JP2001110139A - Device for recording/reproducing compressedly coded audio data, reproducing device, recording/reproducing method and reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and also quickly update compressedly coded audio data in a main memory, also to suppress power consumption and to perform reproduction for a long time. SOLUTION: A disk drive part 10 records compressedly coded audio data inputted through an input-output interface 34 on a disk-shape recording medium 11, reproduces the compressedly coded audio data from the medium 11 and transfers the compressed coded audio data to the main memory 21 of a player part 20. The part 20 obtains a reproduced audio signal by reading the compressedly coded audio data from the memory 21 and decoding the compressedly coded audio data. A controlling part 30 controls to reproduce the compressed coded audio data recorded on the medium 11 by the part 10 from the medium 11 and to transfer the compressedly coded audio data to the memory 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a recording / reproducing apparatus, a reproducing apparatus, a recording / reproducing method and a reproducing method of compression-encoded audio data.

[0002]

2. Description of the Related Art In recent years, music data has been distributed over the Internet due to improvements in computer performance and processing speed, audio data compression technology, and the spread of the Internet. As the above audio data compression technology, the International Organization for Standardization (ISO)
ation for Standardization) working group (MPE
G: Moving Picture Experts Group), MP3 (MPEG-1 Audio Layer3), ATRAC3, which is an audio compression system developed by the applicant, and audio compression, developed by NTT Nippon Telegraph and Telephone Corporation. The Twin VQ method is known. In these audio compression methods, original audio data can be compressed to 1/10 or less. MP3, ATRAC3, Twin
The audio data compressed by VQ or the like is PCM data (CD-DA) used for a music CD or Windows standard WAVE data. Such music data is compression-converted by a dedicated encoder software on a computer. For example, audio data for one CD is reduced to about 6
Compressed to 4 MB.

[0003] Recently, portable MP3 players and the like, in which MP3 data stored in a flash memory is decoded by a dedicated decoder and returned to audio so that the MP3 data can be listened to by an ear receiver, are commercially available.

The MP3 player has a built-in flash memory and MP3 decoder, stores MP3 data compressed by a computer in a memory using a serial or parallel port, and reproduces the MP3 data on a circuit during reproduction. The data is D / A converted and output as audio.

The MP3 player has a storage capacity of 64M.
B flash memory is mounted, and audio data for one CD can be stored in the flash memory and reproduced.

[0006]

By the way, in the conventional MP3 player having the above-mentioned configuration, only the data stored in the flash memory can be reproduced, and the maximum capacity of the CD1 is 64 MB. There is only recording time for the number. Further, in order to change the content of the data to be reproduced, it is necessary to delete the content of the flash memory once and newly connect it directly to the computer to newly update the data, and it is not easy to update the data outdoors.
It is technically possible to make the flash memory into a card form or a stick form and make it into a removable form, but since the price of the flash memory itself is expensive,
It is not realistic to prepare many sheets.

Accordingly, an object of the present invention is to provide a flash memory capable of easily and quickly updating compressed and encoded audio data in view of the above-mentioned conventional problems, and at the same time, having a low power consumption and a long time. An object of the present invention is to realize a handy type audio player capable of time reproduction.

[0008]

According to the present invention, there is provided an apparatus for recording / reproducing compressed encoded audio data, comprising: an interface section for inputting compressed encoded audio data;
The compression-encoded audio data input via the interface unit is recorded / recorded via a disc-shaped recording medium.
A disk recording / reproducing unit for reproducing,
A solid-state memory for storing compression-encoded audio data reproduced from the disc-shaped recording medium by the reproduction unit; a reproduction processing unit for decoding the compression-encoded audio data read from the solid-state memory and outputting a reproduction audio signal; And a control unit for controlling the reproduction of the compressed and encoded audio data recorded on the disk-shaped recording medium by the disk recording / reproducing unit from the disk-shaped recording medium and transferring the data to the solid-state memory.

Further, a reproducing apparatus for compressed and encoded audio data according to the present invention comprises: a disk reproducing section for reproducing compressed and encoded audio data from a removable disk-shaped recording medium; A solid-state memory that stores the reproduced compression-coded audio data; a reproduction processing unit that decodes the compression-coded audio data read from the solid-state memory and outputs a reproduction audio signal; And a control unit for controlling data to be reproduced from the disk-shaped recording medium and transferred to the solid-state memory.

