JP3604036B2 - Data recording device - Google Patents

Description

  The present invention relates to a data processing apparatus suitable for use in recording and reproducing video data and audio data on a magneto-optical disk, for example, by compressing and expanding the data.

  2. Description of the Related Art Recently, a mini disk (MD) device for compressing and recording digital audio data on a magneto-optical disk (mini disk) (trademark) has become widespread. FIG. 6 shows an example of the configuration of the mini disk device.

  The mini disk (magneto-optical disk) 3 is housed in the cartridge 2 and is rotated by the spindle motor 1. When the mini disc 3 is mounted on the apparatus main body, an optical pickup 4 having an objective lens 5 and a magnetic head 6 are arranged so as to face each other with the mini disc 3 interposed therebetween. The magnetic head 6 and the optical pickup 4 are connected by a connecting member (not shown), and are transported in the radial direction of the mini-disc 3 by a feed motor 7.

  When the key 20 is operated to instruct, for example, a recording operation, the system controller 18 drives the spindle motor 1 via the servo control circuit 8 to rotate the mini disk 3 at a predetermined speed. Further, the servo control circuit 8 controls the optical pickup 4, emits a laser beam from a built-in laser diode, and irradiates the mini disk 3 via the objective lens 5. The laser beam reflected by the mini-disc 3 enters the optical pickup 4 via the objective lens 5 and is received by a built-in photodetector.

  A pre-groove is formed on the mini-disc 3, and an address is recorded by meandering the pre-groove at a predetermined frequency. An RF signal output from a photodetector of the optical pickup 4 is input to an address decoder 17 via an RF amplifier 16, and the address decoder 17 decodes an address from a signal corresponding to the pregroove. The decoded address is supplied to the encoder / decoder 13. The encoder / decoder 13 reads a sector and other addresses from the input address, and encodes the data into a predetermined format as described later.

  Further, the servo control circuit 8 generates a focus error signal, a tracking error signal, a thread error signal, and the like from the signal output from the RF amplifier 16, and controls the optical pickup 4 in accordance with the focus error signal, the tracking error signal, and the like. Execute thread servo.

  The analog audio signal is input to the A / D converter 9 and converted into 16-bit digital audio data per sample at a sampling frequency of, for example, 44.1 kHz. The digital audio data output from the A / D converter 9 is input to an audio compression encoder / decoder 10 and is encoded (encoded) by a predetermined method (ATRAC (Adaptive Transform Acoustic Coding) method).

  In the encoder / decoder 10, the input digital audio data is divided into a high frequency component of 11 kHz to 22 kHz, a middle frequency component of 5.5 kHz to 11 kHz, and a low frequency component of 0 kHz to 5.5 kHz. , Each frequency component is subjected to MDCT (Modified Discrete Cosine Transform) and compressed. As described above, by dividing the frequency band into three, it is possible to suppress a pre-echo that is likely to occur in the DCT operation.

  The data encoded (encoded) by the encoder / decoder 10 is supplied via a memory controller 11 to a DRAM 12 having a capacity of, for example, 4 Mbits and temporarily stored. This DRAM 12 can store about three seconds of audio signals in real time. For this reason, even when the recording operation by the optical pickup 4 and the magnetic head 6 described later is temporarily interrupted due to a disturbance shock or the like, the audio signal input in real time is continuously stored. The recording signal can be prevented from being interrupted on the way.

  The data stored in the DRAM 12 is read out at a predetermined timing by the memory controller 11 and is input to the EFM and CIRC encoder / decoder 13. The encoder / decoder 13 performs EFM modulation on the input digital audio data as in the case of a compact disk (CD) or the like, and adds a code for error detection and correction. The data thus encoded by the encoder / decoder 13 is supplied to the head drive circuit 14, and the head drive circuit 14 supplies a drive signal corresponding to the input recording data to the magnetic head 6. The magnetic head 6 applies a vertical magnetic field to the mini disk 3 in response to the drive signal. As a result, data is recorded on the mini disc 3.

  FIG. 7 shows a recording format in the mini disc 3. As shown in the figure, one round of the mini disk 3 is divided into a plurality of sectors. Then, the encoder / decoder 13 records the digital audio data compressed by using the 36 sectors as one cluster and using this cluster as a unit.

