JP3918775B2 - Video signal processing apparatus and video signal processing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a video signal processing apparatus and a video signal processing method applied to record an analog video signal from a video disk, a digital VCR, a digital broadcast receiving apparatus or the like.
[0002]
[Prior art]
With the development of digital technology, high-quality video signal sources are easily available even at home. For example, not only pre-recorded tapes (soft tapes) but also digital broadcasting terminals, DVDs (digital video discs), etc. provide users with high-quality video signals. Digital VCRs (video cassette tape recorders) are also gradually becoming popular for home use, but at present, analog VCRs have become very popular. As a provider of high-quality video signals as described above, a great deal of attention must be paid to copy restrictions by analog VCRs from the standpoint of copyright protection.
[0003]
Several methods of copy restriction have already been considered for analog VCRs. For example, AGC pulse method and color stripe method by Macrovision are known. In the case of copy prohibition, the AGC pulse method is to perform restriction by inserting a pulse having a level larger than the normal AGC reference level in the AGC reference level detection section of the video signal. That is, a pseudo SYNC pulse is inserted in a part of the V (vertical) blanking period of the video signal. 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 level p to the horizontal sync pulse. The level p is changed and inserted.
[0004]
In analog VCRs (household analog VCRs), there are many models in which AGC is applied using a 1H horizontal synchronizing pulse in the V blanking period shown in FIG. 13C. Therefore, when a pseudo sync pulse having an amplitude larger than that of the horizontal sync pulse is inserted into 1H in this way, the AGC circuit determines the amplitude of the pseudo sync pulse as a reference level and applies AGC. 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. On the other hand, since the television monitor is different in the AGC system, it is possible to display a reproduced image normally.
[0005]
[Problems to be solved by the invention]
However, this AGC pulse method has a problem that it is not effective for some video cassette recorders. For example, the β type VCR, the 8 mm VCR, and the VHS type have no effect on those having a long AGC time constant.
[0006]
Therefore, a color stripe method described below has been proposed as another copy restriction method. This color stripe method is a method of inverting the phase of the entire color burst signal (hereinafter, referred to as a burst signal as appropriate), for example, for 4 lines every 21 lines with respect to the reproduced video signal. When the reproduced video signal with the phase of the burst signal inverted in this way is recorded by another home analog VCR, the analog VCR APC (automatic phase control circuit) uses the inverted burst signal as the original burst signal. Since it is used, the color of the line is inverted and recorded / reproduced. Therefore, when this recorded video signal is reproduced, as shown in FIG. 14, a color-inverted band is displayed on the screen every 21 lines.
[0007]
On the other hand, in a general television receiver, the time constant of a PLL (APC) that forms a carrier wave for color signal demodulation is long, so even if a burst signal is inverted continuously in at most four lines, there is an effect. Absent. However, depending on the model, a PLL with a short time constant may be used. In this case, there is a problem in that a band with a reversed color is generated on the screen.
[0008]
Further, the applicant of the present application has proposed a copy restriction method in which the phase of a part of the burst signal of all lines in the effective screen is inverted. This method has an advantage that such a problem does not occur even in a television monitor in which the image quality of a display image deteriorates in the above-described color stripe method.
[0009]
In an analog VCR for home use, a color subcarrier having a frequency of 3.58 MHz (in the case of the NTSC system) is low-frequency converted to a low-frequency converted color 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 the magnetic tape. As described above, in the analog VCR for home use, the color signal is band-limited very narrowly compared with a television receiver or the like, and is recorded on the magnetic tape.
[0010]
Therefore, when a burst signal included in a recorded video signal is reproduced, it has a property of being expanded before and after on the time axis as compared with the original signal before recording due to band limitation. FIG. 15 shows a burst signal in the original signal and the signal after reproduction by the VCR. When the original signal a of the burst signal arranged after the horizontal synchronizing signal h shown in FIG. 15A is recorded and reproduced on the magnetic tape, the burst signal a is expanded back and forth on the time axis as shown in FIG. 15B. Burst signal a ′. .
[0011]
A method of inverting the phase of a part of the burst signal is to make use of this property to prevent copy. FIG. 16 shows an application example of this method. In a normal line, for example, 10 burst signals are arranged after the horizontal synchronizing signal h (FIG. 16A). On the other hand, in order to cause image interference for copy protection, a total of 13 burst signals including inverted burst signals, including 6 burst signals whose phases are inverted and 7 burst signals of normal phase. Is provided as a copy prevention signal (FIG. 16B). On the screen, for example, 17 normal lines and 4 lines including an inverted burst signal are repeated in a convenient 21-line cycle on the screen (FIG. 16C).
