JP2002010206A - Device and method for outputting image signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve copy control of high resolution image signal in analog form. SOLUTION: When a 605 line detecting part 3 detects 605 line in a high resolution image signal, synchronous signal level control part 1 adds or subtracts an additional pulse to or from an upward pulse in ternary synchronous signal in the 605 line to have the signal level different from normal signal level.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal output device and a video signal output method capable of outputting an analog high-definition video signal, and more particularly to a technology for preventing copying of an output analog high-definition video signal.

[0002]

2. Description of the Related Art Hi-vision signals are known as analog high definition video signals. In this Hi-Vision signal, a signal is transmitted using a band compression technique called a MUSE method. However, a so-called baseband signal before modulation by the MUSE method has a signal waveform as shown in FIG. Hereinafter, this baseband signal is referred to as a high vision signal.

[0003] The numbers in the figure indicate the line numbers of the Hi-Vision signal. As is clear from the figure, in the high-definition signal, effective scanning lines (effective lines) are from line 42 to line 557 and from line 604 to line 1119. The picture information is superimposed on the effective scanning line.

[0004] Also, the Hi-Vision signal has a characteristic horizontal synchronizing signal waveform different from the NTSC television signal. As shown at the boundary of each line in FIG. 6, the horizontal synchronizing signal of the HDTV signal is composed of a first falling pulse, a following rising pulse, and a ternary signal composed of a reference zero level. With such a waveform, a phase shift of the horizontal synchronization signal due to transmission system distortion is prevented.

[0005] As a high-definition video signal recording / reproducing apparatus capable of recording and reproducing such a high-definition signal, a video tape recorder is known as disclosed in Japanese Patent Application Laid-Open No. 6-315132. It is commercially available.

On the other hand, recently, digital high-definition video signals have been proposed in addition to analog high-vision signals transmitted by the MUSE system. As an example, there is a so-called 1080i video signal having 1080 effective scanning lines and performing interlaced scanning.

[0007] Such video equipment that handles digital high-definition video signals is expected to be rapidly spread in the future. However, digital high-definition video is used so that it can be connected to conventional analog video equipment. It is expected that not only signals but also analog high-definition video signals can be output. In this case, it is desirable that the synchronizing signal waveform of the output high-definition video signal is the same ternary signal as that of the analog HDTV signal shown in FIG.

[0008] It is well known that copy control is important in a device that handles digital video signals, but it is desirable to be able to perform copy control on high-definition video signals output in an analog format. .

In a conventional analog high-definition video signal recording / reproducing apparatus, 603 in an analog HDTV signal is used.
An identification signal superimposed on a line or a 604 line is detected, and recording is performed by setting an amplitude of a recording signal based on a reference signal included in the line where the identification signal is detected.

Therefore, by changing the reference signal, it is possible to cause the recording operation of the analog high definition video signal recording / reproducing apparatus to malfunction. In other words, the analog high-definition video signal recording / reproducing device controls the amplitude of the recording signal to be large when the level of the reference signal is small, and to decrease the amplitude of the recording signal when the level of the reference signal is large. Therefore, by changing the reference signal, it is possible to change the amplitude of the recording signal and prevent normal recording.

[0011]

As described above, in the case of an analog HDTV signal, the number of effective scanning lines is 42.
Line to 557 line and 604 line to 11
Up to 19 lines. Accordingly, line 603 is outside the effective scanning line, and line 604 is a scanning line that is difficult to be displayed on the monitor even within the effective scanning line. This is not a problem and is a useful technique.

[0012] However, in the case of the 1080i video signal, the effective scanning lines are from 21 lines to 560 lines.
The total is 1080 lines from 584 lines to 1123 lines. Therefore, for a monitor designed to display the video signal of the 1080i system, 603
Alternatively, when a video signal in which the identification signal or the reference signal is superimposed on the 604 line is output, a signal unrelated to the video is displayed on the monitor. For these reasons, in the case of a 1080i video signal, 60
No identification signal or reference signal could be superimposed on line 3 or 604, and copy control could not be realized.