Further, according to the recording / reproducing method of the compression-encoded audio data according to the present invention, the compression-encoded audio data is recorded on a disk-shaped recording medium, and the compression-encoded audio data is reproduced from the disk-shaped recording medium. Transfer to a solid-state memory, and read and decode the compression-encoded audio data from the solid-state memory to obtain a reproduced audio signal.

Further, according to the present invention, there is provided a method for reproducing compressed encoded audio data, comprising the steps of reproducing compressed encoded audio data recorded on a removable disk-shaped recording medium and transferring the reproduced encoded encoded audio data to a solid-state memory. A reproduction audio signal is obtained by reading and decoding the compression-encoded audio data.

[0012]

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

A recording / reproducing apparatus for compressed audio data according to the present invention comprises, for example, a disk drive unit 10, a player unit 20, and a control unit 30, as shown in FIG.

The disk drive section 10 records / reproduces MP3 data as compression-encoded audio data via a disk-shaped magnetic recording medium 11, and the disk-shaped magnetic recording medium 11 is detachably mounted. A disk motor 12, a servo signal processing circuit 13 for servo-controlling the disk motor 12, a magnetic head 14 for recording / reproducing MP3 data via the disk-shaped magnetic recording medium 11, A head actuator 15 for moving the magnetic recording medium 11 in the radial direction, and recording / reproduction of MP3 data by the magnetic head 14 via the disk-shaped magnetic recording medium 11
It comprises a recording / reproducing processing unit 16 for performing reproduction. As shown in FIG. 2, the recording / reproducing processing unit 16 includes an interface unit 161 for inputting / outputting MP3 data,
The interface unit 161 has a buffer memory 162
Encoder 163 and decoder 16 connected via
4 and a recording / reproducing circuit 165 connected to the encoder 163 and the decoder 164. The magnetic head 14 is connected to the recording / reproducing circuit 165.

The recording / reproducing processing section 16 in the disk drive section 10 converts the MP3 data into 8-10 codes by the encoder 163, and further extends.
A signal modulated by ed Partial Response Class 4 is recorded on the disk-shaped magnetic recording medium 11 via the magnetic head 14. Then, at the time of reproduction, the recording / reproducing processing unit 16 demodulates the signal reproduced from the disk-shaped magnetic recording medium 11 by the magnetic head 14 in accordance with PRML, contrary to the recording, and performs 10-demodulation.
MP3 data is generated by 8-code conversion.

The disk drive unit 10 controls the MP3
As shown in FIG. 3, the disk-shaped magnetic recording medium 11 on which data is recorded / reproduced has a base thickness of 62 μm.
A non-magnetic layer 111 is applied on the base film 110 using PET or PEN to a thickness of 0.5 μm, and the coated metal magnetic powder is applied on the base film 110 as a recording layer 112 to be recorded at a thickness of 0.2 μm on both sides. As shown in FIG. 4, a stainless steel core 113 was attached to a punched 1.75 inch, and a metal shell 114 and a dustproof shutter 115 were attached to form a floppy disk of about 150 MB. Those having a capacity are used.

The disk-shaped magnetic recording medium 11
The magnetic head 14 of the disk drive unit 10 that records / reproduces MP3 data via a magnetic disk has a metal suspension 141 as shown in FIG. Can be The track width of the magnetic head 14 is 5.5 μm and the gap length is
0.23 μm. The disk-shaped magnetic recording medium 11
Is rotationally driven by the disk motor 12 at a constant rotation speed of 3600 rpm.

The player section 20 has a main memory (flash memory) 2 for storing compression-encoded audio data supplied from the disk drive section 10.
1, an audio decoder 22 for decoding MP3 data read from the main memory 21, a D / A converter 23 to which audio data decoded by the audio decoder 22 is supplied, and a reproduced audio signal obtained by the D / A converter 23 And an analog amplifier 24 for amplifying and outputting the same.

As the audio decoder 22 of the player section 20, an MPEG decoder (MP3 decoder) for converting MP3 data into PCM audio data is used.

Further, the control unit 30 includes a system control circuit 31 for controlling the disk drive unit 10 and the player unit 20, an operation unit 32, a display unit 33, and an input / output interface 34 connected to the system control circuit 31.
Etc. As shown in FIG. 6, an operation unit 32 of the control unit 30 includes a play button and a stop button 32A provided on a front surface 100A of the apparatus main body 100;
Jog shuttle ring 32B for music return, power ON /
An OFF button 32C, a disk button 32D, a SET button 32E, and the like are provided.

