JPS63221780A - Signal processor and recording medium - Google Patents

Abstract

PURPOSE:To record recording information subjected to scramble processing onto a recording medium without applying any special processing to an input signal itself by converting an input signal into a digital data so as to apply scramble processing and recording the result onto the recording medium. CONSTITUTION:An input video signal SVD1 is fed to a Y/C separation circuit 3 via an input amplifier circuit 2. A luminance signal SY1 and a chrominance signal SC1 subjected to Y/C separation are converted into digital data by A/D conversion circuits 6, 13 and stored once in memories 7, 14. On the other hand, a scramble control section 21 outputs read control signals CON3, CON4 reading sequentially the luminance signal and the chrominance signal in a prescribed timing based on the timing signal supplied from the timing generating circuit 20 and when a scramble signal SSC is inputted externally, the scramble processing is applied based on the scramble code stored in a built-in ROM to read it out of the memories 7, 14.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A: Industrial field of application B: Outline of the invention C: Conventional technology: Problems to be solved by the invention E: Means for solving the problem (Figs. 1 to 5) F Effects (Figs. 1 to 5) Figure) Example G (G1) Recording of video signals (Figures 1 and 3) (G2
) Video signal reproduction (Figures 2 and 3) (G3) Effects of the embodiment (Figures 1 to 5) (G4) Other embodiments (Figure 3)
5) 1) Effects of the Invention A Field of Industrial Application The present invention relates to a signal processing device and a recording medium, and can be applied to, for example, a video tape recorder (VTR).

B. Summary of the Invention The present invention is a signal processing device having a digital memory that converts an input signal into digital data, performs scrambling processing, and records the scrambled data on a recording medium, thereby creating a recording medium having scrambled recorded information. Gain,
Furthermore, a reproduced signal can be obtained by reproducing the scrambled recording medium in a predetermined format, converting it into digital data, and performing a descrambling process corresponding to the scrambling process.

C. Prior Art With the spread of conventional video tape recorders (VTRs), video tapes (hereinafter referred to as soft tapes) on which instructional textbooks for golf, tennis, etc., and copyright information of movies, etc., are recorded.
are on sale.

The production of such soft tapes requires a large amount of costs such as filming, editing, and copyright fees. However, soft tapes can be easily dubbed and created using two VTRs, and for this reason, for example, someone outside the official sales channels can make unauthorized copies and sell them as pirated soft tapes. As a result, the interests of producers and copyright holders are being hindered.

For this reason, for example, as disclosed in Japanese Patent Application Laid-Open No. 53-89715, when producing a soft tape, a part of the vertical synchronizing pulse of the luminance signal is integrated at a level different from the integral value of this vertical synchronizing pulse. In addition to replacing the soft tape with a pseudo vertical synchronization pulse consisting of a value, by inserting and recording an AGC disturbance pulse in the luminance signal, it is possible to prevent dubbing of the soft tape, thereby preventing the production of pirated soft tapes. A luminance signal transmission method has been proposed.

D Problems to be Solved by the Invention However, according to the method described above, special processing is applied to the luminance signal, so even at sales agents through regular sales channels, soft tape is sold by dubbing rather than mask tape. If it becomes necessary to manufacture a soft tape, the manufacturing cost and efficiency are insufficient, and there is also a risk that the image quality will deteriorate when users who have legitimately purchased the soft tape play it back on a VTR. The problem was unavoidable.

Furthermore, in recent years, devices have been used that can easily repair special processing of such luminance signals, and as a result, as an effective method for preventing pirated soft tapes,
It was still insufficient.

The present invention has been made in consideration of the above points, and includes a signal processing device capable of recording and/or reproducing that can solve the problems of conventional signal processing devices at once, and a signal processing device capable of recording and/or reproducing data using the signal processing device. The purpose of this paper is to propose a soft tape that can be reproduced only by the signal processing device.

E Means for Solving the Problem In the first invention, in order to solve the problem, the analog input signal 5VDI% Sal is converted into digital data, written in the digital memory 7.14.65, and scrambled in a predetermined manner. The scrambling process P1 is performed based on the code, the data is read out, and the data is recorded on a recording medium as recorded information in a predetermined format.