  As shown in the figure, of the 36 sectors constituting one cluster, the first three sectors are link sectors, and the next one sector is a sub data sector. In this sub data sector, sub data other than audio data is arranged. The link sector is an area for joining the preceding and succeeding clusters, and audio data is substantially recorded only in 32 sectors other than the link sector and the sub data sector.

  One sector is 2352 bytes (2352 bytes for data), and 11 sound groups are arranged in two consecutive sectors. One sound group has 424 bytes, in which audio data of the left channel and the right channel is arranged for a total of 512 samples (11.61 ms). Digital audio data is recorded in units of this sound group.

  When reproduction is commanded by operating the key 20, the system controller 18 controls the optical pickup 4 via the servo control circuit 8, and adjusts the intensity of the laser beam to the intensity for reproduction (which is lower than the intensity for recording). Strength). The optical pickup 4 outputs a signal corresponding to the laser beam reflected from the mini disc 3 to the encoder / decoder 13 via the RF amplifier 16. The encoder / decoder 13 decodes data with reference to the address position supplied from the address decoder 17. That is, while performing EFM demodulation, error detection and correction are performed, and the result is stored in the DRAM 12 via the memory controller 11.

  As described above, since data of about 3 seconds can be stored in the DRAM 12 in real time, the operation of reading data from the mini disk 3 by the optical pickup 4 is temporarily interrupted by disturbance or the like. Even in such a case, if the reading operation from the mini disc 3 can be resumed within three seconds, it is possible to prevent the reproduction signal from being interrupted halfway.

  The data read from the DRAM 12 by the memory controller 11 is supplied to the encoder / decoder 10, the compressed digital audio data is expanded, and the compressed digital audio data is supplied to the D / A converter 15 where it is D / A converted and converted into an analog audio signal. Is output as

  On the display unit 19, messages necessary for the recording / reproducing operation are displayed as needed.

  On the other hand, recording of video data and accompanying audio data on a magneto-optical disk or optical disk in accordance with the MPEG format has been proposed, for example, as a CD-I format. In the MPEG system, video data and audio data are compressed and recorded on a recording medium. FIG. 8 shows the principle of video data compression. As shown in the figure, for example, a GOP (group of pictures) is composed of a predetermined number of frames (7 frames in this example). The first frame of each GOP is an I picture, the next two frames are B pictures, the next one frame is a P picture, the next two frames are B pictures, and the last frame is a last picture. This is a P picture.

  An I picture is compressed using an intra-frame correlation. The data of the P picture is compressed using the inter-frame correlation with the temporally preceding I picture or P picture as a prediction image. Further, the B picture is compressed using inter-frame correlation, using a temporally preceding I picture or P picture and a temporally subsequent I picture or P picture as prediction images.

  That is, when a video signal is input in the order of frames 0 to 6 (FIG. 9A), each frame is encoded in the order of frames 0, 3, 1, 2, 6, 4, and 5 ( FIG. 9 (b). This is because a B picture involves prediction not only from a temporally preceding frame but also from a temporally succeeding frame. Therefore, if a P picture as a temporally succeeding predicted image is not decoded in advance, This is because the data of the B picture cannot be encoded. As a result, the transmitted video data (recorded on the recording medium) is in the order of frames 0, 3, 1, 2, 6, 4, and 5. Therefore, when this is reproduced from the recording medium and decoded, the order is frames 0, 3, 1, 2, 6, 4, 5 (FIG. 9 (c)).

  This is returned to the original order of frames 0, 1, 2, 3, 4, 5, and 6 (FIG. 9D), and this data is converted from a non-interlaced video signal to an interlaced video signal. Then, it can be displayed on an ordinary television receiver of, for example, the NTSC system (FIG. 9E).

  In the MPEG system, an audio signal accompanying a video signal can be encoded in Layer I or Layer II as shown in Table 1.

  Further, as shown in this table, a predetermined coding speed can be selected from among 14 types in each layer at any time. The sampling frequency of the audio signal is 44.1 kHz, which is the same as that in the case of the above-mentioned mini-disc, but the encoding speed can be selected at any time in this way.

