JPH06105535B2 - Recording / reproducing apparatus, reproducing apparatus, recording apparatus, reproducing medium, and transmission method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing for directly recording and reproducing a digital signal, or converting an analog signal into a digital signal for recording, like a digital audio tape recorder (hereinafter referred to as DAT). Device, playback device,
The present invention relates to a recording device, a reproducing medium for recording and reproducing a digital signal, and a transmission system of a digital signal transmitted between the recording / reproducing device or between the reproducing device and the recording device.

[0002]

2. Description of the Related Art In recent years, standardization of interface specifications, which is a transmission method for connecting digital audio signals between audio devices, has progressed, and CD players and satellite broadcast tuners (hereinafter referred to as BS
In addition to the analog output terminal,
Those equipped with a digital output terminal have been commercialized. Also, a reproducing medium such as a DAT tape capable of directly recording and reproducing a digital signal, a recording and reproducing device such as DAT,
Playback devices and recording devices have been put to practical use.

Hereinafter, the above-mentioned recording / reproducing apparatus, reproducing apparatus,
As an example of the recording device, the reproduction medium, and the transmission method, D
AT, CD player, BS tuner, DAT tape,
The digital audio interface will be described with reference to the drawings.

FIG. 3 is a connection diagram of audio equipment centering on DAT, FIG. 4 is a part of a signal format of a digital audio interface, and FIG. 5 is a part of a recording format of DAT.

In FIG. 3, reference numeral 61 is a BS tuner, and 61A and 61D are analog output terminals and digital output terminals of the BS tuner 61. Reference numeral 62 is a CD player, and 62A and 62D are analog output terminals and digital output terminals of the CD player. 63 is DAT, 6
3A and 63D are analog output terminals and digital output terminals of the DAT 63. Reference numeral 64 is an analog audio device such as an FM tuner or analog record player, and 64A is an analog output terminal of the analog audio device 64. 65 and 66 are DAT,
65B and 66B are DAT65 and DAT66 analog input terminals, 65C and 66C are DAT65 and DAT66 digital input terminals, and 65A and 66A are DAT65 and DAT.
66 analog output terminals, 65D and 66D are DAT6
5, DAT66 digital output terminal. From the digital output terminals 61D, 62D, 63D and 65D of each device to the digital input terminals 65C and DAT of the DAT 65
Signals are transferred to and from the digital input terminal 66C of 66 in the format of the transmission system defined as shown in FIG. As shown in FIG. 4A, two subframes of the left channel and the right channel are formed at the time of sampling the analog signal. Each subframe consists of 32 bits as shown in FIG. 4B, and is used for a 4-bit synchronization amble and for extension of auxiliary information and audio data.
It is configured to transfer 20-bit audio data after a bit auxiliary signal . The remaining 4 bits are 1 byte indicating the validity of audio data.
Validity flag, one bit for transmitting other information
Information and output about user data and audio data
1-bit channel for transmitting information such as
1 for detecting status and transmission signal errors
It is a parity bit of the bit, and the channel status of 1 bit in it is 192 as shown in FIG.
It is configured so that 192 bits over the frame have a meaning as one block. The 6 bits from bit 0 to bit 5 of the channel status signal are control bits, and indicate the use of audio data and the propriety of digital copying. That is, when the bit 2 which is the third bit of the control signal in the channel status signal of the signal input to the digital input terminal 65C as shown in FIG. I can't copy. (See, for example, "Electronic Life", Vol. 655, pp. 18-19).

Further, in the case of a copyright-recognized one such as a compact disc, a signal indicating prohibition of direct recording by digital signal (hereinafter referred to as digital copy) is recorded on a reproducing medium like a compact disc, When this compact disc is reproduced, a signal in which bit 2 of the channel status signal becomes "0" is output from the digital output terminal. Therefore, when a compact disc on which such a music source is recorded is reproduced, the signal from the digital output terminal 62D of the CD player 62 has the bit 2 of the channel status signal of "0", and therefore the DA
The T65 cannot record the signal on a recording tape (hereinafter referred to as tape). In the following description, when the bit 2 of the channel status is “0”, this bit 2 is referred to as a copy prohibition bit.

Further, DAT63, DAT65, DAT6
The tape No. 6 has a recording format as shown in FIG.
A main ID for reproducing data is stored in the PCM area in the central part of the tape. The PCM area shown in FIG. 5 (a) consists of 128 blocks, and one block consists of 288 bits as shown in FIG. 5 (b). Main ID is Figure 5
As shown in (c), the format I is skipped by one block.
D, ID1 to ID6, ID7 are repeatedly recorded. As shown in FIG. 5D, when the 2 bits of the format ID is “00”, that is, when the DAT tape records audio data, when the 2 bits of the ID 6 is “00”, the digital copy is performed. It becomes possible, "1
When it is 0 ", digital copying is prohibited. That is, D
The tape recorded by the AT user has ID6 of "00", which enables digital copying. However, in the case of a soft tape such as a music source, if "10" is recorded in ID6, digital copying cannot be performed.

However, recording from the analog output terminal 62A of the CD player 62 to the analog input terminal 65B of the DAT 65 and recording from the analog output terminal 63A of the DAT 63 to the analog input terminal 65B of the DAT 65 (hereinafter referred to as analog copy) is performed. It becomes possible, and the compact disc and the soft tape of DAT can be analog copied even if the digital copy is prohibited. However, in this case, the DA conversion circuit or DAT of the CD player 62
Since it goes through the DA conversion circuit 63 and the AD conversion circuit DAT 65, the sound quality may be slightly deteriorated as compared with the digital copy. Furthermore, the tape that has been analog copied once is shown in FIG.
Since the ID 6 shown in (d) is “00”, digital copies without deterioration of sound quality will be recorded from DAT 65 to D, for example.
Infinitely possible to AT66.