Further, in the second invention, the recorded information that has been scrambled and recorded on the recording medium is reproduced, converted to digital data, and written in the digital memory 36.44.85, and based on the descrambling code corresponding to the scrambled code. Perform descrambling processing P2 and read out,
Reproduction signal SvI, 1, S□ consisting of an analog signal. .

Furthermore, in the third invention, the video signal Svo+ and/or the audio signal SAD has recorded information recorded by performing scrambling processing P1 based on a predetermined scrambling code, By performing descrambling processing P2 and playing, the original information 5VD3.5PI
I tried to get IAD.

F action analog input signal Svo+ % SAD is converted into digital data, written in digital memory 7.14.65, subjected to scrambling processing P1 based on a predetermined scramble code, read out, and written to a recording medium as recorded information in a predetermined format. By recording, a recording medium having scrambled recorded information can be obtained without performing any special processing on the contents of the input signal 5vo1% SAD.

It also reproduces the scrambled recorded information recorded on the recording medium, converts it into digital data, writes it on the digital memory 36.44.85, and performs the descrambling process P2 based on the descramble code corresponding to the scramble code. and read out the analog signal 5VO1
S□. By converting the scrambled information into the scrambled information, it is possible to play back a recording medium having scrambled recorded information.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

(G1) Video Signal Recording In FIG. 1, 1 is an embodiment in which the signal processing device according to the present invention is applied to a video signal recording device of a VTR, for example, based on the β method, and the input video signal Sv
I, I is once converted into digital data, and the order of the digital data is rearranged according to a predetermined procedure (hereinafter referred to as scrambling processing), and then converted again to an output signal of 5VDt, which is an analog signal, and this is transferred to a video tape. It is recorded above.

That is, the input video signal 5VDI is supplied to the Y/C separation circuit 3 via the input amplifier circuit 2. As a result, the luminance signal S□ of the 5VDI video signal is input to the analog/digital conversion circuit 6 via the pre-emphasis circuit 4 and the clamp circuit 5, and the digital data obtained from the output terminal is converted into, for example, one screen worth of data (i.e. one
The luminance signals for one frame are written into the memory 7 having a memory capacity capable of storing the luminance signals for one frame.

In this embodiment, based on the vertical synchronizing signal included in the video signal Sv□ obtained at the output terminal of the input amplifier circuit 2, the vertical synchronizing signal forming circuit 18 generates a vertical synchronizing signal V
! VNC is formed and supplied to the timing generation circuit 20, and the subcarrier frequency signal formation circuit 19.
A subcarrier signal rie is supplied to the timing generation circuit 20 based on the reproduced burst signal.

In this way, the timing generation circuit 20 provides the sampling signal S1 and the write control signal C0N1 to the analog/digital conversion circuit 6 and the write circuit of the memory 7, thereby generating IS! in the V direction and the H direction. The luminance signal S□ is converted into digital data at the sampling period of the quasi-screen, for example, l
Data is sequentially written into the memory 7 every horizontal synchronization period.

The digital data of the luminance signal sy+ written in the memory 7 is given to the reading circuit of the memory 7 from the scramble control section 21 configured with a microcomputer. 1
) signal C0N3.

Here, the scrambling control unit 21 not only provides the readout circuit of the memory 7 with a successive control signal C0N3 for sequentially reading out the digital data of the luminance signal SvI at a predetermined timing based on the timing signal S3 supplied from the timing generation circuit 20. When the scramble signal SSC is input from an external device, for example, a mode controller (not shown), the luminance signal SV sequentially written in the memory 7 is input as shown in step P1 in FIG. 3(A), for example.
Digital data DA1 for each horizontal opening period of +
DA2, DA3, DA4, DA5, DA6, DA7, D
The order based on the scramble code stored in the built-in glue-only memory (ROM) etc. (for example, as shown in FIG. 3(B), the digital data DAI, DA4,
DA2, DA6, DA8, DA3, DA5, DA7) is scrambled and read out.
0N3 is applied to the readout circuit of the memory 7.

