JP2003348618A - Recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording medium for storing a control signal to instruct production of a recording limit signal for surely limiting recording of an analog video signal. <P>SOLUTION: Burst signals of which phases are partly inverted are applied to lines 5n+0, 5n+2, a burst correction signal with large amplitude is applied to lines 5n+1, 5n+3, and a regular burst signal is applied to a line 5n+4. The signals on the five lines are used for a macro block, and a plurality of the macro blocks form a block for copy preventing signals. The control signal on the recording medium is used to instruct attachment of a recording limit signal to a reproduced analog video signal. Since the inverted burst signal is intermittently applied to the line, the frequency in the unit of the lines is increased, no image disturbance takes place on a monitor with a narrow APC frequency response range but is caused in a VCR with a wide APC frequency response range. Since the burst correction signal is applied to the lines, the integration characteristic of the burst signal is corrected and disturbance can be corrected even on the occurrence of disturbance on the monitor. <P>COPYRIGHT: (C)2004,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium reproduced by a video disk, a digital VCR, and the like, and more particularly, to a recording restriction signal for restricting recording of an analog video signal reproduced from the recording medium. It relates to a recording medium.

[0002]

2. Description of the Related Art With the development of digital technology, high-quality video signal sources are easily available at home. For example, not only pre-recorded tape (soft tape) but also digital broadcasting terminals, DVD
(Digital video disk) and the like provide a user with a high quality video signal. Digital VCRs (video cassette tape recorders) are gradually becoming popular for home use, but at present, analog VCRs have become much more popular. As described above, a provider of a high-quality video signal has to pay great attention to restrictions on copying by an analog VCR from the viewpoint of copyright protection.

[0003] For the analog VCR, some copy restriction methods have been considered. For example, an AGC pulse method and a color stripe method by Macrovision are known. In the AGC pulse method, when copying is prohibited, a pulse having a level higher than a normal AGC reference level is inserted into an AGC reference level detection section of a video signal to limit the period. That is, the pseudo SYN is applied to a part of the V (vertical) blanking period of the video signal.
C pulse is inserted. For example, as shown in FIG. 13A, a pseudo sync pulse is inserted in a part of the V blanking period of the video signal. FIG. 13B shows an enlarged portion where the pseudo sync pulse is inserted. For example, five pseudo sync pulses are inserted at a level obtained by adding the level p to the horizontal sync pulse. The level p is changed and inserted.

Analog VCR (Home Analog VCR)
Then, 1 in the V blanking period shown in FIG.
There are many models that perform AGC using the H horizontal synchronization pulse. Therefore, when a pseudo sync pulse having a larger amplitude than the horizontal sync pulse is inserted into 1H, the AGC circuit determines that the amplitude of the pseudo sync pulse is the reference level and performs AGC. As a result, since the AGC level is detected as the level of the pseudo sync pulse, the sync signal cannot be detected by the amplitude separation, and normal reproduction cannot be performed. On the other hand, a television monitor can display a reproduced image normally because the AGC system is different.

[0005]

However, this AGC
The pulse method has a problem that it has no effect on some video cassette recorders. For example, even in a β-type VCR, an 8 mm VCR, and a VHS method, an AGC
There was no effect for the one with a long time constant.

Therefore, a color stripe system described below has been proposed as another copy restriction method.
The color stripe method is a method of inverting the entire phase of a color burst signal (hereinafter, appropriately referred to as a burst signal) for a reproduced video signal by, for example, four lines every 21 lines. When the reproduced video signal whose phase of the burst signal is inverted is recorded by another analog VCR for home use, the APC (automatic phase control circuit) of the analog VCR uses the burst signal whose phase is inverted as the original burst signal. Since the line is used, the color of the line is inverted and recorded / reproduced. Therefore,
When this recorded video signal is reproduced, bands whose colors are inverted are projected on the screen every 21 lines as shown in FIG.

On the other hand, in a general television receiver, a PLL (A) for forming a carrier for demodulating color signals is used.
Since the time constant of (PC) is long, there is no effect even if the burst signal is continuously inverted in at most four lines. However, depending on the model, a PLL having a short time constant may be used, and in this case, there is a problem that a band whose color is inverted is generated on the screen.