Accordingly, an object of the present invention is to provide a video signal output device capable of outputting an analog high-definition video signal capable of preventing unauthorized copying in an analog high-definition video signal recording / reproducing device.

[0014]

A video signal output device according to the present invention is a video signal output device for outputting an analog high-definition video signal having a ternary synchronization signal. Synchronizing signal level control means for changing a signal level of a pulse, wherein the synchronizing signal level control means changes the signal level of the forward-direction pulse with respect to a normal level only for a predetermined line; Is output.

[0015] Further, the synchronization signal level means of the video signal output device according to the present invention can change the signal level of the positive direction pulse to at least a plurality of different levels with respect to a normal level, The signal level of the positive-direction pulse is changed only for an analog high-definition video signal for which copying is restricted.

[0016] The predetermined line of the video signal output device according to the present invention may be defined as 60 lines in an analog high definition video signal.
It is characterized by five lines.

A video signal output device according to the present invention is a video signal output device for converting a digital video signal into an analog signal and outputting the analog video signal, wherein the digital video signal is a high definition video signal. And a first identification means for identifying whether the digital video signal is a standard definition video signal, and a second identification means for identifying the tolerance of copying the digital video signal. When the digital video signal is identified as a high-definition video signal and copying is prohibited by the means, the signal level of the positive-going pulse constituting the ternary synchronization signal is normalized only for a predetermined line. Output an analog high-definition video signal changed with respect to the level of the digital video signal, the digital video signal is a standard definition video signal, and copying is prohibited. If it is identified, an analog standard definition video signal is output to a predetermined line in the vertical blanking period, to which a copy protection signal for preventing a normal recording operation of the recording apparatus is added.

A video signal output method according to the present invention is a video signal output method for outputting an analog high definition video signal having a ternary synchronization signal, and outputs an analog high definition video signal whose copy is restricted. In this case, an analog high-definition video signal is output in which the signal level of the positive direction pulse constituting the ternary synchronization signal is changed from the normal level only for a predetermined line.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A video signal output device according to the present invention is a video signal output device capable of outputting an analog high-definition video signal, and is applicable to a recording / reproducing device, a set-top box or other video devices. It is possible.

As described above, a high-definition video signal recording / reproducing apparatus capable of recording and reproducing a Hi-Vision signal is disclosed in
A video tape recorder described in Japanese Patent No. 315132 is commercially available, and when an identification signal is detected on 603 lines or 604 lines, the amplitude of the recording signal is corrected according to the reference level of that line. However, if such an identification signal is not detected, the amplitude of the recording signal cannot be adjusted. Therefore, the amplitude is adjusted in accordance with the horizontal synchronization signal level of a specific line.

Therefore, a method is considered in which normal recording is prevented by changing the level of the horizontal synchronizing signal. First, considering a case where the horizontal synchronization signal level of the entire video signal is largely fluctuated, it is expected that the synchronization signal extraction circuit of the monitor malfunctions and the video on the monitor becomes unstable. Therefore, the horizontal synchronizing signal level cannot be largely changed from the original level.

On the other hand, when the variation of the level of the horizontal synchronizing signal is reduced, the influence on the monitor is reduced, but the variation of the amplitude of the recording signal is also small. Is not expected to be obtained. For this reason, varying the horizontal synchronizing signal level of the entire video signal is not effective as a copy protection technique.

Accordingly, in the video signal output device according to the present invention,
A high-definition video signal recording / reproducing device capable of recording / reproducing a high-definition signal makes only a horizontal synchronization signal of a specific line referred to for amplitude adjustment different from an original horizontal synchronization signal so as to realize copy control. did.