The front part 100 of the apparatus main body 100
A is provided with a liquid crystal panel 33A of the display unit 33.

FIG. 7 is an external perspective view of the apparatus main body 100 as viewed from the rear side, and FIG.
8, a disk-shaped magnetic recording medium 11 removably mounted on the disk motor 12 of the disk drive unit 10 is mounted on the back surface 100B of the apparatus main body 100 as shown in FIG. Bottom part 100C
A disk insertion slot 101 is provided at substantially the center for insertion from the side, and a guide groove 102 for guiding the disk-shaped magnetic recording medium 11 inserted into the disk insertion slot 101 is provided. A battery box 103 for accommodating a lithium-ion rechargeable battery for driving power is provided on the bottom surface 100C of the apparatus main body 100. The battery box 103 is closed by a lid 104 that can be opened and closed. Further, the side portion 100 of the device main body 100
D has a connection terminal 105 for an earphone and a connection terminal 106 for an AC adapter.

Further, as shown in FIG.
An optical digital output unit 107 and a line output terminal 108 for connecting to another AV device
Are provided, and an IEEE 1394 terminal 109 is provided for connection to a computer. The optical digital output unit 107 and the line output terminal 108 are connected to the audio decoder 22 of the player unit 20, and the IEEE 1394 terminal 109 is connected to the input / output interface 34 of the control unit 30.

The recording / reproducing apparatus having such a configuration is turned on by operating the power ON / OFF button 32C.
The control unit 30 controls the disk drive unit 10 and the player unit 20 as follows, and displays on the operation control of the disk drive unit 10 and the player unit 20 on the liquid crystal panel 33A of the display unit 33.

That is, the control unit 30 switches between the disc mode and the player mode by operating the disc button 32D, and when the disc button 32D is pressed and the transfer mode is set by menu selection of the disc mode, the control unit 30 sets the disc mode. The recorded contents (MP3 data file) of the disk-shaped magnetic recording medium 11 mounted on the drive unit 10 are displayed on the liquid crystal panel 33A of the display unit 33,
M by operation of a play button, a stop button 32A, a jog shuttle ring 32B for fast forward / fast rewind / song forward / song rewind, etc.
An MP3 data file to be transferred is received by receiving a P3 data file selection command, and the SET button 32 is pressed.
When a transfer command is received by the operation of E, the disk drive unit 10 controls to reproduce an MP3 data file to be transferred from the disk-shaped magnetic recording medium 11 and transfer it to the main memory 21 of the player unit 20.

Here, the transfer of the MP3 data file from the disk-shaped magnetic recording medium 11 of the disk drive unit 10 to the main memory 21 of the player unit 20 is performed at, for example, 3 MB / sec, thereby achieving a storage capacity of 64 MB. It is completed in about 22 seconds for the main memory 21. In this recording / reproducing apparatus, high-speed transfer is possible because there is no restriction on the transfer rate due to connection with a computer.

The menu selected in the disc mode includes an eject mode in addition to the transfer mode. When the eject mode is selected, the control unit 30 is mounted on the disc drive unit 10. An eject control for ejecting the disk-shaped magnetic recording medium 11 from the disk insertion opening 101 provided on the rear surface 100B of the apparatus main body 100 is performed.

Further, in the player mode, the control section 30 displays the contents (files) stored in the main memory 21 of the player section 20 on the liquid crystal panel 33A of the display section 33, and performs fast forward / fast rewind / song forwarding / In addition to receiving a file selection command by operating the jog shuttle ring 32B or the like for returning music, receiving a playback start or playback stop command by operating the play button or the stop button 32A, the file selected from the main memory 21 is read. Playback control for playing back and outputting a playback audio signal is performed.

In the recording / reproducing apparatus having this configuration, the disk drive unit 10 is provided with the IEEE 13
The operation mode can be controlled via the control unit 30 by a computer (not shown) connected to the 94 terminal 109 via an IEEE 1394 cable. When data, that is, compression-encoded audio data is supplied, MP3 data is recorded on the disk-shaped magnetic recording medium 11.

In connection with the connection with the computer, a USB connection or a parallel connection may be adopted instead of the IEEE 1394 connection. Writing data to the disk-shaped magnetic recording medium 11 by the disk drive unit 10 is about 1 MB / sec.
64 MB data can be written to the disk-shaped magnetic recording medium 11 in about 1 to 2 minutes.