[0012]
As described above, when a video signal including a line including an inverted burst signal is reproduced by, for example, a VCR, the PLL cannot follow in the color synchronization circuit of the VCR, causing image deterioration, thereby preventing copying. be able to. Of course, even when this video signal is recorded / reproduced by another VCR, 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 as a substantially normal screen on the television monitor.
[0013]
However, since this method utilizes the fact that the frequency band of the color signal of the VCR is narrow, the copy prevention effect is insufficient for an analog VCR having a wide band of the color signal, for example, S-VHS. There was a problem.
[0014]
As a countermeasure, a method of increasing the wave number of the inverted burst signal can be considered in order to increase the copy prevention effect. 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. Although this method can produce a copy protection effect even with a VCR having a wide color signal band, there is a problem in that it causes significant image interference to some television monitors. For example, although color inversion does not occur, there may be image interference such as interference with different density in a striped manner in the horizontal line direction or change in color density of the entire screen.
[0015]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a video signal processing apparatus and a video signal processing method in which recording restriction is performed so that there is little interference with respect to display on a television monitor and a copy prevention effect can be ensured. There is to do.
[0016]
[Means for Solving the Problems]
The present invention, in order to solve the above problems, a video signal processing apparatus for restricting recording of the video signal recording apparatus of analog video signals,
A first means for arranging a line obtained by partially inverting the phase of the color burst signal in the video signal from the video signal source, every other line;
Second means for inserting a pseudo sync pulse into a part of a vertical blanking period of the video signal from the video signal source ,
An output analog video signal including a video signal processed by the first and second means, a video signal processing apparatus, characterized in that said video signal recording apparatus is to not be recorded normally.
[0017]
Further, the invention provides a video signal processing method for restricting a recording of the video signal recording apparatus of analog video signals,
A first step of arranging lines in which the phase of the color burst signal is partially inverted in every one or a plurality of lines in a video signal from a video signal source ;
Inserting a pseudo sync pulse into a portion of the vertical blanking period of the video signal from the video signal source ;
An output analog video signal including a video signal processed by the first and second step, a video signal processing method characterized in that said video signal recording apparatus is to not be recorded normally.
[0018]
Lines obtained by partially inverting the phase of the burst signal with respect to the reproduced video signal are arranged every other line or a plurality of lines, and a pseudo synchronization pulse is inserted in a part of the vertical blanking period. This burst signal whose phase is partially inverted can cause image interference and prevent copy. In addition, since this signal is arranged every one or more lines, the television monitor does not cause image interference, and can only cause image interference when the signal recorded on the video tape is reproduced. . Further, since a pseudo synchronization pulse is inserted, copy protection can be reliably performed.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described. In order to facilitate understanding of the present invention, an application example of 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 the analog VCR 1. When the cassette tape reproduced by the digital VCR 2 is, for example, a pre-recorded tape, and the control information (referred to as CGMS (Copy Generation Management System)) related to the copy generation restriction recorded in the tape instructs copy prohibition Then, it is necessary to prohibit recording by the analog VCR1.
[0020]
FIG. 1B shows an example in which a playback analog video signal from the DVD player 3 is recorded by the analog VCR 1. Even in this case, when the copy prohibition is instructed by the CGMS recorded on the DVD, the recording by the analog VCR 1 needs to be prohibited. Further, FIG. 1C is an example in which a program received by an IRD (Integrated Receiver Decoder) (or set top box) 4 for receiving a digital broadcast is recorded by a digital VCR 5 and the recorded contents are recorded by an analog VCR 1. . In general, it is often permitted that the digital VCR 5 records a digital broadcast program as a digital signal or an analog signal once. However, copying the recorded content 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.
[0021]
In the case illustrated in FIG. 1, the present invention prohibits copying by the analog VCR 1 and enables the monitor device to display the analog video signals from the digital VCR 2, the DVD player 3, and the digital VCR 5 without any trouble. Is. 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.
[0022]
A digital signal compressed and encoded by MPEG or the like is read from the DVD 6 by the optical pickup 7. A reproduction signal from the optical pickup 7 is supplied to an error processing circuit 9 via a preamplifier, a waveform shaping / 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 the demultiplexer 10. The demultiplexer 10 separates video data, audio data, and control digital data from the reproduction signal.