FIG. 1 is a diagram showing a horizontal synchronizing signal in a specific line of a high-definition video signal. FIG. 1A shows a state in which an original ternary synchronizing signal is inserted, and FIGS. This shows a state where a synchronization signal different from the original ternary synchronization signal is inserted. As a high-definition video signal recording / reproducing device capable of recording / reproducing a Hi-Vision signal, a device for controlling the amplitude of a recording signal with reference to a horizontal synchronization signal level of 605 lines of the high-definition video signal is commercially available. Therefore, the horizontal synchronization signal of 605 lines is modified here so that copy control can be performed on such a device.

First, the original ternary synchronization signal shown in FIG. In the figure, the black level (0
%) To the white level (100%)
Assuming 00 mV, the level of the first downward pulse of the ternary synchronization signal is -300 mV, and the level of the next upward pulse is +300 mV. Therefore, the amplitude of the difference between the upper and lower pulses is 600 mV. In a high-definition video signal recording / reproducing apparatus capable of recording / reproducing a Hi-Vision signal,
The AGC adjusts the gain of the input signal so that the amplitude of the difference between the upper and lower pulses is constant.

On the other hand, in the waveform shown in FIG. 3B, the level of the upward pulse in the ternary synchronization signal of the 605 line is +7.
00 mV. The AGC receiving this signal receives the level difference between the upper and lower pulses of the ternary synchronization signal, that is, 700-
The gain is adjusted so that (−300) = 1000 mV becomes 600 mV.

Therefore, the output signal of the AGC has an amplitude of 700 mV × (600/1000) from the black level to the white level.
= 420 mV, which is a video signal having an amplitude smaller than the original, and when this is displayed on a receiver, a very dark video is obtained.

In the waveform shown in FIG. 3C, the level of the upward pulse in the ternary synchronization signal of the 605 line is set to +5.
It is 0 mV. The AGC receiving this signal receives the level difference between the upper and lower pulses of the ternary synchronization signal, that is, 50-(-3).
00) = 350 mV is adjusted to 600 mV.

Therefore, the output signal of the AGC has an amplitude from the black level to the white level of 700 mV × (600/350) =
When a video signal with a larger amplitude than 1200 mV is displayed on a receiver, the dark portion becomes abnormally whitish, and the bright portion becomes saturated with the circuit and display in the middle and becomes pure white. Become.

According to the present invention, when illegal copying is performed by a high-definition video signal recording / reproducing apparatus capable of recording / reproducing a Hi-Vision signal, the signal waveforms shown in FIGS. Are alternately repeated at a cycle such as several tens of seconds. According to this method, illegal copying by such a high-definition video signal recording / reproducing device can be prevented, and with regard to a recording / reproducing device to be commercialized in the future, copying will be stopped by detecting this deformed waveform. By designing the AGC to surely respond to this deformed waveform, illegal copying can be prevented. In the above description, the ternary synchronization signal is modified only for the 605 line. However, the synchronization signal of another line or a plurality of lines may be modified as long as the influence on the monitor is not a problem. .

Next, a first embodiment of the video signal output device according to the present invention will be described with reference to FIG. Here, the synchronizing signal level controller 1 is supplied with an analog high definition video signal having a ternary synchronizing signal, and the line counter 2 is supplied with a horizontal synchronizing signal separated and generated from the high definition video signal. Is done.

The line counter 2 is based on a horizontal synchronizing signal,
The number of lines of the horizontal scanning line signal is counted, and 605 lines are detected by the 605 line detector 3. Note that 6
The 05 line detection unit 3 can be configured by a comparator or the like that compares the count value output from the counter 2 with a value that becomes “605” in decimal notation and outputs a pulse when they match.

When the 605 line detection unit 3 outputs a pulse, the synchronization signal level control unit 1 has the same timing as the original upward pulse of the ternary synchronization signal and an upward pulse having a different signal level (hereinafter, additional pulse). A pulse). This additional pulse is output from the line counter 2
May be supplied to the synchronization signal level control unit 1 and generated in the synchronization signal level control unit 1, but may be generated by another method.

