JPH04252467A - Recording/playback device and recording device - Google Patents

Abstract

PURPOSE:To limit the number of generations of following digital copy even when a reproducing medium is analog-recorded at first. CONSTITUTION:This device is provided with a feature that a copy control signal generating part 12 in which a copy control subcode signal of plural bits to be recorded on the reproducing medium and representing the feasibility of the digital copy of a reproducing signal attain to the prescribed valve when an analog signal transferred between equipment is recorded, and a copy control signal conversion part 22 which obtains a copy control signal which limits the number of generations of the following digital copy when an analog-recorded tape 9 is reproduced are provided. The number of generations of digital copy of an analog-recorded reproducing medium can be limited even by combining a recording and reproducing device and a recorder in this invention and conventional reproducing device and recorder.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording/reproducing apparatus and a recording apparatus, such as a digital audio tape recorder (hereinafter referred to as DAT), which converts an analog signal into a digital signal and records the signal.

0002

[Background Art] In recent years, the standardization of interface specifications, which is a transmission method for connecting audio devices using digital signals, has progressed, and the standardization of interface specifications has progressed.
In addition to the analog output terminal, there is a
Products equipped with digital output terminals have been commercialized. In addition, recording/reproducing devices and recording devices such as DAT, which can convert analog signals into digital signals, record and reproduce them, have been put into practical use.

[0003] Hereinafter, as an example of the above-mentioned recording/reproducing apparatus and recording apparatus, a DAT will be explained with reference to the drawings.

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

In FIG. 3, 61 is a BS tuner, and 61A and 61D are analog output terminals and digital output terminals of the BS tuner 61. 62 is a CD player, and 62A and 62D are analog output terminals and digital output terminals of the CD player. 63 is DAT; 63
A and 63D are analog output terminals and digital output terminals of the DAT63. 64 is an analog audio device such as an FM tuner or an analog record player, and 64A is an analog output terminal of the analog audio device 64. 65 and 66 are DAT, respectively, and 6
5B, 66B are analog output terminals of DAT65, DAT66, 65C, 66C are digital input terminals of DAT65, DAT66, 65A, 66A are DAT65, DAT6
6 analog output terminal, 65D, 66D are DAT65,
This is the digital output terminal of DAT66. From the digital output terminals 61D, 62D, 63D and 65D of each device,
Digital input terminal 65C of DAT65 and DAT66
Signals are exchanged at the digital input terminal 66C in a specified transmission format as shown in FIG. As shown in FIG. 4(a), two subframes, a left channel and a right channel, are configured at the time when an analog signal is sampled. Each subframe consists of 32 bits as shown in FIG. 4(b), including a 4-bit synchronization amble,
It is configured to transfer 20-bit audio data after the 4-bit error signal. The channel status signal, which is 1 bit of the remaining 4 bits, is configured to have meaning as one block of 192 bits, as shown in FIG. 4(c). Six bits from bit 0 to bit 5 of the channel status signal are control bits and indicate the purpose of the audio data and whether or not digital copying is possible. That is, when bit 2 of the channel status signal of the signal input to the digital input terminal 65C is "0", the DAT 65 cannot perform digital copying. (For example, see "Electronics Life," Volume 655, pages 18-19.) Also, for copyrighted items such as compact discs, there is a signal on the playback medium that indicates prohibition of digital copying, such as compact discs. When this compact disc is played back, bit 2 of the channel status signal will be “
0" is output from the digital output terminal. Therefore, when playing a compact disc on which such a music source is recorded, the signal from the digital output terminal 62D of the CD player 62 is output from the bit of the channel status signal. Since 2 is "0", the DAT65 cannot record.

[0006] Also, DAT63, DAT65, DAT6
The tape No. 6 has the recording format shown in Figure 5, and the PCM data in which the audio signal is encoded and the main ID for playing back the PCM data are located in the center of the tape.
It is stored in the CM area. The PCM area shown in FIG. 5(a) consists of 128 blocks, and one block is shown in FIG. 5(b).
It consists of 288 bits as shown in . The main ID is shown in Figure 5.
As shown in (c), format I is inserted one block at a time.
D, ID1 to ID6, ID7 are repeatedly recorded. As shown in Figure 5(d), when the 2 bits of the format ID are "00", that is, the DAT tape records audio data, and the 2 bits of the ID 6 are "00", the digital copy is Now possible, “10
”, digital copying is prohibited. In other words, DA
A tape recorded by a T user has ID6 set to "00" and can be digitally copied, but in the case of a soft tape such as a music source, if "10" is recorded in ID6, digital copying is not possible.