Such MPEG video data and audio data are superimposed and converted into a predetermined format as an MPEG bit stream. Then, the data of the MPEG bit stream is converted into a recording format corresponding to a recording medium such as a CD and recorded on a CD (CD-I), and the data reproduced from the CD is converted into a format of the MPEG bit stream. Is converted and output. As described above, the data can be mutually used by various data processing devices configured to process the format of the MPEG bit stream.

  A format for recording data of the MPEG system on a CD is defined as a CD-I format. In the CD-I format, data is recorded in sector units. Each sector includes a header, a subheader, and a data field. The header and the subheader store a data format, a form type, and encoding information. The data format is classified into a video sector, an audio sector, or a data sector according to the format of the data recorded in the sector. That is, if the data to be recorded in the data field is video data, it is a video sector, and if it is audio data, it is an audio sector. For example, if it is data such as an application program, it is a data sector. Is done.

  The form (form 1 or 2) indicates the presence or absence of the error correction code of the data in the data field, and the sector of the form 1 includes the user data of 2048 bytes and the error correction code of 280 bytes. Also, the sector of form 2 does not include the error correction code, and as a result, it is possible to record 2324 bytes of user data.

  The encoding information indicates the encoding format of the sector. For example, the encoding format of the video sector includes image signal formats such as ΔYUV, CLUT, RGB, and the like. Can be identified. In the case of audio sectors, there are ADPCM formats of level A, level B and level C, and each level has a different compression ratio.

  In order to be able to record data of a natural moving image (full image) similar to a normal television image, two more formats are specified for the video sector. One is an MPEG video showing MPEG encoded data of a non-interlaced moving picture, and the other is an MPEG still picture format showing encoded data of an interlaced still picture. Furthermore, an MPEG audio format is specified for the audio sector. These MPEG video, MPEG still image and MPEG audio are all sector of form 2.

  In each sector, an MPEG stream is recorded so as to have compatibility between different data processing devices.

  The above-mentioned mini disc (MD) was originally developed for recording and reproducing audio data, but the format of the MD data is defined so that data other than audio data can be recorded and reproduced. . The MD data drive (MDD) corresponding to this MD data format is a system originally developed for use in personal audio equipment (portable, stationary, or in-vehicle type). Using a recording medium containing a possible MO (magneto-magnetic) disk or a hybrid (partial ROM) disk having a rewritable area and a read-only area in a cartridge, a magnetic field modulation is applied to the MO disk and the hybrid disk. Data is recorded by an overwrite recording method.

  Through the process of development as a personal audio device, integration of each circuit element and optimization of each mechanical component have been achieved, and the overall size and weight of the device have been reduced, and battery operation is possible due to low power consumption. Has been done. Furthermore, in addition to having the same storage capacity (120 Mbytes) as the existing 3.5-inch MO disk drive, and being capable of exchanging recording media, the mass-production effect makes it possible to compare with other MO disk drives. Thus, the manufacturing cost of the apparatus main body and the recording medium can be reduced, and the reliability has been sufficiently demonstrated based on the results of use as personal audio equipment.

  As described above, the MD data drive device can be used as a drive for various data processing devices. As described above, for example, a format as a mini-disc (MD) and video data and audio data by the MPEG method are used. Since the format is different from the format of the CD-I to be recorded, there is no compatibility. For this reason, there has been a problem that the mini-disc device cannot reproduce a disc in a format compatible with MD data, and cannot reproduce a music MD with a data drive device. Of course, if both circuits corresponding to the respective formats are provided, discs of either format can be played back, but this increases the cost.

  The present invention has been made in view of such a situation, and it is an object of the present invention to be able to record or reproduce data on a recording medium of a different format at low cost.

A first data recording apparatus according to the present invention comprises: input means for inputting audio data and video data; audio compression means for compressing audio data input by the input means; and video data input by the input means. Compression means for compressing audio data, writing means for writing compressed audio data or compressed video data to a recording medium, discrimination means for discriminating the type of recording medium, and storage of a program for storing a plurality of compression programs Means for recording the data inputted from the input means on the recording medium, when the discriminating means determines that the recording medium is a recording medium for recording compressed audio data and compressed video data, based on the discrimination result of the discriminating means. Select a predetermined compression program from among a plurality of compression programs, and Then, after the audio data is compressed by the audio compression means and the video data is compressed by the video compression means, the compressed audio data and the compressed video data are written on a recording medium, and the discrimination means Is determined to be a recording medium for compressed audio data, a predetermined compression program is selected from a plurality of compression programs based on the determination result of the determination means, and audio data is converted to audio data based on the predetermined compression program. And control means for controlling only the compressed audio data to be written on the recording medium after being compressed by the compression means.

