JP3441343B2 - Copyright information embedding device, recording medium and copyright data reproducing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to analog-digital (A /
D) A device for embedding copyright information , a recording medium, and a copyright data reproducing method for managing the copyright when the data is converted and recorded on a recording medium or transmitted via a transmission medium. .

[0002]

C as an optical disk for audio reproduction
It has been ten years since D (Compact Disc) was put on the market, and it has already been remarkably popular as a recording medium for audio information, surpassing conventional cassette tapes. The physical / logical format of a CD, which is a digital disc, is EF with a fixed data length symbol of 8 bits.
M modulation recording method, subcode, audio data, CR
It has been established as a data format system such as C,
CD players with various application functions have been developed.

A CD is also used as a CD-ROM for data by identifying it by the control bit (4 bits) of the Q channel in its subcode or by identifying it in the absence of TOC. It is expanding its applications in the field of electronic publishing by effectively utilizing the large capacity and high-speed accessibility of discs. By the way, in the above CD-ROM, the audio is ADP.
Since it is compressed by CM, the original sound quality cannot be reproduced by the compression, and recording with higher hi-fi property is desired. In other words, it is a normal CD even if compressed
It is expected that a disc capable of recording an audio signal having a frequency band twice that of the above-mentioned disc will appear.

However, if such a high-quality high-fidelity signal is copied in the state of digital information, it is convenient for the user because it is not deteriorated, but it is not desirable from the viewpoint of copyright protection. . In addition,
As a method of solving such a problem, there is a method of limiting the number of times of copying digital information or (US Patent No. 5,42).
No. 8,598), a method of not providing a digital output terminal to the device at all, a method of removing a part of the band of an analog output signal, and a method of embedding copyright data in digital data (Japanese Patent Publication No. 7-505984). Japanese Patent Laid-Open Publication No. 8-4) or a method of determining the user who has made a copy by making a small change to the original data and checking the identification signal (Japanese Patent Laid-Open No. 8-4
No. 5179) is proposed.

[0005]

By the way, in the method of embedding copyright data in digital data, when the data is D / A converted and reproduced as an analog audio signal, the sound quality is deteriorated in terms of audibility and the processed feeling. There is a problem in that the user feels something strange and feels strange. Recently, personal computers (hereinafter referred to as personal computers or PCs) are rapidly becoming multimedia, and processing of moving image and audio signals by PCs has become widespread. In recent years, it has become widespread to transmit moving image and audio signals via a communication line such as the so-called Internet.
Under such circumstances, it is conceivable that a general user desires to manage his or her own copyright when supplying a music source to another person via a medium or a communication line using a PC.

Therefore, the present invention can prevent the quality of the analog audio signal at the time of reproduction from deteriorating when the copyright data is embedded in the digital data for the convenience of the user and the protection of the copyright. Device for embedding copyright information, recording medium for code information, and reproducing copyright data
The purpose is to provide a method .

[0007]

In order to achieve the above object, the present invention comprises means described in 1) to 18) below.
It That is , 1) A / D conversion of analog audio signals into digital data
A / D conversion means and works related to the digital data
Modulation means for modulating rights data by spread spectrum
And the peak level and average level of the digital data
The peak level with respect to the average level
Depending on the fluctuation, the modulation method is applied to the digital data.
By embedding copyright data modulated by the stage
Embedding copyright data intermittently Embedding copyright data
A device for embedding copyright information having means. 2) The peak level of the copyright data embedding means is
Embed copyright data when it becomes smaller than the average level
Embed copyright information of claim 1, wherein Mukoto
Only device. 3) The copyright data embedding means has a peak level
Embed copyright data when it becomes larger than the average level
Embedding the copyright information according to claim 1 characterized in that
Only device. 4) The copyright data embedding means stores the copyright data.
5. The method according to claim 1, wherein the pattern is embedded in a burst shape.
The copyright information embedding device described in any one of 3 above. 5) The copyright data embedding means is composed of multiple channels.
Works for one or more channels in the audio signal
It is characterized in that the right data is selectively embedded temporally.
The copyright information according to any one of claims 1 to 4
Embedded device. 6) The copyright data embedding means is composed of multiple channels.
Time for two or more channels in the audio signal
Characteristically embedding different copyright data at the same time
The copyright information according to any one of claims 1 to 4.
Information embedding device. 7) The copyright data embedding means is an upsampler.
Copyright data by the sampling method and the downsampling method.
7. The method according to claim 1, wherein the information is embedded.
The device for embedding the copyright information described in 1. 8) The analog voice signal is A / D converted to digital data.
And the copyright data relating to the digital data.
The digital data is modulated by spread spectrum
The peak level and the average level of the
Depending on the variation of the bell with respect to the average level, the digital
Fill the modulated copyright data with respect to the tar data.
The copyright data is embedded intermittently by
Recorded recording medium. 9) The peak level of digital data is lower than the average level.
Make sure that the copyright data is embedded
The recording medium according to claim 8, wherein the recording medium is a recording medium. 10) The peak level of digital data is higher than the average level
Copyright data is embedded when it grows
The recording medium according to claim 8, characterized in that: 11) The copyright data is embedded in a burst form.
The method according to any one of claims 8 to 10, characterized in that
Recording medium. 12) Sub-copy without modification of the copyright data
It is recorded on the disk.
1. The recording medium according to any one of 1. 13) Copyright management without modification of the copyright data
The information is recorded in the physical information area.
The recording medium according to any one of 8 to 12. 14) One or more channels of audio signals of multiple channels
The copyright data is selectively and temporally selected for the channel.
Embedded therein.
The recording medium according to any one of 1. 15) Two or more channels among audio signals of multiple channels
Different copyright data for Yaner at the same time
Embedded therein.
The recording medium according to any one of 1. 16) Upsampling method and downsampling method
The copyright data is embedded by
The recording medium according to any one of claims 8 to 15.
body. 17) Copyright according to any one of claims 1 to 7.
An analog audio signal is A / D by the information embedding device.
Copyright data for the converted original digital data
Is embedded by being modulated by spread spectrum.
Step for extracting the copyright data from the digital data
Copyright data reproduction method having. 18) The record according to any one of claims 8 to 16.
Check that the copyright data is embedded in the medium.
The visible image shown is visible
Recording medium.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a copyright information embedding device (encoder) according to the present invention,
2 is a block diagram showing the signal processing circuit of FIG. 1 in detail, FIG. 3 is an explanatory diagram showing a sampling period and a data string of the A / D converter of FIG. 1, and FIG. 4 is user data packed by the allocation circuit of FIG. 5 is a flowchart for explaining the copyright data embedding process by the control unit in FIG. 2, FIG. 6 is an explanatory diagram showing the copyright data embedding period by the control unit in FIG. 2, and FIG. 5 is a flow chart for explaining a modification of the embedding process of FIG. 5, FIG. 8 is a block diagram showing a decoder for decoding the data processed by the encoder of FIG. 1, and FIG. 9 is a block diagram showing the signal processing circuit of FIG. 8 in detail. 10, FIG. 10 is an explanatory diagram showing a data string decoded by the decoder of FIG. 8, FIG. 11 is a block diagram showing a modified example of the signal processing circuit of FIG. 2, and FIG. It is a block diagram showing a modification of the signal processing circuit.

