invention, there is provided the data recording device according to any one of the first to tenth aspects, wherein the acquisition means is an optical disk reproducing device, an electric memory device, a magnetic disk device, or a broadcast. The content data is obtained from any one of media.

  According to the eleventh aspect of the present invention, the data recording apparatus performs the first compression process on the content data acquired from the optical disk reproducing apparatus, the electric memory apparatus, the magnetic disk apparatus, the broadcast media, etc. After data is created and once recorded on the recording medium, the second compressed data is created by performing a second compression process on the first compressed data and recorded on the recording medium.

  A data recording apparatus according to a twelfth aspect of the present invention is the data recording apparatus according to any one of the first to eleventh aspects, wherein the acquisition unit performs the first compression from the apparatus including the first compression processing unit. Data is acquired and recorded on the recording medium.

  According to the twelfth aspect of the present invention, the data recording apparatus acquires the first compressed data from the apparatus including the first compression processing means, records it on the recording medium, and then executes the second compression process.

  A data recording apparatus according to a thirteenth aspect of the present invention is the data recording apparatus according to any one of the first to twelfth aspects, wherein the recording medium is any one of a magnetic disk, an optical disk, and an electrical memory. It is characterized by.

  According to the thirteenth aspect of the invention, the data recording apparatus performs the compression process in two stages when the acquired content data is recorded on a recording medium such as a magnetic disk, an optical disk, or an electric memory.

  A data recording apparatus according to a fourteenth aspect of the present invention is the data recording apparatus according to any one of the first to thirteenth aspects, comprising a plurality of the recording media, the first compressed data and the second compressed data. Are recorded on different recording media.

  According to the fourteenth aspect of the present invention, the data recording apparatus compresses the acquired content data in two stages, and records the first stage compressed data and the second stage compressed data on different recording media.

  According to the first aspect of the present invention, the data recording apparatus performs the first compression process on the acquired content data to create the first compressed data, and once records it on the recording medium, the first compressed data Therefore, the second compression process is performed to create the second compressed data and record it on the recording medium. Therefore, it is possible to obtain a data recording apparatus that achieves both higher recording speed and reduced use capacity of the recording medium. There is an effect that can be done.

  According to the second aspect of the present invention, the data recording apparatus performs low-compression compression processing on the acquired content data to create low-compressed data, and once records the data on the recording medium, the data is then converted into the low-compressed data. On the other hand, since a high compression rate compression process is performed and recording is performed on the recording medium, there is an effect that it is possible to obtain a data recording apparatus that achieves both higher recording speed and reduced use capacity of the recording medium.

  Further, according to the invention of claim 3, the data recording apparatus performs lossless compression processing on the acquired content data and once records it on the recording medium, and then performs compression processing again and records on the recording medium. There is an effect that it is possible to obtain a data recording apparatus that achieves both a high recording speed and a reduced use capacity of the recording medium while preventing a decrease in sound quality.

  According to a fourth aspect of the present invention, the data recording apparatus performs a first compression process on the acquired content data to create first compressed data, and once records it on a recording medium, Data that effectively suppresses the used capacity of the recording medium because the second compression processing is performed on the compressed data to create the second compressed data, which is recorded on the recording medium and the first compressed data is deleted. The recording apparatus can be obtained.

  According to a fifth aspect of the present invention, the data recording apparatus performs the second compression process after recording the content data on the recording medium in a non-compressed manner when the free capacity of the recording medium is equal to or larger than a predetermined amount, and the recording medium Is less than the predetermined amount, the content data is converted into the first compressed data and stored in the recording medium, and then the second compression process is performed. Therefore, the recording speed is set according to the free capacity of the recording medium. There is an effect that it is possible to obtain a data recording device that changes the priority order of the consumption capacity.

  According to the invention of claim 6, the data recording apparatus performs the second compression processing after recording the content data on the recording medium without compression within the range of the capacity secured in advance, and exceeds the capacity secured in advance. In this case, since the second compression processing is performed after the content data is converted into the first compressed data and stored in the recording medium, the data recording for changing the priority order of the consumption capacity of the recording speed in accordance with the usage status of the recording medium There exists an effect that an apparatus can be obtained.