[0023]
The video data is supplied to the video decoder 11. The video decoder 11 performs processing such as compression encoding decoding and conversion to an analog video signal, and supplies the analog video signal to the output unit 14. The output unit 14 is one to which the present invention is applied, and details thereof will be described later. An analog video signal to which a copy prevention signal is selectively added is output from the output unit 14 to the output terminal 16. The audio data is subjected to processing such as compression encoding decoding and conversion to an analog audio signal in the audio decoder 12, 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. CGMS is included in the control digital data, and a copy control signal is formed based on the CGMS. A copy control signal is supplied to the output unit 14. The output unit 14 is provided inside the DVD player.
[0024]
An example of the configuration 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 an analog component signal, for example. Luminance signals (including synchronization signals) Y and color difference signals RY and BY are supplied to input terminals indicated by 21, 22, and 23, respectively. The luminance signal Y is taken out through the adder 24 to the output terminal 16Y. The color difference signal is supplied to the color encoder 25, and a carrier color signal (including a burst signal) subjected to quadrature two-phase modulation by the color encoder 25 is formed. A 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 the burst signal. The output of the switcher 26 is taken out to the output terminal 16C.
[0025]
In one embodiment of the present invention, in order to 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 set to a normal value. A system is used in which a burst correction signal larger than the one is inserted instead of the burst signal. These copy prevention signal and burst correction signal are inserted at the same timing as the normal burst signal. Further, in the embodiment of the present invention, the above-described AGC pulse system is also used.
[0026]
The adder 24 is supplied with the AGC pulse from the AGC pulse generator 28, and this AGC pulse is added to the luminance signal Y. As the AGC pulse, the AGC pulse generator 28 generates one of a normal level and a large level for copy prohibition. The selection is made by a copy control signal supplied to the input terminal 36 from the data decoder 13 (see FIG. 2).
[0027]
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 the output of the timing controller 35. That is, when copy permission is instructed by the copy control signal, 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 burst signal period, and the burst signal is replaced. Therefore, when video signals taken out to the output terminals 16Y and 16C are recorded by the analog VCR, recording can be prohibited. As described above, since the mode of control of the switcher 26 is different corresponding to the permission / prohibition of copying, the timing controller 35 is supplied with the synchronization signal separated by the synchronization separation circuit 34 and the copy control signal from the input terminal 36. The
[0028]
The normal burst signal SB1 generated by the signal generator 31 is supplied to the input terminal d 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 c 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.
[0029]
FIG. 4 shows an example of waveforms of these signals SB1, SB2, and SB3. FIG. 4A shows an example of a normal burst signal SB1. In this example, the signal SB1 consists of 10 waves. In the burst signal SB2 including the inverted burst signal shown in FIG. 4B, 3 waves are added before the 10 waves of the signal SB1, and the first 10 waves including the added 3 waves are added to the normal burst signal. The phase is reversed. 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 increased by 5 dB with respect to the signal SB1.
[0030]
Although not shown, the normal frequency burst signal SB1 generated by the signal generator 31 has a certain phase relationship with the color subcarrier signal used in the color encoder 25 in the same manner as the normal burst signal. Have Therefore, without providing the signal generator 31, the burst signal may be replaced only by the line to which the burst signal SB2 including the inverted burst signal and the burst correction signal SB3 are added. In the configuration of FIG. 3, the luminance signal Y includes a synchronization signal, and the color encoder 25 generates a burst signal. However, a circuit for generating the synchronization signal and the burst signal is provided, and the generated synchronization signal and burst signal are generated. May be added to the luminance signal and the carrier color signal, respectively.
[0031]
FIG. 5 shows an example of the 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 video signal is arranged in units of five horizontal lines, and these five lines are used as a macroblock (minimum configuration unit) of the copy prevention signal. Among these five lines, the first line ([5n + 0] line) and the [5n + 2] line are provided with a burst correction signal added. Lines including an inverted burst signal are arranged on the [5n + 1] line and the [5n + 3] line. Further, a line in which a normal burst signal is added to the [5n + 4] line is arranged.
[0032]
As described above, in this embodiment, the line including the inverted burst signal and the line provided with the burst correction signal are alternately arranged to form a macroblock for the copy prevention signal. In this example, a copy prevention signal block is formed by a plurality of, for example, 8 macroblocks.
