JP2001243705A - Device and method for recording sound data and device and method for reproducing sound data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the security of recorded sound data. SOLUTION: An analog sound signal SA is converted into a digital signal to obtain sound data DA. An MP3 encoder 113 compresses the sound data DA according to the MP3 standards to convert them into a MP3 file Fmp3. An encryption circuit 114 encrypts the MP3 file Fmp3 defining the identification number of MMC 300 as a key code KYC, and obtains encrypted sound data SC-Fmp3. The sound data SC-Fmp3 are supplied as recording data to a CD-R drive 115, and are recorded on a CD-R disk. When the CD-R disk is reproduced, sound data SC-Fmp3 are obtained. Unless the sound data SC-Fmp3 are decrypted on the basis of the same key code KYC used when the sound data have been encrypted, the MP3 file Fmp3 before the encryption is not obtained, and the security of recorded sound data is thus enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio data recording apparatus and recording method, and an audio data reproducing apparatus and method. More specifically, the present invention relates to an audio data recording apparatus and the like that enhances the security of recorded audio data by encrypting the recorded audio data based on a key code and recording the encrypted audio data on a data recording medium.

[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]

For example, when data is compressed according to the MP3 standard, audio data is converted into an MP3 file and recorded on a data recording medium. The MP3 file recorded on the data recording medium in this manner can be returned to uncompressed audio data by the MP3 decoder, and anyone can obtain a reproduced sound. Therefore, when the original voice data is one that emphasizes security, some means is needed.

[0004] Therefore, an object of the present invention is to provide an audio data recording device or the like which can enhance the security of recorded audio data.

[0005]

An audio data recording apparatus according to the present invention has an input section for obtaining recorded audio data, data recording means for recording data on a data recording medium, and recorded audio data obtained by the input section. Means for obtaining encrypted audio data by encrypting the data based on a key code, and recording for controlling the operation of the data recording means so as to record the encrypted audio data obtained by the encryption means on a data recording medium. Control means.

Further, according to the audio data recording method of the present invention, a step of obtaining recorded audio data; a step of encrypting the obtained recorded audio data based on a key code to obtain encrypted audio data; Recording the encrypted audio data on a data recording medium.

In the present invention, the recorded voice data is encrypted based on the key code. The encrypted audio data obtained by encryption is, for example, a removable CD-R.
(CD-Recordable) Recorded on a data recording medium such as a disc.

For example, recorded audio data is obtained by converting an analog audio signal into a digital signal and further compressing the data. For example, recorded audio data (uncompressed audio data, compressed audio data) is input to an input terminal. The key code is, for example, an IC card mounted on an IC card interface unit, for example, an MMC.
(Multi Media Card). Further, for example, the compressed audio data is an MP3 file obtained by compressing the input audio data according to the MP3 standard.

As described above, the encrypted voice data is recorded on the data recording medium. Therefore, what is reproduced from this data recording medium is the encrypted audio data, and the original recorded audio data cannot be obtained unless the encrypted audio data is decrypted based on the key code. Therefore, if the key code is unknown, the reproduced sound cannot be obtained, and the security of the recorded audio data can be enhanced.

[0010] Also, an audio data reproducing apparatus according to the present invention comprises a data reproducing means for reproducing the audio data from a data recording medium on which the encrypted audio data is recorded, and an encrypted data reproduced by the data reproducing means. Decoding means for decoding the obtained audio data based on the key code.

Further, in the audio data reproducing method according to the present invention, the audio data is reproduced from a data recording medium on which the encrypted audio data is recorded, and the reproduced audio data is decoded based on the key code. And the step of performing.

In the present invention, the audio data is reproduced from the data recording medium on which the encrypted audio data is recorded. Then, the reproduced audio data is decrypted based on the key code to obtain audio data before encryption. The key code is, for example, an IC card mounted on an IC card interface unit, for example, an MMC (Multi
Media Card). If the audio data obtained by decoding is compressed audio data, the data is further subjected to data expansion processing to obtain the original uncompressed audio data.

As described above, when the audio data recorded on the data recording medium is encrypted, if the key code is known, the reproduced encrypted audio data is decrypted to obtain the original audio data. It becomes possible.

[0014]

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 includes a remote control signal (hereinafter, referred to as a “remote control signal”) SR from the remote control transmitter 200, for example, by infrared rays.
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. The input analog audio signal SA is converted into a digital signal and the audio data D
A / D (Analog-to-Digital) converter 11 for obtaining A
And 2.