An analog audio signal such as a music source is input to the input terminal IN shown in FIG. 1, and the input signal is sampled by the A / D converter 31 sufficiently high enough to prohibit unconditional digital copying. Frequency (sampling period Δt shown in FIG. 3), for example, 192k
Sampled at Hz, converted into a high-resolution PCM signal of, for example, 24 bits, and as shown in FIG. 3, data strings xb1, x1, xa1, x2, xb2, x3, xa2, ... x
It is converted into bi, x2i-1, xai, x2i, ....

This data string (xbi, x2i-1, xai, x2
i) is the signal processing circuit 32 and the memory 3 shown in detail in FIG.
3 and then the DVD encoding circuit 34
Packed by. This packing data is output to the output terminal OUT1 or is modulated by the modulation circuit 35 by the modulation method according to the medium and output to the output terminal OUT2. Further, copyright data is output from the output terminal OUT3 as needed.

The configuration of the signal processing circuit 32 will be described in detail with reference to FIG. First, the output signal of the A / D converter 31 is applied to the low pass filter (LPF) 36 after the copyright data is embedded by the adder 121 as described later. The low-pass filter 36 is formed of, for example, an FIR filter that passes a 1/2 band, and has a data string (xbi, x2i-1, xai, x corresponding to the curve α shown in FIG.
From 2i), the data strings xc1, *, *, *, xc2, *, *, *, xc3, *, *, corresponding to the band-limited curve β
*, ..., xci, *, *, *, ... are obtained.

Next, among the data strings, the data "*" is thinned out by the thinning circuit 37 to generate data strings xc1, xc2, xc3, ..., Xci, ... And the data string (xbi , X2i-1, xai, x2
In i), the data xi is thinned by the thinning circuit 38 to generate data strings xb1, xa1, xb2, xa2, ..., Xbi, xai ,.

Then, these data strings xci, xbi, x
The difference calculation unit 39 including an adder based on ai
The difference xbi−xci = Δ1i xai−xci = Δ2i is calculated according to. Here, the difference data Δ1i and Δ2i are, for example, 2
It is 4 bits or less, and the number of bits may be fixed or variable.

The allocation circuit 40 packs the data string xci, the difference data Δ1i, Δ2i and the copyright data as user data as shown in FIG. 4, and outputs the user data to output it to a recording medium such as a DVD (digital video). -Recorded on a disc or transmitted to a transmission path. Note that the user data is 203
In case of 4 bytes, data xci and difference data Δ1i, Δ
2i are both 225, and the subheader is 9 bytes. Here, the data string xci is a data string in which the sampling frequency is reduced to 1/4 by limiting the band of the digital data A / D converted by the A / D converter 31.

Next, a method of embedding copyright data will be described. First, the copyright data supply unit 100 uses, as an example of copyright data relating to a signal input via the input terminal IN, a serial number (16) of a disc, which is information for managing a copy state in order to identify a copyright.・ Cutting player identifier code (4 bytes) ・ Recording date (3 bytes) ・ Number of recordings (3 bytes) ・ Number of duplicates (4 bytes) ・ Number of duplicates for managing copyright status (3 bytes) ) Is supplied to the FM modulator 114 and the allocation circuit 40.

Here, SID (source ID) information and ISRC (International Standard Rec) are used as copyright data.
(ording Code) Information is common to all countries, so it is possible to make it easier to check for pirated copies that are available worldwide. Therefore, the above "cutting player identifier code" is used as the SID information indicating this manufacturer, and the universal ISRC information is the above "information for managing the copy state in order to identify the copyright. It is adopted as a serial number.

The allocation circuit 40 distributes and packs the copyright data in the subheaders shown in FIG.
In addition to the sub-header, the DVD has a copyright management information area (CM) provided in the inner circumference of the disc so as to correspond to the TOC area defined in a CDR disc or the like.
These copyright data are recorded in more detail in the (I area). This CMI area is a partial RAM or P
Recorded in CA (Post Cutting Area).

Further, in the FM modulator 114, the copyright data is modulated by the frequency of 5 kHz from the oscillator 115, and the modulated signal is then spread by the spread modulator 116 so that it cannot be heard even if it is D / A converted. A spread spectrum (PS code: Pseudorandom Sequence Code) 117 is used to broadly spread the frequency spectrum to a low level, and the level control unit 118 controls the level according to the level of the data string (xbi, xa1). To be done. In this case, it is not possible to normally hear by setting it sufficiently lower than the CMR (Code to Music Ratio) of the psychoacoustic model such as -25 dB at 2 kHz and -19 dB at 10 kHz. Then, this modulated data is added via the switch 201 to the adder 1
21 and is embedded in the output signal of the A / D converter 31.

In this embedding process, the control unit 200 uses the control signals a, b, and c to copy the copyright data from the copyright data supply unit 1.
00, the spreading code 117, and the switch 201.
The operation of the control unit 200 will be described with reference to FIG.
A weighting inverse characteristic filter is applied to the output signal of the D converter 31 to correct the audibility (step S1). Next, the average level (correction value) and the peak level are detected (step S2), and then it is checked whether the peak level exceeds the average level (step S3).

When the peak level is greater than the average level, the copyright data supply unit 100 continues to generate and supply the copyright data by the control signal a, continues the modulation by the control signal b, and switches by the control signal c. By turning on c, the copyright data is embedded. On the other hand, when the peak level is not higher than the average level, the copyright data supply unit 100 holds the increment of the copyright data by the control signal a, stops the modulation by the control signal b, and turns off the switch c by the control signal c. Therefore, the copyright data is not embedded.

FIG. 6 (A) shows the original signal, and FIG. 6 (B) is an explanatory view showing the embedded state with respect to the original signal of FIG. 6 (A). According to the embedding processing, the copyright data is embedded during the period when the peak level of the original signal is higher than the average level, and the copyright data is not embedded during the period when the peak level is not higher than the average level, so the embedding is intermittent.

FIG. 7 shows a modification of FIG. First,
Similar to the case shown in FIG. 5, a weighting inverse characteristic filter is applied to the output signal of the A / D converter 31 to correct the auditory sense (step S11), and then the average level (correction value) and peak level are detected. Yes (step S1
2). Then, in this modification, it is checked whether the average level is sufficiently large, for example, whether the average level is larger than −19 dB with respect to the maximum level (step S1).
3) Embedding is performed when the average level> -19 dB (step S15). Further, when the average level is not −19 dB, the peak level> as in the case shown in FIG.
When the average level is reached, embedding is performed (step S14).
(15) On the other hand, when the peak level is not higher than the average level, the embedding is not performed (steps S14 → S16).

Next, the decoder will be described with reference to FIG. First, the input signal is the modulation circuit 35 on the encoder side.
The demodulation circuit 41 demodulates the data according to the modulation method of No. 1, and the DVD decoding circuit 42 decodes the decoded data (the data string xci in which the copyright data is intermittently embedded and the difference data Δ1i, Δ2i) in detail in FIG. Signal processing circuit 4 shown
3 (and the memory 44) and the copyright data rewriting unit 30, and the copyright data unpacked from the subcode or the copyright data reproduced from the CMI area is applied to the decryption unit 50. Signal processing circuit 4
In 3, the addition section 46 first calculates Δ1i + xci = xbi Δ2i + xci = xai to restore the data strings xbi and xai. Here, the data strings xbi and xai are the original 24 bits.

