JP3449077B2 - Video signal processing apparatus and video signal processing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a video tape recorder for recording an analog video signal from a video disc, a digital VCR, a digital broadcast receiver, and the like, and a television receiver for displaying the reproduced output thereof. Video signal processing device and video signal processing
Regarding the method of treatment.

[0002]

2. Description of the Related Art With the development of digital technology, it is becoming easy to obtain high-quality video signal sources even at home. For example, not only pre-recorded tape (soft tape) but also digital broadcasting terminals, DVD
(Digital Video Disc) and the like provide high-quality video signals to users. Digital VCRs (video cassette tape recorders) are gradually becoming popular for home use, but at present, analog VCRs are remarkably prevalent. From the standpoint of copyright protection, providers of high-quality video signals as described above have to pay a great deal of attention to the restriction of copying by the analog VCR.

In the analog VCR, some copy restriction methods have already been considered. For example, the AGC pulse method and the color stripe method by Macrovision are known. In the AGC pulse system, a pulse having a level higher than the normal AGC reference level is inserted into the AGC reference level detection section of the video signal to limit the detection. That is, the pseudo SYNC pulse is inserted in a part of the V (vertical) blanking period of the video signal. Analog video tape recorder (home analog VCR)
However, there are many models that are adapted to apply AGC by using a horizontal sync pulse and a pedestal level (back porch). Therefore, when the pseudo SYNC pulse having a larger amplitude than the normal horizontal sync pulse is inserted in the portion corresponding to the back porch, the AGC circuit determines the amplitude of the pseudo SYNC pulse as the reference level and the AGC. Can be applied. As a result, since the AGC level is detected as the level of this pseudo SYNC pulse, SY
NC cannot be detected and normal reproduction cannot be performed. on the other hand,
Since the television monitor has a different AGC system, it can display a reproduced image normally.

However, in this AGC pulse system, V
There is a problem that it is effective only for a part of the HS system video tape recorders. For example, β-type VCR or 8
Even in the mmVCR and VHS systems, there was no effect on those having a long AGC time constant.

Therefore, as another copy restriction method, the color stripe method described below has been proposed.
The color stripe method is a method of inverting the phase of the burst signal with respect to the reproduced video signal by, for example, 2 to 4 lines for every 20 lines. When the reproduced video signal in which the phase of the burst signal is inverted is recorded by another home analog VCR, the AP of the analog VCR is recorded.
Since C (automatic phase control circuit) uses the burst signal with the inverted phase as the original burst signal,
The color of that line is reversed and played back. Therefore, when the recorded video signal is reproduced, the band with the inverted color is displayed on the screen.

On the other hand, in a general television receiver, a PLL (A) that forms a carrier wave for color signal demodulation is used.
Since the time constant of (PC) is long, even if the burst signal is continuously inverted in 2 to 4 lines at most, there is no effect. However, depending on the model, there is a case where a PLL having a short time constant is used, and in this case, there is a problem in that a band in which colors are reversed appears on the screen.

Further, the applicant of the present application adds a phase-inverted signal to the rear side of the color burst signal period of all lines, and widens the width of this signal in places. Signal adding method). This method has an advantage of not causing such a problem even in a television monitor in which the image quality of a display image is deteriorated in the color stripe method described above.

[0008]

As described above, the method of performing copy restriction by making the phase of the color burst signal different from that of a normal television signal is a VCR.
The difference between the characteristics of the APC of APC and the characteristics of the APC of the television monitor is utilized, but there are various characteristics of the APC of the actual television monitor. Therefore, only one of the color stripe method and the copy prevention signal addition method has a problem that normal display cannot be performed on the television monitor even if the purpose of copy restriction can be achieved.

Therefore, an object of the present invention is to provide a video signal processing apparatus and a video signal processing method which allow a user to select, among different copy restriction methods, one that causes less interference with the display by a television monitor. To provide.