  According to the seventh aspect of the invention, the data recording apparatus compresses the acquired content data in two stages and records it on the recording medium, and reproduces the recorded data. There is an effect that it is possible to obtain a data recording device that achieves both the use capacity suppression and the data reproduction function.

  According to the eighth aspect of the present invention, the data recording apparatus performs the second compression process on the first compressed data and the non-compressed content data recorded on the recording medium, giving priority to data with low reproduction frequency. Therefore, there is an effect that it is possible to obtain a data recording apparatus that appropriately suppresses the usage capacity of the recording medium in accordance with the data usage state.

  According to the ninth aspect of the present invention, the data recording apparatus records the content data by performing the first compression processing, and reads out and reproduces the compressed data, so that the recording speed is increased and the recording medium is recorded. Thus, there is an effect that it is possible to obtain a data recording apparatus that can simultaneously reduce the used capacity and can simultaneously perform data recording and reproduction.

  According to the tenth aspect of the invention, the data recording apparatus performs the second compression process when the processing load is small after recording the obtained content data after performing the first compression process. There is an effect that it is possible to obtain a data recording apparatus that can effectively increase the recording speed and suppress the use capacity of the recording medium by effectively utilizing the capability.

  According to the eleventh aspect of the present invention, the data recording apparatus performs a first compression process on content data acquired from an optical disk reproducing apparatus, an electric memory apparatus, a magnetic disk apparatus, a broadcast medium, etc. Since the compressed data is created and once recorded on the recording medium, the second compressed data is created on the first compressed data to create the second compressed data and recorded on the recording medium. There is an effect that it is possible to obtain a data recording apparatus that achieves both high-speed recording on the recording medium and low usage capacity for the acquired data.

  According to the invention of claim 12, the data recording apparatus acquires the first compressed data from the apparatus having the first compression processing means, records the first compressed data on the recording medium, and then executes the second compression processing. Therefore, there is an effect that it is possible to obtain a data recording apparatus that uses both the functions of the external apparatus and achieves both high recording speed and low recording medium usage capacity.

  According to the thirteenth aspect of the invention, the data recording apparatus performs the compression process in two stages when recording the acquired content data on a recording medium such as a magnetic disk, an optical disk, or an electric memory. There is an effect that it is possible to obtain a data recording apparatus that achieves both high recording speed and low use capacity of the recording medium with respect to recording.

  According to the fourteenth aspect of the invention, the data recording apparatus compresses the acquired content data in two stages, and records the first stage compressed data and the second stage compressed data on different recording media. There is an effect that it is possible to obtain a data recording apparatus that can change the recording medium as appropriate to achieve both higher recording speed and lower usage capacity of the recording medium.

  Exemplary embodiments of an in-vehicle audio apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic configuration diagram showing a schematic configuration of an in-vehicle audio apparatus according to an embodiment of the present invention. As shown in the figure, the in-vehicle audio apparatus 1 includes a disc player 11, an HDD 12, a switch 13, an operation input unit 14, a display output unit 15, a control unit 16, a DSP 17, a memory 18, a DAC 19, an amplifier 20, and a speaker 21 therein. Have.

  The disc player 11 is a device that reads recorded contents (music data in this case) from a recording medium such as a CD (Compact Disc) or a DVD, and the switch 13 sets the output destination of the data read from the disc player 11 to the DSP 17 and the DAC 19. Switch to one. An HDD (Hard Disk Drive) is a recording device that records data on a magnetic disk.

  The operation input unit 14 is an input interface that receives an operation input from the user, and the display output unit 15 is an output interface that performs display output on a display or the like.

  The control unit 16 performs switching of the switch 13 and operation control of the DSP 17 based on an operation input from the user or autonomously. A DSP (Digital Signal Processor) 17 is processing means for performing processing such as data compression and decompression, and a memory 18 is a recording medium for electrically recording information.

  A DAC (Digital / Analog Converter) 19 converts the digital data read from the disk player 11 or the digital data output by the DSP 17 into an analog signal and outputs the analog signal to the amplifier 20. The analog signal is amplified by the amplifier 20 and then output from the speaker 21.