Further, the applicant of the present application has proposed a copy restriction method for inverting the phase of a part of the burst signal of all lines in the effective screen.
This method is based on the color stripe method described above.
There is an advantage that such a problem does not occur even for a television monitor in which the quality of a displayed image is deteriorated.

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

Therefore, when the burst signal included in the recorded video signal is reproduced, the reproduced signal is limited due to band limitation.
Compared to the original signal before recording, it has the property of being extended before and after on the time axis. FIG. 15 shows a burst signal in an original signal and a signal reproduced by a VCR. When the original signal a of the burst signal arranged after the horizontal synchronizing signal h shown in FIG. 15A is recorded on the magnetic tape and reproduced, the burst signal a is expanded back and forth on the time axis as shown in FIG. 15B. A burst signal a 'is generated.

A method of preventing copy by utilizing this property is a method of inverting a part of the phase of a burst signal.
FIG. 16 shows an application example of this method. In a normal line, for example, a burst signal of 10 waves is arranged after the horizontal synchronization signal h (FIG. 16A). On the other hand, in order to cause image disturbance for copy protection, a burst signal including an inverted burst signal of a total of 13 waves of a 6-phase burst signal and a 7-phase normal phase burst signal whose phases are inverted. Is provided as a copy protection signal (FIG. 16B). On the screen, for example, 17 normal lines and 4 lines including an inverted burst signal are repeated on the screen at a cycle of 21 lines (FIG. 16C).

As described above, when a video signal on which a line including an inverted burst signal is arranged is reproduced by, for example, a VCR, the PLL cannot follow the color synchronizing circuit of the VCR, causing deterioration of an image. Can be prevented. Of course, this video signal is
Even when recording / reproducing by CR, a normal image cannot be obtained. The video signal including the inverted burst signal is detected and used as a substantially regular burst signal in a television monitor. Therefore, this video signal is displayed on the television monitor as a substantially normal screen.

However, since this system utilizes the fact that the frequency band of the color signal of the VCR is narrow, an analog VC such as S-VHS having a wide band of the color signal is used.
For R, there was a problem that the copy protection effect was insufficient.

As a countermeasure, a method of increasing the wave number of the inverted burst signal to increase the copy protection effect can be considered. For example, as shown in FIG. 17, it is conceivable to form a copy prevention signal with a total of 13 waves of 10 inverted burst signals and 3 normal phase burst signals. With this method, a copy protection effect can be produced even with a VCR having a wide band of color signals, but there is a problem in that some television monitors may have significant image disturbance. For example, color reversal does not occur, but image disturbances such as stripes having different densities in the horizontal line direction and color changes in the entire screen sometimes appear.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a recording medium in which there is little obstruction to the display on a television monitor and a recording restriction is made so as to ensure a copy protection effect. .

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention detects the state of a control signal provided on a recording medium, and records an analog video signal based on the detected output. A video signal reproducing apparatus or a video signal reproducing method for generating a recording restriction signal for restricting the recording, wherein the recording medium is a recording restriction signal for restricting recording of an analog video signal in a pack. Has a pack structure for storing a control signal for instructing whether or not to generate a digital video signal, in a case where recording of an aspect of an analog video signal is restricted, a digital video signal is reproduced by a reproducing apparatus, and the analog video signal is reproduced as an analog video signal. When outputting, the phase of the color burst signal in the analog video signal is partially inverted to limit the phase of the color burst signal for recording restriction. The inverted lines, thereby generating a recording restriction signal is arranged on one or more lines every is a recording medium characterized in that the control signal indicates.

The present invention also relates to a video signal reproducing apparatus for detecting a state of a control signal provided on a recording medium and generating a recording restriction signal for restricting recording of an analog video signal based on the detected output. Or a recording medium corresponding to a video signal reproducing method, wherein the recording medium is
A sector structure for storing a control signal for instructing whether or not to generate a recording restriction signal for restricting recording of the form of the analog video signal with respect to the header added to the sector; In the case where recording is restricted, when a reproducing apparatus reproduces a digital video signal and outputs the digital video signal as an analog video signal, for recording restriction, the phase of a color burst signal in the analog video signal is partially inverted, and color reproduction is performed. A recording medium characterized in that a control signal instructs to generate a recording restriction signal in which lines in which the phase of a burst signal is partially inverted are arranged every other or plural lines.

