WO1999036910A1

WO1999036910A1 - Recording method for specifying master recording medium and method for specifying master recording medium

Info

Publication number: WO1999036910A1
Application number: PCT/JP1998/000146
Authority: WO
Inventors: Yasutaka Sato
Original assignee: Kabusiki Kaisha Intellectual Cyber; Yuugen Kaisha Emudasu Systems
Priority date: 1998-01-16
Filing date: 1998-01-16
Publication date: 1999-07-22
Also published as: TW374157B; AU5496498A

Abstract

A method for recording digital sound signals on a master recording medium (2) from a source recording medium (1). The digital sound signals recorded on the master recording medium (2) are generated by adding and subtracting digital signals specific to recording mediums inputted from an input device (5) to or from the sound section of the source digital signals of the source recording medium (1).

Description

Specification

Recording method for specifying mass storage medium and method for specifying the same

Technical field

The present invention relates to a method for specifying a recording medium when a medium for recording a digital audio signal, such as a CD software for music, a DVD software, or a laser disk, is illegally copied. Background art

Unauthorized copies, such as music CDs, are called "pirated", and a considerable number are said to be on the market. Various measures have been taken to prevent such illegal copying. For example, a method such as putting an ID or a password in a non-copyable area of a medium to make a copy product unusable or making the copy itself impossible is possible. However, at present, illegal copying is performed even using such various means. At present, it is not possible to specify the mass storage media for illegally copied items. This is because the signal for specifying the recording medium recorded on the mass storage medium is not recorded on the illegally copied product because it is in an uncopyable area.

For these reasons, there has been an increasing demand for a method of specifying a recording medium. The present invention provides a method for identifying such a mass storage medium. Disclosure of the invention

A method of recording on a mass storage medium according to the present invention which solves the above problems is a method of recording an audio digital signal from a source recording medium to a master recording medium. An audio digital signal is created by adding and subtracting a recording medium specific digital signal to and from the audio portion of the source digital signal. The recording medium specific digital signal has a volume of the source digital signal which is higher than the average value and the rate of change of the volume of the source digital signal when the average value and the rate of change of the source digital signal are higher than a predetermined value. It is added or subtracted at the 2nd to 5th sampling clocks after the clock cycle. At this time, in the recording medium specifying digital signal, one digit of the signal is repeatedly added and subtracted by the set number of times. The source digital signal to which the recording medium specific digital signal has been added / subtracted in this manner is recorded on the mass storage recording medium and the recording storage medium as a mass digital signal. The source digital signal and the master digital signal are separated into three types of signals during playback: a clock signal, an L / R image signal, and a source data signal. The source data signal is added to or subtracted from the recording medium specific digital signal.

The method of specifying the mass storage medium recorded in this way is performed by performing a logical operation on the digital signal read from the copy storage medium on which the mass storage medium is duplicated, and comparing the recorded source signal with a logical operation. And a second step of comparing the result of the logical operation with the recording medium specifying signal recorded and stored. Or Kovi—the first process of A / D converting an analog signal read from a storage medium and comparing the recorded digital signal with the recorded digital signal, and the copy recording medium signal and the recorded digital signal. If the values match, then a second step of comparing with the source signal, a third step of adding the difference between the signal of the copy recording medium and the source signal to the source signal, And a fourth step of comparing with the evening digital signal.

Such mass storage media is used for CD software for music. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram of an apparatus used for recording on a mass storage medium according to the present invention. In Figure 2, A is the analog waveform of the readout signal, and B is the quantized waveform. Fig. 3 shows an example of a recording medium identification signal. Fig. 4 is a detailed circuit diagram of the mixer circuit. Fig. 5 is a block diagram of the comparison device between the source recording medium and the recording medium. FIG. 6 is a detailed circuit diagram of the comparison device. BEST MODE FOR CARRYING OUT THE INVENTION

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

The recording method of the master recording medium in which the master recording medium can be specified is performed using an apparatus as shown in FIG. Here, the digital recording medium identification signal is added by the mixer unit 4 to the digital audio signal read from the source recording medium 1, and the mass recording is performed. Record on medium 2.

This will be described in more detail below.

First, a digital audio signal read from the source recording medium 1 by the reproducing device 3 is sent to the mixer unit 4.

The digital audio signal transmitted to the mixer unit 4 is input to the arithmetic circuit 8 and the adding circuit 9. In the arithmetic circuit 8, the input digital audio signal is first D / A converted to an analog audio signal. The D / A converted waveform becomes a waveform as shown in Figure A in Figure 2. When this is quantized and expressed, the waveform becomes as shown in Figure B. Here, the average value of the quantized signal within an arbitrary time and the rate of change per clock are calculated. If the average value and the change rate are larger than the preset values and the signal is larger than the average value, a command to add or subtract the signal is sent to the adder circuit 9; Does not send instructions to add or subtract. The add / subtract instruction is transmitted 2 to 5 clocks after the first peak value of the audio signal after satisfying the above conditions. The addition circuit 9 which has received the addition / subtraction instruction adds and subtracts the digital audio signal input from the playback device 3 and the digital recording medium specifying signal input from the memory 7, and outputs the result. The memory 7 temporarily stores numbers and symbols input from the input device 5 such as a keyboard. Then, when there is an addition / subtraction instruction, a number or a symbol is transmitted to the addition circuit 9 as a digital recording medium specifying signal.