However, recording from the analog output terminal 62A of the CD player 62 to the analog input terminal 65B of the DAT65, or recording from the analog output terminal 63A of the DAT63 to the
Recording to the analog input terminal 65B of the AT65 becomes possible, and analog copying of compact discs and DAT soft tapes becomes possible even if digital copying is prohibited. However, in this case, the DA conversion circuit of the CD player 62 or the DA conversion circuit of the DAT 63, and the DA conversion circuit of the DAT 65
Because it goes through an AD conversion circuit, there may be some sound quality deterioration compared to a digital copy. Furthermore, since the ID6 shown in FIG. 5(d) becomes "00" for a tape that has been analog-recorded once, digital copying without deterioration of sound quality can be performed indefinitely, for example, from DAT65 to DAT66.

[0008]

[Problem to be solved by the invention] As explained above,
With conventional DAT, the DAT is recorded once as an analog signal.
Since the main ID ID6 of the tape is recorded as "00", unlimited digital copying is possible from then on.
Although the sound quality of compact discs and DAT music soft tapes deteriorates to some extent during analog recording, it is possible to make digital copies without deteriorating the sound quality. Therefore, there was a problem in that the software industry, such as music, could be disadvantaged.

[0009] In other words, conventional recording/playback devices and recording devices such as DAT used only one bit, bit 2 of the channel status signal, to determine whether or not digital copying was possible. The problem was that analog signals could be recorded indefinitely even if the content remained the same.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a recording/reproducing apparatus and a recording apparatus including a DAT, which limits the number of generations of digital copying even for analog-recorded DAT tapes.

[0011]

[Means for Solving the Problems] In order to solve the above problems, the recording and reproducing apparatus of the present invention is a medium of a generation that updates the generation when digital copying is performed based on a copy control subcode signal recorded on the medium. or medium identification means for identifying whether the medium is of a generation that has reached a certain generation and cannot be digitally copied thereafter, and converting the generation information obtained from the medium identification means into a copy control signal and outputting it as a digital output signal. a copy control signal converting means for generating a copy control subcode signal, which is generation information to be recorded on a medium; and a recording means for converting an analog signal into a digital signal and recording it. It is.

The recording apparatus of the present invention also includes a copy control subcode signal generating means for generating a copy control subcode signal which is generation information to be recorded on a medium, and a recording means for converting an analog signal into a digital signal and recording it. It is equipped with the following.

[0013]

[Function] The present invention has the following effects due to the above-described structure.

[0014] In the recording and reproducing apparatus of claim 1, when a medium recorded by converting an analog signal into a digital signal is reproduced, the medium identifying means identifies the medium as a medium whose generation is updated when digital copying is performed. , the copy control subcode signal generating means converts the analog signal into a digital signal and records it, so that the copy control signal converting means outputs a copy control signal that limits the number of generations of subsequent digital copies. Since the copy control subcode signal having the value of is generated, the number of digital copy generations can be limited even if the first generation is an analog recorded tape.

[0015] The recording apparatus according to the second aspect of the present invention includes a copy control sub-sub so as to output a copy control signal that limits the number of generations of subsequent digital copies when a medium recorded by converting an analog signal into a digital signal is reproduced. Since the code signal generation means is configured to generate a copy control subcode signal of a predetermined value when converting an analog signal into a digital signal and recording it, the medium recorded by the recording apparatus of the present invention can be used. can limit the number of generations of digital copies when digitally copied using another recording/playback device.

Furthermore, in the recording and reproducing apparatus according to claim 1 and the recording apparatus according to claim 2, as shown in claim 3, the copy control signal for limiting the number of generations of subsequent digital copies is " Since the signal includes bit 2, which is 0'', it is impossible to digitally copy the medium recorded with the recording device of the present invention even if you attempt to digitally copy it using a conventional playback device and a conventional recording device. Therefore, the number of generations of digital copies can be limited.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a recording/reproducing apparatus and a recording apparatus of the present invention will be described in detail below with reference to the drawings, taking a DAT as an example.