A second data recording apparatus according to the present invention comprises: input means for inputting audio data and video data; audio compression means for compressing audio data input by the input means; and video data input by the input means. Compression means, compression means for writing compressed audio data or compressed video data on a recording medium, discrimination means for discriminating the type of recording medium, and mounting means for storing a plurality of compression programs. Reading means for reading a program from the type program storage medium and recording the data inputted from the input means on the recording medium, the discriminating means discriminates that the recording medium is a recording medium for recording compressed audio data and compressed video data. In the case, based on the determination result of the determination means, a plurality of A predetermined compression program is selected from the compression programs, and based on the predetermined compression program, the audio data is compressed by the audio compression means, and the video data is compressed by the video compression means. Is written in the recording medium, and when the determination unit determines that the recording medium is the recording medium for compressed audio data, based on the determination result of the determination unit, selects a predetermined compression program from a plurality of compression programs, And a control means for controlling such that only the compressed audio data is written to the recording medium after the audio data is compressed by the audio compression means based on a predetermined compression program.

In the first data recording apparatus of the present invention, audio data and video data are input, the input audio data is compressed, the input video data is compressed, and the compressed audio data or the compressed audio data is compressed. The recorded video data is written to a recording medium, the type of the recording medium is determined, a plurality of compression programs are stored, and when the input data is recorded on the recording medium, the recording medium records compressed audio data and compressed video data. If it is determined that the recording medium is a recording medium, a predetermined compression program is selected from a plurality of compression programs based on the determination result, and audio data is compressed and video data is compressed based on the predetermined compression program. After that, the compressed audio data and the compressed video data are If it is determined that the recording medium is a recording medium for compressed audio data, a predetermined compression program is selected from a plurality of compression programs based on the determination result, and the audio program is selected based on the predetermined compression program. After the data is compressed, control is performed such that only the compressed audio data is written to the recording medium.

In the second data recording device of the present invention, audio data and video data are input, input audio data is subjected to compression processing, input video data is subjected to compression processing, and compressed audio data or compressed audio data is input. When the video data is written to a recording medium, the type of the recording medium is determined, the program is read from a wearable program storage medium storing a plurality of compressed programs, and input data is recorded on the recording medium. If it is determined that the recording medium is a recording medium for recording compressed audio data and compressed video data, a predetermined compression program is selected from a plurality of compression programs stored in the wearable program storage medium based on the determination result. Audio data is compressed based on a predetermined compression program, and the video data is compressed. Is compressed, the compressed audio data and the compressed video data are written to a recording medium, and when it is determined that the recording medium is a recording medium for compressed audio data, a plurality of compression programs are used based on the determination result. A predetermined compression program is selected, and based on the predetermined compression program, after audio data is compressed, control is performed such that only the compressed audio data is written to the recording medium.

  According to the data processing device of the present invention, the program corresponding to the type of data recorded on the recording medium is loaded and processed, so that the circuit configuration can be simplified and the cost of the device can be reduced. It becomes.

  FIG. 1 is a perspective view showing the configuration of an embodiment of a magneto-optical disk recording / reproducing device (MD data drive device) to which the data processing device of the present invention is applied. The magneto-optical disk recording / reproducing device 31 is provided with an insertion hole 32 on a side surface thereof, from which the cartridge 2 described with reference to FIG. 6 can be mounted. As described with reference to FIG. 6, the cartridge 2 accommodates the mini disk 3.

  The magneto-optical disk recording / reproducing apparatus 31 is provided with a key 33 on the right side of the insertion hole 32 so that a predetermined command such as power on / off, reject, reset, and the like can be input. . Further, on the left side of the insertion hole 32, an infrared light receiving section 34 is provided, so that a command by infrared light emitted from the remote controller 35 is received.