[0009]

As described above,
A system that uses a recording / reproducing device such as a conventional DAT, a reproducing device such as a DAT or a CD, a recording device such as a DAT, a reproducing medium such as a DAT tape, and a transmission system such as a digital audio interface can be enjoyed by an individual. Despite being granted the freedom to record for
Since reproduction media such as compact discs and DAT music soft tapes have a digital copy prohibition signal in the digital signal, the digital signal cannot be directly copied, and the sound quality is slightly deteriorated for the DAT user. Recording with an analog signal will be compelled. Therefore, there is a problem that the advantage of DAT for recording a digital signal cannot be fully utilized.

On the other hand, since the DAT tape which has been analog copied once has the main ID ID6 recorded as "00", digital copying becomes possible infinitely thereafter, and the compact disc and the DAT music soft tape are analog. Although the sound quality is slightly deteriorated during copying, it is possible to make a duplicate product after that by digital copying without deterioration in sound quality. Therefore, there is a problem that it may bring a great disadvantage to the software industry such as music.

That is, conventional recording / reproducing devices such as DAT, reproducing devices such as DAT and CD, recording devices such as DAT, reproducing media such as DAT tapes, and digital discs.
Since the system using the transmission method such as the audio interface discriminates the digital copying by only 1 bit of bit 2 of the channel status signal, the compact disc and the music soft tape of the DAT are never copied by the digital signal. What could not be done, and what has been copied by an analog signal has a problem that an unaltered content can be recorded infinitely thereafter by digital copying.

In view of the above problems, the present invention uses a compact disc or a DAT music tape as a master, and creates a child tape by copying with the DAT based on this master, and based on this child tape. Then, digital copying is possible by limiting the number of generations of copying such as creating a grandchild tape, and when the number of generations exceeds a predetermined number, subsequent digital copying is prohibited from the digitally copied DAT tape. In addition to the above, even for an analog-copied DAT tape, a recording / reproducing apparatus such as DAT, a reproducing apparatus such as DAT or CD, which limits the number of generations of digital copying based on this tape, DA
The present invention provides a recording device such as a T, a reproduction medium such as a DAT tape, and a transmission system such as a digital audio interface.

[0013]

In order to solve the above-mentioned problems, the recording / reproducing apparatus of the present invention is a reproduction medium of a "specific generation" in which the generation does not change even if it is copied from the reproduction medium. If it is a playback medium that updates the generation,
A medium identification means for identifying whether or not the reproduction medium has reached a certain generation and cannot be copied thereafter, a means for converting the generation information obtained from the medium identification means into an output signal, and a copy from the input signal. "Specific generation" where generations will not change
Input signal for identifying whether the input signal is an input signal for updating the recording after copying, or an input signal that reaches a certain generation and cannot be copied thereafter. With the generation information obtained from the input signal of the "specific generation", the generation of which remains the same even when copied,
When the copying is performed, an input signal for updating and recording the generation is made copyable, and a recording control means for controlling whether copying is possible so that the input signal reaching a predetermined generation is made uncopyable,
The input signal that the recording control unit determines that copying is possible, and updates and records the generation when copying, records updated generation information different from the reproduction medium on the recording medium, and the generation remains unchanged even if the copy is performed. The input signal of "generation" is provided with generation information setting means for recording the same generation information as that of the reproduction medium.

Further, the reproducing apparatus of the present invention is a reproducing medium of a "specific generation" in which the generation remains unchanged after copying from the reproducing medium, or a reproducing medium which updates the generation when copied. It is provided with a medium identification means for identifying whether the reproduction medium has reached a certain generation and cannot be copied thereafter, and a means for converting the generation information obtained from the medium identification means into an output signal.

Further, the recording apparatus of the present invention is an input signal of a "specific generation" whose generation does not change even if copied from the input signal, or an input signal which updates and records the generation when copying. Depending on the input discriminating means for discriminating whether or not the input signal reaches a certain generation and cannot be copied thereafter, and the generation information obtained from the input discriminating means, the generation does not change even if the copy is made. , And a recording control means for controlling whether or not copying is possible so that an input signal for updating and recording the generation when copying is made possible, and an input signal having reached a predetermined generation is made uncopyable, and recording control The input signal that the means determines that the copy is possible, and updates and records the generation when copying, records the updated generation information different from the reproduction medium in the recording medium, and the generation remains unchanged even if the copy is performed. Input signals of generations "is one having generation information setting means for recording the same generation information and the reproduction media.

Further, the reproduction medium of the present invention is described as a reproduction medium.
Recorded PCM data divided into predetermined blocks
Is recorded together with the PCM data in the same block unit as
Which is information for reproducing PCM data
Depending on the multiple bits in the ID, the generation is a "specific generation" whose generation does not change even after copying, a generation that updates the generation when copying is performed, or a certain generation is reached and subsequent copying is performed. It includes generation information indicating whether the signal is of a generation that cannot be performed.

[0017] The transmission method of the present invention, the reproduction - the digital signals transmitted between recording devices, digital audio
1 frame for 1 sampling period for connecting devices
And one sampling period consists of two subframes.
1 subframe is composed of a 4-bit synchronization amble
Used to expand 4-bit auxiliary information and audio data
Audio signal and 20-bit audio data
And a 1-bit validator that indicates the validity of the audio data.
Utility flag, 1-bit user data for transmitting other information
Data, information about audio data and output device
1-bit channel status for transmitting information, transmission
1-bit parity bit to detect transmission error
Digital audio system consisting of a total of 32 bits
192 of the channel status of the interface signal
Frames are transmitted as a unit together with audio signals.
Depending on the channel status signal sent, the generation is a "specific generation" whose generation does not change even after copying, a generation that updates the generation when copying is performed, a certain generation is reached, and subsequent copying is performed. Generation information indicating whether the signal is for a generation that cannot be transmitted is transmitted.