Next, in the interpolation processing circuit 47, the data string xa
A plurality of data of i and xbi are used to interpolate a data string xi between them as shown in FIG. In the interpolation processing circuit 47, for example, an upsampling method is used to fill 0 data in each and pass through a low-pass filter to obtain an interpolation data string xi.
The interpolated data string xi may also be obtained by curve approximation or prediction approximation. In this case, the approximation degree can be increased by adding and transmitting the approximation auxiliary data.

The data interpolated in this way are xb1, x1, xa1, x2, xb2, x3, xa2 ,.
xbi, x2i-1, xai, x2i, ... And the D / A converter 45 shown in FIG.
Is applied to the LPF (low pass filter) 56 and the digital output terminal 90.

In the D / A converter 45, a data string (xbi, x2i-1, xai) which is A / D converted on the encoder side with a quantization bit number of 24 bits and which is embedded with copyright data and recorded on a recording medium. , X2i) is converted into an analog signal at a sampling frequency of 192 kHz and is output via the analog output terminal 55. In the LPF 56, the input data is limited to, for example, a quarter band (48 kHz), is output as digital data through the output terminal 53, and is further written with a data string (xbi, x2i-1) in which copyright data is embedded. , Xai, x2i) are output as they are through the digital output terminal 90.

FIG. 11 and FIG. 12 show respective signal processing circuits of an encoder and a decoder which realize the modified example of the first embodiment. In the encoder shown in FIG. 11, the thinning circuit 38 shown in FIG.
Is not thinned out. Then, the difference calculator 39 calculates a difference xbi−xci = Δ1i xai−xci = Δ2i xi−xci = Δ3i, and the data string (xci, Δ1i, Δ2i, Δ3i) and the copyright data are packed by the allocation circuit 40. Is transmitted. Also in this case, similarly, the copyright data is intermittently embedded in the data string (xci, Δ1i, Δ2i, Δ3i).

In the decoder shown in FIG. 12, since the data string xi is not thinned out on the encoder side as described above,
The interpolation processing unit 47 is omitted. Then, the adder 46
Then, by calculating xci + Δ1i = xbi xci + Δ2i = xai xci + Δ3i = xi, the original high-quality data string (xbi,
x2i-1, xai, x2i) is restored. Since the other configurations are the same as those of the encoder and the decoder in FIGS. 2 and 9, the description thereof will be omitted.

Next, a second embodiment will be described with reference to FIGS. FIG. 13 shows the control unit 2 of the second embodiment.
FIG. 14 is a flowchart for explaining the embedding process of the copyright data by 00, FIG. 14 is an explanatory diagram showing an embedding period by the process of FIG. 13, and FIG. 15 is a flowchart for explaining a modification of the embedding process of FIG.

In FIG. 13, first, the control unit 200 sets A
From the output signal of the / D converter 31, the peak level is detected with a predetermined rising time constant (for example, 1 millisecond) and falling time constant (for example, 150 milliseconds) (step S).
21). Then, the average level is detected (step S2
2) Then, it is checked whether the peak level is less than the average level (step S23). And the peak level <
When it is the average level and it is the first time, the generation of one piece of copyright data is continued and embedded (steps S23 → S24 → S25). On the other hand,
If peak level <average level (step S2
3) or peak level <average level is not the first time (step S24), copyright data is not embedded (step S26).

Therefore, according to the embedding process,
The copyright data is embedded in the period when the peak level is less than the average level for the first time, and the copyright data is not embedded in the period when the peak level is less than the average level and the period when the peak level is less than the average level for the first time. . FIG. 14 (A) shows the original signal, and FIG. 14 (B) is an explanatory view showing the embedded state with respect to the original signal of FIG. 14 (A). Here, in a music source whose level fluctuates as shown in FIG. 14 (A), even if the source is modified by embedding it at the time when the level becomes low as shown in FIG. Since it is known that it is difficult to detect, it is possible to prevent the quality of the analog output signal from deteriorating.

The process shown in FIG. 15 corresponds to the modification of the first embodiment shown in FIG. That is, first, in FIG.
Similarly to the case shown in (1), the peak level of the output signal of the A / D converter 31 (step S31) and the average level (step S32) are detected. Then, in this modified example, in the subsequent step S33, it is checked whether or not the average level is sufficiently large, for example, whether or not the average level is larger than -19 dB with respect to the maximum level, and the average level> -19d.
In the case of B, the copyright data is embedded (step S
36).

When the average level is not −19 dB in step S33, as in the case shown in FIG. 13, the embedding is performed when the peak level is smaller than the average level and it is the first time (steps S34 → S3).
5 → S36), on the other hand, when peak level <average level (step S34) or when peak level <average level is not the first time (step S35), copyright data is not embedded (step S37).

Next, a third embodiment will be described with reference to FIGS. FIG. 16 shows the control unit 2 of the third embodiment.
FIG. 17 is a flowchart for explaining the embedding process of the copyright data by 00, FIG. 17 is an explanatory diagram showing an embedding period by the process of FIG. 16, and FIG. 18 is a flowchart for explaining a modification of the embedding process of FIG. Here, in the second embodiment, the embedding is performed when the level becomes low, but in the third embodiment, the embedding is performed when the level becomes high.

That is, in FIG. 16, first, the control unit 200 determines the peak level from the output signal of the A / D converter 31 with a predetermined rising time constant (for example, 1 millisecond) and a falling time constant (for example, 150 milliseconds). Is detected (step S41). Next, the average level is detected (step S42), and then it is checked whether the peak level exceeds the average level (step S43). If the peak level is greater than the average level and it is the first time, the generation of one piece of copyright data is continued and embedded (steps S43 → S44 → S4).
5) On the other hand, if peak level> average level (step S43) or if peak level> average level is not the first time (step S44), copyright data is not embedded (step S46).

Therefore, according to the embedding process,
The copyright data is embedded in the period when the peak level> the average level is first, and the copyright data is not embedded in the period when the peak level> is not the average level or the peak level> the average level is not the first period, so the embedding is intermittent. . FIG. 17A shows the original signal, and FIG. 17B is an explanatory diagram showing the embedded state with respect to the original signal of FIG. 17A. In a music source whose level changes as shown in FIG. 17 (A), even if the source is modified by embedding it at the time when the level becomes large as shown in FIG. Since it is known that it is difficult, it is possible to prevent the quality of the analog output signal from deteriorating.

The processing shown in FIG. 18 corresponds to the modification of the first embodiment shown in FIG. 7 and the modification of the second embodiment shown in FIG. That is, first, similarly to the case shown in FIG. 15, the peak level (step S51) and the average level (step S52) of the output signal of the A / D converter 31.
To detect. Then, in this modified example, the following step S5
3, it is checked whether the average level is sufficiently large, for example, whether the average level is larger than −19 dB with respect to the maximum level, and if the average level> −19 dB, the copyright data is embedded (step S56). .

When the average level is not −19 dB in step S53, the embedding is performed when the peak level> the average level and it is the first time as in the case shown in FIG. 15 (steps S54 → S5).
5 → S56) On the other hand, when the peak level> the average level is not satisfied (step S54) or when the peak level> the average level is not the first time (step S55), the copyright data is not embedded (step S57).