  The magneto-optical disk recording / reproducing device 31 is connected to a telephone line via a cord 41. An audio signal is input from a microphone 43 via a cord 42 and an audio signal is output to a speaker 45 via a cord 44. Furthermore, a video signal can be supplied from a camera-integrated video tape recorder (VTR) 47 or the like via a cord 46, for example. Further, a video signal can be output to a television receiver 49 via the code 48. Further, the printer / reader 51 can be connected to the printer / reader 51 via the code 50. A predetermined signal is output to the printer / reader 51 so that the printer / reader 51 can print and input read data. ing.

  FIG. 2 is a block diagram showing the internal electrical configuration of the magneto-optical disk recording / reproducing device 31. The interface (I / F) 61 supplies data transmitted from the telephone line via the code 41 to the filter 62, removes unnecessary components, and outputs the data to the switch 63. Further, data input from the switch 63 via the filter 62 is output to the telephone line via the code 41.

  The filter 62 converts a signal output from the telephone line into a signal in a frequency band (for example, 300 Hz to 4 kHz) that can be transmitted via the telephone line. The switch 63 selects either a signal supplied from the microphone 43 or a signal supplied via a telephone line, and outputs the signal to the A / D and D / A converter 64. The signal supplied from the A / D and D / A converters 64 is switched to be output to the speaker 45, the telephone line, or both.

  The A / D and D / A converter 64 performs A / D conversion of the analog audio signal supplied from the switch 63 and supplies it to a DSP (Digital Signal Processor) 65, and a digital analog audio signal supplied from the DSP 65. Is D / A converted and output to the switch 63. The DSP 65 includes a memory (RAM) 66, and executes a predetermined process according to a program stored therein. The memory 66 stores data necessary for processing as needed.

  The video signal supplied from the VTR 47 is A / D converted by an A / D converter 67 and then supplied to a video processor 68. The video processor 68 performs a graphic editing process or the like on the input video data as necessary, and outputs the video data to the VRAM 70 for storage. The video data stored in the VRAM 70 is D / A-converted by the D / A converter 71, and then supplied to the television receiver 49 for display. An MPEG decoder 69 is supplied from an MD data drive device 76 (basically, as shown in FIG. 6, configured to be able to record and reproduce data on the mini-disc 3). The video data is made to be decoded. The video processor 68 also outputs and displays the video data decoded by the MPEG decoder 69 to the television receiver 49 via the VRAM 70 and the D / A converter 71.

  The infrared signal received by the light receiving unit 34 from the remote controller 35 is supplied to a microcomputer 74 via an interface (I / F) 72. The interface (I / F) 73 outputs a signal corresponding to a command from the key 33 to the microcomputer 74. The microcomputer 74 includes a RISC CPU 74a, a DMA controller (DMAC) 74b, an interrupt controller (INTC) 74c, and the like. A memory 75 is connected to the microcomputer 74 via a bus. The memory 75 has a program required for the processing operation of the DSP 65 and data for interpreting a signal input from the remote controller 35. Are stored. The microcomputer 74 is also connected to the printer / reader 51.

  The interface (I / F) 77 is equipped with a card RAM or a card ROM based on, for example, a standard such as PCMCIA, and the data is taken in as needed.

  Next, the operation will be described with reference to the flowchart of FIG. Now, when the cartridge 2 in which the mini disk 3 is accommodated is mounted on the MD data drive device 76, the microcomputer 74 first checks the format of the disk on which the MD data drive device 76 is mounted in step S1. Execute the processing for

  That is, as shown in FIG. 4, the mini-disc 3 is provided with a lead-in area in a predetermined area on the inner circumference and a lead-out area on the outermost circumference. A predetermined data can be recorded by the user between the lead-in area and the lead-out area. A user TOC area is provided on the innermost side of this area. The TOC data required by the user can be recorded at any time. In this user TOC area, in the case of a normal music MD, the address of the recorded music number is recorded, but in this embodiment, identification data corresponding to the format is further recorded in this user TOC area. It has been made to be.

  When the cartridge 2 is inserted into the MD data drive device 76, the microcomputer 74 reads the user TOC data and checks the format from the identification data. This identification data is described in an intermediate language program so that it can be interpreted even when the microcomputer 74 (RISC CPU 74a) is replaced with a different type (when a minidisk is mounted on a different model). I have.

