JPH0289255A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To restrict the number of digital copies by providing the title device with a copy control signal deciding part, a copy control signal generating part and a copy control signal converting part for outputting a copy control signal. CONSTITUTION:The device is provided with the deciding part 11 for deciding a copy control signal consisting of plural bits included in a digital signal connected between apparatuses, the copy control signal generating part 12 for obtaining a copy control subcode signal consisting of plural bits to be recorded in a tape from the copy control signal when digital copying is available and the copy control signal converting part 22 for outputting a copy control signal having a value different from a copy control signal consisting of plural bits included in an input signal at the time of reproducing the input signal. Thereby, the copy control signal consisting of plural bits is set up to a successively different value every digital copying. Consequently, the number of digital copies can be restricted by setting up the value of copy control signal so as to inhibit digital copying when the value reaches a certain value.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording and reproducing apparatus, such as a digital audio tape recorder (hereinafter referred to as DAT), which can directly record and reproduce digital signals.

Conventional technology In recent years, standardization of interface specifications for connecting audio devices using digital signals has progressed, and CD players, satellite broadcasting tuners (hereinafter referred to as BS tuners), etc.
Products equipped with a digital output terminal in addition to an analog output terminal are commercially available. Furthermore, recording and reproducing devices such as DAT that can directly record digital signals have been put into practical use.

Hereinafter, a DAT will be described as an example of the above-mentioned recording/reproducing apparatus with reference to the drawings.

FIG. 3 is a connection diagram of conventional 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 DAT recording format.

In FIG. 3, 61 is a BS tuner, 61A,
61D is an analog output terminal and a digital output terminal of the BS tuner 61. 62 is a CD player, 62A
, 62D are analog output terminals and output terminals of the CD player. 63 is DAT, 63A, 63D are DAT
These are the es analog output terminal and digital output terminal. 6
4 is an analog audio device such as an FM chainer or an analog record player, and 64A is an analog output terminal of the analog audio device 64.

65.66 are DAT, 66B, ee
B is DATee5. DATee analog input terminal, e
sc and sec are DAT65. Digital input terminal of DATe16, esA, 5eAFiDAT65.

DATee analog output terminal, 65D, eeD is D
AT65 is the digital output terminal of DATee. Digital output terminals 61D and 62D for each device.

Signals are exchanged from 63D and eesD to the digital input terminal 615C of DATes and the digital input terminal of DATee in a format defined as shown in FIG. As shown in Figure 4(a), two channels of the left and right channels are sampled at the time of sampling the analog signal.
consists of subframes. Each subframe is the fourth
As shown in the figure, it consists of 32 bits and is configured to transfer 20 bits of audio data after a 4-bit synchronization signal and 4-bits of preliminary data. As shown in Figure 4 (C), the channel status is configured so that 192 bits have meaning as one block.The six bits from the channel status 00 bit to bit 6 are control bits and have different uses. , indicates whether digital copy is possible, etc. In other words, if two bits of the channel status of the signal input to the digital input terminal 660 are @0'', D
ATes cannot record digitally. (For example, refer to "Electronics Life Vol. SSS Issue No. 1s to 19 pages.") 4. The sampling frequencies of DAT recordings are 481 and 3.
2k)h only, the sampling frequency signal 11 is for the recorded tape, that is, for reproduction only. Therefore, when playing back a music source, the signal from the digital output terminal 62D of the CD player 62 has two channel status bits of "O" and a sampling frequency of 44.
1k)h, DATee cannot record.

Also, DAT63. DATees and DATee tapes have the recording format shown in Figure 5, with PCM data that encodes audio signals and a main ID for playing back the PCM data recorded in the PCM area at the center of the tape. . The PCM area shown in FIG. 6(a) consists of 128 blocks, and one block consists of 288 bits as shown in FIG.
As shown in C), format the ID by one block,
ID1 to ID6. It is repeatedly recorded up to ID7.

As shown in FIG. 6(d), when the 2 bits of the format ID are @00'', that is, when the DAT is an audio recorder, digital copying is possible when the 2 bits of the IDe are ``co''. 10”, digital copying is prohibited. That is.

A tape recorded by a DAT user has an IDe of @00'' and can be digitally copied, but in the case of a soft tape such as a music source, if @10'' is recorded in the IDe, digital copying is not possible.