A control signal is recorded on a header added to a pack or a sector on a recording medium. The control signal instructs whether to generate a recording restriction signal for restricting recording in the form of an analog video signal. In order to restrict the recording, a line in which the phase of the burst signal is partially inverted with respect to the reproduced video signal is arranged every other or every other line. The burst signal whose phase is partially inverted causes image disturbance, thereby preventing copy. Further, since this signal is arranged every other or every other line, no image disturbance occurs on the television monitor, and the image disturbance can be caused only when the signal recorded on the video tape is reproduced. .

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. To facilitate understanding of the invention,
An application example of the copy restriction will be described with reference to FIG.
FIG. 1 shows an example in which an analog video signal reproduced by a digital VCR 2 is recorded by an analog VCR 1. The cassette tape reproduced by the digital VCR 2 is, for example, a pre-recorded tape, and control information (CG) relating to the restriction of the copy generation recorded on the tape is used.
MS (Copy Generation Management System)
Indicates that copying should be prohibited, it is necessary to prohibit recording by the analog VCR1.

FIG. 1B shows an example in which a 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
When the copy prohibition is instructed by S, the analog V
Recording by CR1 needs to be prohibited. Further, FIG. 1C shows an IRD (Integ) for receiving a digital broadcast.
rated Receiver Decoder) (or set-top box) 4
5 and record the recorded contents on the analog VCR 1
This is an example in which recording is performed by the following. Generally, it is often allowed that the digital VCR 5 records a digital broadcast program once as a digital signal or an analog signal. However, copying of the recorded content by the analog VCR 1 is restricted. Of course, the copying of the video signal from the IRD 4 to the analog VCR 1 may be prohibited.

According to the present invention, in the case illustrated in FIG. 1, copying by the analog VCR 1 is prohibited, and the digital VCR 2, the DVD player 3, the digital VCR
5 can be displayed without any trouble by the monitor device. FIG. 2 shows an embodiment of the present invention applied to a case where an analog video signal reproduced by the DVD player 3 is output 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 reproduced signal from the optical pickup 7 is supplied to an error processing circuit 9 via a preamplifier, a waveform shaping and decoding circuit 8. The error processing circuit 9 decodes the error correction code and corrects the error. The output of the error processing circuit 9 is supplied to a demultiplexer 10. The demultiplexer 10 separates video data, audio data, and control digital data from the reproduction signal.

The video data is supplied to a video decoder 11. The video decoder 11 performs processing such as decoding of compression encoding and conversion to an analog video signal, and supplies the analog video signal to the output unit 14. This output unit 1
Reference numeral 4 denotes an embodiment to which the present invention is applied, and details thereof 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. The audio data undergoes processing such as compression encoding decoding and conversion into an analog audio signal in the audio decoder 12, and an analog audio signal is obtained at an output terminal 17. The digital data decoder 13 separates and decodes the control digital data recorded on the DVD 6. CGMS is included in the control digital data, and a copy control signal is formed based on the CGMS. The copy control signal is provided to the output unit 14. This output unit 14 is provided inside the DVD player.

FIG. 3 shows an example of the configuration of the output section 14. The reproduced video signal from the video decoder 11 is supplied to the output unit 14 as, for example, an analog component signal. A luminance signal (including a synchronization signal) Y, a color difference signal RY,
BY are supplied respectively. The luminance signal Y is added to the adder 24.
Through the output terminal 16Y. The color difference signal is supplied to the color encoder 25, and the color encoder 25 forms a carrier color signal (including a burst signal) that has been subjected to quadrature two-phase modulation. The carrier color signal from the color encoder 25 is supplied to one input terminal a of the switcher 26. The switcher 26 is provided for replacing a burst signal. Output of switcher 26 is output terminal 1
It is taken out to 6C.

In one embodiment of the present invention, in order to further ensure the effect of copy protection, a burst signal in which a signal whose phase is inverted with respect to the burst signal is inserted before the burst signal, and the amplitude of the burst signal Is used instead of a burst correction signal and a burst correction signal, which is larger than a normal one. These copy protection signal and burst correction signal are inserted at the same timing as the normal burst signal. Further, in one embodiment of the present invention, the above-mentioned AGC pulse method is also used.