  After checking the format from the identification data in this way, the microcomputer 74 proceeds to steps S2 to S4, reads the program corresponding to the identification data from the memory 75, and loads the program into the memory 66 of the DSP 65. As a result, the DSP 65 can perform a decompression process corresponding to the format attached to the MD data drive device 76. Therefore, the process proceeds to step S5, in which the DSP 65 executes the DSP process according to the program loaded in the memory 66.

  That is, when the mounted MD is a normal music MD (an audio signal is recorded) (MD format disc), the memory 66 executes the same function as the apparatus shown in FIG. Is loaded. In addition, when a disk of an MD data format is loaded, a program for executing the above-described MD data format processing is loaded.

  For example, when a normal music MD is mounted and a reproduction command is issued, the MD data drive device 76 reproduces data from the mounted mini disk 3 and supplies the data to the memory 66 for storage. The DSP 65 decompresses (decodes) the digital audio data stored in the memory 66 according to the program similarly stored in the memory 66. The data decoded by the DSP 65 is input to the A / D and D / A converter 64, and after being D / A converted, output to the speaker 45 via the switch 63 and emitted. Alternatively, the signal is output from the switch 63 to the telephone line via the filter 62 and the interface 61 as necessary.

  The mini disk 3 mounted on the MD data drive device 76 is a disk of an MD data compatible format in which video data and audio data are compressed and recorded in the MPEG format according to the above-described CD-I format, for example. In some cases, when reproduction is instructed, the audio data is processed by the DSP 65 (the processing content is different from that in the MD) and output as in the case described above.

  On the other hand, the video data is supplied to the MPEG decoder 69 and decoded. The data decoded by the MPEG decoder 69 is supplied to the VRAM 70, temporarily stored, read out again, D / A converted by the D / A converter 71, output to the television receiver 49, and displayed. You. This image data can be subjected to graphic editing processing by the video processor 68 as needed.

  On the other hand, when a recording mode command is issued, one of an audio signal input from the microphone 43 or a signal input via the telephone line, the interface 61 and the filter 62 is selected by the switch 63, and A / D, D / The signal is A / D converted by the A converter 64 and supplied to the DSP 65. The DSP 65 compresses the input digital audio data in a predetermined format (MD or MPEG) according to a program stored in the memory 66 and supplies the compressed data to the MD data drive device 76. Thus, the audio data is compressed and recorded on the mini disc 3 mounted on the MD data drive device 76.

  In the present embodiment, video data cannot be recorded since no MPEG encoder is provided. However, if an MPEG encoder / decoder is provided instead of the MPEG decoder 69, video data can be recorded on the mini disc 3 as well. It becomes possible.

  The DSP 65 also executes a function as a MODEM when transmitting and receiving data via a telephone line. At this time, the DSP 65 compresses the audio signal input via the telephone line, and compresses and records the audio signal on the mini disc 3 mounted on the MD data drive device 76. Thereby, it is possible to fulfill the answering machine function. The video data or audio data reproduced from the MD data drive device 76 is transmitted via a telephone line. Further, the DSP 65 compresses the image data taken in from the printer / reader 51 by, for example, an MMR (Modified Modified READ) method and transmits the image data via a telephone line. Thereby, a kind of FAX (G3, G2) function can be achieved. Of course, it is also possible to temporarily record the image data on the mini-disc 3 and then reproduce and transmit it.

  As described above, in the present embodiment, as a program for operating the DSP 65, a compression / expansion system (ATRAC) program or an MPEG system program in a mini-disc is loaded. Circuit) need not be provided, and the cost can be reduced accordingly.

  In this embodiment, the program to be loaded into the DSP 65 is stored in the memory 75 in advance, but the program to be loaded from the mini disk 3 mounted on the MD data drive device 76 or the card mounted on the interface 77 It is also possible to load more.

  FIG. 5 shows another embodiment of the magneto-optical disk recording / reproducing apparatus of the present invention. The magneto-optical disk recording / reproducing device 81 includes a DSP 65, a memory (RAM) 66 corresponding thereto, and an MD data drive device 76 in the same manner as in the embodiment of FIG. In this embodiment, a video processor 93 and a corresponding memory (RAM) 94 are provided.