[0010]

In order to solve the above-mentioned problems, the present invention is a video signal processing for receiving a video signal for analog output from a video signal source, adding a signal for recording limitation and outputting the signal. An apparatus, comprising: first signal generating means for generating the first signal for recording restriction; and second signal generation for generating a second signal for recording restriction different from the first signal. Means, means for selecting one of the first signal and second signal in accordance with external control, and means for adding the selected first or second signal to the video signal. Do Ri, the second signal
Signals are added to the front side and / or the rear side of the color burst signal.
A signal added to a part of the section, and the color verse
Signal has a phase different from the original phase of the
And a video signal processing device .

The present invention is also directed to an audio signal from a video signal source.
Receives the video signal for analog output and
A video signal processing method for outputting by adding the issue, on
The first signal for limiting recording and the first signal are different from each other.
Generating a second signal for limiting recording as described above,
According to the control from the outside, the first signal and the second signal
Selecting one of the signals, and the first selected
Or a second signal to the analog video signal,
And the resulting second signal.
Is one of the front side and / or the rear side of the color burst signal.
The signal added to the section of the section and the color burst
The signal has a phase different from the original phase of the signal
Is a video signal processing method .

[0012]

[0013]

[0014]

First and second signals are prepared as recording restriction signals added to the analog video signal. When the analog VCR records / reproduces the analog video signal to which this signal is added, the image quality of the reproduced image deteriorates, whereby the copy restriction is achieved. On the other hand, when the analog video signal to which this signal is added is supplied to the monitor device, the monitor device is considered to be able to see a normal image without causing image quality deterioration. However, the image quality may deteriorate depending on the model of the existing monitor device. Therefore, in the present invention, the first and second signals are prepared as the signals added for copy restriction, and the user reproduces them on the monitor device and selects the signal with less image quality deterioration. Thereby, it is possible to prevent the image quality deterioration of the monitor image from being caused by the copy restriction signal.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below. To facilitate understanding of the present invention, an application example of copy restriction will be described with reference to FIG. Figure 1
Is an example in which an analog video signal reproduced by the digital VCR 2 is recorded by the analog VCR 1. The cassette tape reproduced by the digital VCR 2 is, for example, a pre-recorded tape, and control information (CGMS) regarding the copy generation limitation recorded in the tape is used.
(Referred to as “Copy Generation Management System”) instructs to prohibit copying, it is necessary to prohibit recording by the analog VCR 1.

FIG. 1B shows an example in which the reproduced analog video signal from the DVD player 3 is recorded by the analog VCR 1. Even in this case, the CGM recorded on the DVD
If S prohibits copying, analog V
Recording by CR1 needs to be prohibited. Further, FIG. 1C shows an IRD (Integeg) for receiving digital broadcasting.
Program received by rated receiver decoder (or set top box) 4 is digital VCR
Recorded by 5 and recorded contents by analog VCR1
This is an example of recording by. Generally, the digital VCR 5 is often permitted to record a digital broadcast program as a digital signal or an analog signal once. However, copying the recorded contents by the analog VCR 1 is limited. Of course, copying of the video signal from the IRD 4 to the analog VCR 1 may be prohibited.

The present invention prohibits copying by the analog VCR 1 in the case as illustrated in FIG. 1, and further, the digital VCR 2, the DVD player 3, the digital VCR.
It is possible to display the analog video signal from the monitor 5 on the monitor device without any trouble. FIG. 2 shows an embodiment of the present invention applied to the case of outputting an analog video signal reproduced by the DVD player 3 as in the example of FIG. 1B.

A digital signal compressed and encoded by MPEG or the like is read from the DVD 6 by the optical pickup 7. The reproduction signal of the optical pickup 7 is supplied to the error processing circuit 9 via the preamplifier, the waveform shaping and decoding circuit 8. In the error processing circuit 9, the error correction code is decoded and the error is corrected. The output of the error processing circuit 9 is supplied to the demultiplexer 10. The demultiplexer 10 separates video data, audio data, and control digital data from the reproduction signal.