[0034] The synchronization signal level control unit 1
By adding or subtracting an additional pulse to the upward pulse of the value synchronization signal, the synchronization signal waveform shown in FIG. 1B or 1C is generated and output. In FIGS. 1B and 1C, the level of the upward pulse is set to +700 mV and +50 mV. However, by adjusting the amplitude of the additional pulse before adding or subtracting, the level is appropriately set to another level. It is possible.

When additional data is added to an incoming high-definition video signal and copy control information is contained therein, it is determined whether or not copying is possible based on the copy control information. Can be. Then, when copying is permitted without limitation, the signal is output with a regular ternary synchronization signal without performing the addition / subtraction of the additional pulse described above, and when copying is restricted in some way (copying prohibited or limited number of times) Only copying is possible), by outputting a deformed waveform synchronizing signal by the above-mentioned method, it is possible to prevent illegal copying of analog-type high-definition video signals including recording and playback devices that have already been commercialized. it can.

As described above, when the level of the upward pulse is changed every several tens of seconds, a clock signal is counted by a counter (not shown), and the switching pulse switches between a high level and a low level every tens of seconds. May be created and the level of the pulse to be added or subtracted may be changed, or the direction of the pulse may be inverted.

A signal representing a reference timing of a line when a horizontal synchronizing signal is added to a video signal obtained by decoding a compressed digital video signal without supplying a horizontal synchronizing signal to the line counter 2, for example. May be supplied.
In such a case, the synchronization signal level controller 1 may separate the horizontal synchronization signal from the high-definition video signal and generate an additional pulse.

Next, a video signal output device according to a second embodiment of the present invention will be described with reference to FIG. In the video signal output device shown in FIG. 3, a digital video signal reproduced from a recording / reproduction device or a digital video signal received by a set-top box is subjected to processing such as compression decoding, and then D / A converted to analog. It is assumed that the signal is output as a video signal.

Here, the digital video signal includes a high-definition video signal and a standard-definition video signal. When the video signal to be output is a high-definition video signal, the waveform is deformed as described above. Copy control is performed by adding and outputting a ternary synchronization signal. If the output video signal is a standard definition video signal, a pseudo synchronization signal is added to a predetermined line in a vertical blanking period and output. This controls copy. Note that the standard definition video signal means a video signal having the same number of scanning lines as the number of scanning lines of an NTSC or PAL television signal used in analog terrestrial broadcasting.

In the video signal output device shown in FIG. 3, the signal format identification unit 10 uses the identification information related to the reproduced digital video signal or the signal format added to the received digital video signal to input the incoming video signal. Is a high definition video signal or a standard definition video signal. In addition, information relating to copy control is also added to the incoming video signal, and the signal system identification unit 1
0 controls the operation of the synchronization signal insertion unit 12 based on the information on the copy control.

Since the incoming digital video signal is encoded by a compression encoding method such as the MPEG system, the decoder 11 performs a decoding process on the incoming digital video signal. If the incoming video signal is a high-definition video signal, an analog high-definition video signal is output from the component output terminal 21 after the processing described below, and the incoming video signal is converted to a standard definition video signal. If the video signal is a high-definition video signal, a standard definition video signal of the analog system is output from the Y / C separation output terminal 22 after the processing described later, and a standard definition video signal of the analog system is output from the composite output terminal 23. Is output.

First, the case where the incoming video signal is a high-definition video signal will be described. The decoder 11 outputs the luminance signal (Y) to the synchronizing signal insertion unit 12 and outputs the color difference signal (Pr) to the D signal. And outputs the color difference signal (Pb) to the D / A converter 16. At this time, the color difference signals (Pr and Pb) are output to the quadrature two-phase modulator 13.
However, since the operation of the quadrature two-phase modulator 13 is stopped, no signal is output from the quadrature two-phase modulator 13.

Then, when the incoming digital video signal is identified as unconditionally permitted for copying by the signal type identifying unit 10, the synchronizing signal inserting unit 12, as shown in FIG. When a normal ternary synchronization signal is added and output, and the signal system recognition unit 10 determines that copying is prohibited or is permitted only for a finite number of times, FIG. ) Or (c), a modified sync signal is added as a horizontal sync signal of 605 lines and output.