In the adder 24, an AGC pulse generator 28
Is supplied, and this AGC pulse is added to the luminance signal Y. The AGC pulse generator 28 generates one of a regular level AGC pulse and a large level AGC pulse for copy prohibition. The selection is made by a copy control signal supplied from the data decoder 13 (see FIG. 2) to the input terminal 36.

The burst signal supplied to the input terminal b of the switcher 26 is output from the switcher 27. The switcher 26 is controlled by an output of the timing controller 35. That is, when the copy control signal indicates that copying is permitted, the input terminal a is always selected, and the burst signal is not replaced. On the other hand, when copy prohibition is instructed by the copy control signal, the input terminal b is selected in a period slightly longer than the period of the burst signal, and the burst signal is replaced. Therefore, the output terminals 16Y, 16C
In the case where the video signal extracted in the above is recorded by an analog VCR, the recording can be prohibited. As described above, the control mode of the switcher 26 differs according to the permission / prohibition of the copy. Therefore, the timing controller 35 receives the synchronization signal separated by the synchronization separation circuit 34 and the copy control signal from the input terminal 36. You.

The normal burst signal SB1 generated by the signal generator 31 is supplied to the input terminal c of the switcher 27. The burst signal SB2 including the inverted burst signal generated by the signal generator 32 is supplied to the input terminal d of the switcher 27. The burst correction signal SB3 generated by the signal generator 33 is supplied to the input terminal e of the switcher 27.

FIG. 4 shows an example of the waveforms of these signals SB1, SB2, and SB3. FIG. 4A shows an example of the normal burst signal SB1. In this example, the signal SB1 is
Consists of 10 waves. In the burst signal SB2 including the inverted burst signal shown in FIG. 4B, three waves are added before the 10 waves of the signal SB1, and the first 10 waves including the added 3 waves are compared with the normal burst signal. The phase is inverted. The burst correction signal shown in FIG. 4C has a different amplitude from the signal SB1 shown in FIG. 4A. In this example, the amplitude is the signal SB1
Is increased by 5 dB.

Although not shown, a burst signal SB1 having a regular frequency generated by the signal generator 31 is provided.
Is the same as the normal burst signal,
5 has a constant phase relationship with the color subcarrier signal used. Therefore, the burst signal may be switched only on the line to which the burst signal SB2 including the inverted burst signal and the burst correction signal SB3 are added without providing the signal generator 31. Further, in the configuration of FIG. 3, the luminance signal Y includes a synchronization signal, and the color encoder 2
Although 5 is assumed to generate a burst signal, a circuit for generating a synchronization signal and a burst signal may be provided, and the generated synchronization signal and burst signal may be added to the luminance signal and the carrier chrominance signal, respectively.

FIG. 5 shows an example of an arrangement of a line including an inverted burst signal and a line provided with a burst correction signal in the present invention. In this example, the arrangement is performed in units of five horizontal lines of the video signal, and these five lines are used as macroblocks (minimum constituent units) of the copy protection signal. Of the five lines, the first line ([5n + 0] line) and the [5n + 2] line are provided with lines to which a burst correction signal is added. [5n
Lines including the inverted burst signal are arranged on the [+1] line and the [5n + 3] line. Also, a line in which a normal burst signal is added to the [5n + 4] line is arranged.

As described above, in this embodiment, the line including the inverted burst signal and the line on which the burst correction signal is arranged are alternately arranged to form a macroblock of a copy protection signal. In this example, a block of the copy protection signal is formed by a plurality of, for example, eight macroblocks.

The effect on a television monitor and a VCR when a line including an inverted burst signal and a line including a burst correction signal are arranged in such a macroblock will be described. FIG. 6 shows an example of the configuration of an APC circuit used for color demodulation in a television monitor. An input video signal (in this case, a chroma signal is extracted and used as an input chroma signal) is supplied to a color demodulation circuit 30 and a burst extraction circuit 3
1 is supplied. A burst signal extracted from the input chroma signal in the burst extraction circuit 31 is supplied to a phase detection circuit 32. In this example, the phase detection circuit 3
2, a multiplier type capable of detecting information in the amplitude direction of a signal is used.