  In this in-vehicle audio apparatus 1, when reproducing music data read by the disc player 11, the output of the disc player 11 is directly sent to the DAC 19 by switching the switch 13.

  On the other hand, when the music data read by the disc player 11 is recorded in the HDD 12, the output of the disc player 11 is sent to the DSP 17. The DSP 17 records the output of the disk player 11 as it is (uncompressed) in the HDD 12 or performs compression processing and records it in the HDD 12.

  If the music data read by the disc player 11 is compressed and recorded in the HDD 12, the data size can be reduced and the capacity consumption of the HDD 12 can be suppressed. However, since it takes time for the processor to execute the compression process, the recording speed becomes slow.

  On the other hand, if the read music data is recorded in the HDD 12 uncompressed, the recording speed is high (the maximum reading speed of the disc player), but the data size is large, and thus the capacity of the HDD 12 is consumed in large quantities. Even when compression is performed after storage without compression, a problem of capacity consumption of the HDD occurs when the uncompressed data is stored in the HDD 12.

  Therefore, the in-vehicle audio apparatus 1 performs first compression processing on the uncompressed data read from the disc player 11 to create first compressed data, and once records the first compressed data in the HDD 12. Then, the first compressed data is read from the HDD 12 and the second compression processing is performed to create the second compressed data, which is recorded again in the HDD 12.

  Therefore, the DSP 17 includes a compression processing unit 30 that executes the first compression and a compression processing unit 40 that executes the second compression processing. The compression processing unit 30 includes an encoder 31 used when compressing data and a decoder 32 used when decompressing data. The compression processing unit 40 includes an encoder 41 used when compressing data and a decoder used when decompressing data. 42 is provided. The encoders 31 and 41 and the decoders 32 and 42 may be the same functional unit that can vary the compression / decompression rate.

  It is assumed that the first compression by the compression processing unit 30 has a lower compression rate and a higher processing speed than the second compression by the compression processing unit 40. Further, it is desirable that at least the first compression is a reversible compression. This is because if the first compression is lossless compression, the second compression can be executed after returning to the non-compressed data without impairing the sound quality.

  The operation of the in-vehicle audio apparatus 1 will be further described with reference to FIG. As shown in the figure, first, the content data D 0 read from the disc player 11 is compressed by the encoder 31 of the compression processing unit 30. The low-compression data D1 obtained as a result of compression by the encoder 31 is once recorded in the HDD 12.

  Thereafter, the DSP 17 reads the low-compression data D1, and the compression processing unit 40 compresses the data by the encoder 41. At this time, if the encoder 41 cannot directly compress the low-compression data D1, the encoder 41 performs compression after the compressed data D1 is decoded by the decoder 32 of the compression processing unit 30.

  Highly compressed data D2 obtained as a result of compression by the encoder 41 is recorded in the HDD 12. Further, since the low compression data D1 is unnecessary after the high compression data D2 is recorded, the low compression data D1 is deleted when the high compression data D2 is recorded on the HDD 12.

  It is desirable that the compression by the encoder 41 is executed by selecting when the load on the DSP 17 is small. Specifically, when the in-vehicle audio apparatus 1 is not reproducing music data, when performing reproduction without going through the DSP 17, or when outputting music that does not require processing by the DSP 17 such as a radio, For example, when the device 1 is in a non-operating state, or when the ACC switch of the vehicle is off, etc. are suitable.

  By the way, when the content data D0 is recorded on the HDD 12, the compression by the encoder 31 is not always necessary. When the HDD 12 has a sufficient free space, uncompressed data is recorded, and the free space of the HDD 12 is small. May be compressed by the encoder 31.

  For example, when the free capacity of the HDD 12 is equal to or larger than a predetermined amount, compression is performed by the encoder 41 after recording in the HDD 12 without compression, and when the free capacity of the HDD 12 is less than the predetermined amount, the encoder 31 converts the data into low-compressed data. After conversion and storage in the HDD 12, compression by the encoder 41 may be performed.