[0018]

The present invention has the following actions due to the above-mentioned configuration.

According to another aspect of the present invention, the recording / reproducing apparatus updates and records generation information every time a digital copy is made, and prohibits the digital copy when a predetermined generation is reached.
The number of generations of digital copy can be limited. In addition, when digitally copying a compact disc or DAT music soft tape, the generation information output from the playback device is determined to be digitally copyable by the recording device, and is reproduced by digitally copying the compact disc or DAT music soft tape. By controlling the recording device to discriminate the digital copy prohibition from the generation information output by reproducing the medium, the digital soft copy of the compact disc and the music soft tape of DAT can be performed by limiting the number of copy generations. Become.

According to the second aspect of the present invention, since the recording / reproducing apparatus processes an input signal for which generation information is not obtained as an input signal for updating and recording the generation when copying, a digital copy of the reproducing medium recorded by the present recording / reproducing apparatus. You can limit the number of generations.

According to a third aspect of the present invention, a reproducing apparatus outputs a generation information to update and record the generation information at the time of digital copying, or a recording apparatus that discriminates a predetermined generation incapable of digital copying and prohibits digital copying. By combining them, the number of generations of digital copy can be limited.

According to another aspect of the present invention, the recording apparatus updates the generation information each time a digital copy is made, records the information, and prohibits the digital copy when a specific generation is reached, thereby combining with the reproduction apparatus that outputs the generation information. By doing so, the number of generations of digital copy can be limited.

Since the recording apparatus according to the fifth aspect processes an input signal for which generation information is not obtained as an input signal for updating and recording the generation when copied, the reproduction medium recorded by the recording apparatus is recorded with the generation information. When attempting to make a digital copy in combination with an output reproducing device, the number of generations of digital copy digital copy can be limited.

According to a sixth aspect of the present invention, there is provided a reproduction medium of a predetermined block unit.
In the same block unit as the PCM data divided into units
Playback of PCM data recorded with PCM data
By the multiple bits in the main ID, which is the information for
Ri, whether the generation of a signal for updating the generation when the copy, reaches a predetermined generation, by including generation information indicating which generation signal can not be copied later, the reproducing apparatus which outputs the generation information Then, the generation information is discriminated, and the generation information is updated and recorded every time a digital copy is made.
The number of generations of digital copy can be limited by combining with a recording device that prohibits digital copy when the specific generation is reached.

The transmission method according to claims 7 , 8 and 9 is a signal of a generation that updates the generation when a copy recorded on a reproduction medium is made, or a signal of a generation that reaches a specific generation and cannot be copied thereafter. Digital generation information indicating
Audio interface signal channel status
Channels transmitted as one unit for 192 frames
The digital status signal together with the audio signal
Channel stay of audio interface signals
It is transmitted as one unit in 192 frames of the task.
With the audio signal by the channel status signal,
By transmitting from the playback device to the recording device, the recording device determines the generation information, updates the generation information each time a digital copy is made, and records it. When the specific generation is reached, the digital copy is prohibited, The number of generations of digital copy can be limited.

[0026]

Embodiments of the recording / reproducing apparatus, reproducing apparatus, recording apparatus, reproducing medium, and transmission system of the present invention will be described below.
An audio system centering on DAT will be described in detail with reference to the drawings.

FIG. 1 shows a DAT in one embodiment of the present invention.
It is a block diagram. In FIG. 1, 1 is an analog input terminal
Child, 2 is AD converter,3 is shown in (a) and (b) of FIG.
Shown here is the transmission of digital audio equipment.
The pulling period is one frame, and one sampling period is
It consists of two subframes, and one subframe is
4-bit sync amble and 4-bit auxiliary information and audio
Audio signal and 20-bit signal used for extension of audio data
Audio data and the validity of the audio data
1-bit validity flag indicating that other information is transmitted
1-bit user data and audio data
1-bit channel that transmits information indicating the output device and output device
Channel status, 1 for detecting transmission signal error
Digitizer consisting of a total of 32 bits of parity bits
For inputting audio interface signals
Digital input terminal,4 is a transmission system according to an embodiment of the present invention.
Therefore,Digital audio input to digital input terminal 3
Demodulates audio interface signalsDigital input
Decoder 5 is the output signal of AD converter 2 or digital
A selection switch for selecting the output signal of the input decoder 4,
6 is an interface for transposing the digital signals in time.
Leave processing, addition of error correction code, subcode described later
Recording signal processing for adding an output signal of the encoder 13
Logic circuit, 7 is a recording amplifier, 8 is a recording head, and 9 is the present invention.
3 is a magnetic tape which is a reproduction medium of one embodiment. 10 is
Of the output signal of the digital input decoder 4Digital audio
Channel status signal in the radio interface signal
2 when 192 frames are used as one unit
Is a copy inhibition bit determination unit that determines whether or not is "0"
It 11 isAs shown in (b) and (c) of FIG.
Bit 3 in the digital audio interface signal
A single 192 frames of 0 channel status
Bit of the channel status signal when transmitted as
Category code consisting of 8 to 15 bits
But,For example, a signal indicating that the signal is generally from DAT
No. or a signal from DAT, but copy prohibit bit
To enable digital copying with or without
Category code (hereinafter referred to as DAT-C)
That indicates that the signal is from a category other than DAT
In the category code determination unit that determines whether it is another code
is there. 12 is a copy prohibited bit in the case of digital copy.
Output signal of the discriminating unit 10 and the category code discriminating unit 11
From the output signal of the main ID6 shown in FIG.
For example, as shown in Table 1, in the case of analog copy,
ID6 is a copy control signal generation unit that becomes "01".

