JP2001243704A - Device and method for recording voice data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To expand the availability of recorded voice data. SOLUTION: An analog voice signal SA is converted into a digital signal to obtain voice data DA. An MP3 encoder 113 compresses the voice data DA according to the MP3 standards and converts them into a MP3 file Fmp3. Simultaneously, a WAVE encoder 114 converts the voice data DA into a WAVE file Fwav. Furthermore, an encryption circuit 115 encrypts the MP3 file Fmp3 by using the identification number of MMC 300 as a key code KYC to obtain encrypted voice data SC-Fmp3. An HDD 115 records the MP3 file Fmp3, the WAVE file Fwav and encrypted voice data SC-Fmp3 in separate recording areas of a hard disk. Thereby, three forms of files related to the same voice data DA coexist in the hard disk. A user can reproduce and use selectively the MP3 file Fmp3, the WAVE file Fwav, or the encrypted voice data SC-Fmp3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a recording apparatus and recording method for audio data. More specifically, input audio data is recorded in a first recording area of a data recording medium, and compressed audio data obtained by compressing the input audio data is recorded in a second recording area of the data recording medium. An audio data recording device that expands the usability of the recorded audio data by recording the encrypted audio data obtained by encrypting the compressed audio data in a third recording area of the data recording medium. Etc.

[0002]

2. Description of the Related Art Conventionally, when recording audio data, MP
3 (MPEG Audio layer-3) standard, etc., allows data to be recorded for a long time.

[0003]

However, for example, MP3
The data compression method according to the standard is an irreversible compression method in which the original audio data cannot be completely reproduced from the compressed audio data. Therefore, if the compressed audio data (MP3 file) recorded is used when recompressing with another compression method, the sound quality will deteriorate. Therefore, when compressing by another compression method, it is better to use the original uncompressed audio data instead of the recorded compressed audio data. Also, for example, an MP3 file can be returned to uncompressed audio data by an MP3 decoder, and cannot be used when emphasizing the security of the original audio data.

Accordingly, an object of the present invention is to provide an audio data recording device or the like which can expand the availability of recorded audio data.

[0005]

An audio data recording apparatus according to the present invention has an input section for obtaining input audio data, data recording means for recording data on a data recording medium, and input audio data obtained by the input section. Data compression means for performing data compression processing to obtain compressed voice data, and encryption means for encrypting the compressed voice data obtained by the data compression means based on a key code to obtain encrypted voice data. Recording the input audio data obtained by the input unit in the first recording area of the data recording medium, and recording the compressed audio data obtained by the data compression means in the second recording area of the data recording medium, and encrypting the data. Recording control means for controlling the operation of the data recording means so as to record the encrypted audio data obtained by the means in the third recording area of the data recording medium.

Also, in the audio data recording method according to the present invention, a step of obtaining input audio data, a step of recording the obtained input audio data in a first recording area of a data recording medium, and a step of obtaining the obtained input audio data Obtaining compressed audio data by performing data compression processing on the data, recording the obtained compressed audio data in a second recording area of the data recording medium, and using the obtained compressed audio data as a key code. The method comprises the steps of: obtaining encrypted audio data by performing encryption based on the encrypted audio data; and recording the obtained encrypted audio data in a third recording area of a data recording medium.

In the present invention, input audio data is recorded in a first recording area of a data recording medium such as a hard disk. For example, input audio data is obtained by converting an analog audio signal into a digital signal. Further, for example, the input audio data is input to the input terminal. This input audio data is converted into, for example, a WAVE file and recorded in the first recording area of the data recording medium.

[0008] Also, data compression processing is performed on the input audio data to obtain compressed audio data. For example,
Data compression processing is performed according to the MP3 standard, and an MP3 file is generated as compressed audio data. This compressed audio data is recorded in the second recording area of the data recording medium.
For example, in the case of having a plurality of compression processing units that perform data compression using different compression methods as data compression means,
A plurality of compressed audio data obtained by the plurality of compression processing sections are respectively recorded in different portions of the second recording area.

[0009] The compressed audio data is encrypted based on the key code to obtain encrypted audio data. The key code is obtained from, for example, an IC card mounted on the IC card interface unit, for example, an MMC (Multi Media Card). This encrypted audio data is recorded in the third recording area of the data recording medium. For example, when a plurality of compressed audio data are obtained as described above, the corresponding encrypted audio data is recorded in different portions of the third recording area.

As described above, in the data recording medium, input audio data, compressed audio data obtained by performing data compression processing on the input audio data, and encrypted audio data obtained by encrypting the compressed audio data are further stored. The data is recorded, and the user can selectively reproduce and use the input audio data, the compressed audio data, or the encrypted audio data from the data recording medium. For example, when compression is performed by another compression method, input audio data can be reproduced from a data recording medium and used. When importance is placed on the security of the recorded audio data, the encrypted audio data can be reproduced and used. As a result, the availability of the recorded audio data is increased.