However, recording from the analog output terminal 62A of the CD player 62 to the analog input terminal esB of DATes,
Recording from the analog output terminal 63A of the AT83 to the analog input terminal asB of the DATes becomes possible, and analog copying of compact discs and DAT soft tapes is possible even though digital copying is prohibited. However, in this case, C1) Since the DA conversion circuit of the player 62 or the DA conversion circuit of the DAT 63 and the AD conversion circuit of the DAT 85 are included, there may be some deterioration in sound quality compared to a digital copy. Furthermore, -degree analog recorded tapes are
Since IDe shown in FIG. 6(d) becomes @oo #,
After that, unlimited digital copies will be possible.

Problems to be Solved by the Invention As explained above, although conventional DAT allows the freedom of recording for personal enjoyment, compact discs and DAT music soft tapes do not contain digital signals. Since there is a code prohibiting digital copying in the DAT, it is not possible to directly record all digital signals, and DAT users are forced to record with analog signals, which degrade the sound quality to some extent. Therefore, a DA that records digital signals
The problem was that it was not possible to take full advantage of T's strengths.

On the other hand, a DAT tape recorded with a -degree analog signal is
Since the main ID IDe is recorded as @oo', unlimited digital copying is possible from then on.Although the sound quality of compact discs and DAT music soft tapes deteriorates somewhat when recording in analog, the sound quality can be improved by digital copying from now on. It is possible to make a replica without deterioration. Therefore, there was a problem in that it brought a very large disadvantage to the software industry such as music.

In view of the above problems, the present invention has been developed to
A DAT music tape can be digitally copied to a DAT for a limited number of times, and digital cohesion is prohibited from the copied DAT tape.
The purpose of the present invention is to provide a recording and reproducing device including a DAT that limits the number of times that digital copying can be performed even on a DAT tape recorded in an analog manner.

Means for Solving the Problems In order to solve the above problems, the recording and reproducing apparatus of the present invention includes a discrimination section that discriminates a 2-bit copy control signal included in a digital signal that connects devices, and a discriminator that is capable of digital copying. 2 to be recorded on tape from the copy control signal.
A copy control signal generator that obtains a bit copy control subcode signal, and a copy control signal generator that obtains a bit copy control subcode signal, and a
A copy control signal converting section is provided for outputting a copy control signal having a value different from the bit copy fIli++ control signal.

Function: With the above-described configuration, the 2-bit copy control signal of the present invention sequentially changes to a specific value each time digital copying is performed, so if it is set to prohibit digital copying when a certain value is reached, , the number of digital coffees can be limited. When a compact disc or a DAT music soft tape is played, the determination unit determines that the output copy control signal is copyable, and the determination unit determines that the copied and output copy control signal is prohibited. Under the control of the system controller, digital copying of compact discs and DAT soft tapes 4 can be performed by limiting the number of copies.

EXAMPLE Hereinafter, an example of the present invention will be described using a DAT as an example with reference to the drawings.

1 is an analog input terminal, 2 is an AD converter, 3 is a digital input pusher, 4 is a digital TV F subcircuit that demodulates the digital signal input to the digital input terminal 3, and 6 is an AD converter.
A selection switch 6 selects between the output signal of the converter 2 and the output signal of the digital/L/demodulation circuit 4; 6 is an increment process for changing the temporal order of the digital signal; addition of an error correction code; and a subcode encoder 13 to be described later. 7 is a recording amplifier, 8 is a recording head, and 9 is a magnetic tape. 10 is the output signal of the digital demodulation circuit shown in FIG. 4(C), ? , /L/ The channel status decoder 11 that obtains the status prohibits digital recording when pit 2 of the channel status is "0#" and pit 14 is "11", as shown in Table 1, and pit 2 and pit 14 are In cases other than the above, the determination unit determines whether digital recording is possible.