Next, a fourth embodiment will be described with reference to FIGS. In FIG. 19, steps S41 to S
Step 44 is the same as the processing shown in FIG. 16 (third embodiment). Then, if the peak level is not greater than the average level in step S43 or if it is not "first time" in step S44, the embedding flag F is set (F = 1) in step S800, and then step S4.
No embedding is performed in 6, and then the process returns to step S41. If it is "first time" in step S44, it is determined whether or not the embedding flag F is set in step S500, and if F = 1, the process proceeds to step S47. In step S47, the timer is started to determine whether or not the timer has passed, for example, 1 mm (m) seconds. If NO, the process proceeds to step S45 to embed and returns to step S41. Then, when 1 millisecond has elapsed in step S47, the process proceeds to step S49 to determine whether or not the timer has passed, for example, 1.5 seconds. If NO, the process proceeds to step S600 to reset the embedding flag F. (F = 0), then the process proceeds to step S46, the embedding is stopped, and the process returns to step S41. Then, if F = 0 in step S500, the process proceeds to step S49, and if 1.5 seconds has elapsed, the process proceeds to step S700 to set the embedding flag F (F = 1), and then through step S46. And returns to step S41.

According to such a configuration, as shown in FIG. 20, since the copyright data is embedded in bursts at intervals of 1 millisecond and 1.5 seconds or more, it is embedded continuously for a long time. Therefore, it is possible to prevent the quality of the analog output signal during reproduction from deteriorating. Further, steps S51 to S57 in the modification shown in FIG. 21 are the same as the processing shown in FIG. 18 (a modification of the third embodiment), and similarly, step S58,
By the processing of S60, S500, S600, S700, and S800, the copyright data is embedded in bursts at intervals of 1 millisecond and 1.5 seconds.

Next, a fifth embodiment will be described with reference to FIGS. Here, in the fourth embodiment, since the copyright data is embedded in a cycle of 1.5 seconds or longer, it may be embedded in a fixed cycle of 1.5 seconds depending on the music source. There is a possibility that Therefore, in the fifth embodiment, the embedding period Tx of the copyright data is randomly changed. That is, when embedding is performed in step S45, first, for example, it continues for 1 millisecond as in the fourth embodiment. Then, when 1 millisecond has elapsed in step S47, the process proceeds to step S49a, for example, 10
An arbitrary random embedding period Tx from millisecond to 1.5 seconds is set, and then, if the embedding period Tx has not elapsed in step S49b, step S6.
00 to reset the embedded flag F (F =
0), then the process proceeds to step S46 to stop the embedding, and the process returns to step S41. Then, step S500
In case of F = 0, the process proceeds to step S49b, and if the random embedding period Tx has elapsed, the process proceeds to step S49b.
Proceeding to 700, the embedding flag F is set (F =
1), then step S41 via step S46
Return to.

Further, in the modification shown in FIG. 23, the copyright data is similarly embedded in bursts at a random embedding period Tx for 1 millisecond even when the average level> -19 dB. According to this modified example, FIG.
As shown in FIG. 4, the copyright data is embedded in bursts at random periods Tx (= T1 ≠ T2 ≠ T3 ...) In a period when the average level is sufficiently large, for example, a period when the average level> -19 dB, which is annoying. Can be prevented.

In the decoders of the first to fifth embodiments (FIG. 8), the bit stream transmitted through the medium and input is as it is, the copyright data rewriting unit 30, the switch 51, and It is possible to output through the bit stream output terminal 52, and a terminal 49 for inputting a personal identification number, and a switch based on the personal identification number input through this terminal 49 and the copyright data from the DVD decoding circuit 42. A decryption unit 50 is provided which turns on 51 and controls the copyright data rewriting unit 30. The decryption unit 50 has an authentication function of determining the authenticity of the personal identification number.

When the personal identification number is input to the decryption unit 50, if the authentication is checked and it is verified that it is authentic, the copy permission condition in the copyright data from the DVD decryption circuit 42, for example, Check the "recordable number", and if it is not "0", control the copyright data rewriting unit 30 so as to decrement the recordable number in the bitstream by one, and output by turning on the switch 51. On the other hand, if it is "0", the output is prohibited without turning on the switch 51 to prohibit unlimited bitstream copying. As the copy permission condition, in addition to the “recordable number”, the “copyable period” is transmitted through the medium, and the decryption unit 5
A clock function may be provided within 0 to prohibit copying if the time when the personal identification number is input is outside the “copyable period”.

Further, the timing of embedding the copyright data is not limited to when the level of the audio signal fluctuates, but may be embedded at a constant period (or when the level fluctuates) only when the peak level exceeds -19 dB. Good (sixth embodiment). In this case, if the embedding time is about 0.49 seconds, the embedding stop time is about 0.49 seconds, and one cycle is about 0.98 seconds in FIG. 24, the average cycle of the human heartbeat is obtained. , The change of the reproduction signal due to the embedding becomes rhythmic, and it becomes hard to be perceptually detected due to the masking effect due to the period close to the human heartbeat. Further, since the interruption is performed at a constant cycle, the amount of embedded data can be increased, so that the embedding efficiency can be improved.

Next, a seventh embodiment will be described with reference to FIGS. 25 and 26. By the way, in the above-described first to sixth embodiments, the case of embedding in only one channel has been described. However, since an audio signal is actually reproduced in stereo two channels or multi-channel, it is embedded in all channels. And a method of embedding only in a specific channel (for example, the front L channel of 6 channels). However, if the embedding is continuously performed on all channels or only on a specific channel, the sound quality may be deteriorated in terms of hearing, and a feeling of processing may be felt, which may cause discomfort.

Therefore, in the seventh embodiment, one or more channels among a plurality of channels are selectively embedded in terms of time. As a result, the hearing sensation between the channels becomes unbalanced, and it is possible to make it difficult to detect the hearing.
FIG. 25 shows a process (step S-W1) of changing the channel flag for embedding, and this changing process is performed by interruption. Although various methods can be considered as the interrupt timing, for example, the interrupt timing may be set at a fixed cycle, a random cycle, each music section, or each movement section.

To simplify the explanation, FIG. 26 shows, as an example, a process in which the channels of the stereo 2ch (Lch and Rch) are alternately embedded temporally and combined with the process shown in FIG. There is. First, Lch and R
Each peak level of ch and (step S51 ′) and each average level (step S52 ′) are detected. And in FIG.
Based on the embedded channel flag set in step S-W1 shown in FIG.
Or Rch) is selected (steps S52b and S52).
c, S52d). In the following step S53, it is checked whether or not the average level of the selected channel is sufficiently large, for example, whether the average level is larger than −19 dB with respect to the maximum level, and if the average level> −19 dB, go through steps S500 and S47. And proceed to step S56 ',
The copyright data of the selected channel is embedded.

If the average level of the selected channel is not −19 dB in step S53, the peak level is greater than the average level and the selected channel is embedded when it is the first time as in the case shown in FIG. Do (steps S54 → S55 → S500 → S47 → S
56 '), on the other hand, if peak level> average level (step S54) or peak level> average level is not the first time (step S55), flag F is set to 1 (step S800), and the selected channel is selected. No copyright data is embedded (step S57 '). When embedding a selected channel, the embedding period T is 1 ms and is random, as in the case shown in FIG.
Embed in bursts with x.

Next, an eighth embodiment will be described with reference to FIG. By the way, in the first to seventh embodiments, a method of simultaneously embedding the same copyright data in a plurality of channels is conceivable. However, since the listener listens to all the channels at the same time, the reproduced sound is reproduced by this method. For some reasons, such as a sense of localization, it may be easier to detect the sound. Therefore, by embedding "temporally different copyright data" in each channel, this can be prevented. The “temporally different copyright data” may be completely different data, and may be the same data or data with a time difference.