[0011]

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

FIG. 1 shows a configuration of a data recording / reproducing apparatus 100 as an embodiment.

The data recording / reproducing apparatus 100 has a CP which constitutes a controller for controlling the operation of the entire apparatus.
A U (Central Processing Unit) 101 is provided.
The CPU 101 is a control system and information system bus 1.
02. The bus 102 further includes a CPU
A ROM (Read Only Memory) 103 storing data, programs, and the like necessary for the operation of the CPU 101;
RAM (Random Access Memory) used to store data generated with the operation of
mory) 104 is connected.

The data recording / reproducing apparatus 100 also receives a remote control signal (hereinafter referred to as “remote control signal”) SR from the remote control
It has a remote control signal receiving unit 105 for receiving M and supplying it to the CPU 101, and an MMC interface unit 106 for mounting the MMC 300 as an IC card. These remote control signal receiving unit 105 and MMC
The interface units 106 are connected to the bus 102, respectively.

The data recording / reproducing apparatus 100 has an input terminal 111 to which an analog audio signal SA obtained by reproducing, for example, a CD (Compact Disc) or an MD (Mini Disc) is input. A / D (Analog-to-Di) which converts the input analog audio signal SA into a digital signal to obtain audio data DA as input audio data
gital) converter 112.

Further, the data recording / reproducing apparatus 100 has an A /
An MP3 encoder 113 for converting the audio data DA output from the D converter 112 into an MP3 file Fmp3 as compressed audio data;
WAVE encoder 114 for converting to file Fwav
And an encryption circuit 115 for encrypting the MP3 file Fmp3 with the key code KYC to obtain encrypted audio data SC-Fmp3.
And

Here, the MP3 file Fmp3 is an MP3 file.
This is an audio file that is data compressed according to the standard. Also, W
The AVE file Fwav is the most basic audio file handled by Windows (trademark of Microsoft Corporation, USA). In the present embodiment, the key code KYC used in the encryption circuit 115 is the MMC interface unit 106
The ID number (for example, 128 bits) of the MMC 300 attached to the MMC 300 is used.

The data recording / reproducing apparatus 100 includes a hard disk drive (HDD) 11 for recording and reproducing data on a hard disk (HD) as a recording medium.
6. The drive 116 is connected to the bus 102 via a hard disk controller (HD controller) 117. This drive 116 has
MP3 output from the above-described MP3 encoder 113
File Fmp3 and WAVE encoder 114 described above
The output WAVE file Fwav and the encrypted audio data SC-Fmp3 output from the encryption circuit 115 are input as recording data.

The data recording / reproducing apparatus 100 has a digital output terminal 118 for outputting an MP3 file Fmp3, a WAVE file Fwav or encrypted audio data SC-Fmp3 as digital data reproduced from the hard disk by the drive 116. I have.

Further, the data recording / reproducing apparatus 100 is a CD-R (CD-Recordable) drive 1 for recording audio data output from the drive 116 on a CD-R disc.
19. The drive 119 is connected to the bus 102 via the disk controller 120. The drive 119 outputs a CD only when encrypted audio data SC-Fmp3 is output from the drive 116, for example.
-Control is performed to enable data recording on the R disk.

Next, the data recording / reproducing apparatus 10 shown in FIG.
The operation of 0 will be described.

First, the operation at the time of recording will be described.
The analog audio signal SA input to the input terminal 111 is A
The data is converted into a digital signal by the / D converter 112 and becomes audio data DA. This audio data DA is supplied to the MP3 encoder 113 and the WAVE encoder 114.

When a recording instruction is given by a user's operation of the remote control transmitter 200, the MP3 encoder 113 compresses the audio data DA in accordance with the MP3 standard, and
Converted to 3 file Fmp3, this MP3 file Fmp3
Are supplied to the hard disk drive 116 as recording data. At the same time, the WAVE encoder 114 converts the audio data DA into a WAVE file Fwav, and the WAVE file Fwav is supplied to the drive 116 as recording data.

Further, in the encryption circuit 115, the ID of the MMC 300 attached to the MMC
The number is used as the key code KYC, the MP3 file Fmp3 is encrypted, and encrypted audio data SC-Fmp3 is generated. And this encrypted voice data SC-Fmp3
Are supplied to the CD-R drive 116 as recording data.

In the drive 116, the MP3 file Fmp3 supplied from the MP3 decoder 113, WA
Each of the WAVE file Fwav supplied from the VE encoder 114 and the encrypted audio data SC-Fmp3 supplied from the encryption circuit 115 are recorded in separate recording areas of the hard disk. That is, as shown in FIG. 2, the MP3 file F is stored in the recording area A on the hard disk.
mp3 is recorded, and the encrypted audio data SC-Fmp is recorded in the recording area B.
3 is recorded, and the WAVE file Fwav is recorded in the recording area C. That is, three types of files related to the same audio data DA coexist on the hard disk.