The data recording / reproducing apparatus 100 is provided with an A /
An MP3 encoder 113 that converts the audio data DA output from the D converter 112 into an MP3 file Fmp3 as compressed audio data, and an MP3 file Fmp3
With the key code KYC to encrypt the encrypted audio data SC-
And an encryption circuit 114 for obtaining Fmp3. Here, the MP3 file Fmp3 is an audio file data-compressed according to the MP3 standard. In this embodiment, the key code KYC used in the encryption circuit 114 is the MMC 30 attached to the MMC interface unit 106.
An ID number of 0 (for example, 128 bits) is used.

The data recording / reproducing apparatus 100 has a CD-R drive 115 for recording / reproducing data on / from a CD-R disc as a recording medium. The drive 115 is connected to the bus 102 via a disk controller 116. The encrypted audio data SC-Fmp3 output from the encryption circuit 114 is input to the drive 115 as recording data.

The data recording / reproducing apparatus 100 has a digital output terminal 117 for outputting encrypted audio data SC-Fmp3 as digital data reproduced from a CD-R disc by the drive 115.

Further, the data recording / reproducing apparatus 100 has a decryption circuit 118 for decrypting the encrypted audio data SC-Fmp3 output from the drive 115 based on the key code KYC to obtain an MP3 file Fmp3. In this embodiment, the ID number of the MMC 300 attached to the MMC interface unit 106 is used as the key code KYC used in the decoding circuit 118. in this case,
If the same key code KYC as the key code KYC used when the encrypted audio data SC-Fmp3 was generated is not used, the MP3 file Fmp3 before encryption cannot be obtained by decryption.

The data recording / reproducing apparatus 100 performs a data decompression process on the MP3 file Fmp3 output from the decoding circuit 118 to obtain audio data DA.
A decoder 119, a D / A (Digital-to-Analog) converter 120 that converts the audio data DA output from the MP3 decoder 119 into an analog signal to obtain an analog audio signal SA, and outputs the analog audio signal SA And an analog output terminal 121.

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.

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
Is supplied to the encryption circuit 114.

In the encryption circuit 114, the ID number of the MMC 300 attached to the MMC interface unit 106 is used as the key code KYC, and the MP3 file Fmp
3 is encrypted, and encrypted audio data SC-Fmp3 is generated. The encrypted audio data SC-Fmp3 is
Supplied to the R drive 115 as recording data, and
Recorded on the R disk.

Next, the operation at the time of reproduction will be described. When a reproduction instruction is given by a user's operation of the remote control transmitter 200, the CD-R drive 115 reproduces and outputs the encrypted audio data SC-Fmp3 recorded on the CD-R disc. The encrypted audio data SC-Fmp3 output from the drive 115 is output to the digital output terminal 11
7 is output.

The encrypted audio data SC-Fmp3 output from the drive 115 is supplied to a decryption circuit 118. In the decryption circuit 118, the ID number of the MMC 300 attached to the MMC interface unit 106 is used as the key code KYC, and the encrypted audio data SC-Fm
p3 is decrypted. In this case, only when the ID number of the MMC 300 attached to the MMC interface unit 106 is the same as the ID number used as the key code KYC at the time of encryption, decryption of the encrypted audio data SC-Fmp3 can be normally performed. Then, the MP3 file Fmp3 before encryption can be obtained.

The MP3 file Fmp3 output from the decoding circuit 118 is supplied to the MP3 decoder 119 and returned to the audio data DA. And the MP3 decoder 11
9 is the D / A converter 1
The analog audio signal SA is converted into an analog signal at 20.
The analog audio signal SA is output to the analog output terminal 121. Therefore, by supplying the analog audio signal SA output to the analog output terminal 121 to the speaker, the user can monitor the audio related to the encrypted audio data SC-Fmp3 reproduced by the CD-R driver 115.

As described above, in the present embodiment, when recording, the CD-ROM drive 115
The encrypted audio data SC-Fmp3 obtained by encrypting the three files Fmp3 is recorded on a CD-R disc. Therefore, when this CD-R disc is reproduced, the encrypted audio data SC-Fmp3 is obtained.