FIG. 27 shows a configuration applied to stereo 2ch for the sake of simplicity. The copyright data supply unit 100 supplies "the copyright data L of the L channel and the copyright data R of the R channel, which are temporally different", to the FM modulators 114L and 114R, respectively. The copyright data L and R are respectively modulated by the oscillator 115 and the spread code 117 in the FM modulators 114L and 114R of two systems and the spread modulators 116L and 116R, and their levels are then controlled by the control unit 200. Level control unit 1
It is controlled by 18L and 118R and is applied to the adders 121L and 121R for embedding via the switch 201. The control unit 200, as in the first to seventh embodiments, has an L
By controlling the switch 201 based on the levels of ch and Rch, level fluctuations, and the like, "copyright data L of the L channel and copyright data R of the R channel, which are temporally different from each other," are embedded.

Next, a ninth embodiment will be described with reference to FIGS. 28 and 29. By the way, in the above-described first to eighth embodiments, since the copyright data that changes in a burst shape includes a component that exceeds the band of the original audio data, both data are embedded when the copyright data is embedded in the original audio data. If the addition is simply performed by the adder 121, it causes distortion, and this distortion is audibly detected during reproduction. In addition, if the embedded amount of the copyright data is reduced in order to make it hard to detect the sense of hearing during reproduction, the embedded amount is limited. Therefore, the ninth embodiment is configured to solve this problem.

FIG. 28 shows a copyright data embedding circuit used in place of the adder 121. This circuit is composed of a digital filter. The upsampling unit 4 performs interpolation (interpolation) and LPF processing, and the downsampling unit 5 performs thinning (decimation). FIG. 29 shows the main signals of the circuit in FIG. 28. First, as shown in FIGS. 29A and 29B, the sampling frequency fs of the original audio signal a and the copyright information b are the same, and the copyright information is The number of bits of b is the original signal a
Fewer. Then, when the original signal a and the copyright information b are added by the adder 3, a signal c including distortion is obtained as shown in FIG.

Subsequent upsampling unit (up ↑ in the figure)
2) 4 has a value of 0 between the sampling positions of the input signal c or a sampling value before the input signal c in order to up-sample the signal c input from the adder 3 at a sampling frequency fs × 2 which is twice that of the signal c. The hold value at the position is inserted as an interpolation signal, and then LPF processing is performed to create a data string d having a double sampling frequency fs × 2 as shown in FIG. 29D. This data string d
Is a signal of the same value except that it is delayed from the input signal c by a time difference τ1 due to the processing time by the upsampling unit 4.

Subsequent down-sampling section (down in the figure)
↓ 2) 5 is shown in FIG. 29 by thinning out the interpolation signal and outputting the data string e only at the sampling position of the signal c.
As shown in (E), the signal d is converted to the original sampling frequency f
Downsample to s. This data string e is a signal of the same value except that it is delayed with respect to the input signal d by a time difference τ2.
The signals have the same value except that they are delayed from 1 + τ2. According to such a process, both the phase and the amplitude are displaced when the copyright data b is embedded in the original audio data a, so that even if the embedded amount of the copyright data b is increased, it is perceptually detected during reproduction. It is possible to make it hard to be affected.

FIG. 30 shows a modification of the up / down sampling section of FIG. 28, and the embedded circuit 6 is configured to perform upsampling and downsampling simultaneously. That is, the embedded circuit 6 has a structure shown in FIG.
As shown in (E), an interpolation signal is inserted between the sampling positions of the original signal a added by the adder 3 and the added signal c of the copyright information b to double the sampling frequency fs ×
The upsampling process for converting into 2 and the downsampling process are performed only at the original sampling frequency fs. According to such a circuit, the same embedding process can be realized with a smaller amount of calculation as compared with the circuit shown in FIG.

FIG. 31 shows another modification of the up / down sampling section in FIG. The upsampling units 4-1 and 4-2 upsample the original audio signal a and the copyright information b at a sampling frequency fs × 2 which is twice that of the original audio signal a. , Or the hold value at the sampling position before the input signals a and b is inserted as an interpolation signal, and then this signal is subjected to LPF processing to create data strings a ′ and b ′ having a double sampling frequency fs × 2. . The adder 3 adds the original audio signal a ′ having the doubled sampling frequency fs × 2 and the copyright information b ′, and the subsequent down-sampling unit 5 performs the original sampling of the signal c ′ added by the adder 3. The signal e down-sampled to the frequency fs is output. According to such processing, the distortion due to the copyright information b is removed before the addition, so that
Distortion remaining in the output signal e can be reduced as compared with the circuit shown in FIG.

32 and 33 show still another up / down sampling section and its processing, respectively. In this example, the adder 3 is omitted and the upsampling unit 4
In order to upsample the original signal a and the copyright information b at twice the sampling frequency fs × 2 as shown in FIGS. 33 (A) and 33 (B), the copyright information is placed between the sampling positions of the original signal a. b is inserted as an interpolation signal, and FIG.
As shown in (C), the double sampling frequency fs × 2
The data string c is created. Next, the up-sampling unit 4 performs a low-pass filter (LPF) process on the data string c, and outputs a signal d in which low-pass components are extracted as shown in FIG. 34 (D).

The subsequent down-sampling unit 5 down-samples this data string d to the original sampling frequency fs and outputs the data string e only at the sampling position of the original signal a as shown in FIG. According to such processing, the copyright data b is added to the original audio data a.
Since both the phase and the amplitude are displaced when embedding, it is possible to make it hard to be perceptually detected during reproduction even if the amount of embedding the copyright data b is increased. FIG. 34 shows a modification of the circuit of FIG. 32, and the embedding circuit 6 is configured to perform upsampling and downsampling at the original sampling frequency fs at the same time as in the case of FIG. 30. .

FIGS. 35 and 36 show still another up / down sampling section and its processing, respectively. The copyright information b is delayed by the 1-sample delay circuit (Z-1) 7, and the copyright data string b1 as shown in FIG.
b2 ... Is generated. Then, this copyright data string b
, And the original audio data sequence a1, a2, ... Shown in FIG. 36 (A) are added by the adder 3.

The up-sampling unit 4 up-samples the data sequences a1 + b1, a2 + b2 ... And the copyright data sequences b1, b2 ... Added by the adder 3 at a sampling frequency fs × 2 which is twice that of the data sequence a.
3 are inserted as interpolation signals between the sampling positions of 1 + b1, a2 + b2 ...
As shown in FIG. 6 (C), the double sampling frequency fs ×
Two data strings b1, a1 + b1, b2, a2 + b2 ... Are created. Next, the upsampling unit 4 performs a low pass filter (LPF) process on the data string c to extract low pass components as shown in FIG. 36 (D).

The subsequent down-sampling unit 5 down-samples this data string at the original sampling frequency fs and, as shown in FIG. 36 (E), the data strings a'1, a'2 ... Only at the sampling positions of the original signal a. Is output. Even in such processing, since both the phase and the amplitude are displaced when the copyright data b is embedded in the original audio data a, even if the embedded amount of the copyright data b is increased, it is perceptible at the time of reproduction. It can be made difficult to detect. FIG. 37 shows a modified example of the circuit of FIG. 35, and the embedded circuit 6 is similar to the case shown in FIG. 30 and FIG.
By doing so, it is configured to be performed at the same time.