The digital audio signal output from the mixer 4 is input to the recording device 6, and is recorded on the recording medium 2 through the recording device 6.

When the master recording medium 2 recorded in this manner is reproduced, the reproduced sound is changed by the amount of addition and subtraction of the recording medium specifying signal compared to the source sound. However, the changing evening is two to five sampling clocks after the point where the playback volume has increased, that is, the 44.1 MHz clock for music CDs is the second to fifth clock, so the human ear It is impossible to distinguish this. In addition, the faster the sampling clock, the harder it is to hear changes from the source sound. The arithmetic circuit 8 that outputs the addition / subtraction instruction to the addition circuit 9 can also randomly output the addition / subtraction instruction irrespective of the average value and the rate of change of the quantized signal of the source recording medium 1. In this case, for example, a random number generation circuit Outputs an addition / subtraction command when a certain random number is sensed.

When a number consisting of 43290 as shown in Fig. 3 is input, the recording medium identification signal outputs each number a certain number of times. In other words, the recording medium identification signals are 444, 333, 222, 999, 000, etc. Each digit can be entered in hexadecimal from 0 to F to represent it with 4 bits.

Next, the operation of the mixer 4 will be described more specifically.

Mixer 4 shown in Fig. 4 has an input buffer 10 that separates the audio digital signal input from playback device 3 into three types of signals: a clock signal, an L / R image signal, and a source signal. A beak / average value detection circuit 12 for obtaining the peak value and average value of the signal volume and inputting it to the CPU 15; a change rate detection circuit 13 for obtaining the change rate of the source data signal volume and inputting it to the CPU 15; A clock input circuit 14 for inputting a clock signal to the CPU 15; a delay circuit 11 for inputting a delayed source data signal to the mixer circuit 16; a CPU 15 for outputting an add / subtract instruction to the mixer circuit 16; A mixer circuit 16 for adding / subtracting the recording medium specifying signal to / from the evening signal, an output buffer 18 for outputting a source data overnight signal obtained by adding / subtracting the recording medium specifying signal, and a temporary storage medium for the recording medium specifying signal input from the input device 5. RAMI 7 and M.C 19 for storing the recording medium specifying signal.

The peak / average value detection circuit 12 first performs D / A conversion of the input source data signal, obtains a beak value of the volume of the source data signal obtained by analog conversion and an average value within an arbitrary time, and obtains the value. To CPU 15. The change rate detection circuit 13 also performs D / A conversion on the input source data overnight, obtains a change rate of the analog-converted source data signal, and sends the value to the CPU 15. The CPU 15 determines whether the average value and the change rate of the input source / output signal are larger than the set values, and determines whether the volume of the source / output signal at that time is higher than the average value. Only when it is larger, the add / subtract instruction is transmitted to the mixer circuit 16, and at the same time, the digital recording medium specific signal input from the RAMI 7 is input to the mixer circuit 16. At this time, the digital recording medium specifying signal is input to the mixer circuit 16 after 2 to 5 clocks after detecting the first beak value after satisfying the conditions of the average value, the rate of change, and the volume of the source data signal.

The mixer circuit 16 has a peak / average value detection circuit 12 (or Ratio detection circuit 13) + Adds or subtracts the source data signal delayed by the same time as the delay of the CPU 15 and the digital recording medium specifying signal sent from the CPU 15 to process the digital recording medium specifying signal. Output the output data signal. The data signal processed by the digital recording medium specifying signal is input to the recording device 6 via the output buffer 18, and is recorded on the mass storage medium 2 by the recording device 6. The data signal processed by the digital recording medium specifying signal is also input to the MC 19 and is recorded and stored on a CD-R or the like as recording data for specifying the mass storage medium 2. . The RAM I 7 temporarily stores the digital recording medium specifying signal input from the external input device 5, and transmits the digital recording medium specifying signal to the CPU 15 when called from the CPU 15.

When copying the mass storage medium 2 created in this way, the ID and serial number corresponding to the recording medium identification signal, which was conventionally in the non-corrugated area, are imprinted in the data area. The specific signal is also recorded on the copy. As a result, if an illegally copied product becomes available, the device shown in FIG. 5 can be used to specify the mass storage medium.

Here, a comparison method when the signal read from the copy recording medium 21 is digital will be described. The digital audio signal read from the source recording medium 1 and the digital audio signal read from the Coby recording medium 21 are input to the comparison device 20. The signal compared here outputs the result of the comparison as a specific digital signal. This specific digital signal is the same signal as the digital recording medium specifying signal input at the time of manufacturing the mass recording medium. As a result, the mass-recorded recording medium that has been illegally copied can be specified. Next, a comparison method when the signal read from the copy storage medium 21 is analog will be described with reference to FIG. 6 as follows.