[0028]

[Table 1]

13 is shown in FIGS. 5 (a), 5 (b) and 5 (c).
As shown, the PCM data is divided into predetermined blocks.
Data in the same block unit as the PCM data.
Plays back PCM data recorded with PCM data
It includes ID6, which is a part of the main ID that is information for
A sub-code encoder for creating a free subcode.
Reference numeral 14 is an operation switch including a recording switch, a reproduction switch, and an input selection switch for switching between recording a signal input to the analog input terminal 1 and copying a signal input to the digital input terminal 3, and 15 is the input It is an input setting unit that controls the selection switch 5 according to the changeover switch and controls the ID 6 to be “01” in the case of analog copy. Reference numeral 16 is a recording prohibition setting unit that controls the recording signal processing circuit 6 to prohibit recording when the copy prohibition bit determination unit 10 detects the copy prohibition bit and the category code determination unit 11 detects the DAT category code. . 28 is a reproducing head, 17 is a reproducing amplifier,
Reference numeral 18 denotes a reproduction signal processing circuit for performing error correction of digital signals and deinterleaving processing for restoring the temporal arrangement.
Reference numeral 19 is a DA converter, and 20 is an analog output terminal. Reference numeral 21 denotes a subcode decoder for obtaining a signal such as a main ID, and 22 denotes digital copy control for obtaining bit 2 and a category code of a channel status signal from ID6 which is an output signal of the subcode decoder 21 as shown in Table 2, for example. It is a signal determination unit.

[0030]

[Table 2]

Numeral 29 indicates that bit 2 of the channel status is set to "0" when the copy control signal judging section 22 judges that there is a copy prohibition bit, and "1" otherwise.
It is a copy prohibition bit setting unit that sets so that
A category code setting unit 30 sets "11000000" when the copy control signal generating unit 22 outputs DAT, and sets a corresponding 8-bit category code when outputting DAT-C. 23 is the output signal of the copy prohibition bit setting unit 29 and the category code setting unit 30
To obtain the channel status signal shown in FIG.
It is a channel status encoder . Oh 25 shown from such an output signal of the output signal and channel status encoder 23 of the reproduction signal processing circuit 18, in FIG. 4 (a), (b)
Transmits channel status signals, etc. along with audio signals
Is a digital audio interface signal that
A digital output encoder for obtaining a digital output signal , 26
Outputs a digital audio interface signal
That is a digital output terminal. Reference numeral 27 denotes a system controller including a copy control signal generation unit 12, an input setting unit 15, a recording prohibition setting unit 16, a copy control signal determination unit 22, a copy prohibition bit setting unit 29, a category code setting unit 30, and the like. It is composed of a microcomputer.

Focusing on the DAT configured as described above,
An operation of a recording / reproducing apparatus, a reproducing apparatus, a recording apparatus, a reproducing medium, and a transmission system of the present invention will be described below with reference to the drawings and tables. FIG. 2 is a flowchart showing a part of the processing of the system controller 27.

First, when a compact disc is digitally copied, the digital input terminal 3 of the recording side DAT is shown in FIG.
When the signals shown in (a) and (b) are input, the input changeover switch of the operation switch 14 is set to digital copy, and the recording switch is pressed, the system controller 27 causes the recording switch to switch in decision step 36 in FIG. It is determined that is pressed, and the process goes to a determination step 37. In the judgment step 37, it is judged that the digital copy is set, and the processing step 38 is reached, and the input setting section 15 inputs the output signal to the digital input decoder 4 to the selection switch 5 to the recording signal processing circuit 6. And the decision step 39 is reached. In the judgment step 39, the copy inhibition bit judgment unit 10 inputs the output signal of the digital input decoder 10 and checks bit 2 of the channel status signal. Since bit 2 when a compact disk or a DAT soft tape is reproduced is a signal indicating digital copy inhibition, that is, "0", it is determined that there is a copy inhibition bit, and the determination step 40 is reached. In the discrimination step 40, the category discrimination unit 11 inputs the output signal of the digital input decoder 4, checks bits 8 to 15 of the channel status, and in order to discriminate that the disc is a compact disc, the process proceeds to the processing step 42.
In the processing step 42, the copy control signal generator 12
Outputs a signal whose ID6 is “10” from Table 1 to the subcode encoder 13. Then process step 53
At, the system controller 27 sets the recording mode. The output signal of the subcode encoder 13 including the ID 6 and the output signal of the selection switch 5 are recorded on the magnetic tape 9 by the recording head 8 via the recording signal processing circuit 6 and the recording amplifier 7. Therefore, even a compact disc can be digitally copied.

Next, a tape obtained by digitally copying a compact disc or a soft tape of DAT is reproduced by DAT,
A case will be described in which the reproduced digital output signal is digitally copied by another DAT.