As described above, the luminance signal to which the regular ternary synchronization signal or the modified synchronization signal has been added is converted into the D / A converter 1
At 4 the signal is converted to an analog signal. Similarly, the color difference signals (Pr and Pb) are converted into analog signals by the D / A converters 15 and 16, respectively, and each analog signal is output from the component output terminal 21 as an analog high definition video signal. You.

At this time, the D / A conversion units 17 and 18 provide the D / A
Since the signal obtained by inverting the operation control signal output from the signal type identification unit 10 by the inversion circuit 19 is supplied to the A conversion units 14 to 16, the D / A conversion units 17 and 18 do not operate, and the Y / No signal is output from the C separation output terminal 22 and the composite output terminal 23. D / A converter 1
Clocks at the clock rate of the high-definition video signal are supplied to 4 to 16 to convert digital signals into analog signals.

Next, the case where the incoming video signal is a standard definition video signal will be described. The decoder 11 outputs the luminance signal (Y) to the synchronizing signal insertion unit 12, and outputs the color difference signals (Cr and Cb). ) To the quadrature two-phase modulator 13. In this case, the color difference signal (Cr) is converted by the D / A converter 1
5 and the color difference signal (Pb) is output to the D / A converter 16.
However, since the D / A converters 14 to 16 are controlled to stop their operations based on the operation control signal from the signal type identification unit 10, a signal is output from the component output terminal 21. Not done.

When the incoming digital video signal is identified as unconditionally permitted for copying by the signal type identification unit 10, the synchronization signal insertion unit 12 outputs a normal synchronization signal in the standard definition video signal. ("Broadcasting technology""July 1987
P-147 in the “Monthly Issue”, RS- shown in FIG.
170A standard synchronization signal) and output.

On the other hand, if the incoming digital video signal is identified by the signal type identification unit 10 as copying prohibited or permitted only for a finite number of times, it is disclosed in Japanese Patent No. 2881432. As shown as an output of the modulator 12 in FIG. 3 of the publication, a pseudo-sync signal (hereinafter referred to as M) comprising a plurality of pairs of a pseudo-sync pulse and a white pulse.
A signal is inserted into a plurality of predetermined lines during the vertical blanking period. Note that the MV signal is a signal that causes the AGC of the recording system of the recording / reproducing apparatus to malfunction, and when a video signal to which the MV signal is added is recorded, the amplitude of the recording signal changes and normal recording is performed. Can not.

[0049] Then, the luminance signal output from the synchronization signal insertion unit 12 is supplied to the D / A conversion unit 17 and converted into an analog signal. As described above, since the D / A converters 14 to 16 are not operating at that time, no signal is output from the component output terminal 21. Further, the quadrature two-phase modulator 13 generates and outputs a modulated color signal (C) from the color difference signals (Cr and Cb), and the modulated color signal (C) output from the quadrature two-phase modulator 13 is D / A converted. The signal is supplied to the unit 18 and converted into an analog signal. The D / A converters 17 and 18 are supplied with a clock having the clock rate of the standard definition video signal, and convert a digital signal into an analog signal.

As described above, the luminance signal to which the regular synchronization signal or the MV signal of the RS-170A standard is added and the D signal
The modulated color signal output from the A / A converter 18 is converted into a Y / C separated output terminal 2 as an analog standard definition video signal.
2 is output. Further, the luminance signal output from the D / A converter 17 and the modulated color signal output from the D / A converter 18 are added by the adder 20, and output from the composite output terminal 23 as an analog standard definition video signal. Is output.

As described above, when the digital video signal input to the decoder 11 is a high-definition video signal, an analog high-definition video signal is output from the component output terminal 21 and input to the decoder 11. When the digital video signal is a standard definition video signal, an analog high definition video signal is output from the Y / C separation output terminal 22 and the composite output terminal 23. In the case of the above configuration, for example, by detecting a signal at a connection terminal of a monitor connected to these output terminals, it is possible to easily switch between a high definition video signal and a standard definition video signal. Can be.