In this way, the digital data of the luminance signal read out from the memory 7 or the digital data after the scramble processing is transferred to the digital/analog conversion circuit 8 to which a predetermined sampling signal S4 is supplied from the timing generation circuit 20.
After being converted into an analog signal by the FM modulation circuit 9
The signal is subjected to FM modulation via the bypass filter 10, and is converted into a recording luminance signal SVt, which is then supplied to the adder circuit 1).

Chroma signal SCI separated by Y/C separation circuit 3
is applied to the analog/digital conversion circuit 13 via the frequency conversion circuit 12, converted into digital data, and then written into the memory 14.

Thus, under the control of the timing generation circuit 20, the memory 7
The digital data of the chroma signal SCI written in synchronization with the luminance signal is read out in synchronization with the luminance signal under the control of the scramble control unit 21, or is similarly scrambled in synchronization with the luminance signal. , after being converted into an analog signal in the digital/analog conversion circuit 15, the recording chroma signal SC is passed through a low-pass filter 16.
It is supplied as Z to the adder circuit 1).

The adder circuit 1) combines the recording chroma signal SCZ with the recording luminance signal SVZ, and then sends it to a magnetic head (not shown) through the output amplification circuit 17. When scrambling processing is designated by this, an arbitrary scrambling signal is generated. The code-scrambled video signal 5voz can be recorded on the magnetic tape, or the video signal Sv0 can be recorded directly on the magnetic tape.

According to the above configuration, the input video signal Sv□ is once converted into digital data and written into the memory 7.14, and then the memory 7.14 is read out based on an arbitrary scramble code, and this is converted into analog data. By converting the data into data and recording it in a predetermined format, it is possible to realize a signal processing device that obtains a scrambled soft tape with a simple configuration and without deteriorating the video signal.

(G2) Video Signal Reproduction In FIG. 2, numeral 30 is an embodiment in which the signal processing device according to the present invention is applied to a video signal reproducing device for a VTR, for example, based on the β method. The playback signal Spa obtained by reading out a soft tape on which a video signal has been scrambled and recorded via a magnetic head (not shown) as described above in the figure is once converted into digital data, and the scramble processing PL is After rearranging the order of the digital data according to the reverse processing procedure (hereinafter referred to as descrambling processing), the digital data is converted back to the original video signal Sv□, which is an analog signal, and output to, for example, a monitor. There is.

That is, the recorded information of the soft tape, which has been scrambled and recorded by the video signal recording device 1 shown in FIG. 1, is read out as the reproduced signal S□ through the magnetic head. S□
. is a bypass filter 32 via an input amplifier circuit 31,
The digital data is input to the analog/digital conversion circuit 35 through the limiter 33 and the F Mfii1) circuit 34, and the digital data obtained at the output terminal is converted into the digital data of the reproduced brightness signal SV+O for one screen (that is, one frame). The data is written to a memory 36 having a memory capacity such that the data can be stored.

In the case of this embodiment, the vertical synchronization signal V5VNe is formed in the vertical synchronization signal forming circuit 48 based on the vertical synchronization signal included in the reproduced signal 5PII obtained at the output terminal of the manual amplification circuit 31, and the timing is generated. At the same time, a subcarrier signal rsc is formed based on the reproduced burst signal in a subcarrier frequency signal forming circuit 49 and is supplied to a timing generating circuit 50 .

Thus, the timing generation circuit 50 sequentially reproduces the reproduced luminance signal S at the same timing as when recording by applying the sampling signal 5IO1 write control signal C0NIO to the analog/digital conversion circuit 35 and the write circuit of the memory 36.
The V2O digital data is written into the memory 36.

The digital data of the reproduced luminance signal SVI@ written in the memory 36 is read out by the successive control signal C0Nl2 applied to the reading circuit of the memory 36 from the descrambling control section 51 configured as a microcomputer.

Here, the descrambling control unit 51 supplies the readout circuit of the memory 36 with a successive control signal C0Nl2 for sequentially reading out the digital data of the reproduced luminance signal at a predetermined timing based on the timing signal S12 supplied from the timing generation circuit 50. In addition, when a descramble signal S□ is input from an external device, for example, a mode controller (not shown), the digital data DAI, DA4, DA2 are input as shown in step P2 in FIG. 3(B).
, DA6, DA8, DA3, DA5, and DA7 are stored in the memory 36 in the order of scrambled reproduced luminance signals S□. is subjected to descrambling processing based on the descrambling code stored in the built-in ROM etc. to create digital data DAI, as shown in FIG. 3(C).
A continuation control signal C0Nl2 for reading out DA2, . . . , DA7, and DA8 in order is applied to the continuation circuit of the memory 36.