When the reproduction switch in the operation switch 14 of the reproduction side DAT is pressed, the system controller 27 recognizes that the reproduction switch has been pressed in the judgment step 46, and reproduces the signal recorded on the magnetic tape 9 from the reproduction head. Two
8 reproduces, passes through the reproduction amplifier 17 and the reproduction signal processing circuit 18, and converts the digital signal of the audio signal into the DA converter 1
9 and the digital output encoder 25, and the subcode signal is input to the copy control signal discriminating unit 22 through the subcode decoder 21. In decision step 47,
The copy control signal discriminating unit 22 discriminates that the ID6 is "10" and reaches the processing step 48. According to Table 2, the copy prohibition bit setting unit 29 sets the bit 2 of the channel status signal to "0". And outputs a command to the channel status encoder 23. Next, in the determination step 49, since the ID6 is "10", the process proceeds to the processing step 52, and the category code setting unit 30 indicates "1100" to the channel status encoder indicating DAT.
A command is output to set a code of "0000". The channel status encoder 23 creates the signal shown in FIG. 4 (c).
The digital output encoder 25 uses the output signals of the channel status encoder 23 and the reproduction signal processing circuit 18 to
The digital signal shown in FIGS. 4A and 4B is obtained and output from the digital output terminal 26. If this signal is connected to the digital input terminal 3 of the recording side DAT and a digital copy is to be made, the copy prohibition bit discriminating section 10 discriminates that there is a copy prohibition bit in the judgment step 39 of the system controller 27 of the recording side DAT, and makes a judgment. In step 40, the category code determination unit 11 determines that it is DAT. Therefore, in processing step 41, it is determined that the digital copy is prohibited as shown in Table 1, and the recording prohibition setting unit 16 prohibits the recording by, for example, blocking the signal output from the recording signal processing circuit 6 to the recording amplifier 7. . Therefore, the digital copy cannot be performed again by DAT based on the tape on which the signal of the compact disc has been digitally copied once.

Although a compact disc has been described above as an example, the same applies to a digital copy from another category as long as the signal includes a copy inhibition bit.

Next, only the difference in the case of recording a signal which does not include the copy prohibition bit like the BS tuner and digitally copying this tape will be described, only different from the case of digitally copying the signal of the compact disc described above. .

When the digital output signal of the BS tuner is input to the digital input terminal 3, in the decision step 39, the copy prohibition bit discrimination section 10 discriminates that the bit 2 of the channel status is "1", that is, there is no copy prohibition bit, and the processing step 43. In the processing step 43, the copy control signal generator 12 sets the ID 6 to “00”.
And outputs a signal to the subcode encoder 13. In this way, the tape digitally copied from the BS tuner is reproduced by DAT, and the reproduced digital output signal is
When performing digital copy with another DAT, the ID of the playback signal
6 is “00”, the copy control signal determination unit 22 determines that the copy inhibition bit setting unit 2 is in the determination step 47.
The command is output so that the copy prohibition bit is not written to 9,
A command is output to the category code setting unit 30 to output a category code indicating DAT. Processing step 51
At, the copy inhibition bit setting unit 29 outputs a command to the channel status encoder 23 so that the bit 2 of the channel status becomes "1". The signal reproduced from the digital output terminal 26 in this manner is transferred to another DA.
When a digital copy is made by connecting to the digital input terminal 3 of T, since the copy prohibition bit is not included, the digital copy becomes possible, and the digital copy for many generations thereafter becomes possible.

Next, the case where the signal input from the analog input terminal 1 is analog-copied and this tape is digital-copied will be described.

When the input switch of the operation switch 14 on the recording side DAT is set to analog copy and the recording switch is pressed, the system controller 27 makes a decision step 36.
In step S37, it is determined that the recording switch 7 is being pressed, and the determination step 37 is reached. When the analog copy is determined in the determination step 37, the signal input to the analog input terminal 1 and converted into the digital signal by the AD converter 2 is input to the selection switch 5 in the processing step 44 . The input setting unit 15 controls the selection switch 5 to select the output of the AD converter 2, and in the processing step 45, outputs a control signal to the copy control signal generation unit 12 so that ID6 becomes “01”. . Next, in processing step 53, the subcode signal including ID6 and the output signal of the selection switch 5 are recorded on the magnetic tape 9 and analog copy is performed. The tape thus recorded is referred to as a first-generation tape.

When the second generation tape is made by digitally copying the first generation tape, when the first generation tape is reproduced, the system controller 27 of the reproduction side DAT.
In the processing step 46 of 1., the reproduction head 28 reproduces the signal recorded on the magnetic tape 9 by recognizing that the reproduction switch has been pressed, and the digital signal of the audio signal is transmitted through the reproduction amplifier 17 and the reproduction signal processing circuit 18. To the DA converter 19 and the digital output encoder 25,
The subcode signal is input to the copy control signal discriminating unit 22 via the subcode decoder 21. Decision step 47
In the copy control signal discrimination unit 22, the ID 6 is "0".
1 ", and in process step 48, a command is output from table 2 to add the copy inhibit bit to the copy inhibit bit setting section 29, and in decision step 49 the copy control signal discriminating section 22 category. A command is output to the code setting unit 30 to output a category code corresponding to DAT-C. The category code setting unit 30 can digitally copy to the channel status encoder 23 regardless of the presence or absence of the copy prohibition bit. 4C, the channel status encoder 23 obtains the signal shown in Fig. 4C, and subsequently, in the processing step 54, the digital output encoder 25 is output.
4 obtains the digital signals shown in FIGS. 4A and 4B from the output circuits of the channel status encoder 23 and the reproduction signal processing circuit 18, and outputs them from the digital output terminal 26. When the signal from the digital output terminal 26 including this signal is digitally copied by another DAT, in the judgment step 37 of the system controller 27 of the recording side DAT,
When it is determined that the digital copy is set, the process proceeds to step 38, and the input setting section 15 sets the selection switch 5 so that the output signal of the digital input decoder 4 is input to the recording signal processing circuit 6 and makes a determination. Step 39 is reached.
In the determination step 39, the copy inhibition bit determination unit 1
0 inputs the output signal of the digital input decoder 4 and checks bit 2 of the channel status signal. Since bit 2 when the first generation tape is reproduced is "0", it is judged that there is a copy prohibition bit, and the judgment step 40 is reached. In the discrimination step 40, the category code discrimination portion 11 inputs the output signal of the digital input decoder 4, checks bits 8 to 15 of the channel status, discriminates that it is DAT-C and reaches the processing step 42. The copy control signal generator 12 sets the ID6 to be “10” from Table 1. The tape thus digitally copied is referred to as a second generation tape.