The video data is supplied to the video decoder 11. The video decoder 11 performs processing such as decoding of compression encoding and conversion into an analog video signal, and supplies the analog video signal to the output unit 14. This output unit 1
4 is the one to which the present invention is applied, the details of which will be described later. An analog video signal to which a copy protection signal is selectively added is output from the output unit 14 to the output terminal 16. In the audio decoder 12, the audio data is subjected to processing such as decoding of compression encoding and conversion into an analog audio signal, and an analog audio signal is obtained at the output terminal 17. The digital data decoder 13 separates and decodes the control digital data recorded on the DVD 6. The decoded output is supplied to the microcomputer 15. CGMS is included in the control digital data.

The microcomputer 15 generates a CGMS pre-recorded on the DVD 6 and a control signal for instructing the addition of a signal for copy protection and the type of the added signal according to an instruction input from the outside by the user. To do. This control signal is given to the output unit 14. The output unit 14 is provided inside the DVD player.

The structure of an example of the output unit 14 is shown in FIG. The reproduced video signal from the video decoder 11 is supplied to the output unit 14 as, for example, an analog component signal. The luminance signal Y and the color difference signals RY and BY are supplied to the input terminals denoted by reference numerals 21, 22, and 23, respectively. The luminance signal Y is taken out to the output terminal 16Y via the adders 24 and 25. The color difference signals are supplied to the color encoder 26, and the color encoder 26 forms a carrier color signal subjected to quadrature two-phase modulation. This carrier color signal is taken out to the output terminal 16C via the adder 27.

In the adder 24, the normal composite sync signal generated by the sync signal generator 28 is added to the luminance signal Y. In the adder 25, the AGC pulse generator 29
Is supplied, and this AGC pulse is added to the luminance signal Y. The AGC pulse generator 29 generates one of a normal level and a large level for inhibiting copying as the AGC pulse. The selection is made by a control signal from the microcomputer 15.

A color burst signal is added to the adder 27. If copying is allowed, signal generator 3
The normal color burst signal SB1 generated in 1 is added. When the copy is prohibited, the first copy protection signal signal SB2 generated by the signal generator 32 or the second copy protection signal signal SB3 generated by the signal generator 33 is added. For the selection of these signals,
A switcher 35 controlled by the microcomputer 15 and a switcher 36 controlled by user selection are provided.

The switcher 36 has a copy protection signal signal SB2 supplied to its input terminals c and d, respectively.
And SB3 are selectively supplied to the input terminal b of the switcher 35 in accordance with the user selection. The switcher 35 uses the color burst signal SB from the signal generator 31.
1 is supplied to one of the input terminals a, and the switcher 36
Is supplied to the other input terminal b. The signal selected by the switcher 35 according to the user's selection is supplied to the adder 27.

The switcher 35 is controlled by a control signal generated by the microcomputer 15 based on the result of decoding the video signal reproduced from the DVD 6 and the accompanying CGMS. That is, when the CGMS indicates the prohibition of the analog copy, the switcher 35 selects the input terminal b and gives the copy protection signal signal SB2 or SB3 to the adder 27. Also, when the user supplies the analog video signal reproduced by the DVD player to the television monitor, he / she sees the quality of the display image, and inputs which one of the copy protection signal signals SB2 and SB3 is added by key input. Instructing via user interface such as button input. The switcher 36 is controlled based on the instruction. Therefore, when the video signal taken out to the output terminals 16Y and 16C is recorded by the analog VCR, the recording can be prohibited, and when the video signal is supplied to the television monitor, the reproduced image of high quality can be obtained. It becomes possible to see.

FIG. 4A shows an example of CGMS prerecorded in association with the digital video signal recorded on the DVD 6. As shown in FIG. 4A, CGMS is defined as follows. 00: Copy is possible 01: Not used 10: Copy one generation is possible 11: Copy is not possible

When copying in this CGMS defines only digital copy restriction, a flag indicating whether analog copy is possible, that is, a trigger bit for instructing generation of an analog copy restriction signal may be specified separately.
FIG. 4B is an example of the case. When the trigger bit is “0”, it is instructed not to generate the analog copy limit signal, and when this bit is “1”, the analog copy limit signal is generated. Is instructed. In this case, C
With a total of 3 bits of GMS and trigger bit,
The analog copy restriction information is configured. However, both analog and digital are defined by the CGMS, and the unused 2 bits (01) of the CGMS are used to generate the analog VC with 2 bits.
The copy restriction information by R may be configured.