[0033]
The influence on the television monitor and VCR when a line including an inverted burst signal and a line provided with 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 (here, a chroma signal is extracted and used as an input chroma signal) is supplied to the color demodulation circuit 30 and also to the burst extraction circuit 31. The burst signal extracted from the input chroma signal in the burst extraction circuit 31 is supplied to the phase detection circuit 32. In this example, the phase detection circuit 32 uses a multiplier type capable of detecting information in the amplitude direction of the signal.
[0034]
The phase detection circuit 32 is also supplied with a reference subcarrier signal from a VXO (voltage controlled oscillation circuit) 34, the phase comparison of the reference subcarrier signal and the burst signal is performed, and the burst signal is phase detected. The burst signal detected by the phase detection circuit 32 is supplied to the VXO 34 via the low-pass filter 33, and the VXO 34 generates a reference subcarrier signal that is phase-locked to the phase of the burst signal. The phase detection circuit 32, the low-pass filter 33, and the VXO 34 constitute a PLL that is phase-locked to the burst signal. In this way, the reference subcarrier signal generated by the VXO 34 is supplied to the color demodulation circuit 30 to perform color demodulation of the chroma signal.
[0035]
The frequency response characteristic of the APC of this television monitor indicates a characteristic as a low-pass filter, that is, an integral characteristic, as shown by a solid line in FIG. The APC characteristic in the VCR has an integral characteristic as well, but this has a wider band than the television monitor, as indicated by the broken line in FIG.
[0036]
The burst signal arrives intermittently with the period of the horizontal synchronization signal. In the above APC circuit, only the intermittently arriving burst signal is extracted to generate a reference subcarrier. FIG. 8 schematically shows this state. When only the burst signal is extracted, a repetition frequency is formed between the line including the inverted burst signal and the normal line.
[0037]
In the method in which four lines including the inverted burst signal are continuously arranged as described in the reference example previously proposed (FIG. 8A), the repetition frequency in units of lines by the inverted burst signal is For example, as shown by f1 in FIG. 7, it is within the frequency response range of APC in the television monitor. Therefore, APC is drawn into the phase of the inverted burst signal, and the image is disturbed.
[0038]
Therefore, as shown in the present invention, by repeatedly arranging lines including the inverted burst signal at intervals of one line, as shown in FIG. 8B, the repetition frequency per line by the inverted burst signal is increased. Can do. Therefore, this repetition frequency can be outside the frequency response range of the APC of the television monitor and within the frequency response range of the APC of the VCR, for example, as shown by f2 in FIG. Therefore, according to this method, in the television monitor, since the PLL does not draw in the inverted burst signal, no image interference occurs. However, in the VCR, the PLL generates color inversion in response to the inverted burst signal, and the inverted burst signal. It is possible to cause image interference due to the signal.
[0039]
However, depending on the television monitor, the frequency response range of the PLL is wider than the above-mentioned assumption, and image disturbance may occur even when the inverted burst signal is intermittently arranged at intervals of one line. In this case, for example, even if color reversal does not occur, it appears as an obstruction that the color density changes.
[0040]
In order to correct this image interference, in this embodiment, a line provided with the above-described burst correction signal is further arranged. The correction of the image interference by the burst correction signal is effective when the phase detection circuit 32 of the APC is a multiplier type that can also detect information on 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 of the amplitude direction is detected by the phase detection circuit 32, so that the wave number of the burst signal and the signal level can be converted. The
[0041]
In this embodiment, among the lines constituting the macroblock of the copy prevention signal, the line where the burst signal is arranged with a signal other than the normal burst signal includes two lines including the inverted burst signal and the burst correction signal. There are 4 lines in total including 2 lines. In these four lines, there are originally burst signals of 10 [waves] × 4 [lines] = 40 [waves]. On the other hand, in this macro structure, an inverted burst signal of 7 [waves] × 2 [lines] = 14 [waves] exists with respect to the original burst signal position, and a burst signal having a normal phase is a burst signal. There are only 26 waves including the correction signal.
[0042]
Therefore, 14 waves of the inverted burst signal are canceled, and 20 waves of 2 lines that do not include the inverted burst signal out of the 26 burst signals having a normal phase are corrected to correct the 40 burst waves of the normal burst signal. Make an effect. Therefore, in these two lines, the amplitude of the normal burst signal is increased based on x satisfying 20 [wave] × x + 6 [wave] to 40 [wave]. In this example, by setting x to 1.78 representing an increase of 5 dB, 20 [wave] × 1.78 + 6 [wave] ≈41 [wave], which satisfies the condition. That is, the amplitude of the normal burst signal is +5 dB in these two lines, and a burst correction signal is formed.