Similarly, when the third generation tape is produced by digitally copying the second generation tape, when the second generation tape is reproduced, the copy control signal discriminating unit 22 of the reproduction side DAT outputs ID6. When it is determined that it is "10", the process reaches step 48, and the copy inhibition bit setting unit 29 outputs a command to the channel status encoder 23 so that bit 2 of the channel status signal becomes "0". Next, in the determination step 49, since the ID 6 is “10”, the processing step 52 is reached, and the category code setting unit 30
Outputs a command to the channel status encoder 23 to set a code of "11000000" indicating DAT. Then, the channel status encoder 23 obtains the signal shown in FIG. Subsequently, in process step 54, the digital output decoder 25
4 obtains the digital signals shown in FIGS. 4A and 4B from the output signals of the channel status encoder 23 and the reproduction signal processing circuit 18, and outputs them from the digital output terminal 26. The signal from the digital output terminal 26 is recorded D
When a digital copy is made by inputting to the digital input terminal 3 of the AT, the copy inhibition bit determination unit 10 determines in the determination step 39 of the system controller 27 that there is a copy inhibition bit, and in the determination step 40,
The category code determination unit 11 determines that it is DAT. At step 41, it is determined that digital copying is prohibited as shown in Table 1. As a result, the recording prohibition setting unit 16 prohibits recording by, for example, blocking the signal output from the recording signal processing circuit 6 to the recording amplifier 7. Therefore, the third generation tape by digital copy cannot be made.

As described above, in the transmission method for connecting DATs, copy generation information can be transmitted by a signal composed of a plurality of bits of a channel status signal of a digital signal. That is, by combining the copy prohibition bit and the category code, for example, a “specific generation” generation that does not change even if the copy is prohibited, a copy prohibition bit and a reproduction device such as a copyrighted work The "generation that updates the generation when copying is performed" by the combination of the category codes shown "The generation that reaches a certain generation and cannot make subsequent copies" can be transmitted by the combination of the copy prohibition bit and the category code indicating the recording / reproducing device .

Further, in the DAT which is the recording device or the recording / reproducing device, the copy prohibition bit discriminating section and the category code discriminating section which are the input discriminating means determine from the generation information of the digital input signal that "the generation does not change even if copied. “Specific generation” input signal ”,“ input signal to update and record generation when copying ”, or“ input signal that reaches a certain generation and cannot be copied thereafter ”, Based on the generation information obtained from the input identification means, the recording prohibition setting section, which is a means for controlling whether or not recording is possible, displays a “specific generation input signal whose generation remains unchanged even if copied” and “copy Then, the "input signal for updating and recording the generation" can be recorded, and the "input signal that reaches a certain generation and cannot be copied thereafter" cannot be recorded. The recordable signal is a copy which is a generation information setting means. The control signal generation unit records an input signal of "specific generation" whose generation remains unchanged even when copied, with ID6 indicating the same generation information as the reproduction medium, and updates and records the generation when copied. Records ID6, which is different from the reproduction medium and indicates updated generation information.

Therefore, 2-bit generation information is recorded as ID6 on the magnetic tape which is the reproducing medium, and the "specific generation" or "copy" in which the generation does not change even if copied. The generation that updates the generation when you do
Or, include any generation information of "a generation that has reached a certain generation and cannot be copied thereafter" together with the PCM data.
Becomes Furthermore, the reproduction medium of the present invention stores generation information.
Record in the same block unit as digitalized PCM data
Therefore, change only the generation information and set the copy limit.
The effect is that it cannot be avoided.

Further, the subcode decoder, which is the medium identifying means, of the DAT which is the reproducing apparatus or the recording / reproducing apparatus,
From the value of the reproduced copy control subcode signal ID6, "a specific generation in which the generation remains unchanged even if copied"
Reproduction medium "," reproduction medium that updates the generation when copied ", or" reproduction medium that reaches a certain generation and cannot be copied thereafter ", and generation information obtained from the medium identification means To the output signal, the copy inhibition bit setting unit and the category code setting unit can convert the ID6 generation information into a channel status signal and output it.

As a result, unlike the conventional case where the digital copy of the compact disk or the DAT soft tape is prohibited by the 1-bit signal, the number of generations of the copy is generated even in the compact disk or the DAT soft tape. This makes it possible to perform digital copying by limiting the above, and does not force the DAT user to record an analog signal whose sound quality is slightly deteriorated.

Further, as in the present embodiment, the generation information is obtained by combining the copy prohibition bit which is bit 2 of the channel status signal which is the conventional copy control signal and the category code from bit 8 to bit 15. Once transmitted, there is no need to change traditional digital audio equipment such as compact discs. Moreover, conventional
Digital audio interface standardized by
To utilize the channel status signal of the base signal
More CD players and other playback devices already on the market.
DAT that will be introduced to the market in the future without changing the location.
Apply this transmission method to any digital recording / reproducing device
As a result, the
When connecting digital audio equipment,
It has the unique effect of managing the number of generations.
It Furthermore, copy of bit 2 is prohibited for generation information transmission.
By using the bit, the following "1."
In the combination of "2."
Yes, by controlling whether the generation can be updated or not
It goes without saying that you can limit the number of copies
Not only in the following combination of "3.",
It is possible to control whether copying can be performed as before,
It has the unique effect of having interchangeability. 1. From the playback device having the transmission system of the present invention, the transmission of the present invention is performed.
Digital copy to a recording device that has a transmission method. 2. Transmission of the present invention from a playback device having a conventional transmission method
Digital copy to recording device with method. 3. From the playback device having the transmission method of the present invention to the conventional transmission
Digital copy to recording device with method.