Next, the operation at the time of reproduction will be described. When the user instructs the reproduction of the MP3 file Fmp3 recorded on the hard disk by the operation of the remote controller transmitter 200, the drive 116 reproduces the MP3 file Fmp3 from the recording area A of the hard disk and outputs the reproduced file to the digital output terminal 118. . Similarly, when an instruction to reproduce the WAVE file Fwav recorded on the hard disk is given by the user's operation of the remote control transmitter 200, the drive 116 reproduces the WAVE file Fwav from the recording area C of the hard disk and outputs it to the digital output terminal 118. Is output.

When a user gives an instruction to reproduce the encrypted audio data SC-Fmp3 recorded on the hard disk by an operation of the remote control transmitter 200, the drive 11
At 6, the encrypted audio data SC-Fmp3 is reproduced from the recording area B of the hard disk and output to the digital output terminal 118. Further, in the state where the encrypted audio data SC-Fmp3 is reproduced by the drive 116, the CD-R
When a recording operation is performed in the drive 119,
SC-Fmp3 encrypted audio data reproduced by drive 116
Is recorded on a CD-R disc by the CD-R drive 119.

As described above, in the present embodiment, during recording, the MP3 file Fmp3 (compressed audio data), the WAVE file Fwav (uncompressed audio data), The encrypted audio data SC-Fmp3 is recorded in separate recording areas of the hard disk.

For this reason, the user is required to input the MP3 file Fmp
3, WAVE file Fwav or encrypted audio data SC-
Fmp3 can be selectively reproduced and used. Therefore, the usability of the recorded audio data is expanded.

For example, if the MP3 file Fmp3 is required, the remote control transmitter 200 instructs the reproduction of the MP3 file Fmp3, and the digital output terminal 118
A P3 file Fmp3 can be obtained. MP3
If compression is performed using another non-standard compression format and uncompressed audio data is required, the remote control transmitter 200
By instructing to reproduce the WAVE file Fwav, the WAVE file Fwav can be obtained at the digital output terminal 118.

For example, when importance is placed on the security of the original audio data, the reproduction of the encrypted audio data SC-Fmp3 is instructed by the remote control transmitter 200, so that the encrypted audio data SC-Fmp3 is output to the digital output terminal 118. Fmp3 can be obtained. If the encrypted audio data SC-Fmp3 is not decrypted based on the same key code KYC used at the time of encryption, the MP3 file Fmp3 before encryption cannot be obtained.

In the above embodiment, the MP3
Although the file Fmp3, the WAVE file Fwav, and the encrypted audio data SC-Fmp3 are recorded on the hard disk, a semiconductor memory or the like may be used as a data recording medium.

In the above embodiment, the analog audio signal SA input to the input terminal 111 is converted into a digital signal by the A / D converter 112 to obtain audio data DA as input audio data. However, a configuration may be employed in which an input terminal for directly inputting the audio data DA is provided.

In the above embodiment, the audio data DA is obtained by compressing the audio data DA according to the MP3 standard.
Although the file is handled as compressed audio data, compressed audio data obtained by compressing the audio data DA by another compression method may be handled.

Further, in the above-described embodiment, the case where the encrypted audio data SC-Fmp3 reproduced from the hard disk drive 116 can be recorded on the CD-R disk by the CD-R drive 119 has been described. It is good also as a structure which can record on a semiconductor memory etc.

In the above embodiment, the MMC
I of the MMC 300 attached to the interface unit 106
Although the D code is used as the key code KYC, the key code may be supplied by other means. For example, the user may input from the remote control transmitter 200.

In the above embodiment, MP3
The decoder 113 generates an MP3 file Fmp3 and records it in the recording area A of the hard disk.
Encrypted audio data S obtained by encrypting file Fmp3
Although the C-Fmp3 is recorded in the recording area B of the hard disk, it has a plurality of compression processing units for performing data compression using different compression methods, and obtains a plurality of obtained compressed audio data separately in the recording area A. A configuration may be adopted in which a plurality of pieces of encrypted audio data are obtained by encrypting a plurality of pieces of compressed audio data, and a plurality of pieces of encrypted audio data obtained by encrypting the plurality of pieces of compressed audio data are separately recorded in the recording area B. As a result, the range of selection by the user is further expanded, and the availability of the recorded audio data is expanded.