Table 1 - Functions of the discriminator 11 Table 2 The functions 12 of the digital copy control signal generator 12 are determined from bits 2 and 14 of the channel status that has passed through the discriminator 11 in the case of digital recording, as shown in Figure 6(c). The main ID ID6 shown in is obtained, for example, as shown in Table 2,
In the case of analog recording, IDe is a digital copy gain signal generator that becomes @oo''. 13 is a subcode encoder that creates a subcode including IDe. 14 is a recording switch, a playback switch, and an analog input terminal. 1
An operation switch 16 includes an input selector switch for selecting whether to record a signal input to the digital input terminal 3 or a signal input to the digital input terminal 3; I if
16 is an input setting unit that controls D6 so that it becomes @oo''. 16 is an input setting unit that controls D6 so that
This is a recording prohibition setting unit that controls the recording signal processing circuit 6 to prohibit recording by the symbol processing circuit and others when 4 is @1''.

28 is a playback head, 1T is a playback amplifier, 18 is a playback signal processing circuit that performs error correction of digital signals and de-interleaving processing to restore the original temporal arrangement, etc., 19 is a DA converter, and 2o is an analog output. It is a terminal. 21
is a subcode decoder that obtains signals such as main ID, 22
is a digital copy control signal conversion unit that converts bits 2 and 14 of the channel status from IDs, which is the output of the subcode decoder 21. 23 is a channel status encoder that includes an output signal of the digital copy control signal converter 22.

26 is the output signal of the reproduced signal processing circuit 18, the output signal of the channel status encoder 23, etc. as shown in FIG. 4(a).
, 2e is a digital output terminal.

27 is a determination unit 11 and a digital copy control signal generation unit 12
, an input setting section 16, a recording prohibition setting section 16, and a digital copy control signal converting section 22. The system controller is composed of, for example, an Eva microcomputer.

The operation of the DAT configured as described above 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 recording a compact disc or DAT soft tape, the digital input terminal 3 is
When the signals shown in a) and (b) are input, the input selector switch of the operation switch 14 is set to digital/L/audio, and the recording switch is pressed, the system controller 27 performs the judgment step shown in FIG. At step 31, it is determined that the recording switch is pressed, and the process proceeds to decision step 32.

In the judgment step 32, it is determined that digital recording is set, and the input setting section 16 switches the selection switch 6.
Record the output signal of the digital demodulation circuit 4 to the signal processing circuit 6
is set so as to be input, and the process proceeds to step 33. 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. When playing a compact disc or DAT soft tape, bit 2 is a digital copy prohibition signal, that is, 10”.
Since bit 14 is currently undefined and is @0'', it is determined from Table 1 that digital recording is possible.Therefore, judgment step 34 leads to processing step 36.In processing step 36, it is determined that digital recording is possible. , the digital copy control signal generator 12 outputs a signal whose IDe is "10" from Table 2 to the subcode encoder 13. Then, in processing step 3e, the system controller 27 sets the recording mode. The output signal of the code encoder 13 and the output signal of the selection switch 6 are recorded on a magnetic tape 9 by a recording head 8 via a recording signal processing circuit 6 and a recording amplifier 7. It is also possible to make digital copies.

Next, a case will be described in which an attempt is made to reproduce a tape obtained by digitally copying a compact disc or a DAT soft tape using a DAT, and to digitally copy the reproduced digital output signal using another DAT.

When the playback switch in the playback switch 14 is pressed, the system controller 27 [4J separate step 7'' 39 acknowledges that the playback switch has been pressed, and the playback head 28 outputs the signal recorded on the magnetic tape 9. The digital signal of the audio signal is transmitted through a reproduction amplifier 17 and a reproduction signal processing circuit 18 to a DA converter 19 and a digital modulation circuit 2.
6, and the subcode signal is input to the subcode decoder 21.
is input into the digital copy control signal converter 22.

In processing step 4o, the digital copy control signal converter 22 converts main ID ID6 to channel status bits 2 and 14 according to Table 3.

Table 3 Functions of Digital Copy Control Signal Conversion Section 22 The IDe of the tape 9 being reproduced is '10' (blank), the channel status bit 2 is 'O', and the bit 14 is '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 obtains the signal shown in FIG. 4(C).

Subsequently, in processing step 41, the digital modulation circuit 2
5 is the output signal of the channel status encoder 23 and the reproduced signal processing circuit 18 as shown in FIG. 4(a).

Obtain the digital signal shown in fb) and send it to digital output terminal 2.
Output from 6. If you try to record by connecting this signal to the digital input terminal 3 of another DAT, judgment step 3
In step 4, the determining unit 11 determines that digital recording 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, it is not possible to record on a compact disc or a tape recorded with a DAT soft tape.