In this recording / reproducing apparatus, the time required for connecting a computer and loading 64 MB of data into the main memory 21 of the player section 20 via the disk drive section 10 is at most about 2 minutes and 30 seconds. is there.

In this recording / reproducing apparatus, unlike a handy type MD player, there is no need to rotate a motor during reproduction, and the disk drive unit 10 can transfer an MP3 data file to be transferred from a disk-shaped magnetic recording medium 11 to the disk drive. Since the disk motor 12 only needs to be driven when reproducing and transferring the data to the main memory 21 of the player section 20, the power consumption can be greatly reduced. Further, in this recording / reproducing apparatus, a relatively high-capacity lithium-ion rechargeable battery is used as a driving power source, so that a handy-type audio player capable of reproducing for a long time can be realized.

Since the lithium ion rechargeable battery has no memory effect, it can be recharged, and its electromotive force is as high as 4.2 V for one. Therefore, the disk drive unit 10, the player unit 20, the control unit I that make up 30
C can be driven by one, and the capacity is large.

Here, in the above-described embodiment, an MPEG decoder (MP3 decoder) for converting MP3 data into PCM audio data is used as the audio decoder 22 of the player section 20, so that the MP3 data is compressed and encoded. Data was recorded / reproduced, but ATRAC3 decoder and TwinV
A dedicated decoder such as a Q decoder may be used as the audio decoder 22 to record / reproduce ATRAC3 data or Twin VQ data as compression-encoded audio data.

In this case, ATRAC3 data or Twin
Since VQ data is compression-encoded audio data in units of 16 bits, the disk drive unit 10
The recording / reproducing processing unit 16 in the above uses the encoder 163 to convert ATRAC3 data or Twin VQ data into 16-17 code,
As a signal multiplied by tial Response Class 4 modulation,
Recording is performed on the disk-shaped magnetic recording medium 11 via the magnetic head 14. Then, the recording / reproduction processing unit 16
During reproduction, the signal reproduced from the disk-shaped magnetic recording medium 11 by the magnetic head 14 is demodulated in accordance with PRML, and the ATRAC3 data or Twin VQ is converted by 17-16 code conversion, contrary to the recording.
Generate data.

In the above-described embodiment, the recording / reproduction of the compression-encoded audio data is performed by the disk drive unit 10 via the disk-shaped magnetic recording medium 11, but the disk drive unit 10 is compressed. By using the encoded audio data exclusively for reproduction, it is possible to further reduce the power consumption and realize a handy type audio player capable of reproducing for a long time. In this handy type audio player, a disk-shaped magnetic recording medium 11 recorded by another recording / reproducing device having a function of recording compression-encoded audio data is used. The disk-shaped magnetic recording medium 11
Since is a 1.75 inch size floppy disk, it is small, lightweight, excellent in portability, can carry many spares, and can be easily replaced outdoors.

Further, in the above-described embodiment, the integrated recording / reproducing apparatus in which the disk drive unit 10, the player unit 20, and the control unit 30 are housed in the common apparatus main body 100 is configured. 10, the player unit 20 and the control unit 30 are housed in separate housings, and as shown in FIG. 10, a disk drive device 210 including the disk drive unit 10,
For example, the configuration may be such that the memory player 230 including the control unit 30 is connected by an IEEE1394 cable 250. In this case, the disk drive 210 is, as shown in FIG.
It is connected to the computer 300 by connection, USB connection or parallel connection.

[0038]

As described above, according to the present invention, compression-encoded audio data is recorded on a disk-shaped recording medium, and the compressed-encoded audio data is reproduced from the disk-shaped recording medium and transferred to a solid-state memory. By obtaining a reproduced audio signal by reading and decoding the compression-encoded audio data from the solid-state memory, the compression-encoded audio data in the solid-state memory can be updated easily and quickly. At the time of reproducing audio data, there is no need to drive a disk recording / reproducing means for recording / reproducing the compression-encoded audio data via a disk-shaped recording medium. It is possible to realize a handy type audio player capable of performing the above.

Further, according to the present invention, the compressed and encoded audio data recorded on the removable disk-shaped recording medium is reproduced and transferred to the solid-state memory, and the compressed and encoded audio data is read from the solid-state memory and decoded. Thus, by obtaining the reproduced audio signal, the compression-encoded audio data in the solid-state memory can be updated easily and quickly, and the disk reproducing means can be driven only when the compression-encoded audio data is transferred. It suffices to realize a handy-type audio player that can reproduce for a long time with significantly reduced power consumption.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a recording / reproducing apparatus for compression-encoded audio data according to the present invention.