Various forms are possible for actually recording such copy restriction information on a recording medium.
In the case of a digital VCR, the data structure shown in FIGS. 5 and 6 is adopted. FIG. 5 shows the structure of VAUX (video auxiliary data), which is (01100001) (6
1h) (h indicates hexadecimal display) is a pack having a pack header.

In this pack, CGMS is recorded as the upper 2 bits of PC1. The definition of this CGMS is
For example, it is the same as that shown in FIG. 4A. Also, the copy source in the PC 1 is defined as follows. 00: Copy by analog input 01: Copy by digital input 10: Reserve 11: No information

The definition of the copy generation in PC1 is shown below. 00: 1st generation 01: 2nd generation 10: 3rd generation 11: 4th generation

FIG. 6 shows an example of auxiliary data (AAUX data) relating to an audio signal in a digital VCR. The header of this pack is (01010001)
(51h). In this pack PC1, information on copy generation restriction is recorded in the same configuration as VAUX. When the CGMS associated with the input video signal is copyable for one generation and the input video signal is recorded, the CGMS on the tape is rewritten to copy prohibited.

In the case of the DVD according to the embodiment of the present invention, although not shown, the recording data has a delimiter such as a sector, and a sync signal and a header are added to the head of this delimiter. Information for copy restriction is recorded in this header.

Next, a signal added for copy restriction in the embodiment of the present invention will be described. The first signal is a signal for prohibiting copying generated by the signal generator 32.
The copy protection signal will be described first.

In an analog home VCR,
A color subcarrier having a frequency of 3.58 MHz (in the case of the NTSC system) is low-pass-converted into a low-pass conversion color signal having a predetermined center frequency within 600 to 700 KHz.
Then, the low-frequency converted color signal and the luminance signal are frequency-multiplexed and recorded on the magnetic tape. As described above, the color signal in the home-use analog VCR is very narrowly band-limited and recorded on the magnetic tape as compared with a television receiver or the like.

Therefore, when reproduced, the color burst signal included in the recorded video signal has the property of being expanded before and after the original signal before recording on the time axis due to band limitation. Have. FIG. 7 shows the color burst signal SB1 in the original signal and the signal after being reproduced by the VCR. When the original signal SB1 of the color burst signal arranged after the horizontal synchronizing signal h shown in FIG. 7A is recorded and reproduced on the magnetic tape, the color burst signal is expanded back and forth on the time axis as shown in FIG. 7B. To be done.

The first copy protection signal signal SB2 for copy protection is a signal for realizing copy protection by the copy protection signal addition system by utilizing this property. Figure 8
An example of the first copy protection signal signal SB2 will be described with reference to FIG. FIG. 8A shows a normal color burst signal SB.
1 is shown. On the other hand, FIG. 8B shows the pseudo burst signal b in which the phase is inverted behind the normal color burst signal a.
This is an example in which (indicated by diagonal lines) is inserted. Also, FIG. 8C shows
This is an example of a copy protection signal SB2 in which a pseudo burst signal b is inserted in front of the original signal a. Further, FIG. 8D shows an example of the copy protection signal SB2 in which the pseudo burst signals b and c are inserted before and after the original signal a. This pseudo burst signal b,
When the color signal c is inserted before and after the original signal a with respect to the color burst signal having 9 waves, two waves are inserted before and after the original signal a.

As described above, when the video signal added with the copy protection signal SB2 including the pseudo burst signals b and c is recorded and reproduced by the adder 27, the color signal is reproduced in accordance with the above-mentioned extension property on the time axis. The width of the pseudo burst signals b and c added before and after the original signal a of the burst signal increases. This state is shown in FIG. That is, FIG.
In the copy protection signal SB2 in which the pseudo burst signals b and c shown in A are inserted, the pseudo burst signal b,
After recording / reproducing with respect to the magnetic tape, the width of c is expanded in the front and rear direction as indicated by SB2 ′ in FIG. 9B.