  In addition, an area for recording content data in the HDD 12 in an uncompressed manner is secured in advance, and recording is performed in the HDD 12 in an uncompressed state until the area is full, and after the area secured in advance is full, the encoder 31 is recorded. May be converted into low-compressed data and stored in the HDD 12.

  Note that the size of the uncompressed recording area secured in the HDD 12 may be arbitrarily designated by the user, or may be selected from a preset pattern.

  In selecting low-compressed data or non-compressed data to be compressed by the encoder 41, priority is given to data with low reproduction frequency among the low-compressed data and non-compressed data recorded in the HDD 12. In this way, data that is frequently used can be stored with high sound quality by preferentially converting data that is reproduced less frequently into high-compression data.

  The reproduction frequency may be, for example, the number of reproductions in a predetermined period (for example, the most recent month), or may be recompressed from a period that has passed a predetermined period (for example, one month) since the last reproduction. Also, you may not recompress for a certain period of time (for example, 3 months) after the first recording (for example, you purchased a new CD and recorded it, but you have no time to listen to it, so you should listen once) Can be prevented from being recompressed without the

  Next, processing when the reproduction and recording of the music data read by the disc player 11 are executed simultaneously will be described. As described above, when only reproduction is executed, the output of the disk player 11 is directly sent to the DAC 19. However, when reproduction and recording are executed simultaneously, as shown in FIG. Send output to DSP 17.

  The DSP 17 first compresses the content data D 0 by the encoder 32 of the compression processing unit 30 to create low-compression data D 1 and records it in the memory 18. Thereafter, the low-compression data D1 is read out, decoded by the decoder 32, and output to the DAC 19.

  The low-compressed data recorded in the memory 18 is converted into high-compressed data D2 by the encoder 42 and recorded in the HDD 12 after the load on the DSP 18 is reduced.

  As described above, the content data D0 is once converted into the low-compressed data D1, and then encoded and output, whereby data recording and reproduction can be performed simultaneously. In this case, it is preferable to record the low-compression data D1 in the memory 18 that can be read and written at a higher speed than the HDD 12.

  By the way, some disc players have their own encoders and decoders. When such a disc player is used, low-compression data may be created using the encoding function of the disc player.

  FIG. 4 shows a schematic configuration of an in-vehicle audio apparatus 1a provided with an encoder in the disc player. As shown in the figure, the disc player 11 a in the in-vehicle audio apparatus 1 a includes a compression processing unit 50, and the compression processing unit 50 includes an encoder 51 and a decoder 52.

  The DSP 17a includes only the compression processing unit 40 here, but may further include the compression processing unit 30 as in the configuration shown in FIG. The control unit 16a controls the compression processing failure 50 of the disc player 11a in addition to the control of the switch 13 and the DSP 17a.

  Since other configurations and operations are the same as those of the audio apparatus 1 shown in FIG. 1, the same components are denoted by the same reference numerals and description thereof is omitted.

  Next, the operation of the audio device 1a will be described with reference to FIG. As shown in the figure, first, the encoder 51 of the compression processing unit 50 compresses the content data D0 inside the disc player 11a. Then, the low-compression data D1 obtained as a result of compression by the encoder 51 is temporarily recorded on the HDD 12 via the DSP 17a. Further, the HDD 12 may transmit the data directly from the encoder 50 to the encoder 40 without recording the low-compression data D1. Alternatively, the compression processing unit 40 may record the low-compression data D2 after recording the low-compression data in the memory 18. May be recorded.

  Thereafter, the DSP 17a reads the low-compression data D1, and the compression processing unit 40 compresses the data by the encoder 41. High compression data D2 obtained as a result of compression by the encoder 41 is recorded in the HDD 12, and the low compression data D1 is deleted.

  As described above, the in-vehicle audio apparatus according to the present embodiment records the content data on the recording medium once in the first compressed state, and then converts the content data into the second compressed state. The use capacity of the recording medium can be reduced.

  As the compression format, the first compression and the second compression may be performed by changing the compression rate of the same format, or different compression formats such as MP3 and ATRAC may be adopted.