FIG. 1 is a block diagram of a DAT in one embodiment of the present invention. In FIG. 1, 1 is an analog input terminal, 2 is an AD converter, 3 is a digital input terminal, 4 is a digital demodulation circuit that demodulates the digital signal input to the digital input terminal, and 5 is the output signal of the AD converter 2 or digital demodulation A selection switch 6 selects the output signal of the circuit 4, and 6 is a recording signal processing circuit that performs interleaving processing to change the temporal arrangement of the digital signal, addition of an error correction code, addition of an output signal of the subcode encoder 13 to be described later, etc. , 7 is a recording amplifier, 8 is a recording head, and 9 is a magnetic tape which is a medium according to an embodiment of the present invention. A channel status decoder 10 obtains a channel status signal shown in FIG. 4(c) from the output signal of the digital demodulation circuit 4.

[0019]

[Table 1]

For example, as shown in Table 1, bit 2 of the channel status signal is "0" and bit 14 is "0".
1", this is a discrimination unit that discriminates to prohibit digital copying, and to enable digital copying when bit 2 and bit 14 are other than the above. 12 is a channel that passes through discrimination unit 11 in the case of digital copying. From bit 2 and bit 14 of the status signal, the main ID shown in Figure 5(c)
ID6 is obtained as shown in Table 2, for example, and in the case of analog recording, ID6 is a digital copy control subcode signal generating section which becomes "00". 13 is a subcode encoder that creates a subcode including ID6.

[0021]

[Table 2]

Reference numeral 14 indicates operation switches including a recording switch, a playback switch, and an input changeover switch for switching between recording the signal input to the analog input terminal 1 and copying the signal input to the digital input terminal 3; controls the selection switch 5 according to the input changeover switch,
In the case of analog recording, this is an input setting section that controls ID6 to be "00". Reference numeral 16 denotes a recording prohibition setting section that controls the recording signal processing circuit 6 to prohibit recording according to the output signal of the determining section 11. 8 is a playback head, 17 is a playback amplifier, 18 is a playback signal processing circuit that performs error correction of the digital signal and deinterleave processing to restore the original temporal order, 19 is a DA converter, and 20 is an analog output terminal. It is. 21 is a subcode decoder that obtains signals such as the main ID, and 22 is a subcode decoder that obtains signals such as the main ID, and 22, as shown in Table 3, bits 2 and 14 of the channel status signal from ID6, which is the output signal of the subcode decoder 21.
This is a digital copy control signal converter that obtains the following.

[0023]

[Table 3]

23 is a digital copy control signal converter 22
is a channel status encoder containing an output signal of 25 is obtained from the output signal of the reproduced signal processing circuit 18, the output signal of the channel status encoder 23, etc. in FIG.
26 is a digital output terminal. 27 is the discrimination unit 1
1. A system controller that includes a digital copy control subcode signal generation section 12, an input setting section 15, a recording prohibition setting section 16, and a digital copy control signal conversion section 22, and is composed of, for example, a microcomputer.

Regarding the DAT configured as above,
The operation will be explained below using drawings and tables. FIG. 2 is a flowchart showing part of the processing of the system controller 27.

First, when digitally copying a compact disc or a DAT soft tape, input the signals shown in FIGS. When the switch is set to digital copy and the recording switch is pressed, the system controller 27, in decision step 31 of FIG.
It is determined that the recording switch is pressed, and the process proceeds to judgment step 32. In judgment step 32, it is determined that digital copy is set, and the input setting unit 15 sets the selection switch 5 to input the output signal of the digital demodulation circuit 4 to the recording signal processing circuit 6, and performs processing. Step 33 is reached. In processing step 33, the determining unit 11
inputs the output signal of the channel status decoder 10 and checks bit 2 and bit 14 of the channel status signal. When playing a compact disc or DAT soft tape, bit 2 is a signal indicating that digital copying is prohibited, that is, "0", and bit 14 is currently "0", so from Table 1, digital copying is possible. It is determined that Accordingly, the decision step 34 leads to the processing step 35. In processing step 35, the digital copy control subcode signal generator 12 generates the ID from Table 2.
A signal in which 6 becomes "10" is output to the subcode encoder 13. Then, in process step 36, system controller 27 sets the recording mode. The output signal of the subcode encoder 13 including ID6 and the output signal of the selection switch 5 are sent to a recording signal processing circuit 6 and a recording amplifier 7.
After that, the data is recorded on the magnetic tape 9 by the recording head 8. Therefore, even compact discs and DAT soft tapes can be digitally copied.