[0043]
If the phase detection circuit 32 in which information in the amplitude direction of the signal is not detected is used, this correction effect cannot be obtained because the amplitude component is not originally used. However, the burst correction signal does not cause interference. That is, since this burst correction signal also has the same phase as the regular burst signal, it can play the same role as the original burst signal.
[0044]
In the above-described macroblock of the copy prevention signal, the line including the inverted burst signal and the line provided with the burst correction signal are alternately arranged by two lines, and the line provided with the normal burst signal is further provided. Although it is set as the structure of 5 lines arrange | positioned, this is not limited to this example. That is, this macro structure may have another configuration as long as the line including the inverted burst signal is intermittently arranged every other line.
[0045]
For example, one set of two lines including one line on which a burst correction signal is arranged and one line including an inverted burst signal may be a macro structure. Further, a set of two lines, that is, one line where a normal burst signal is arranged and one line including an inverted burst signal may be a macro structure. Further, in the above-described macro structure composed of five lines, the line on which the burst correction signal is arranged may be replaced with the line on which the normal burst signal is arranged.
[0046]
By arranging the copy prevention signal having such a macroblock structure on the screen by a predetermined method, image interference is actually caused on the screen, and a copy prevention effect can be obtained.
[0047]
FIG. 9 shows an example of a method of arranging a copy prevention signal using such a macroblock and another example. FIG. 9A is an example in which blocks of a copy prevention signal and blocks having a normal burst signal not including the copy prevention block are alternately arranged. In this example, the block of the copy prevention signal is composed of 8 macroblocks, that is, 40 lines (portions indicated by diagonal lines in the figure), and the normal burst signal does not include this copy prevention block and the copy prevention signal. Are alternately arranged. Of course, the number of lines of 40 in this case is an example, and the present invention is not limited to this example.
[0048]
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 prevention signal for the main part of the screen as a whole, the copy prevention signal causes image interference such as a change in color density on the television monitor. Even if it occurs, this disturbance can be made inconspicuous.
[0049]
Further, in the example described above, the copy prevention signal is arranged for continuous fields. This is not limited to this example, and copy prevention signals may be intermittently arranged every several fields.
[0050]
In the example shown in FIG. 9A described above, if the block of the copy prevention signal is arranged at the same position for each field, flicker can be reduced. It is also possible to alternately arrange the block of the copy prevention signal and the block of the regular burst signal for each field. Further, the block of the copy prevention signal may be moved for each field.
[0051]
FIG. 10A shows an example of CGMS recorded in advance accompanying the 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 copying in CGMS defines only digital copy restriction, a flag indicating whether or not analog copying is possible, that is, a trigger bit for instructing generation of an analog copy restriction signal may be separately defined. FIG. 10B shows an example thereof. If the trigger bit is “00”, it is instructed not to generate an analog copy restriction signal. If this bit is “01”, the AGC pulse of the analog copy restriction signal is displayed. It is instructed to generate only the AGC signal according to the method. If this bit is '11', it is instructed to generate an AGC signal and a first copy prevention signal to which the present invention is applied. The first copy prevention signal is, for example, a block in which the macro blocks shown in FIG. 5 are arranged as shown in FIG. 9A. Although bit '10' may be unused, as shown in FIG. 10B, the first copy prevention signal and the second copy prevention signal having a different arrangement are generated together with the AGC signal. Can be instructed. In this case, analog copy restriction information is constituted by a total of 4 bits of CGMS and trigger bits.
[0053]
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. Absent. That is, by supplying corresponding trigger bits from the data decoder 13 shown in FIG. 1, 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 independent. Can be controlled.
[0054]
Various forms of actually recording such copy restriction information on a recording medium are possible. In the case of a digital VCR, the data structure shown in FIGS. 11 and 12 is adopted. FIG. 11 shows the structure of VAUX (video auxiliary data), which is a pack having a pack header of (01100001) (61h) (h represents hexadecimal display).