In the above description, the 2-bit copy control signal ID6 has been described as generation information. However, there is an undefined portion in the subcode signal area of DAT, and the channel status as shown in FIG. The signal also has an unused part. Therefore, it is also possible to use generation information in which the number of bits is increased according to the number of copy generations.

An input signal, such as an analog signal, for which generation information cannot be obtained is recognized as an input signal for updating and recording the generation when copying is performed, and the input setting is a recording generation information setting unit for processing. Since the reproduction medium once recorded with an analog signal is limited in the number of generations of digital copy after that, a compact disc or a DAT is provided.
It becomes impossible to make unlimited copies of music soft tapes with less deterioration in sound quality by digital copying after analog copying.

As an example of a signal for which generation information is not obtained, limiting the number of copy generations when a signal from a CD player or a DAT analog output terminal is converted into a digital signal for analog copying As described above, when an analog signal is converted into a digital signal by using an AD converter as an external device and the digital signal is directly input to the digital input terminal of the DAT and digitally copied, the output signal of the AD converter is generally Since the copy prohibition bit is not added, it becomes possible to record to DAT from a copyrighted material such as a CD.
The same problem as the analog copy occurs that the subsequent digital copies can be unlimitedly performed. Therefore, when digital copying is performed using an AD converter as an external device, that is, when the category code determination unit determines a signal indicating the AD converter, the copy control sub-code signal ID6 is converted into the analog of the above-described embodiment. If it is set in the same manner as copying, it is possible to limit the number of generations of digital copying thereafter.

[0052]

As described above, the recording / reproducing apparatus such as DAT, the reproducing apparatus such as DAT and CD, the recording apparatus such as DAT, the reproducing medium such as DAT tape, and the transmission of the digital audio interface and the like according to the present invention as described above. In the system using the method, the generation information consisting of a plurality of bits is used as a condition for permitting digital copying, the generation information recorded on the reproduction medium is reproduced and output by the reproduction device or the recording / reproduction device, and this generation information is transmitted. The system transmits, and the recording device or the recording / reproducing device has the following effects by updating and recording this generation information or prohibiting digital copying when a specific generation is reached.

Even with a reproducing medium such as a compact disc or a music soft tape of DAT, it is possible to directly copy a digital signal, forcing the DAT user to record an analog signal whose sound quality is slightly deteriorated. There is no.

Further, the number of generations of subsequent digital copies is limited in the reproduction medium once recorded with an analog signal, and a compact disc or a music soft tape of DAT is a duplicate product with little deterioration in sound quality due to the digital copy after the analog copy. You can't make unlimited. As a result, it is less likely to cause enormous penalties to the software industry such as music.

[Brief description of drawings]

FIG. 1 is a block diagram of a DAT according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the processing of the system controller of FIG.

FIG. 3 is a connection diagram of audio equipment centering on DAT.

FIG. 4 is a format diagram showing a main part of a signal format of a digital audio interface.

FIG. 5 is a format diagram showing a main part of a DAT recording format.

[Explanation of symbols]

 3 Digital Input Terminal 10 Copy Prohibition Bit Discrimination Section 11 Category Code Discrimination Section 12 Copy Control Signal Generation Section 13 Subcode Encoder 15 Input Setting Section 16 Recording Prohibition Setting Section 21 Subcode Decoder 22 Copy Control Signal Discrimination Section 23 Channel Status Encoder 26 Digital Output terminal 27 System controller 29 Copy prohibited bit setting section 30 Category code setting section

Claims (9)