[0027] Next, the compact disc or DAT soft tape is digitally copied and played back on the DAT.
A case will be described in which an attempt is made to digitally copy a reproduced digital output signal using another DAT.

When the playback switch in the operation switch 14 of the playback side DAT is pressed, the system controller 27 recognizes that the playback switch has been pressed in a determination step 39, and transfers the signal recorded on the magnetic tape 9 to the playback head. 2
8 reproduces the audio signal, passes through a reproduction amplifier 17 and a reproduction signal processing circuit 18, and outputs the digital signal of the audio signal to the DA converter 1.
9 and the digital modulation circuit 25, and the subcode signal passes through the subcode decoder 21 and is inputted to the digital copy control signal converter 22. In processing step 40, the digital copy control signal converter 22 converts ID6 of the main ID into bits 2 and 14 of the channel status signal according to Table 3. Tape 9 I being played
Since D6 is "10", bit 2 of the channel status signal becomes "0" and bit 14 becomes "1". The output signal of the digital copy control signal converter 22 is input to the channel status encoder 23, and the channel status encoder 23 creates the signal shown in FIG. 4(c). Subsequently, in processing step 41, the digital modulation circuit 2
5 obtains the digital signals shown in FIGS. 4(a) and 4(b) from the output signals of the channel status encoder 23 and the reproduced signal processing circuit 18, and outputs them from the digital output terminal 26. When this signal is connected to the digital input terminal 3 of the recording side DAT and an attempt is made to record it, in the judgment step 34 of the system controller 27 of the recording side DAT, the determination unit
1, it is determined that digital copying is prohibited as shown in Table 1. As a result, the recording prohibition setting section 16 prohibits recording by, for example, cutting off the signal output from the recording signal processing circuit 6 to the recording amplifier 7. Therefore, compact discs and DA
It is not possible to make a digital copy using DAT from a tape recorded with T's soft tape.

Next, a case will be described in which a signal input from the analog input terminal 1 is recorded and this tape is digitally copied.

When the input changeover switch of the operation switch 14 of the recording-side DAT is set to analog recording and the recording switch is pressed, the system controller 27 determines analog recording in judgment step 32 and inputs the signal to the analog input terminal 1. A signal converted into a digital signal by the AD converter 2 is input to the selection switch 5. The input setting section 15 controls the selection switch 5 to select the output of the AD converter, and in processing step 37, the input setting section 15 causes the digital copy control subcode signal generation section 12 to select the output of the AD converter.
00''.Next, in a processing step 36, the subcode signal including ID6 and the output signal of the selection switch 5 are recorded on the magnetic tape 9.The tape recorded in this way is used as a first generation tape.

When creating a second generation tape by digitally copying a first generation tape, when the first generation tape is played back, in processing step 40 of the system controller 27 of the playback side DAT, the digital copy control signal converter 22, ID6 is "00", so from Table 3, bit 2 of the channel status signal is "1" and bit 14 is "
1". When the signal from the digital output terminal 26 including this signal is digitally copied by another DAT, in the judgment step 34 of the system controller 27 of the recording side DAT, the discrimination unit 15 determines whether the channel status signal Since bit 2 is "1" and bit 14 is "1", digital copying is possible from Table 1, and processing step 35 is reached, where the digital copy control subcode signal generation unit 12 reads ID6 from Table 2 as "01". The tape recorded in this way is called a second generation tape.

Similarly, when a third generation tape is created by digitally copying a second generation tape, when the second generation tape is played back, the digital copy control signal converter 22 of the playback side DAT converts the data as shown in Table 3. outputs a signal in which bits 2 and 14 of the channel status signal are both "0". When the signal from the digital output terminal 26 including this signal is input to the digital input terminal 3 of the recording side DAT and digitally copied, the discriminator 15 detects that the channel status signal has both bits 2 and 14 of "0". 1, digital copying becomes possible, and the digital copy control subcode signal generating unit 12 sets ID6 to be "10" from Table 2. A third tape was recorded in this way.
It will be a generational tape.

Similarly, if you try to make a fourth generation tape by digitally copying a third generation tape,
When a generation tape is played back, the digital copy control signal converter 22 of the playing side DAT outputs a signal in which bit 2 of the channel status signal becomes "0" and bit 14 becomes "1" as shown in Table 3. Digital output terminal 26 containing this signal
When attempting to input a signal from the recording side DAT to the digital input terminal 3 of the recording side DAT to perform digital copying, in judgment step 34 of the system controller 27, the determining unit 11 determines that digital copying is prohibited as shown in Table 1. As a result, the recording prohibition setting unit 16 prohibits recording by, for example, cutting off the signal output from the recording signal processing circuit 6 to the recording amplifier 7. Therefore, it is not possible to make fourth generation tapes by digital copying.