Copy protection signal SB2 having an increased width
When a video signal containing a ‘′ is reproduced by a VCR, for example, the PLL cannot follow the color synchronization circuit of the VCR, which causes deterioration of the image, which can prevent copying. Of course, this video signal is
It goes without saying that a normal image cannot be obtained even when recording / reproducing by R.

On the other hand, the video signal including the copy protection signal SB2 in which the pseudo burst signals b and c are inserted before and after the color burst signal shown in FIG. 9A is detected as a substantially normal color burst signal on the television monitor. And used. Therefore, in this case, image deterioration does not occur. However, the AP of the television monitor
Depending on the characteristics of C, the image quality may deteriorate.
Therefore, the user generates a control signal for switching the switcher 36, and the second copy protection signal SB3 is generated.
Switch to add. In this way, by selecting a copy protection signal that causes less deterioration in image quality, it is possible to avoid obstacles when viewing an image on a television monitor.

FIG. 10 shows the above-mentioned copy protection signal SB.
2 illustrates an example of processing when 2 is generated in the signal generator 32. FIG. 10A shows a normal color burst signal SB1. FIG. 10B shows an example of generating the copy protection signal SB2 having the pseudo burst signal b behind the normal color burst signal a. A phase control pulse is generated based on the timing signal from the timing controller 33, and the pseudo burst signal b having the inverted phase is generated in the section of the phase control pulse.

FIG. 10C shows a normal color burst signal a.
An example in which a copy protection signal SB2 having pseudo burst signals b and c before and after is generated is shown. Also in this example, the phase control pulse corresponding to the pseudo burst signals b and c is used. Further, as shown in FIG. 10D, by generating both the phase control pulse and the gain control pulse based on the timing control pulse, the copy protection signal SB2 including the pseudo burst signal b whose gain is controlled together with the phase is generated. May be generated.

The above-mentioned copy protection signal SB2 is used.
Is related to the proposal of the applicant of the present application and has been described in detail. However, as the other copy protection signal SB3, a signal similar to the one called the conventional color stripe system is used. That is, for the reproduced video signal, for example, 2
The second copy protection signal SB3 is generated by inverting the phase of the entire color burst signals for 2 to 4 lines every 0 line. When the video signal in which the phase of the burst signal is inverted is recorded by the analog VCR, the APC (automatic phase control circuit) of the analog VCR is recorded.
However, since the burst signal whose phase is inverted is used as the original burst signal, the color of the line is inverted and recorded. Therefore, when this recorded video signal is played back, as shown in FIG. 11, a band in which the colors are inverted is displayed on the screen. As a result, copying can be restricted.

On the other hand, in the television monitor, since the time constant of the PLL forming the carrier wave for the color signal demodulation is long, even if the burst signals are continuously inverted in 2 to 4 lines at most, there is no effect. You can see the normal playback image. However, there is a television monitor in which the image quality deteriorates, and in this case, the user can select the first copy protection signal SB2 and thereby avoid the image quality deterioration.

Next, the first copy protection signal S
As modes for adding B2 to the analog video signal, there are several methods for effectively exhibiting the copy protection function. They will be explained.
FIG. 12 shows the first method, and in this example, as shown in FIG. 12A, the copy protection signal SB2 having the pseudo burst signals b and c before and after the color burst signal a is shown. The insertion positions of the burst signals b and c are devised. In FIG. 12B shown below, the horizontal direction indicates the horizontal direction of raster scanning, and the vertical direction indicates the vertical direction of raster scanning. The shaded area indicates the position where the pseudo burst signal exists within the vertical blanking period. This representation is common to other similar figures.

First, as shown in part d of FIG. 12B, the pseudo burst signals c and b are inserted over a continuous block of several lines to several tens of lines, and this is repeated every 100 lines, for example. Next, a part of the pseudo burst signal b is further inserted into several lines to several hundred lines before and after the d section with a width shorter than that inserted in the d section of FIG. 12B (e section of FIG. 12B). By thus adding the copy protection signal SB2, it is possible to effectively cause image deterioration when copying is performed. Further, depending on the characteristics of the television monitor, this copy protection signal SB2 may cause image quality failure. This can be alleviated by providing a portion in which the copy protection signal SB2 is not inserted, as shown in part f of FIG. 12B. It is preferable that the f portion is set near the vertical synchronizing signal.