  A D / A, A / D converter / controller 91 is connected to the DSP 65, and the A / D conversion of the input analog audio signal is performed via the microphone 43 or a telephone line, and the converted analog audio signal is output to the DSP 65. The output digital audio data is D / A converted and output to the speaker 45 or a telephone line. Similarly, the D / A / A / D converter / controller 92 A / D converts the analog video signal supplied from the VTR 47 and outputs the analog video signal to the video processor 93, and also outputs the digital signal output from the video processor 93. The video data is D / A converted and output to the television receiver 49 or a telephone line.

  An interface 95 is provided to output a signal input from the remote controller 35 or the keyboard to the control port 96.

  This apparatus is provided with a ROM 99 in which a predetermined program and the like are stored in advance, a CPU 97 for executing a predetermined operation in accordance with the program, and a RAM 98 in which predetermined data and programs are stored as necessary. These are connected to the MD data drive device 76, DSP 65, video processor 93 and control port 96 via a bus.

  Next, the operation will be described. In this embodiment, when the mini disk 3 contained in the cartridge 2 is mounted on the MD data drive device 76, the CPU 97 immediately reads the user TOC of the mounted mini disk 3 and formats the format from the identification data. Identify. Then, the CPU 97 reads a program corresponding to the identified format from the ROM 99 and loads the program into the RAM 66 corresponding to the DSP 65 and the RAM 94 corresponding to the video processor 93, respectively. As a result, the DSP 65 and the video processor 93 are in a state where the compression / decompression processing corresponding to the format of the mini disk 3 mounted on the MD data drive device 76 can be executed.

  In such a state, when a recording operation command is input from the remote controller 35 or the keyboard, the command is input to the CPU 97 via the interface 95 and the control port 96. The CPU 97 starts the recording operation in response to this command.

  In the case where a mini disc of a format compatible with MD data is mounted, for example, an analog video signal supplied from a VTR 47 is A / D converted by a D / A / A / D converter / controller 92, and a video processor 93 is provided. Is input to The video processor 93 temporarily stores the input video data in the RAM 98 (or the RAM 94). Then, according to the program stored in the RAM 94, the video data stored in the RAM 98 is compressed according to, for example, the MPEG method.

  On the other hand, for example, an analog audio signal input from the microphone 43 is A / D converted by the D / A / A / D converter / controller 91 and supplied to the DSP 65. The DSP 65 temporarily stores the input digital audio data in the RAM 98 (or the RAM 66). Then, according to the program stored in the RAM 66, the digital audio data stored in the RAM 98 is compressed according to, for example, the MPEG system.

  Thus, the compressed video data and audio data are converted into an MPEG bit stream, supplied to the MD data drive 76, and recorded on the mounted mini-disc 3.

  When the mini disk 3 mounted on the MD data drive device 76 is a normal music MD format disk, a program for compressing and expanding the MD format is loaded into the RAM 66. As a result, the input analog audio signal is converted into the MD format and recorded on the mini disc 3 mounted on the MD data drive device 76.

  However, in the case of the mini-disc format, since no video data is recorded, no program is loaded in the RAM 94 in particular.

  On the other hand, when the reproduction is instructed, the data reproduced from the MD data drive device 76 is supplied to the RAM 98 and temporarily stored. The DSP 65 reads out the audio data from the data stored in the RAM 98, expands (decodes) the audio data, outputs the expanded data to the D / A / A / D converter / controller 91, and performs D / A conversion. Output to the speaker 45.

  On the other hand, the video processor 93 reads out the video data from the data stored in the RAM 98, expands (decodes) the video data, outputs the video data to the D / A / A / D converter / controller 92, and performs D / A conversion. After that, it is output and displayed on the television receiver 49.

  The video processor 93 operates only when video data is recorded on the mini disc 3 mounted on the MD data drive device 76.

  As described above, in the present embodiment, not only the DSP 65 but also the video processor 93 loads the program corresponding to the format of the mini disc 3 mounted on the MD data drive device 76, and performs the data compression / decompression processing according to this program. Therefore, it is not necessary to prepare a plurality of DSPs and video processors each having a dedicated format, and the cost can be reduced.

  In this embodiment, the programs corresponding to the respective formats are stored in the ROM 99 in advance. However, as in the case of the embodiment of FIG. It is also possible to load from the mini disk 3 or a card mounted on the interface 77.

  Also, in the embodiment of FIG. 5, the DSP 65 can execute a function as a MODEM. In this case, both the video data and the audio data input via the telephone line are converted into a signal of a predetermined frequency band (300 Hz to 4 kHz) and transmitted via the telephone line.