  If the processing load and the compression rate are variable for the first compression, it is preferable to appropriately set the recording speed to be maximum.

  In this embodiment, music data is taken as an example of content data. However, the present invention can be used for arbitrary content data such as moving image data.

  The content data can be acquired from any device such as a CD playback device, a DVD playback device, an MD, a cassette tape, an electric memory device, or a magnetic disk device. Moreover, you may acquire from broadcast media, such as not only a recording medium but TV, radio.

  Furthermore, any recording medium such as a magnetic disk, a CD, a DVD, an electric memory, or another recording device connected to the outside can be used as the recording destination of the compressed data.

  As described above, the data recording apparatus according to the present invention is effective for recording content data, and is particularly suitable for increasing the recording speed and suppressing the usage capacity of the recording medium.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows the schematic structure of the vehicle-mounted audio apparatus concerning the Example of this invention. It is explanatory drawing explaining operation | movement of the vehicle-mounted audio apparatus shown in FIG. It is explanatory drawing explaining the operation | movement in the case of performing recording and reproduction | regeneration simultaneously. It is a schematic block diagram which shows schematic structure of the vehicle-mounted audio apparatus which has an encoder in a disc player. It is explanatory drawing explaining operation | movement of the vehicle-mounted audio apparatus shown in FIG.

Explanation of symbols

1, 1a Car audio system 11, 11a Disc player 12 HDD
13 switch 14 operation input unit 15 display output unit 16, 16a control unit 17, 17a DSP
18 memory 19 DAC
20 Amplifier 21 Speaker 30, 40, 50 Compression processing unit 31, 41, 51 Encoder 32, 42, 52 Decoder

Claims (14)

A data recording apparatus for recording content data on a recording medium,
Obtaining means for obtaining the content data;
First compression processing means for performing first compression processing on the content data acquired by the acquisition means to create first compressed data and recording the first compressed data on the recording medium;
Second compression processing means for performing second compression processing on the first compressed data to create second compressed data, and recording the second compressed data on the recording medium;
A data recording apparatus comprising:   The data recording apparatus according to claim 1, wherein the second compression process has a higher compression rate than the first compression process.   The data recording apparatus according to claim 1, wherein the first compression processing is lossless compression.   4. The data according to claim 1, wherein the second compression processing unit erases the first compressed data after storing the second compressed data in the recording medium. 5. Recording device.   When the free space of the recording medium is greater than or equal to a predetermined amount, the second compression process is performed after the content data is recorded on the recording medium without compression, and the free space of the recording medium is less than the predetermined amount 5. The data according to claim 1, wherein the second compression processing is performed after the content data is converted into first compressed data and stored in the recording medium. Recording device.   6. The data recording apparatus according to claim 5, wherein an area for recording the content data without compression is secured in advance on the recording medium.   7. The reproduction apparatus according to claim 1, further comprising reproduction means for reproducing the first compressed data, the second compressed data and / or the uncompressed content data recorded on the recording medium. The data recording device described in 1.   The second compression processing means performs the second compression processing on the first compressed data and / or uncompressed content data recorded on the recording medium with priority given to data with low reproduction frequency. 8. The data recording apparatus according to claim 7, wherein   9. The reproduction means according to claim 7, wherein the reproduction means reads and uses the compressed data created by the first compression process when reproducing the data simultaneously with the first compression process. Data recording device.   The data recording apparatus according to claim 1, wherein the second compression processing unit performs the second compression processing when a processing load is small.   The data according to any one of claims 1 to 10, wherein the acquisition unit acquires the content data from any one of an optical disk playback device, an electric memory device, a magnetic disk device, and a broadcast medium. Recording device.   The data according to any one of claims 1 to 11, wherein the acquisition means acquires first compressed data from an apparatus including first compression processing means and records the first compressed data on the recording medium. Recording device   The data recording apparatus according to claim 1, wherein the recording medium is any one of a magnetic disk, an optical disk, and an electric memory.   The data recording apparatus according to claim 1, wherein a plurality of the recording media are provided, and the first compressed data and the second compressed data are recorded on different recording media.

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