The reproduced luminance signal read out from the memory 36 and subjected to descrambling processing is converted into an analog signal by the digital/analog conversion circuit 37 to which a predetermined sampling signal 313 is supplied from the timing generation circuit 50, and then sent to the de-emphasis circuit 38. , low pass filter 3
9 to the adder circuit 40 as the reproduced luminance signal SV++.
supplied to

Also, of the reproduced signal S0, the reproduced chroma signal 5CIII that has passed through the low-pass filter 41 is transmitted to the frequency conversion circuit 42.
The signal is applied to the analog/digital conversion circuit 43 via the analog/digital conversion circuit 43, where it is converted into digital data and then written into the memory 44.

Thus, under the control of the timing generation circuit 50, the memory 4
4 reproduced luminance signal S□. The reproduced chroma signal SC1(+ digital data written in synchronization with the reproduced chroma signal S C1 After being scrambled and converted into an analog signal in the digital/analog conversion circuit 45, the bypass filter 4
6 to adder circuit 4 as reproduced chroma signal 5ctt.
After being combined with the reproduced luminance signal Sll at 0, it is outputted to, for example, a monitor television (not shown) through the output amplification circuit 47. Accordingly, when playing back a scrambled soft tape, by using a ROM that stores a descrambling code corresponding to the scrambling code, the soft tape can be descrambled and played back properly.

According to the above configuration, when playing back a soft tape that has been scrambled by the video signal recording device 1 shown in FIG. memory 36 based on the descrambling code corresponding to the code.
44 and converting it into analog data, it is possible to realize a signal processing device that can reproduce scrambled soft tapes with a simple configuration and without deteriorating the video signal.

(G3) Effects of the embodiment As mentioned above, according to the configuration shown in FIG.
Convert I to digital data and write memo I77.14
The digital data stored in the memory 7.14 is read out in an order corresponding to an arbitrary scramble code, for example, every horizontal opening period, converted to analog data again, and recorded on the magnetic tape. By doing so, it is possible to easily and without deteriorating the signal content itself (
, it is possible to realize a signal processing device that obtains a soft tape in which a video signal is scrambled.

Further, according to the configuration shown in FIG. 2, the reproduced signal S□ of the magnetic tape on which the scrambled video signal is recorded is once converted into digital data, written to the memory 36.44, and stored in the memory 36.44. For example, digital data is read every one horizontal synchronization period in an order based on a descrambling code that corresponds to the scrambling code during scrambling processing, and is converted back to analog data to obtain a reproduced video signal. It is possible to realize a signal processing device that can easily reproduce a processed soft tape without deteriorating the signal content itself.

Thus, the soft tape created using the video signal recording device 1 shown in FIG.
For example, a soft tape created by a soft tape producer using the video signal recording device 1 shown in FIG. For example, if a person on the official sales channel uses the correct descrambling code on the video signal playback device shown in Figure 2, it cannot be played back, thus preventing the appearance of pirated soft tapes in the middle of the soft tape sales route. It is possible to obtain a soft tape that can prevent

(G4) Other Embodiments (1) FIG. 4 shows an embodiment in which the signal processing device according to the present invention is applied to an audio signal recording system 60 of an eight-fin VTR.

In other words, the PCM audio signal SaO of the 81■VTR
is quantized as 10-bit digital data via a noise reduction circuit 61 and an analog/digital conversion circuit 62, converted to 8 bits by a 10/8 conversion circuit 63, and then written into the memory 65 by an interleave circuit 64. After performing predetermined interleaving processing to add correction and detection codes to the contents of the memory 65, the FM modulation circuit 66 biphase modulates the video signal and the video signal obtained through the video signal processing system 69 and the switch circuit 67. is supplied to the A head HA and B head HB drive signal S at a predetermined timing.
IIEI:A and S Bc, *, and are recorded on a magnetic tape 71 by a magnetic head section 70.