Here, in order to increase the deterioration of the image due to the copy guard, the number of blocks (the number of lines) of the d portion in FIG.
If the number is increased, the PLL for the color burst signal may not be able to follow up even in the television monitor, which may cause an unstable state. Therefore, as shown in FIGS. 13A and 13B, by arranging blocks to which the pseudo burst signals b and c are added, for example, every field or every frame, the effective area where the image deteriorates is increased. You can This division method can be performed over several frames.

FIG. 14 shows another example of the manner of adding the pseudo burst signal. In the home analog VCR, the position and width of the burst gate for detecting the burst signal may differ depending on the specifications. Since the pseudo burst signal is inserted only in a part of the burst signal period for the copy protection signal SB2, the copy guard effect may not be obtained if the position and width of the burst gate are different. Therefore, in the example shown in FIG.
Part, j part, k part, and l part, the position and width of inserting the pseudo burst signal are changed with time. By doing so, even if the positions and widths of the burst gates are different, the influence of the copy protection signal can be exerted.

FIG. 15 shows another example of the manner of adding the pseudo burst signal. Depending on the specifications of the television monitor, when a pseudo burst signal is inserted like the part e, a flicker phenomenon may occur at the boundary between the block in which the pseudo burst signal is inserted and the line in which it is not inserted. Therefore, as shown in FIG. 15, the width of the pseudo burst signal is gradually changed in the m portion and the n portion corresponding to the beginning and the end of the block in which the pseudo burst signal exists. By doing so, the flicker phenomenon on the television monitor can be prevented.

In one embodiment of the present invention, the AGC pulse generated by the AGC pulse generator 25 is controlled in accordance with CGMS in order to prevent the copy by the above-mentioned pseudo burst signal and ensure the copy protection more surely. . That is, in the case of copy prohibition, a pseudo sync pulse having a level higher than the normal AGC reference level is inserted in the AGC reference level detection section in the video signal. For example, as shown in FIG. 16A, the pseudo sync C pulse is inserted in a part of the V blanking period of the video signal. FIG. 16B is an enlarged view showing a portion where the pseudo sync pulse is inserted. This pseudo sync pulse is
For example, 5 waves are inserted at a level obtained by adding the level p to the horizontal synchronizing pulse. Also, this level p is changed and inserted.

In the analog VCR, V shown in FIG. 16C is used.
There are many models adapted to apply AGC by using a 1H horizontal synchronizing pulse in the blanking period.
Therefore, when a pseudo sync pulse having a larger amplitude than the horizontal sync pulse is inserted at 1H, the AGC circuit determines the amplitude of the pseudo sync pulse as the reference level and A
GC is applied. As a result, since the AGC level is detected as the level of this pseudo sync pulse, the sync signal cannot be detected by amplitude separation, and normal reproduction cannot be performed. By using such an AGC pulse system together, copy guard can be performed more reliably.

In the embodiment of FIG. 3, two types of copy protection signals are prepared and one of them is selected by the user, but three or more types of copy protection signals may be prepared. good. Specifically, the first copy protection signal SB2
The modification described above may be used as the third copy protection signal.

In the configuration of FIG. 3, the normal burst signal SB1, the first and second copy protection signals SB2,
Although the generation circuit of SB3 is shown as a separate block, as described above, since the copy protection signal is generated by controlling the phase of the color subcarrier, some hardware of these generation circuits is used. Can be shared. Although an adder is used to add a copy protection signal, a normal color burst signal may be added and then a modulation circuit that changes the phase only for a predetermined period may be used. good. Furthermore, in the present invention, the copy protection signal may be added to the composite signal format in which the luminance signal and the carrier color signal are superimposed, instead of the component signal format.

[0054]

As described above, according to the present invention, when a copy is prevented by adding a copy protection signal that makes the phase of the burst signal different from the normal one, a television monitor is used. When viewing this video signal, it is possible to prevent deterioration of image quality. Further, in the present invention, a pre-recorded tape,
Since information for restricting copying is recorded together with the digital video signal on a recording medium such as a DVD, it is possible to surely prevent copy.