The phase detection circuit 32 is also supplied with a reference subcarrier signal from a VXO (Voltage Controlled Oscillator) 34, compares the phase of the reference subcarrier signal with the burst signal, and detects the phase of the burst signal. The burst signal detected by the phase detection circuit 32 is applied to the low-pass filter 3.
3 and is supplied to a VXO 34, where a reference subcarrier signal phase-locked to the phase of the burst signal is generated. These phase detection circuits 3
2, a low-pass filter 33 and a VXO 34 constitute a PLL that is phase-locked to a burst signal. Thus, the reference subcarrier signal generated by the VXO 34 is supplied to the color demodulation circuit 30, and the color demodulation of the chroma signal is performed.

The frequency response characteristic of the APC of this television monitor shows a characteristic as a low-pass filter, that is, an integral characteristic, as shown by a solid line in FIG. VC
The characteristics of the APC at R also have integral characteristics,
This has a wider bandwidth than the television monitor, as indicated by the broken line in FIG.

The burst signal arrives intermittently at the cycle of the horizontal synchronizing signal. In the above-described APC circuit, a process of extracting only the intermittently arriving burst signal and generating a reference subcarrier is performed. FIG. 8 schematically shows this state. When only the burst signal is extracted, a repetition frequency is formed by the line including the inverted burst signal and the normal line.

In the method in which four lines including the inverted burst signal are arranged consecutively as described in the reference example proposed earlier (FIG. 8A), the line by line by the inverted burst signal is used. When the repetition frequency is A in the television monitor, for example, as f1 in FIG.
It falls within the frequency response range of the PC. Therefore,
The APC is pulled into the phase of the inverted burst signal, and the image is disturbed.

Therefore, as shown in the present invention, by intermittently arranging the line including the inverted burst signal at one line interval, as shown in FIG. 8B, the repetition frequency in line units by the inverted burst signal is obtained. Can be raised. Therefore, this repetition frequency is, for example, as shown in f2 in FIG.
, And within the frequency response range of the VPC APC. Therefore, according to this method, in the television monitor, the PLL does not pull in the inverted burst signal, so that no image disturbance occurs. However, in the VCR, the PLL generates color inversion in response to the inverted burst signal, Image interference due to signals can be caused.

However, depending on the television monitor, the frequency response range of the PLL is wider than the above-mentioned assumption, and image interference may occur even if the inverted burst signal is intermittently arranged at one-line intervals. In this case, for example, even if the color inversion does not occur, it appears as a hindrance that the color density and the like change.

In order to correct the image disturbance, in this embodiment, a line in which the above-described burst correction signal is provided is further arranged. The correction of image disturbance by the burst correction signal is effective when the phase detection circuit 32 of the APC is a multiplier type capable of detecting information in the amplitude direction of the burst signal as in this example. As described above, since the frequency characteristic of the APC has an integral characteristic, the information in the amplitude direction is detected by the phase detection circuit 32, so that the conversion between the wave number of the burst signal and the signal level can be performed. You.

In this embodiment, among the lines constituting the macroblock of the copy protection signal, the lines on which the burst signal is arranged by signals other than the normal burst signal are two lines including the inverted burst signal and the burst line. There are a total of four lines, two lines including the correction signal. In these four lines, originally 10 [waves] × 4 [lines] = 40 [waves]
Burst signals exist. In contrast, in this macro structure, the position of the original burst signal is 7
There are inverted waves of [wave] × 2 [lines] = 14 [waves], and there are only 26 waves of a burst signal having a normal phase including the burst correction signal.

Therefore, 14 waves of the inverted burst signal are canceled, and the burst signal 2 having the normal phase is canceled.
The effect of a normal burst signal for 40 waves is obtained by correcting 20 waves for 2 lines that do not include the inverted burst signal among the 6 waves. Therefore, in these two lines, 20 [waves] ×
The amplitude of the normal burst signal is increased based on x that satisfies x + 6 [waves] to 40 [waves]. In this example, by setting x to 1.78, which represents an increase of 5 dB,
0 [wave] × 1.78 + 6 [wave] ≒ 41 [wave], which satisfies the condition. That is, the amplitude of the normal burst signal is set to +5 dB in these two lines, and a burst correction signal is formed.

If the phase detection circuit 32 does not detect information in the amplitude direction of the signal, the correction effect cannot be obtained because the amplitude component is not originally used.
However, no interference is caused by the burst correction signal. That is, since the burst correction signal also has the same phase as the normal burst signal, it can play the same role as the original burst signal.