Furthermore, in addition to the configuration of the conventional 8m VTR described above, a scrambler 1) 1m section 68 including a ROM storing an arbitrary scramble code is provided, so that when a scramble signal SSC is input, an interleave circuit is added to the digital data. After predetermined interleaving processing is performed in step 64, scrambling processing is performed based on a predetermined scrambling code in the same manner as shown in step Pi in FIGS. 3(A) and 3(B).

According to the configuration of FIG. 4, the input audio signal SA
After D is converted into digital data and written into the memory 65, it is scrambled based on an arbitrary scrambling code and recorded in a predetermined format, thereby making it possible to scramble the audio signal without deteriorating it. A signal processing device that obtains processed soft tape can be realized.

Incidentally, in the above-described embodiment, since the conventional circuit configuration is mostly used, the configuration can be made even simpler.

(2) FIG. 5 also shows a signal processing device according to the present invention.
- An embodiment applied to an audio signal reproduction system 80 of a VTR is shown, and in the same way as in the case of FIG.
A descrambling control section 89 including a ROM storing a descrambling code corresponding to the scrambling code of the scrambling control section 68 in FIG. 4 is provided for the interboration circuit 84 of the audio signal reproduction system of the VTR. Therefore, when reproducing a scrambled soft tape, descrambling processing is performed immediately before predetermined interboration processing for error detection and error correction.

According to the configuration shown in FIG. 5, the 8fi VTR of the embodiment shown in FIG.
When the scrambled soft tape is played back by the audio signal recording system 60, the memory is used to perform the descrambling process, thereby producing a signal that can play back the scrambled soft tape without deteriorating the audio signal. A processing device can be realized.

Incidentally, in the above-described embodiment as well, since most of the conventional circuit configuration is used as in the case of FIG. 4, the configuration can be made even more complicated.

(3) In the above-mentioned embodiment, the present invention is
Although applied to a capacity type VTR, the present invention is not limited to this.
For example, digital audio recorder (DAT)
It can be widely applied to other signal processing devices and soft tapes.

(4) In the above-described embodiments, the present invention is applied to a signal processing device and a recording medium using magnetic tape, but the present invention is not limited to this. It can also be applied to recorded items.

H Effects of the Invention As described above, according to the present invention, an analog input signal is converted into digital data and written into a digital memory.
By performing scrambling processing based on a predetermined scrambling code, reading it out, and recording it on a recording medium in a predetermined format, a recording medium having scrambled recorded information is obtained without performing any special processing on the input signal itself. be able to.

Further, the content of the recording medium having scrambled recorded information is reproduced in a predetermined format, written as digital data on a digital memory, and read out after performing descrambling processing based on a descrambling code corresponding to the scrambling code. By converting to an analog signal, a recording medium having scrambled recorded information can be reproduced satisfactorily.

By doing so, it is possible to reliably prevent unauthorized copies from being made from the recording medium on which copyright information is recorded.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the first invention;
The figure is a block diagram showing an embodiment of the second invention, FIG. 3 is a route map for explaining scrambling processing and descrambling processing, and FIGS. 4 and 5 are other embodiments of the first and second inventions. FIG. 2 is a block diagram showing an example. 1...Video signal recording device, 7.14.36.
44.65.85...Memory, 30...
・Video signal reproducing device, 60...8 MV
TR recording system, 8°...8 *Kasumi VTR
regeneration system.

Claims (3)

[Claims] (1) A signal characterized by converting an analog input signal into digital data, writing it in a digital memory, performing scrambling processing based on a predetermined scramble code, reading it out, and recording it on a recording medium as recorded information in a predetermined format. Processing equipment. (2) Reproduce the recorded information that has been scrambled and recorded on the recording medium, convert it to digital data, write it in the digital memory, perform descrambling processing based on the descrambling code corresponding to the scramble code, read it out, and convert it into an analog signal. A signal processing device characterized in that it transmits a reproduced signal consisting of: (3) The video signal and/or audio signal has recorded information recorded by performing scrambling processing based on a predetermined scrambling code, and is reproduced by performing descrambling processing based on a descrambling code corresponding to the above-mentioned scrambling code. A recording medium characterized in that significant information is obtained by.