  In the above embodiment, the identification data for identifying the type of the format is recorded in the user TOC area of the mini disc 3. However, for example, as the data in the data area (for example, the sub data in FIG. 7). ), It is also possible to record.

  As described above, the case where the present invention is applied to a magneto-optical disk recording / reproducing apparatus has been described as an example. The present invention can be applied to a case where data is compressed and recorded, and is expanded and reproduced.

1 is a perspective view showing a configuration of an embodiment of a magneto-optical disk recording / reproducing apparatus to which the data processing device of the present invention is applied. FIG. 2 is a block diagram illustrating an internal configuration of a magneto-optical disk recording / reproducing device 31 illustrated in FIG. 1. 3 is a flowchart illustrating the operation of the embodiment in FIG. FIG. 3 is a diagram for explaining a format of a mini disc mounted on the MD data drive device 76 of FIG. 2. FIG. 11 is a block diagram showing a configuration of another embodiment of a magneto-optical disk recording / reproducing apparatus to which the data processing device of the present invention is applied. FIG. 3 is a block diagram illustrating a configuration example of a mini disk device. FIG. 7 is a diagram illustrating a format of the mini-disc of FIG. 6. FIG. 2 is a diagram illustrating the principle of image compression in the MPEG system. 5 is a timing chart illustrating an image compression order in the MPEG system. FIG. 3 is a diagram illustrating an MPEG stream in the MPEG system.

Explanation of reference numerals

2 cartridge, 3 mini disk, 4 optical pickup, 6 magnetic head, 31 magneto-optical disk recording / reproducing device, 32 insertion hole, 34 light receiving section, 35 remote controller, 43 microphone, 45 speaker, 47 video tape recorder, 49 television receiver Machine, 51 printer / reader, 65 DSP
66 memory, 68 video processor, 69 MPEG decoder, 74 microcomputer, 75 memory, 93 video processor, 94 memory, 97 CPU, 98 RAM, 99 ROM

Claims (2)

  Input means for receiving audio data and video data,
  Audio compression means for compressing audio data input by the input means;
  Video compression means for compressing video data input by the input means,
  Writing means for writing compressed audio data or compressed video data to a recording medium;
  Determining means for determining the type of the recording medium;
  Program storage means for storing a plurality of compression programs;
  When recording the data input from the input means on the recording medium, if the discriminating means determines that the recording medium is a recording medium for recording compressed audio data and compressed video data, a result of the discrimination by the discriminating means A predetermined compression program is selected from the plurality of compression programs, and the audio data is compressed by the audio compression means based on the predetermined compression program, and the video data is compressed by the video compression means. After the compression, the compressed audio data and the compressed video data are written to the recording medium,
  When the determination unit determines that the recording medium is a recording medium for compressed audio data, a predetermined compression program is selected from the plurality of compression programs based on a determination result of the determination unit, and the predetermined compression program is selected. Control means for controlling such that after the audio data is compressed by the audio compression means based on a compression program, only the compressed audio data is written to a recording medium.
  A data recording device comprising:   Input means for receiving audio data and video data,
  Audio compression means for compressing audio data input by the input means;
  Video compression means for compressing video data input by the input means,
  Writing means for writing compressed audio data or compressed video data to a recording medium;
  Determining means for determining the type of the recording medium;
  Reading means for reading a program from a wearable program storage medium in which a plurality of compressed programs are stored;
  When recording the data input from the input means on the recording medium, if the discriminating means determines that the recording medium is a recording medium for recording compressed audio data and compressed video data, a result of the discrimination by the discriminating means A predetermined compression program is selected from the plurality of compression programs stored in the wearable program storage medium, and the audio data is compressed by the audio compression means based on the predetermined compression program. After the video data is compressed by the video compression means, the compressed audio data and the compressed video data are written to a recording medium,
  When the determination unit determines that the recording medium is a recording medium for compressed audio data, a predetermined compression program is selected from the plurality of compression programs based on a determination result of the determination unit, and the predetermined compression program is selected. Control means for controlling such that only the compressed audio data is written to a recording medium after the audio data is compressed by the audio compression means based on a program.
  A data recording device comprising:

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