When the incoming digital video signal is a standard definition video signal, the standard definition video signal is output not only from the Y / C separation output terminal 22 and the composite output terminal 23 but also from the component output terminal 21. May be. In that case, the D / A converters 14 and 16 are operated simultaneously with the D / A converters 17 and 18 without using the inverting circuit 19.

When the incoming digital video signal is a high-definition video signal and the signal cannot be output from the Y / C separation output terminal 22 and the composite output terminal 23, a high-resolution signal is generated by a signal generator (not shown). A video signal for displaying a message indicating that the definition video signal is being output may be generated and output from the Y / C separation output terminal 22 and the composite output terminal 23 as a standard definition video signal.

In the above-described embodiment, an example in which a total of five D / A converters are provided has been described. However, when a digital video signal input to the decoder 11 is a high-definition video signal, a component An analog high-definition video signal is output only from the output terminal 21. When the digital video signal input to the decoder 11 is a standard definition video signal, the Y / C separation output terminal 22 and the composite output terminal 2 are output.
When an analog high-definition video signal is output only from the number 3, the number of D / A conversion units can be reduced to three by using the switching means. That is, D / A
The conversion unit 14 and the D / A conversion unit 17 are shared, and one of the D / A conversion units 15 and 16 is shared with the D / A conversion unit 18, so that a total of three D / A conversion units can be used. Others
There may be modified examples in which the number of D / A conversion units is three for luminance signals and color difference signals irrespective of the types of signals, and processing of quadrature two-phase modulation is performed after conversion to analog signals.

Further, in the embodiment shown in FIG. 3, an example is shown in which copy control is performed by adding a synchronous signal whose waveform of the luminance signal (Y) is deformed. However, the present invention is not limited to this. By adding a deformed synchronization signal,
It goes without saying that copy control may be performed.

Next, the configuration of the synchronization signal insertion unit 12 and the operations of the signal system identification unit 10 and the synchronization signal insertion unit 12 will be described in more detail. FIG. 4 is a diagram for explaining the configuration of the synchronization signal insertion unit 12. The signal system identification unit 10 shown in FIG. 4 can be configured by a microprocessor.

The synchronization signal insertion unit 12 includes a buffer memory 12a for temporarily storing a luminance signal output from the decoder 11, a first memory 12b for storing various synchronization signal waveforms and deformed waveforms, and a first memory 12b. Reading of the synchronization signal waveform and the deformed waveform from the memory 12b, and the buffer memory 1
The second memory 12c in which information on the readout sequence of the luminance signal (picture signal) from 2a is stored, the luminance signal (picture signal) output from the buffer memory 12a and the first memory
And a multiplexer 12d for switching and outputting the output of the memory 12b in a time-division manner.

In the first memory 12b, a synchronization signal waveform of a standard definition video signal (SD signal), a synchronization signal waveform of a standard definition video signal (SD signal) to which an MV signal is added, and a high definition The synchronization signal waveform of the video signal (HD signal) and the synchronization signal waveform of the high-definition video signal (HD signal) obtained by deforming the waveform are stored. Furthermore, not only the waveform of the horizontal synchronization signal in each signal, but also The waveform of the horizontal flyback period including the pedestal level and the waveform of the vertical blanking period are also stored.

Here, as for the synchronizing signal waveform of the standard definition video signal (SD signal) to which the MV signal is added, only a portion different from the synchronizing signal waveform of the standard definition video signal (SD signal) is stored. The capacity can be saved, and with respect to the synchronized signal waveform of the high-definition video signal (HD signal) whose waveform has been deformed, by storing only a portion different from the synchronized signal waveform of the high-definition video signal (HD signal). You can save memory capacity. In the case of repeatedly outputting a plurality of upward pulse waveforms having different levels with respect to a synchronous signal waveform of a high-definition video signal (HD signal) whose waveform has been deformed, information on portions other than the upward pulse should be shared. Saves memory space. Note that the color burst signal waveform is not stored in the first memory 12b because it is added by the quadrature two-phase modulator 13.