38 and 39 show still another up / down sampling section and its processing, respectively. In this circuit, in order to generate an interpolation signal, the original audio data strings a1, a2, ... Shown in FIG. 39 (A) and FIG. 39 (B).
Are added by the adder 3 and then the addition signals a1 + b1, a2 + b2 ...
Is delayed by the one-sample delay circuit (Z-1) 7.

The up-sampling unit 4 up-samples the original audio data sequence a1, a2 ... And the data sequence a1 + b1, a2 + b2 ... Delayed by the 1-sample delay circuit (Z-1) 7 at twice the sampling frequency fs × 2. In order to achieve this, the data strings a1 + b1, a2 + b are provided between the sampling positions of the original audio data strings a1, a2 ,.
2 ... Is inserted as an interpolation signal, and data strings a1, a1 + b1, a2, a2 + b2 ... Of double sampling frequency fs × 2 are created as shown in FIG. Next, the upsampling unit 4 performs a low-pass filter (LPF) process on this data string to output data strings d1, d2 ... From which low-pass components have been extracted, as shown in FIG. 39 (D).

The subsequent down-sampling unit 5 down-samples the data strings d1, d2 ... At the original sampling frequency fs, and as shown in FIG. 39 (E), the data strings d1, d3, d5 ... is output. FIG. 40 shows a modification of the circuit of FIG. 38, and the embedded circuit 6 simultaneously performs upsampling and downsampling at the original sampling frequency fs, as in the cases shown in FIGS. 30, 34, and 37. Is configured.

41 and 42 respectively show another up / down sampling section and its processing. In this circuit, first, the upsampling unit 4-1 upsamples the copyright data strings b1, b2 ... And the interpolation signal “0” at a sampling frequency fs × 4 which is four times that of the copyright data strings b1, b2. An interpolation signal "0" is inserted between the sampling positions of ..., and then the LPF processing is performed on the interpolation signal "0", so that the data strings c1, c2, c of the quadruple sampling frequency fs x 4 are obtained as shown in Fig. 42C.
3, c4, c5 ... Are generated. Where b1 and c1, b
2 and c5, that is, bn and c4 (n-1) +1 are the same sampling positions.

Next, the adder 3-1 outputs the original audio data sequence a1, a2-an at the sampling frequency fs and the data sequence c generated by the upsampling unit 4-1.
1, c5 to c4 (n-1) +1 are added, and the adder 3-2 uses the sampling frequency fs × 4 of 4 times and the interpolation signal “0” and the data sequence c1, c5 to c4 (n−1). Add +1.

Then, the subsequent upsampling unit 4-2.
Add up between the sampling positions of the signals added by the adder 3-1 in order to upsample each signal added by the adders 3-1 and 3-2 at a quadruple sampling frequency fs × 4. The signal added by 3-1 is inserted as an interpolation signal, and then the signal is LPF-processed, so that a data string a1 + c1, c2, c3 having a quadruple sampling frequency fs × 4 as shown in FIG. 42 (D). c4, a2 + c5, c6 ...,
Create an + c4 (n-1) +1. The upsampling unit 4-2 also outputs low-pass component data strings e1, e2 ... As shown in FIG. 42 (E) by performing a low-pass filter (LPF) process on this data string.

The subsequent down-sampling section 5 down-samples the data strings e1, 42 ... To the original sampling frequency fs and, as shown in FIG. 42 (F), the data string f1 (= e1) of only the sampling position of the original signal a. ), F2
(= E5) ... is output. FIG. 43 shows a modification of the circuit of FIG. 31, and the embedded circuit 6 is shown in FIG. 30, FIG. 34, FIG.
As in the case shown in FIG. 40, up-sampling and down-sampling are performed at the original sampling frequency fs so that they are performed simultaneously.

Next, a medium on which the data subjected to the embedding process is recorded will be described. First, FIG.
The user data string (see FIG. 4) created by the allocation circuit 40 shown in FIGS. 11 and 27 is the DV shown in FIG.
The D encoding circuit 34 encodes the DVD format as described later, and then the modulation circuit 35 performs EFM modulation.

Next, this data is supplied to a DVD cutting machine (player) (not shown) to manufacture a master disc (master) of the DVD audio disc. Then, a metal thin film is formed on this master by a sputtering method and a plating method, and further thickly plated and peeled from the master to manufacture a stamper. Next, a base material for the disc is formed by injection molding by this stamper and is bonded to each other to manufacture a DVD audio disc.

The audio (A) pack {and the video (V) pack} in the DVD audio disc are shown in FIG.
As shown in FIG. 4, 4 bytes of pack start information, 6 bytes of SCR (System Clock Reference) value, and 3 bytes of Mux for 2034 bytes of user data (A data, V data). It is configured by adding a pack header of 14 bytes in total, which is rate information and 1 byte of stuffing (1 pack = 2 in total).
048 bytes). In this case, the time stamp SC
By setting the R information as "1" in the first pack in the ACB unit and making it consecutive in the same album, it is possible to manage the time of the A pack in the same album.

Next, the tenth embodiment will be described with reference to FIGS. Recently, multimedia has been rapidly developed by PC, and processing of moving image and audio signals by PC has become widespread. In recent years, it has become widespread to transmit moving image and audio signals via a communication line such as the so-called Internet. Under such circumstances, it is conceivable that a general user desires to manage his or her own copyright when supplying a music source to another person via a medium or a communication line using a PC.

FIG. 45 is a block diagram showing a digital audio signal processing system according to the tenth embodiment of the present invention, FIG. 46 is a flow chart for explaining the digital audio signal processing program of the personal computer of FIG. 45, and FIG. FIG. 4 is a flowchart for explaining the copyright data embedding program in FIG. 46 in detail.
8 is a flow chart for explaining the copyright data reproduction program.

The personal computer 106 shown in FIG. 45 includes a disk drive device 104 or a network terminal 10.
5 to 46, a digital audio signal processing program as shown in FIG. 46 (including a copyright data embedding program shown in detail in FIG. 47 and a copyright data reproduction program shown in FIG. 48) and a music source such as surround music are supplied.

The personal computer 106 is, for example, a PP of Intel Corporation.
A CPU having an application-specific instruction set added mainly for efficiently processing digital signals such as images and sounds, like the extended instruction set (MMX) of the 55C.
106a, a RAM 106b used as a buffer at the time of data processing, a data converter 106c for converting data supplied from the disk drive device 104 or the network terminal 105, a D / A converter and an amplifier for the processed audio data. An audio interface (I / F) 106d for supplying a plurality of speakers (103L and 103R in the figure, and further speakers 103C and 103S for surround) via the display processor 106 for controlling display of a display unit (not shown).
e and an operation signal generation unit 106 that generates an operation signal based on an operation input signal from a mouse or keyboard (not shown).
have f.

In such a configuration, as shown in FIG. 46, the CPU 106a uses the disc drive device 1 for the disc on which the digital audio signal processing program is recorded.
When a program load command (command) is input via a keyboard (not shown) in the state of being set to 04 (step S61), the program data is read from the disk and loaded into the internal RAM (step S62), and when the loading is completed. The program load flag is set (step S63), and the process ends. At this time, the CPU 106a
Is compatible with MMX, it enables high-speed signal processing.