In the above description, in the macroblock of the copy protection signal, a line including an inverted burst signal and a line on which a burst correction signal is arranged are alternately arranged two by two, and a normal burst signal is further arranged. However, the configuration is not limited to this example. In other words, the macro structure may have another configuration as long as the line including the inverted burst signal is intermittently arranged every other line.

For example, a set of two lines, one line on which a burst correction signal is arranged and one line including an inverted burst signal, may be formed as a macro structure. Further, a set of two lines, one line in which the normal burst signal is arranged and one line including the inverted burst signal, may have a macro structure. Further, in the macro structure composed of the five lines described above, the line in which the burst correction signal is arranged may be replaced with the line in which the normal burst signal is arranged.

By arranging the copy protection signal having such a macroblock structure on the screen in a predetermined manner, image interference actually occurs on the screen, and a copy protection effect can be obtained.

FIG. 9 shows an example of a method of arranging a copy protection signal by such a macroblock and another example. FIG. 9A is an example in which blocks of a copy protection signal and blocks having a normal burst signal that does not include the copy protection block are alternately arranged. In this example,
The block of the copy protection signal is composed of 8 macroblocks, that is, 40 lines (shaded portions in the drawing), and the copy protection block and 40 lines having a normal burst signal not including the copy protection signal. And are alternately arranged. Of course, the number of lines of 40 lines in this case is an example, and the present invention is not limited to this example.

FIG. 9B shows an example in which the main part of the screen is filled with copy protection blocks. In this way, by arranging the copy protection signal for the main part of the screen as a whole, if the copy protection signal causes image interference such as a change in color density on the television monitor, the copy protection signal may be disturbed. If so, this obstruction can be made inconspicuous.

Further, in the above-described example, the arrangement of the copy protection signal is performed for continuous fields. This is not limited to this example, and a copy prevention signal may be intermittently arranged every few fields.

In the example shown in FIG. 9A, if the blocks of the copy protection signal are arranged at the same position for each field, flicker can be reduced. Also,
Blocks of copy protection signals and blocks of normal burst signals can be alternately arranged for each field. Furthermore, the block of the copy protection signal is
You may make it move for every field.

FIG. 10A shows an example of a CGMS recorded in advance together with a digital video signal recorded on the DVD 6. As shown in FIG. 10A, CGMS
Is defined as follows: 00: Copy possible 01: Not used 10: Copy 1 generation possible 11: Copy not possible

When the copy in the CGMS specifies only the digital copy restriction, a flag indicating whether or not analog copying is possible, that is, a trigger bit for instructing the generation of an analog copy restriction signal may be separately specified.
FIG. 10B is an example, in which the trigger bit is' 0
If this bit is "0", it is instructed not to generate an analog copy restriction signal, and if this bit is "01", it is instructed to generate only an AGC signal by the AGC pulse method among the analog copy restriction signals. If this bit is "11", it is instructed to generate the AGC signal and the first copy protection signal to which the present invention is applied.
This first copy protection signal is, for example, a signal in which blocks composed of the macroblocks shown in FIG. 5 described above are arranged as shown in FIG. 9A. Bit '10'
May be unused, but as shown in FIG. 10B, it is instructed to generate, together with the AGC signal, a second copy protection signal having a different arrangement from the above-described first copy protection signal. Is possible. In this case, CGM
Analog copy restriction information is constituted by a total of 4 bits of S and the trigger bit.

In this example, the generation of the copy restriction signal by the AGC pulse method and the generation of the copy restriction signal to which the present invention is applied are controlled by one trigger bit. However, this is not limited to this example. Not something.
That is, by supplying the corresponding trigger bits from the data decoder 13 shown in FIG. 1 described above, the generation of the copy restriction signal by the AGC pulse method and the generation of the copy restriction signal to which the present invention is applied can be performed.
Can be controlled independently.

Various forms are possible for actually recording such copy restriction information on a recording medium.
In the case of a digital VCR, the data configuration shown in FIGS. 11 and 12 is adopted. FIG.
(01100000) indicates the configuration of (video auxiliary data).
1) A pack having a pack header of (61h) (h represents hexadecimal notation).