As described above, when converting an analog signal into a digital signal and recording it, a copy control subcode signal generator is used to record a copy control subcode signal of a predetermined value on a medium, and a In this case, by providing a copy control signal converter that outputs a copy control signal that limits the number of subsequent generations of digital copies, even if the medium was originally recorded by converting an analog signal into a digital signal, The number of generations of digital copies can be limited.

Furthermore, even if a conventional DAT is used to digitally copy a medium recorded by the recording/reproducing apparatus and recording apparatus of the present invention, the bits of the channel status signal which is a copy control signal in the digital output signal 2
Since this includes a signal in which "0" becomes "0", digital copying after the second generation is impossible, and the number of generations of digital copying can be limited.

In the above explanation, the 2-bit copy control signal was used as an example, but there is an undefined part in the DAT subcode signal area, and the channel status signal is also unused, as shown in FIG. 5(c). There is a department. Therefore, it is also possible to use a copy control signal with an increased number of bits depending on the number of copy generations.

[0037]

As described above, the number of subsequent digital copy generations of a medium in which an analog signal is digitally converted and recorded by the recording/reproducing apparatus or recording apparatus such as the DAT of the present invention is limited. i.e. compact disc or DAT
It will no longer be possible to make unlimited copies without deterioration through digital copying from media recorded by converting music soft tapes into analog signals. Therefore, there is less possibility that the software industry, such as music, will be disadvantaged.

[Brief explanation of the drawing]

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

[Figure 2] Flowchart showing the processing of the system controller in Figure 1

[Figure 3] Connection diagram of audio equipment centered on DAT

[
Figure 4: Format diagram showing the main parts of the signal format of the digital audio interface

[Figure 5] DAT
Format diagram showing the main parts of the recording format of

[Explanation of symbols]

3 Digital input terminal 10 Channel status decoder 11
Discrimination unit 12 Digital copy control subcode signal generation unit 13 Subcode encoder 21 Subcode decoder 22 Digital copy control signal conversion unit 23
Channel status encoder 26 Digital output terminal 27 System controller

Claims (3)

[Claims] [Claim 1] According to the copy control subcode signal recorded on the medium, the medium is of a generation that updates the generation when digital copying is performed, or the medium is of a generation that reaches a certain generation and cannot be digitally copied thereafter. a copy control signal converting means for converting the generation information obtained from the medium identification means into a copy control signal and outputting it as a digital output signal; and a copy control sub which is the generation information recorded on the medium. A copy control subcode signal generating means for generating a code signal and a recording means for converting an analog signal into a digital signal and recording the same are provided, and when a medium on which the analog signal is converted into a digital signal and recorded is played back, the medium identification The copy control subsystem is configured such that the means identifies the medium as a generation medium whose generation is updated upon digital copying, and the copy control signal converting means outputs a copy control signal that limits the number of generations of subsequent digital copies. 1. A recording and reproducing apparatus, characterized in that the code signal generating means is configured to generate a copy control subcode signal of a predetermined value when converting an analog signal into a digital signal and recording it. 2. Copy control subcode signal generation means for generating a copy control subcode signal, which is generation information to be recorded on a medium, and recording means for converting an analog signal into a digital signal and recording it, The copy control subcode signal generating means converts the analog signal into a digital signal so as to output a copy control signal that limits the number of subsequent digital copy generations when a medium recorded by converting the signal into a signal is reproduced. When recording,
A recording device characterized in that it is configured to generate a copy control subcode signal of a predetermined value. 3. The copy control signal having a predetermined value according to claim 1 or 2 is configured of two subframes in one sampling period and connects digital audio equipment. is the channel status of a digital audio interface signal consisting of 32 bits: a 4-bit synchronization amble, a 4-bit error signal, 20 bits of audio data, and 1 bit each for channel status, user data, channel status, and parity bit. The recording/reproducing apparatus according to claim 1, wherein the signal includes bit 2 which is "0" of a channel status signal consisting of bits 0 to 191, which is transmitted as one unit in 192 frames, or , The recording device according to claim 2.