Further, the CPU 106a sets the disc in which the music source such as the surround music is recorded in the disc drive device 104,
When a play command is input via a keyboard (not shown), the first track of the disc is accessed to read the subcode indicating the disc type, and it is checked whether the subcode is "music source" (step S64). ), If YES, the copyright data embedding program detailed in FIG. 47 is executed (step S6).
5) Then, the processed audio data is converted into the audio I
/ F106d (step S66). Next, returning to step S65, the copyright data embedding program is repeated. If it is not "music source" in step S64, "unplayable" is displayed on the display unit (not shown) (step S67), and the process ends.

The CPU 106a executes a copyright data embedding program as shown in FIG. In FIG. 47, first, a process for inputting A / D converted data of a music source is executed (step S100), a process for inputting copyright data via a keyboard is executed (step S101), and then this copyright data is input. A process for spread spectrum is executed (step S102). In this spread spectrum processing, the processing is executed by software instead of hardware by the FM modulator 114 and the spread modulator 116 shown in FIGS.

In the following step S103, as shown in FIGS.
The modulated copyright data is embedded in the digital audio data by the processing shown in the flowcharts of FIGS. 11 and 13 to 31 (step S103), and then the format conversion for recording the digital audio data on the recording medium is performed. Perform (step S104).

Next, with reference to FIG. 48, a process of reproducing the copyright data thus modulated and embedded will be described. First, digital audio data in which copyright data is embedded is taken in (step S200), and then a modulation signal is extracted based on this digital audio data and original digital audio data in which copyright data is not embedded (step S201). Then, this modulated signal is spread-spectrum demodulated using the same spreading code 117 (see FIGS. 2, 11, and 27) used at the time of modulation,
Next, the original copyright data is taken out by performing FM demodulation using the same frequency as that at the time of modulation (see the oscillator 115 shown in FIGS. 2, 11, and 27) (step S202).
Next, the copyright data is collated with the database for decryption (step S203).

Next, the case where the above program and the digital audio signal processed by this program are transmitted through a communication line will be described. FIG. 49 shows FIG.
Network terminal 1 in personal computer 106 shown in FIG.
A detailed block diagram of FIG. 05 is shown in FIG. 50 and FIG.
52 is a flowchart showing the processing of the data conversion unit of FIG.
Is an explanatory diagram showing a communication network, and FIG. 53 is an explanatory diagram showing packet processing on the network of FIG. The terminal 105 is provided in both the data transmitting side personal computer 106 and the data receiving side personal computer 106, and is connected to the internal bus of the personal computer 106 by a receiving buffer T1 and a transmitting buffer T2.
A data conversion unit T4, a communication interface adapter T3, a communication terminal T6, and a controller T5.

The data conversion unit T4 on the data transmission side is shown in FIG.
, The transmission data stored in the transmission buffer T2 is divided into packets of a predetermined length (step S1).
41), and then a header including the destination address is added to the beginning of the packet (step S142), which is then sent to the network NW via the adapter T3 and the communication terminal T6.
It is output to the top (step S143). As shown in FIG. 51, the data conversion unit T4 on the data receiving side uses the network N
The header is removed from the packet received from W via the communication terminal T6 and the adapter T3 (step S151), and then the received data is restored (step S152), which is then transferred via the receive buffer T1 to the program RAM 106b shown in FIG. (Step S153).

Communication terminal T on the data transmitting side and the data receiving side
6 are connected via a network NW as shown in FIG. 52, for example. In this network NW, for example, CAT
V line, TCP / IP (Tr
Data is transmitted in packet units using the ansmission Control Protocol / Internet Protocol. In this case, as shown in FIGS. 52 and 53, the optimum route of the packet output from the data transmitting side is selected by the router R on the network NW and separated by each packet, and then separated by the router R. Each packet has a packet switch Pn (n = 1 to 1).
Packets are sequentially transmitted via k) to the personal computer 106 on the data receiving side.

Therefore, the personal computer 10 on the data receiving side
6, the copyright data can be embedded in the music source in the disc set in the disc drive device 104 based on the program on the program RAM 106b. When a copyright data embedding program or a music source in which copyright data is embedded based on this program is transferred by such a communication method, a program usage fee is charged to the sender and the receiver. To do.

The present invention is not limited to the case where the data transmitting side unilaterally transmits to the receiving side. For example, the user of the data receiving side may use the home page of the data transmitting side to
It can also be applied to a case where a program transmission request or an audio signal transmission request is transmitted and the data transmission side transmits the program or audio signal based on this request. In the case of such Internet, TCP / TCP is used as the adapter T3 that functions as an interface.
The IP protocol suite is used.

Here, a medium for storing the music source in which the copyright data is embedded, for example, a DVD-
The copy protection function can be realized by forming a visible image showing that the copyright data is embedded on the surface or inside of the base material of the audio disc by special printing or molding. As a method of forming such a visible image, for example, Japanese Patent Laid-Open No. 7-
Although detailed description will be omitted because it is described in Japanese Patent No. 988889, Japanese Patent Application Laid-Open No. 8-2158, Japanese Patent Application Laid-Open No. 9-128812, a visible image formed by such a method cannot be easily copied. Not formed as.

[0088]

As described above, according to the present invention, since the copyright data is intermittently embedded, it is possible to prevent the quality of the analog audio signal during reproduction from being deteriorated.

[Brief description of drawings]

FIG. 1 is a block diagram showing a copyright information embedding device (encoder) according to the present invention.

2 is a block diagram showing the signal processing circuit of FIG. 1 in detail.

FIG. 3 is an explanatory diagram showing a sampling cycle and a data string of the A / D converter in FIG.

FIG. 4 is an explanatory diagram showing user data packed by the allocation circuit of FIG.

5 is a flowchart for explaining a process of embedding copyright data by the control unit of FIG.

FIG. 6 is an explanatory diagram showing an embedding period of copyright data by the control unit of FIG. 2;

7 is a flowchart for explaining a modification of the embedding process of FIG.

8 is a block diagram showing a decoder that decodes data processed by the encoder of FIG. 1. FIG.

9 is a block diagram showing the signal processing circuit of FIG. 8 in detail.

10 is an explanatory diagram showing a data string decoded by the decoder of FIG.

11 is a block diagram showing a modification of the signal processing circuit of FIG.

12 is a block diagram showing a modification of the signal processing circuit of FIG.

FIG. 13 is a flowchart illustrating a process of embedding copyright data by a control unit according to the second embodiment.

FIG. 14 is an explanatory diagram showing an embedding period by the processing of FIG.

FIG. 15 is a flowchart for explaining a modification of the embedding process of FIG.

FIG. 16 is a flowchart illustrating a process of embedding copyright data by a control unit according to the third embodiment.

17 is an explanatory diagram showing an embedding period by the processing of FIG.

FIG. 18 is a flowchart for explaining a modification of the embedding process of FIG.

FIG. 19 is a flowchart illustrating a process of embedding copyright data by a control unit according to the fourth embodiment.

20 is an explanatory diagram showing an embedding period by the processing of FIG.

21 is a flowchart for explaining a modification of the embedding process of FIG.

FIG. 22 is a flowchart illustrating a process of embedding copyright data by a control unit according to the fifth embodiment.

23 is a flowchart for explaining a modification of the embedding process of FIG. 22.

FIG. 24 is an explanatory diagram showing an embedding period by the processing of FIG. 23.

FIG. 25 is a flowchart illustrating an embedding process of the seventh embodiment.