Next, divide the signal input from analog input terminal 1,
The case where this tape is digitally copied will be explained.

When the input changeover switch of the operation switch 14 is set to analog recording and the recording switch is pressed, analog recording is determined in judgment step 32, and the signal input to the analog input terminal 1 and converted to a digital signal by the AD converter 2 is selected. input to the switch. Input setting section 15
controls the selection switch 5 to select the output of the AD converter, and in processing step 37 outputs a control signal to the digital copy control signal generation unit 12 so that IDe becomes @oo''.Next, processing step 36, the subcode signal including IDe and the output signal of the selection switch 5 are recorded on the magnetic tape 9.The tape recorded in this way is a first generation tape.The first generation tape is digitally copied and the output signal of the selection switch 5 is recorded on the magnetic tape 9. In order to create a second generation tape, when the first generation tape is played back, in processing step 4o,
The digital copy control signal converter 22 is configured so that IDes @O
o'', therefore, from Table 3, a signal is output in which bit 2 of the channel status becomes 1'' and bit 14 becomes 1''.

When the signal from the digital output motherboard 26 including this signal is digitally recorded by another DAT, in the judgment step 34, the judgment unit 15 determines that bit 2 of the channel status is l'1.
", since bit 14 is 1", digital recording is possible from Table 1, and processing step 3S is reached, where the digital copy control signal generator 12 reads IDs from Table 2 as "o1".
Set it so that The tape recorded in this way is referred to as a second generation tape.

Similarly, when creating a third generation tape by digitally copying a second generation tape, when the second generation tape is played back,
The digital copy control signal converter 22 outputs a signal in which bit 2 and bit 14 of the channel status are both 10'' from Table 3.

When a signal from the digital output terminal 26 including this signal is input to the digital input terminal 3 of another DAT and digitally recorded, the discriminating unit 16 judges that the channel status bit 2 and bit 14 are both @011, so it is displayed in Table 1. Digital recording is possible from the digital copy control signal generator 1.
2 is set so that ID6 is "10" from Table 2. The tape recorded in this way is referred to as a third generation tape.

Similarly, when attempting to make a fourth generation tape by digitally copying a third generation tape, when the third generation tape is played back, the digital copy control signal converter 22 converts bit 2 of the channel status from Table 3. is 10”, bit 1
4 becomes 1". When attempting to input a signal from the digital output terminal 26 including this signal to the digital input terminal 3 of another DAT for digital recording, in a judgment step 34, the discrimination unit 11 As shown in Table 1, it is determined that digital/L/recording is prohibited.The 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, 4th generation tape cannot be created by digital copying.

As described above, the determination unit determines whether digital recording is possible from the 2-bit channel status signal, which is a copy control signal included in the digital signal that connects the DATs, and the determination unit determines whether digital recording is possible or not from the copy control signal. I of the main ID, which is a 2-bit copy control subcode signal to be recorded.
A copy control signal generating section for obtaining De, and a copy control signal converting section for outputting a copy control signal having a value different from the 2-bit copy control signal contained in the input signal from the value of the reproduced IDe during reproduction. As a result, each time a digital copy is made, the value becomes different, so if a setting is made to prohibit digital copying when a certain value is reached, the number of digital copies can be controlled.

Furthermore, since digital copying is determined using two bits, the number of copies is limited and digital Copying may be possible.

Furthermore, as in the second embodiment, if one bit of the two-bit copy control signal corresponds to bit 2 of the channel status, which is the conventional copy system '1141 signal, No need to change audio equipment.