In this pack, CGMS is recorded as the upper two bits of PC1. The definition of this CGMS is:
For example, it is the same as that shown in FIG. 10A. PC1
The copy source in is defined as follows. 00: Copy by analog input 01: Copy by digital input 10: Reserved 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. 12 shows an example of auxiliary data (AAUX data) relating to an audio signal in a digital VCR. The header of this pack is (0101000
1) (51h). This pack PC1 includes VAU
With the same configuration as X, information on copy generation restriction is recorded. Note that CGMS accompanying the input video signal is 1
When the input video signal is recorded when generation copying is enabled, the CGMS on the tape is rewritten to copy prohibited.

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

In the configuration of FIG. 3, the signal generator 31,
Although 32 and 33 are shown as separate blocks, this is not limited to this example. For example, an amplifier and a phase delay circuit may be connected to one signal generator, and the amplifier and the phase delay circuit may be controlled by the timing controller 35. That is,
When a normal burst signal is generated in a signal generator and an inverted burst signal is added, a phase delay circuit is controlled to invert the phase for a predetermined period, and when a burst correction signal is provided, The amplifier is controlled to amplify the normal burst signal at a predetermined gain. Further, in the present invention, a copy prevention signal may be added to a composite signal format in which a luminance signal and a carrier chrominance signal are superimposed, instead of a component signal format.

[0060]

As described above, the recording medium according to the present invention has a pack structure or a sector structure for recording a control signal for instructing whether or not to generate a recording restriction signal. The control signal instructs whether to limit the recording of the mode of the analog video signal. When the recording is restricted, the reproducing apparatus reproduces the digital video signal and, when outputting the digital video signal as an analog video signal, partially inverts the phase of a burst signal in the analog video signal.
The control signal instructs to generate a recording restriction signal in which lines in which the phase of the burst signal is partially inverted are arranged every other line or plural lines. As described above, since the recording restriction signal for copy protection is formed by the macroblock in which the line including the inverted burst signal is intermittently arranged, the inverted burst signal is not drawn in the television monitor having a narrow APC frequency response range. In a VCR having a wide frequency response range, it can be drawn. Therefore, there is an effect that image disturbance is caused on the VCR and image disturbance is not caused on the television monitor.

Further, according to the present invention, a copy protection signal is generated by a macroblock in which a line on which a burst correction signal whose amplitude is increased with respect to a normal burst signal is arranged together with a line including an inverted burst signal. Since it is formed, there is an effect that it is possible to correct a change such as color density due to the influence of the inverted burst signal in the television monitor.

Further, according to the present invention, since the line including the inverted burst signal is arranged over the entire screen, there is an effect that the image disturbance to the television monitor can be made inconspicuous. This also has the effect of reducing image disturbance due to flicker.

According to the present invention, since the block of the copy protection signal formed by a plurality of macroblocks is arranged at the same position for each field, there is an effect that image disturbance due to flicker can be reduced.

According to the present invention, the burst correction signal can be used to correct a change in color density or the like in a television monitor caused by inserting an inverted burst signal. Even if the arrangement position of the block of the prevention signal is different for each field, there is an effect that flicker hardly occurs.

[Brief description of the 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 a case where a reproduced analog signal of a DVD player is recorded.

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

FIG. 4 is a waveform chart showing an example of a copy protection signal.

FIG. 5 is a schematic diagram illustrating an example of a macroblock of a copy protection signal.

FIG. 6 is a block diagram illustrating an example of a configuration of an APC circuit.

FIG. 7 is a schematic diagram illustrating an example of a frequency response characteristic of a PLL that manages an APC circuit;

FIG. 8 is a schematic diagram for explaining a repetition frequency based on an inverted burst signal.

FIG. 9 is a schematic diagram illustrating an example of a screen configuration in which blocks of a copy protection signal are arranged.

FIG. 10 is a schematic diagram used for explaining an example of a CGMS and a trigger bit instructing generation of a copy restriction signal.

FIG. 11 shows C used in a digital VCR.
FIG. 3 is a schematic diagram used for describing an example of a GMS recording method.

FIG. 12 shows C used in a digital VCR.
FIG. 3 is a schematic diagram used for describing an example of a GMS recording method.

FIG. 13 is a waveform chart for explaining the AGC pulse method. FIG. 14 is a waveform diagram showing that the width of a copy protection signal has increased after reproduction.