If the encrypted voice 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. Therefore, in the present embodiment, the I code used as the key code KYC at the time of encryption is used.
If the MMC 300 having the same ID number as the D number is not attached to the MMC interface unit 106, the decoding circuit 117 will not decode the data properly, fail to obtain a good reproduced sound, and Security can be increased.

In the above embodiment, the MP3
Although the case where the file Fmp3 is handled has been described, the present invention can be similarly applied to a case where compressed audio data by another compression method is handled.

In the above-described embodiment, the encrypted audio data SC-Fmp3 is recorded on a CD-R disc. However, as a data recording medium, for example, a removable semiconductor memory or the like is used. Is also good.

In the above-described 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. Furthermore, the MP3 file Fmp obtained by the satellite broadcast receiver or the Internet is acquired.
An input terminal for directly inputting 3 may be provided, and the MP3 file Fmp3 may be encrypted and recorded.

In the above embodiment, the MP3
The file Fmp3 is encrypted and recorded.
A configuration is also conceivable in which audio data DA as uncompressed audio data output from the / D converter 112 or directly supplied from an input terminal (not shown) is encrypted and recorded on a CD-R disc.

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.

[0038]

According to the present invention, recorded audio data (uncompressed audio data, compressed audio data) is encrypted based on a key code and recorded on a data recording medium.
The security of the recorded audio data can be enhanced.

[Brief description of the drawings]

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

[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 encryption circuit 115 CD-R drive 117 digital output terminal 118 decryption circuit 119 MP3 decoder 120 D / A converter 121 Analog output terminal 200 Remote controller transmitter 300 Multimedia card (MMC)

Claims (16)

[Claims] An input unit for obtaining recorded voice data; a data recording unit for recording data on a data recording medium; and an encrypted voice obtained by encrypting the recorded voice data obtained by the input unit based on a key code. Encryption means for obtaining data, and recording control means for controlling the operation of the data recording means so as to record the encrypted audio data obtained by the encryption means on the data recording medium, Audio data recording device. 2. The input unit converts an analog audio signal into a digital signal to obtain uncompressed audio data, and performs a data compression process on the uncompressed audio data output from the conversion unit. 2. The audio data recording apparatus according to claim 1, further comprising: data compression means for obtaining compressed audio data as the recording audio data. 3. The audio data recording apparatus according to claim 1, wherein the input unit has a conversion unit for converting an analog audio signal into a digital signal to obtain uncompressed audio data as the recording audio data. apparatus. 4. The audio data recording apparatus according to claim 1, wherein the input section has an input terminal for inputting uncompressed audio data or compressed audio data as the recording audio data. 5. The compressed audio data is an MPEG audio lay.
5. The audio data recording apparatus according to claim 2, wherein the data is compressed according to the er-3 standard. 6. 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. 7. A step of obtaining recorded voice data, a step of encrypting the obtained recorded voice data based on a key code to obtain encrypted voice data, and a step of storing the obtained encrypted voice data in a data recording medium. Recording the audio data. 8. The audio data recording method according to claim 7, wherein the recording audio data is uncompressed audio data or compressed audio data. 9. The audio data recording method according to claim 7, wherein in the step of obtaining the encrypted audio data, the key code is obtained from an IC card. 10. A data reproducing means for reproducing said audio data from a data recording medium on which encrypted audio data is recorded, and said encrypted audio data reproduced by said data reproducing means is reproduced based on a key code. And a decoding means for decoding the audio data. 11. Audio data obtained by decoding by said decoding means is compressed audio data, and said data expansion means for performing data expansion processing on said compressed audio data obtained by said decoding means is provided. The audio data reproducing device according to claim 10, further comprising: 12. The compressed audio data is an MPEG audio file.
The audio data reproducing apparatus according to claim 11, wherein the audio data is compressed according to the ayer-3 standard. 13. The audio data reproducing apparatus according to claim 10, further comprising an IC card interface unit, wherein the key code used in the decoding unit is obtained from an IC card mounted on the IC card interface unit. apparatus. 14. A method comprising: reproducing the audio data from a data recording medium on which encrypted audio data is recorded; and decoding the reproduced audio data based on a key code. Characteristic audio data playback method. 15. The audio data reproducing method according to claim 14, further comprising a step of performing data expansion processing on the compressed audio data obtained in the decoding step. 16. The audio data reproducing method according to claim 14, wherein in said decoding step, said key code is obtained from an IC card.