[0038]

According to the present invention, input audio data is recorded in the first recording area of the data recording medium, and compressed audio data obtained by compressing the input audio data is stored in the second recording area of the data recording medium. And recording the encrypted audio data obtained by encrypting the compressed audio data in a third recording area of the data recording medium.
The recorded input audio data, compressed audio data, or encrypted audio data can be selectively used, and the availability of the recorded audio data is expanded.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a data recording / reproducing apparatus as an embodiment.

FIG. 2 is a diagram for explaining recorded contents of a hard disk.

[Explanation of symbols]

 Reference Signs List 100 data recording / reproducing device 101 CPU 105 remote control signal receiving unit 106 MMC interface unit 111 input terminal 112 A / D converter 113 MP3 encoder 114 WAVE encoder 115 encryption circuit 116 hard disk drive 118 digital output terminal 119 CD-R drive 200 remote control transmitter 300 Multimedia Card (MMC)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) G11B 20/12 G10L 9/18 M

Claims (16)

[Claims] An input unit for obtaining input audio data; a data recording means for recording data on a data recording medium; and a data compression process for performing data compression processing on the input audio data obtained by the input unit. Data compression means for obtaining data; encryption means for encrypting the compressed voice data obtained by the data compression means based on a key code to obtain encrypted voice data; and the input voice obtained by the input unit Data is recorded in a first recording area of the data recording medium, the compressed audio data obtained by the data compression means is recorded in a second recording area of the data recording medium, and obtained by the encryption means. Recording control means for controlling the operation of the data recording means so as to record the encrypted audio data in the third recording area of the data recording medium. Voice data recording device. 2. The data compression means has a plurality of compression processing units for performing data compression by different compression methods, and the data recording means stores a plurality of compressed audio data obtained from the plurality of compression processing units. Each of the data is recorded in a separate portion of the second recording area of the data recording medium, and a plurality of encrypted audio data obtained by the encrypting means corresponding to the plurality of compressed audio data are recorded on the data recording medium. The audio data recording apparatus according to claim 1, wherein recording is performed in separate portions of the third recording area. 3. The audio data recording apparatus according to claim 1, wherein said input section converts said analog audio signal into a digital signal to obtain said input audio data. 4. The audio data recording device according to claim 1, wherein the input unit has an input terminal to which the input audio data is input. 5. The audio data recording device according to claim 1, wherein the data recording medium is a hard disk. 6. The data recording means according to claim 1, wherein said input audio data obtained by said input section is converted into a WAVE file and recorded in said first recording area of said data recording medium. 2. The audio data recording device according to 1. 7. The data compression means according to claim 1, wherein said input audio data obtained by said input section is MPEG Audio layer-3.
2. The audio data recording apparatus according to claim 1, wherein the compressed audio data is obtained by performing data compression according to a standard. 8. The audio data according to claim 1, further comprising an IC card interface unit, wherein the key code used in the encryption unit is obtained from an IC card mounted on the IC card interface unit. Recording device. 9. A data reproducing means for reproducing data from the data recording medium, and a drive for recording audio data reproduced by the data reproducing means on a removable data recording medium. 2. The audio data recording device according to 1. 10. The audio data recording device according to claim 9, wherein said removable data recording medium is a disk-shaped recording medium. 11. The drive becomes recordable when the encrypted audio data recorded in the third recording area of the data recording medium is reproduced by the data reproducing means. The audio data recording device according to claim 9. 12. A step of obtaining input audio data, a step of recording the obtained input audio data in a first recording area of a data recording medium, and performing a data compression process on the obtained input audio data. Obtaining compressed audio data by recording the compressed audio data in a second recording area of the data recording medium; and encrypting the obtained compressed audio data based on a key code. An audio data recording method, comprising: obtaining encrypted audio data; and recording the obtained encrypted audio data in a third recording area of the data recording medium. 13. In the step of obtaining the compressed audio data, the input audio data is subjected to data compression by different compression methods to obtain a plurality of compressed audio data, and the step of recording in the second recording area includes: In the step of recording each of the plurality of obtained compressed audio data in a separate part of the second recording area of the data recording medium, and obtaining the encrypted audio data, each of the plurality of obtained compressed audio data is Encrypting the plurality of encrypted audio data based on the key code to obtain a plurality of encrypted audio data, and recording the plurality of encrypted audio data in the third recording area. 13. The audio data recording method according to claim 12, wherein recording is performed in different portions of the recording area of No. 3. 14. The apparatus according to claim 12, wherein in the step of recording the input audio data in a first recording area of the data recording medium, the input audio data is converted into a WAVE file and recorded. Audio data recording method. 15. The method according to claim 12, wherein in the step of obtaining the compressed audio data, the input audio data is subjected to data compression according to the MPEG Audio layer-3 standard to obtain the compressed audio data. Audio data recording method. 16. The audio according to claim 12, further comprising a step of reproducing the encrypted audio data from the third storage area of the data recording medium and recording the encrypted audio data on a removable data recording medium. Data recording method.