[Claims] 1. A recording / reproducing apparatus including the following components: Input identification means for identifying the following three types of generation information from the input signal: a. “Specific generation” input signal whose generation is invariant even if copied, b. An input signal that updates and records the generation when copying, c. 1. An input signal that reaches a certain generation and cannot be copied thereafter. Means for controlling whether or not an input signal can be recorded under the following conditions based on the generation information obtained from the input identification means: a. Enables recording of “specific generation” input signals whose generation remains unchanged even when copied, b. When copying, the generation signal is updated and the input signal to be recorded can be recorded, c. 2. Input signals that reach a certain generation and cannot be copied thereafter are made unrecordable. Generation information setting means for setting generation information to be recorded on a recording medium as follows: a. In the case of a "specific generation" in which the generation remains unchanged even if the input signal is copied, record the same generation information as the input signal, b. If the generation can be updated and recorded when the input signal is copied, the updated generation information different from the input signal is recorded. 4. Medium identification means for identifying the following three types of generation information from the reproduction medium: a. “Specific generation” playback media whose generation remains unchanged even after copying, b. A playback medium that updates the generation when copied, c. 4. A playback medium that has reached a certain generation and cannot be copied thereafter. Means for converting the generation information obtained from the medium identifying means into an output signal, 2. A recording / reproducing apparatus including the following components: Input identification means for identifying the following three types of generation information from the input signal: a. “Specific generation” input signal whose generation is invariant even if copied, b. An input signal that updates and records the generation when copying, c. 1. An input signal that reaches a certain generation and cannot be copied thereafter. Means for controlling whether or not an input signal can be recorded under the following conditions based on the generation information obtained from the input identification means: a. Enables recording of “specific generation” input signals whose generation remains unchanged even when copied, b. When copying, the generation signal is updated and the input signal to be recorded can be recorded, c. 2. Input signals that reach a certain generation and cannot be copied thereafter are made unrecordable. Generation information setting means for setting generation information to be recorded on a recording medium as follows: a. In the case of a "specific generation" in which the generation remains unchanged even if the input signal is copied, record the same generation information as the input signal, b. If the generation can be updated and recorded when the input signal is copied, the updated generation information different from the input signal is recorded. 4. For input signals for which generational information is not obtained, when copying, it is recognized as an input signal for updating and recording the generation,
Recording generation information setting means for processing. 5. Medium identification means for identifying the following three types of generation information from the reproduction medium: a. “Specific generation” playback media whose generation remains unchanged even after copying, b. A playback medium that updates the generation when copied, c. 5. A playback medium that has reached a certain generation and cannot be copied thereafter. Means for converting the generation information obtained from the medium identifying means into an output signal, 3. A playback device including the following components: Medium identification means for identifying the following three types of generations from the reproduction medium; a. “Specific generation” playback media whose generation remains unchanged even after copying, b. A playback medium that updates the generation when copied, c. A playback medium that has reached a certain generation and cannot be copied thereafter. A means for converting the generation information obtained from the medium identifying means into an output signal. 4. A recording device comprising the following components: Input identification means for identifying the following three types of generation information from the input signal: a. “Specific generation” input signal whose generation is invariant even if copied, b. An input signal that updates and records the generation when copying, c. 1. An input signal that reaches a certain generation and cannot be copied thereafter. Means for controlling whether or not an input signal can be recorded under the following conditions based on the generation information obtained from the input identification means: a. Enables recording of “specific generation” input signals whose generation remains unchanged even when copied, b. When copying, the generation signal is updated and the input signal to be recorded can be recorded, c. 2. Input signals that reach a certain generation and cannot be copied thereafter are made unrecordable. Generation information setting means for setting generation information to be recorded on a recording medium as follows: a. In the case of a "specific generation" in which the generation remains unchanged even if the input signal is copied, record the same generation information as the input signal, b. If the generation can be updated and recorded when the input signal is copied, the updated generation information different from the input signal is recorded. 5. A recording device comprising the following components: Input identification means for identifying the following three types of generations from the input signal: a. “Specific generation” input signal whose generation is invariant even if copied, b. An input signal that updates and records the generation when copying, c. 1. An input signal that reaches a certain generation and cannot be copied thereafter. The generation information obtained from the input identification unit, then indicates
Means for controlling whether or not the input signal can be recorded depending on the condition ; Enables recording of “specific generation” input signals whose generation remains unchanged even when copied, b. When copying, the generation signal is updated and the input signal to be recorded can be recorded, c. 2. Input signals that reach a certain generation and cannot be copied thereafter are made unrecordable. Set the generation information to be recorded on the recording medium as follows.
Generation information setting means for: a. An input signal of a "specific generation" whose generation remains unchanged even after copying records the same generation information as the reproduction medium, b. When copying, the input signal that updates and records the generation records the updated generation information, which is different from the playback medium. 4. For input signals for which generational information is not obtained, when copying, it is recognized as an input signal for updating and recording the generation,
Recording generation information setting means for processing. 6. A PCM device divided into predetermined blocks.
Data in the same block unit as the PCM data.
Plays back PCM data recorded with PCM data
The main ID which is information for
A playback medium containing one of the following three types of generation information with a plurality of bits : a. "Specific generation" generations whose generations remain unchanged after copying, b. Generation that updates the generation when copying, c. A generation that has reached a certain generation and cannot copy after that. 7. A digital audio device is connected to each other,
One sampling period is one frame and one sampling
The period consists of two subframes and one subframe.
Reme, sync amble, auxiliary information and audio data
Signal used to extend the
The audio data, and at least the channel status
Digital audio consisting of multiple types of additional information including
The check of the interface signal over multiple frames.
The channel status is treated as one unit and the audio data is
Channel status signal transmitted with the
A transmission method for transmitting the following three types of generation information: a. "Specific generation" generations whose generations remain unchanged after copying, b. Generation that updates the generation when copying, c. A generation that has reached a certain generation and cannot copy after that. 8. A digital audio device is connected to each other,
One sampling period is one frame, and one sample
The ringing period consists of two sub-frames and one sub-frame.
The subframe consists of a 4-bit sync amble, auxiliary information and
4-bit audio used to extend audio data
Audio signal, 20-bit audio data, the audio
A 1-bit validity flag that indicates the validity of the data
1-bit user data for transmitting other information,
Information about audio data and information about output devices
1-bit channel status for transmission, and transmission
1-bit parity bit to detect transmission error
Digital audio system consisting of a total of 32 bits
192 of the channel status of the interface signal
The audio data with each frame as one unit
Bit 2 of the channel status signal transmitted with
The combination of the copy prohibition bit and multiple other bits
More, the transmission system for transmitting the following three types of generation information. a. "Specific generation" generations whose generations remain unchanged after copying, b. Generation that updates the generation when copying, c. A generation that has reached a certain generation and cannot copy after that. 9. A digital audio device is connected to each other,
One sampling period is one frame, and one sample
The ringing period consists of two sub-frames and one sub-frame.
The subframe consists of a 4-bit sync amble, auxiliary information and
4-bit audio used to extend audio data
Audio signal, 20-bit audio data, the audio
A 1-bit validity flag that indicates the validity of the data
1-bit user data for transmitting other information,
Information about audio data and information about output devices
1-bit channel status for transmission, and transmission
1-bit parity bit to detect transmission error
Digital audio system consisting of a total of 32 bits
192 of the channel status of the interface signal
When the frame is transmitted as one unit,
2 copy prohibition bit and bits 8 to 15
9. The transmission method according to claim 8, wherein the generation information is transmitted in combination with the category code in the above item.