FIG. 2 is a block diagram showing a configuration of a recording / reproducing processing circuit provided in a recording / reproducing unit in a disk drive unit of the recording / reproducing apparatus.

FIG. 3 is a schematic cross-sectional view showing the structure of a disk-shaped magnetic recording medium in which MP3 data is recorded / reproduced by the disk drive unit.

FIG. 4 is a bottom view of a disk cartridge in which the disk-shaped magnetic recording medium is stored in a shell.

FIG. 5 is a side view schematically showing a structure of a magnetic head of the disk drive unit.

FIG. 6 is a front view of an apparatus main body of the recording / reproducing apparatus.

FIG. 7 is an external perspective view of the apparatus main body as viewed from the rear side.

FIG. 8 is a bottom view of the apparatus main body.

FIG. 9 is a plan view of the apparatus main body as viewed from above.

FIG. 10 is a diagram showing another configuration example of the recording / reproducing apparatus for compression-encoded audio data according to the present invention.

FIG. 11 is a block diagram showing a connection state of a disk drive device, a memory player, and a computer in another configuration example of the recording / reproducing device.

[Explanation of symbols]

Reference Signs List 10 disk drive unit, 11 disk-shaped magnetic recording medium, 16 recording / reproduction processing unit 20, player unit 2
0, 21 main memory, 22 audio decoder, 30 control unit, 31 system control circuit, 34 input / output interface, 100 device main body, 210 disk drive device, 230 memory player 230,
250 IEEE 1394 cable

Claims (7)

[Claims] 1. An interface unit for inputting compression-encoded audio data, and recording / encoding of compression-encoded audio data input via the interface unit via a disk-shaped recording medium.
A disk recording / reproducing unit to be reproduced; a solid-state memory for storing compression-encoded audio data reproduced from the disk-shaped recording medium by the disk recording / reproduction unit; and a decoder for decoding the compression-encoded audio data read from the solid-state memory. A playback processing section for outputting a playback audio signal through the disk; and a control for playing back the compression-encoded audio data recorded on the disc-shaped recording medium by the disc recording / playback section from the disc-shaped recording medium and transferring the data to the solid-state memory. A recording / reproducing apparatus for compression-encoded audio data, comprising: 2. The recording / reproducing apparatus for compression-encoded audio data according to claim 1, wherein said disc recording / reproducing section is configured such that said disc-shaped recording medium is detachable. 3. A disk drive device including the interface unit and the disk recording / reproducing unit; and a memory player including the solid-state memory, a reproduction processing unit, and a control unit. The disk drive device reproduces data from a disk-shaped recording medium. 2. The recording / reproducing apparatus for compressed encoded audio data according to claim 1, wherein the compressed encoded audio data is transferred via a transfer cable. 4. A disk reproducing unit for reproducing compression-encoded audio data from a removable disk-shaped recording medium, and a solid-state memory for storing compression-encoded audio data reproduced from the disk-shaped recording medium by the disk reproducing unit. A reproduction processing unit that decodes the compression-encoded audio data read from the solid-state memory and outputs a reproduction audio signal; and the solid-state memory that reproduces the compression-encoding audio data from the disk-shaped recording medium by the disk reproduction unit. And a control unit for controlling transfer of the compressed audio data to the compressed audio data. 5. A disk drive device comprising said disk reproducing unit, and a memory player comprising said solid-state memory, a reproduction processing unit and a control unit, wherein compression encoding reproduced from a disk-shaped recording medium by said disk drive device. 5. The apparatus according to claim 4, wherein the audio data is transferred via a transfer cable. 6. The compression-encoded audio data is recorded on a disk-shaped recording medium, and the compression-encoded audio data is reproduced from the disk-shaped recording medium and transferred to a solid-state memory. A method for recording / reproducing compression-encoded audio data, characterized in that a reproduced audio signal is obtained by reading and decoding a compressed audio data. 7. Reproduced audio by reproducing compressed encoded audio data recorded on a removable disk-shaped recording medium and transferring it to a solid-state memory, and reading and decoding the compressed encoded audio data from the solid-state memory. A method for reproducing compressed encoded audio data, characterized by obtaining a signal.