Effects of the Invention As described above, the present invention includes a discriminator that determines a 2-bit copy control signal indicating whether or not digital copying is possible, which is included in a digital signal that is interconnected between devices, and a 2-bit copy control signal that is recorded on a tape from the copy control signal. A copy control signal generating unit that obtains a copy city +14 wholesale subcode signal, and a copy control unit that outputs copy fn control information having a value different from the 2-pinto copy control signal included in the input signal during playback. By providing a copy control signal converter that outputs a signal, the number of digital copies can be limited. Therefore, there will be no disadvantage to the music and other software industries.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of D/1T according to an embodiment of the present invention, FIG. 2 is a flowchart showing part of the processing of the system controller in FIG. 1, and FIG. 3 is a function of the determination unit 11 in FIG. 1. Figure 4 shows the digital copy control signal generation section 1 in Figure 1.
20 functional diagram, FIG. 6 is a functional diagram of the digital copy control signal converter 220 in FIG. A format diagram showing the main part of the signal format of the interface. Figure 6 is a format diagram showing the main part of the DAT recording format. 3...Digital input terminal, 10...Channel status decoder, 11...Discrimination unit, 12
・・・・・・Digital copy shop 7/Month 1 Signal generation part, 1
3.Middle...Subcode encoder, 21...-Subcode decoder, 22...Digital copy control signal converter, 23...Channel status encoder, 26...River... Digital output Nobuko, 27...Yama system controller. Name of agent Patent attorney Toshio Nakao and 1 other person Figure 5 Figure 0 Civil procedure amendment document March 1988 Agent Address: Patent Application Person: 1006 Kadoma, Kadoma City, Osaka Prefecture (582) Matsushita Electric Industrial Co., Ltd. Akio Tanii 1006 Kadoma, Kadoma City, Osaka Prefecture 571 Matsushita Electric Industrial Co., Ltd. Detailed description of the invention (Sono Specification 1!
1C of Drawings in G] Simple Explanation Column 8, Contents of Amendment (1) The scope of claims in the specification will be amended as shown in the attached sheet. (2) “0 bit to 6 bit” on page 4, line 7
Correct it to "from bit 0 to pit 6". (3) “2 focus” on page 4, lines 11 and 20
is corrected as "bit 2". (4) The following corrections have been made to page 4, lines 16 to 18. [In the case of copyrighted compact discs, a signal indicating that digital copying is prohibited is generally recorded on the compact disc, and when this compact disc is played, pit 2 of the channel status changes to 1.]
0" is output from the digital output terminal. Therefore, when playing a compact disc on which such a music source is recorded, the signal becomes "CD playback" (6), page 6, line 1~
Correct the second line as follows. "DAT65 cannot record because of this." (6) The 700th line, line 16 of the same is amended as follows. ``In other words, because conventional recording and playback devices only discriminated digital copies based on bit 2 of the channel status, compact discs and DAT music soft tapes could never be recorded using digital signals.
Recording using analog signals has the problem that even if the content remains the same, it can be recorded indefinitely. In view of the above problems, the present invention corrects "2 bits" in Compact Disco (7), page 8, lines 7, 9, 11, and 16 to "multiple bits." (8) "2" on page 21, lines 16, 17, and 19.
Correct "bit" to "multiple bits". (9) The following amendment has been made to page 21, line 12. [There is no need to change the digital audio equipment. The above explanation took the 2-bit copy control signal as an example, but there is an undefined part in the DAT subcode signal area.
As shown in FIG. 6C, there is also an unused portion of the channel status. Therefore, it is also possible to use a copy control signal whose focus number is increased depending on the number of copies or the like. ” (1
0) "Figure 3 - Functional diagram," on page 22, lines 8 to 12,
” will be deleted. 2. Claims 14 of a digital copy of a digital signal that connects devices
A determination unit that completely determines whether or not digital copying of an input signal is possible based on a copy control signal consisting of multiple bits indicating whether digital copying is possible; A copy control signal generation unit that obtains a copy control subcode signal consisting of multiple bits indicating whether copying is possible, and when reproducing and outputting a recorded signal, outputs a copy control signal with a value different from the copy control signal of the input signal. What is claimed is: 1. A recording and reproducing device comprising a copy control signal converting section to limit the number of digital copies.

Claims (1)

[Claims] a determination unit that determines whether or not an input signal can be digitally copied based on a copy control signal consisting of 2 bits that indicates whether or not a digital signal that is connected between devices can be digitally copied; , the reproduced output signal indicates whether digital copy is possible2
A copy control signal generating section that obtains a copy control subcode signal consisting of bits, and a copy control signal generator that outputs a copy control signal with a value different from the copy control signal of the input signal when reproducing and outputting the recorded signal. Equipped with a conversion section,
A recording and reproducing device characterized in that the number of digital copies is limited.