[0055]
In this pack, CGMS is recorded as the upper 2 bits of PC1. The definition of CGMS is the same as that shown in FIG. 10A, for example. 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 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) related to an audio signal in a digital VCR. The header of this pack is (01010001) (51h). In this pack PC1, information related to copy generation restriction is recorded with the same configuration as VAUX. When the CGMS associated with the input video signal is capable of one-generation copying, when the input video signal is recorded, the CGMS on the tape is rewritten to copy prohibition.
[0058]
In the case of a DVD according to an embodiment of the present invention, although not shown, the recording data has a division such as a sector, and a synchronization signal and a header are added to the head of the division. Information for copy restriction is recorded in this header.
[0059]
In the configuration of FIG. 3, the signal generators 31, 32, and 33 are shown as separate blocks, but 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 regular burst signal is generated in the signal generator and an inverted burst signal is added, the phase delay circuit is controlled to invert the phase for a predetermined period, and when the burst correction signal is arranged. Controls the amplifier to amplify a normal burst signal with a predetermined amplification factor. Furthermore, the present invention may add a copy prevention signal to a composite signal format in which a luminance signal and a carrier color signal are superimposed instead of a component signal format.
[0060]
【The invention's effect】
As described above, according to the present invention, since the line containing the inverted burst device signals is formed copy protection signal by a macro block that is intermittently arranged in the frequency response range is narrow the television monitor of the APC An inverted burst signal is not drawn and can be drawn in a VCR with a wide frequency response range. Therefore, there is an effect that image interference is caused to the VCR and image interference is not caused to the television monitor.
[0061]
In addition, according to the present invention, since the line including the inverted burst signal is arranged on the entire screen, it is possible to make the image interference on the television monitor inconspicuous. This also has the effect of reducing image interference due to flicker.
[0062]
Further, according to the present invention, since the block of the copy prevention signal formed by a plurality of macroblocks is arranged at the same position for each field, there is an effect of reducing image interference due to flicker.
[0063]
Also, according to the present invention, since the pseudo synchronization pulse is inserted in a part of the vertical blanking period, the copy prevention effect can be ensured.
[Brief description of the drawings]
FIG. 1 is a block diagram showing several 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 playback 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 diagram showing an example of a copy prevention signal.
FIG. 5 is a schematic diagram illustrating an example of a macroblock of a copy prevention 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 frequency response characteristics of a PLL that publicly manages an APC circuit.
FIG. 8 is a schematic diagram for explaining a repetition frequency by an inverted burst signal.
FIG. 9 is a schematic diagram illustrating an example of a screen configuration on which a block of a copy prevention signal is arranged.
FIG. 10 is a schematic diagram used for explaining an example of CGMS and a trigger bit for instructing generation of a copy restriction signal.
FIG. 11 is a schematic diagram used for explaining an example of a CGMS recording method employed in the digital VCR.
FIG. 12 is a schematic diagram used for explaining an example of a CGMS recording method employed in the digital VCR.
FIG. 13 is a waveform diagram for explaining an AGC pulse method. It is a wave form diagram which shows that the width | variety of the signal for copy prevention increased after reproduction | regeneration.
FIG. 14 is a schematic diagram for explaining a color stripe method;
FIG. 15 is a waveform diagram 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 prevention signal proposed previously.
FIG. 17 is a waveform diagram showing an example of a copy prevention signal proposed previously.
[Explanation of symbols]
6... DVD, 14... Output section for outputting playback analog video signal, 16, 16 Y, 16 C... Output terminal, 24... Adder, 26, 27. ..Signal generator for generating regular burst signal, 32... Signal generator for generating burst signal including inverted burst signal, 33... Signal generator for generating burst correction signal

Claims (2)

A video signal processing apparatus for restricting recording of the video signal recording apparatus of analog video signals,
A first means for arranging a line obtained by partially inverting the phase of the color burst signal in the video signal from the video signal source, every other line;
Second means for inserting a pseudo sync pulse into a part of a vertical blanking period of the video signal from the video signal source ,
An output analog video signal containing the video signal processed by the first and second means, the video signal processing apparatus, characterized in that said video signal recording apparatus is to not be recorded normally. A video signal processing method for restricting a recording of the video signal recording apparatus of analog video signals,
A first step of arranging lines in which the phase of the color burst signal is partially inverted in every one or a plurality of lines in a video signal from a video signal source ;
Inserting a pseudo sync pulse into a part of a vertical blanking period of the video signal from the video signal source ;
Video signal processing method characterized in that the output analog video signal containing the video signal processed by the first and second step, and so the video signal recording apparatus can not be recorded properly.

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