The comparison device shown in FIG. 6 includes an input buffer 23 that separates the reproduction data of the recording medium into three types of signals, namely, a clock signal, an L / R image signal, and a source data signal. A SW operation circuit 24 for extracting the volume, an L / R counter circuit 25 for measuring the zero reset timing from the L / R timer signal, and a clock timer circuit 26 for measuring the sampling frequency of the clock signal. A TS comparison circuit 27 for comparing the reproduced data of the copy recording medium with the reproduced signal of the source recording medium; MSW arithmetic circuit 28 for reproducing the recording medium to analog data, clock timer circuit 30 on the M.C 19 side to synchronize the clock with the comparison result, and L on the M.C 19 side to synchronize the zero reset timing A / R counter circuit 29 is connected to an M.C 19 that records a digital signal obtained by adding and subtracting a digital source data signal and a digital recording medium specific signal.

The clock timer circuit 26 receives the clock signal from the input buffer 23, measures the frequency of the clock signal, and inputs the clock signal to the TS comparison circuit 27. The L / R counter circuit 25 measures the zero reset timing from the L / R timer signal received from the input buffer 23, and the SW operation circuit 24 calculates the zero reset timing from the source data signal received from the input buffer 23. Measure the volume, each! ^1. Input the measurement result to the S comparison circuit 27. The T.S comparison circuit 27 synthesizes the digital reproduction signal of the copy recording medium from the clock signal, the zero reset timing, and the volume data input from the clock timer circuit 26, the L / R counter circuit 25, and the SW operation circuit 24. .

Here, when the MSW arithmetic circuit 28 inputs the stored mass read / read signal read from the M.C 19 to the T.S comparison circuit 27, the T.S comparison circuit 27 And the reproduced signal of the M.C. If the comparison results match, then the source signals are read from M.C. 19 and compared to generate the difference between the two signals. This difference is input to the clock timer circuit 30 and the L / R counter circuit 29 on the MC 19 side, where the clock component and the zero reset timing component are combined and input to the MC 19. The combined difference data input to M.C is further combined with the source data signal. When this data coincides with the master data signal recorded and stored, it can be understood that the reproduced data of the recording medium is a data signal obtained by adding or subtracting the recording medium specifying signal. When the waveform is output to a CRT or the like during the comparison, it is possible to visually check the data comparison result between the copy recording medium and the source medium.

Industrial applicability

By using the recording medium recording method of the present invention, it is possible to specify the Kobe unified medium at the time of illegal copying.

Claims

The scope of the claims

1. A method of recording an audio digital signal from a source recording medium to a mass storage medium,

A method for recording on a mass storage medium in which the audio digital signal to be recorded on the mass storage medium is created by adding or subtracting a recording medium specific digital signal to and from the audio portion of the source digital signal.

2. The recording medium specifying digital signal is added or subtracted when the average value and the rate of change of the volume of the source digital signal are greater than or equal to a preset value and the volume of the source digital signal is greater than the average value. Method of recording on mass storage media.

3. The recording method for a master recording medium according to claim 1, wherein the recording medium specific digital signal is added or subtracted at 2 to 5 sampling clocks after the volume of the source digital signal reaches a peak.

4. The recording method according to claim 1, wherein one digit of the recording medium specifying digital signal is repeatedly added and subtracted by a set number of times.

5. The recording on the mass storage medium according to claim 1, wherein the source digital signal obtained by adding or subtracting the recording medium specific digital signal is recorded on the mass storage medium and the recording storage medium as a mass digital signal. Method.

6. After playback, the source digital signal and the master digital signal are separated into three types of signals: a clock signal, an L / R master signal, and a source data signal. The source data signal is a recording medium specific digital signal. The method for recording on a mass storage medium according to any one of claims 1 to 5, wherein the addition and subtraction of the data are performed.

7. A method for identifying a master recording medium of a copy recording medium obtained by duplicating a master recording medium,

The first step of comparing the digital signal read from the Coby storage medium with the recorded and stored source signal by logical operation, and the second step of comparing the logical operation result with the recorded and stored recording medium specifying signal And a method for identifying a mass storage medium comprising:

8. A method for specifying a mass storage medium of a copy recording medium obtained by duplicating a mass storage medium, A / D conversion of the analog signal read from the copy storage medium and comparison with the stored digital signal, and the first signal of the recording medium and the master signal stored and stored If the values match, then a second process of comparing with the source signal, a third process of adding and subtracting the difference between the signal of the copy recording medium and the source signal to the source signal, and a result of the third process are recorded and archived. A fourth process of comparing the master recording medium with the digital signal, and a method of specifying a master recording medium.

9. Music CD software that adds or subtracts a recording medium specific signal to or from the audio part of the audio digital signal to be recorded.