[Brief description of drawings]

FIG. 1 is a block diagram showing some examples of a video signal recording system to which the present invention can be applied.

FIG. 2 is a block diagram of an embodiment in which the present invention is applied to the case of recording a reproduced analog signal of a DVD player.

FIG. 3 is a block diagram of an output unit to which the present invention is applied.

FIG. 4 is a schematic diagram used to describe an example of CGMS and a trigger bit that instructs generation of a copy restriction signal.

FIG. 5 is a CG used in a digital VCR.
FIG. 6 is a schematic diagram used to describe an example of a recording method of MS.

FIG. 6 is a CG used in a digital VCR.
FIG. 6 is a schematic diagram used to describe an example of a recording method of MS.

FIG. 7 is a waveform chart showing a color burst signal in an original signal and a color burst signal after reproduction.

FIG. 8 is a waveform diagram showing some examples of a first copy protection signal.

FIG. 9 is a waveform diagram showing that the width of the copy protection signal has increased after reproduction.

FIG. 10 is a timing chart for explaining some methods for generating a first copy protection signal.

FIG. 11 is a schematic diagram for explaining copy protection by a second copy protection signal.

FIG. 12 is a first method of adding a first copy protection signal.
It is an approximate line figure showing an example of.

FIG. 13 is a second method of adding a first copy protection signal.
It is an approximate line figure showing an example of.

FIG. 14 is a third method of adding a first copy protection signal.
It is an approximate line figure showing an example of.

FIG. 15 is a fourth method of adding the first copy protection signal.
It is an approximate line figure showing an example of.

FIG. 16 is a waveform diagram for explaining the AGC pulse system.

[Explanation of symbols]

6 DVD 14 Output section for outputting reproduced analog video signal 15 Microcomputer 16, 16Y, 16C output terminals 24, 25, 27 adder 31 Signal generator for generating normal burst signal 32 A signal generator for generating a first copy protection signal 33 A signal generator for generating a second copy protection signal 35 Microcomputer controlled switcher 36 Switcher controlled by user's instruction SB1 Normal color burst signal SB2 First copy protection signal SB3 Second copy protection signal b, c Pseudo burst signal

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Claims (6)

(57) [Claims] 1. A video signal processing device for receiving a video signal for analog output from a video signal source, adding a signal for recording limitation and outputting the signal, wherein the first signal for recording limitation is generated. First signal generating means, second signal generating means for generating the second signal for recording restriction different from the first signal, and one of the first signal and the second signal means for selecting under control of the the first or second signal said selected with respect to the video signal, Ri Do and means for adding said second signal, the color burst signal forward or /
And the signal added to a part of the rear side, and
Has a phase different from the original phase of the color burst signal
A video signal processing device characterized by being a signal. 2. The apparatus according to claim 1, wherein when the copy generation restriction information associated with the video signal to be output indicates a copy-prohibited state, one of the first and second signals is supplied to the video signal. A video signal processing device characterized by being added as a result. 3. The video signal processing according to claim 1, wherein the first signal is a signal that inverts a phase of a color burst signal for several lines for every predetermined number of lines. apparatus. 4. A video for analog output from a video signal source.
Receives a video signal, adds a signal for recording restriction, and outputs
The video signal processing method according to claim 1, wherein the first signal for recording limitation is different from the first signal.
Generating the second signal for recording limitation
When, in accordance with external control, the first signal and the second
Selecting one of the signals, and selecting the first or second selected signal from the analog
As a result, the step of adding to the audio signal
Ri, the second signal, the color burst signal forward or /
And in the added signal between a portion of the ward of the rear side, and the
Has a phase different from the original phase of the color burst signal
A video signal processing method characterized by being a signal. 5. The method according to claim 4, wherein the copy generation restriction information associated with the output video signal is
The first and second signals when indicating the peak prohibition state.
One of the features is to add one to the video signal as a result.
Video signal processing method. 6. The method according to claim 4, wherein the first signal is a number of lines for every predetermined number of lines.
Signal that inverts the phase of the Lar burst signal
Characterized video signal processing method.