FIG. 14 is a schematic diagram for explaining a color stripe method.

FIG. 15 is a waveform chart showing a burst signal in an original signal and a signal after reproduction.

FIG. 16 is a waveform diagram showing an example of a copy protection signal proposed earlier.

FIG. 17 is a waveform chart showing an example of a copy protection signal proposed earlier.

[Explanation of symbols]

6 ... DVD, 14 ... Output section for outputting reproduced analog video signal, 16, 16Y, 16C ... Output terminal, 24 ... Adder, 26, 27 ... Switcher, 31 ..Signal generators for generating normal burst signals, 32 ... Signal generators for generating burst signals including inverted burst signals, 33 ... Signal generators for generating burst correction signals

   ────────────────────────────────────────────────── ─── Continuation of front page    F-term (reference) 5C053 FA13 FA21 FA23 GB05 JA30                       KA07                 5C055 AA01 AA03 CA15 DA01 EA08                       FA05 GA39 HA08                 5D044 AB07 BC01 BC04 CC03 CC04                       DE50 DE53 EF05 FG18 GK12                       HL08

Claims (12)

[Claims] 1. A video signal reproduction apparatus or video signal reproduction apparatus for detecting a state of a control signal provided on a recording medium and generating a recording restriction signal for restricting recording of an analog video signal based on the detected output. A recording medium for supporting the method, wherein the recording medium is a pack for storing a control signal for instructing whether to generate a recording restriction signal for restricting recording of an aspect of an analog video signal to the pack. In the case where the recording of the aspect of the analog video signal is restricted, when the reproducing apparatus reproduces the digital video signal and outputs the digital video signal as an analog video signal, the digital video signal is recorded in the analog video signal for recording restriction. The color burst signal is partially inverted in phase, and the lines in which the color burst signal is That generates a recording restriction signal is arranged, a recording medium, characterized in that said control signal instructs. 2. A video signal reproducing apparatus or video signal reproducing apparatus for detecting a state of a control signal provided on a recording medium and generating a recording restriction signal for restricting recording of an aspect of an analog video signal based on the detected output. A recording medium for supporting the method, wherein the recording medium includes a control signal for instructing whether to generate a recording restriction signal for restricting recording of an aspect of an analog video signal for a header added to a sector. It has a sector structure for storing, in the case where the recording of the aspect of the analog video signal is restricted, when the reproducing apparatus reproduces the digital video signal and outputs it as an analog video signal, for recording restriction, The phase of the color burst signal in the analog video signal is partially inverted, and the line in which the color burst signal is partially inverted is Recording medium, characterized in that the generating the recording restriction signal is arranged in a plurality of lines every said control signal instructs the. 3. The recording medium according to claim 1, wherein a line in which the amplitude of the color burst signal is different from a normal amplitude is a line other than a line in which the phase of the color burst signal is partially inverted. A recording medium, wherein the control signal instructs to generate a recording restriction signal further arranged on one or more lines. 4. The recording medium according to claim 1, wherein a normal color burst signal is further arranged on one or more lines other than a line in which the phase of the color burst signal is partially inverted. To cause
A recording medium, wherein the control signal indicates. 5. The recording medium according to claim 1, wherein the control includes generating a recording restriction signal in which a line obtained by partially inverting the phase of the color burst signal is arranged in a continuous field. A recording medium characterized by a signal. 6. The recording medium according to claim 1, wherein the generation of a recording restriction signal in which lines in which the phase of the color burst signal is partially inverted is intermittently arranged every several fields. A recording medium characterized by a control signal. 7. The recording medium according to claim 1, wherein a macroblock of a copy protection signal is constituted by lines obtained by partially inverting the phase of the color burst signal arranged every other line or a plurality of lines. A recording medium characterized in that one or more of the macroblocks constitute a block of a copy protection signal. 8. The recording medium according to claim 7, wherein the line other than the block is a line including a normal color burst signal. 9. The recording medium according to claim 7, wherein only the blocks are arranged on a main part of a screen. 10. The recording medium according to claim 7, wherein said blocks are arranged at the same position between fields in a main part of a screen. 11. The recording medium according to claim 7, wherein said blocks are arranged at alternate positions between fields in a main part of a screen. 12. The recording medium according to claim 7, wherein said blocks are moved and arranged for each field in a main part of a screen.