FIG. 26 is a flowchart for explaining embedding processing of the seventh embodiment.

FIG. 27 is a block diagram showing a signal processing circuit according to an eighth embodiment.

FIG. 28 is a block diagram showing a copyright data embedding circuit of a ninth embodiment.

29 is an explanatory diagram showing embedding processing of the circuit in FIG. 28. FIG.

FIG. 30 is a block diagram showing a modification of the copyright data embedding circuit in FIG. 28.

31 is a block diagram showing another modification of the copyright data embedding circuit in FIG. 28. FIG.

FIG. 32 is a block diagram showing still another copyright data embedding circuit.

FIG. 33 is an explanatory diagram showing embedding processing of the circuit of FIG. 32.

FIG. 34 is a block diagram showing a modification of the copyright data embedding circuit in FIG. 32.

FIG. 35 is a block diagram showing still another copyright data embedding circuit.

FIG. 36 is an explanatory diagram showing embedding processing of the circuit in FIG. 35.

FIG. 37 is a block diagram showing a modified example of the copyright data embedding circuit in FIG. 35.

FIG. 38 is a block diagram showing still another copyright data embedding circuit.

39 is an explanatory diagram showing embedding processing of the circuit in FIG. 38. FIG.

FIG. 40 is a block diagram showing a modification of the copyright data embedding circuit in FIG. 38.

FIG. 41 is a block diagram showing still another copyright data embedding circuit.

42 is an explanatory diagram showing embedding processing of the circuit in FIG. 41. FIG.

43 is a block diagram showing a modified example of the copyright data embedding circuit in FIG. 41. FIG.

FIG. 44 is an explanatory diagram showing an audio pack of a DVD-audio disc.

FIG. 45 is a block diagram showing a digital audio signal processing system according to a tenth embodiment of the present invention.

46 is a flow chart for explaining a digital audio signal processing program of the personal computer in FIG. 45.

47 is a flow chart for explaining the copyright data embedding program in FIG. 46 in detail.

FIG. 48 is a flow chart for explaining a copyright data reproduction program.

49 is a block diagram showing in detail a network terminal in the personal computer shown in FIG. 45.

50 is a flowchart showing the processing of the data conversion unit in FIG. 49.

51 is a flowchart showing the processing of the data conversion unit in FIG. 49.

FIG. 52 is an explanatory diagram showing a communication network.

53 is an explanatory diagram showing packet processing on the network of FIG. 52.

[Explanation of symbols]

3 adder (adding means) 3-1 adder (first adding means) 3-2 adder (second adding means) 4 upsampling unit (upsampling means) 4-1 upsampling unit (first Upsampling means) 4-2 Upsampling unit (second upsampling means) 5 Downsampling section (downsampling means) 6 Embedded circuit (upsampling means and downsampling means) 7 1 Sample delay circuit (delaying means) 30 Copyright Right data rewriting section 31 A / D converter (A / D conversion means) 32, 43 Signal processing circuit 33, 44 Memory 34 DVD encoding circuit 35 Modulation circuit 36, 56 Low-pass filter 37, 38 Decimation circuit 39, 46, 121 Addition Device 40 allocation circuit 41 demodulation circuit 42 DVD decoding circuit 4 5 D / A converter 47 Interpolation processing circuit 49 Terminal 50 Decryption section 51, 201 Switches 52, 53, 90 Digital output terminal 55 Analog signal output terminal 100 Copyright data supply section 114 FM modulator (oscillator 115, spread modulator 11)
6, the spreading code 117 and the level control unit 118 constitute a modulation means) 115 oscillator 116 spreading modulator 117 spreading code 118 level control unit 200 control unit (adder 121 and switch 201 constitute a copyright data embedding means)

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-8-31080 (JP, A) JP-A-7-78407 (JP, A) Special Tables 10-500263 (JP, A) Special Tables 10- 512110 (JP, A) International publication 95/27349 (WO, A1) International publication 96/21290 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 20/10-20/16 351 G10L 9/00 G09C 1/00-5/00 H04K 1/00-3/00 H04L 9/00-9/04 H04J 13/00

Claims (18)

(57) [Claims] 1. An analog voice signal is converted into digital data by A / A.
A / D conversion means for D conversion, modulation means for modulating copyright data relating to the digital data by spread spectrum, peak level and average level of the digital data.
Bell and detect the peak level to the average level
A copyright data embedding means for intermittently embedding the copyright data by embedding the copyright data modulated by the modulating means in the digital data in accordance with a change to the digital data; A device for embedding copyright information that it has. 2. The copyright data embedding means is a peak device.
2. The copyright information embedding device according to claim 1, wherein the copyright data is embedded when the level becomes smaller than the average level . 3. The peak of the copyright data embedding means
2. The copyright information embedding device according to claim 1, wherein the copyright data is embedded when the level becomes higher than the average level . 4. The copyright information embedding means according to any one of claims 1 to 3, wherein the copyright data embedding means embeds the copyright data in a burst form. apparatus. 5. The copyright data embedding means temporally and selectively embeds copyright data in one or more channels of audio signals of a plurality of channels. The copyright information embedding device according to any one of claims 1 to 4 . 6. The copyright data embedding means is characterized in that the temporally different copyright data is simultaneously embedded in two or more channels of audio signals of a plurality of channels. The apparatus for embedding copyright information according to any one of claims 1 to 4 . Wherein said copyright de - data embedding means, copyright de by an up-sampling method and down sampling method - copyright according to any one of claims 1, characterized in that embedding data 6 Information embedding device. 8. An analog voice signal is transferred to digital data as A / A.
While being D-converted, the copyright data relating to the digital data is modulated by spread spectrum,
The peak level and average level of the data are detected, and
Depending on the variation of the peak level with respect to the average level,
The modulated copyright data for the digital data.
A recording medium in which copyright data is intermittently embedded and recorded by embedding the data. 9. The peak level of digital data is an average level.
9. The recording medium according to claim 8 , wherein the copyright data is embedded when the recording medium becomes smaller than the file size. 10. A peak level of digital data is an average level.
9. The recording medium according to claim 8 , wherein the copyright data is embedded when it becomes larger than the bell . 11. Copyright de - Tagaba - recording medium according to any one of claims 8 to 10, characterized in that embedded in strike like. 12. The method of claim 11, wherein copyright de - data is subcommand without being modulated - claims, characterized in that it has been properly recorded on de 8
12. The recording medium according to any one of 1 to 11 . 13. The recording medium according to any one of claims 8 to 12 , wherein the copyright data is recorded in the copyright management information area without being modulated. 14. One of a plurality of channel audio signals.
The recording medium according to any one of claims 8 to 13 , wherein the copyright data is selectively embedded with respect to the above channels. 15. Two of a plurality of channel audio signals
The recording medium according to any one of claims 8 to 13 , wherein copyright data different in time is simultaneously embedded in the above channels. 16. Copyright de by an up-sampling method and down sampling method - recording medium according to any one of claims 8 to 15, characterized in that the data is embedded. 17. The method according to any one of claims 1 to 7.
An analog audio signal by the copyright information embedding device
Works on the original digital data that has been A / D converted
Right data is embedded by being modulated by spread spectrum
The copyright data from the digital data
A copyright data reproducing method having steps. 18. A recording medium according to any one of claims 8 to 16, copyright de - wherein the visible image indicating that the embedded data is provided so as to be visible recoding media.