The operation of the signaling system identification unit 10 will be described below with reference to FIG. 5. The signaling system identification unit 10 determines whether the incoming digital video signal is a high definition video signal or a standard definition video signal. Is determined (F
101), if the video signal is a high definition video signal, F102
It is determined whether or not the video signal is permitted to be copied indefinitely. If the video signal is a standard definition video signal, F
At 103, it is determined whether or not the video signal is permitted to be copied without restriction.

If the video signal is a high-definition video signal and the copying is permitted without limitation, the memory read sequence A is selected (F104), and the copying is performed without limitation with the high-definition video signal. If the video signal is not the permitted video signal, the memory read sequence B is selected (F105). If the video signal is a standard definition video signal and the video signal is permitted to be copied without restriction, the memory read sequence C is selected. If the selection is made (F106), and the video signal is not the standard definition video signal and the video signal is not permitted to be copied without restriction, the memory read sequence D is selected (F107).

Based on the read sequence information thus selected, a read address from the first memory 12b is set, and a read timing of a luminance signal (picture signal) from the buffer memory 12a is set. A luminance signal to which a synchronization signal waveform or a deformed waveform is added is output.

Here, sequence A is information for outputting a luminance signal in a high-definition video signal to which a regular synchronization signal waveform is added, and sequence B is 605.
FIG. 1 (b) or (c) as a horizontal synchronization signal of a line
Are information for outputting a luminance signal to which a horizontal synchronization signal having a deformed waveform shown by
The sequence D is information for outputting a luminance signal in a standard definition video signal to which a regular synchronization signal waveform is added. The sequence D is a standard definition in which an MV signal is added to a plurality of predetermined lines during a vertical blanking period. This is information for outputting a luminance signal in the video signal.

For example, if the incoming digital video signal is a high-definition video signal and a video signal permitted to be copied without restriction, the sequence A is selected, and the information on the sequence A is stored in the second memory. The data is read out from the memory 12c to a memory area (not shown) of the signal type identification unit (microprocessor) 10.

After that, the signal type identification unit (microprocessor) 10 makes the first memory 12
The respective components are controlled such that the synchronizing signal waveform of the high-definition video signal (HD signal) is read at a predetermined timing from b, and the luminance signal (picture signal) is read at a predetermined timing from the buffer memory 12a. Then, the signal system control unit (microprocessor) 10
By controlling 2d, switching between the output of the first memory 12b and the output of the buffer memory 12a is controlled, and a luminance signal to which a regular synchronizing signal waveform is added is output.

If the incoming digital video signal is not a high-definition video signal and is not a video signal permitted to be copied without restriction, sequence B is selected, and the information on sequence B is stored in the second memory 12c. Is read out to a memory area (not shown) of the signal system identification unit (microprocessor) 10.

After that, the signal mode identification unit (microprocessor) 10 sends the first memory 12
b to the synchronizing signal waveform of the high-definition video signal (HD signal)
Each part is controlled such that the synchronized signal waveform of the high-definition video signal (HD signal) whose waveform has been deformed is read out at a predetermined timing, and the luminance signal (picture signal) is read out at a predetermined timing from the buffer memory 12a. . Then, the signal system control unit (microprocessor) 10 controls the multiplexer 12d to thereby control the first memory 12
b and the output of the buffer memory 12a. In this way, a luminance signal to which the horizontal synchronizing signal having the deformed waveform shown in FIG. 1B or 1C is added as the 605-line horizontal synchronizing signal is output.

Similarly, if the incoming digital video signal is a standard definition video signal and a video signal permitted to be copied without restriction, sequence C is selected and the information on sequence C is stored in the second The data is read from the memory 12c to a memory area (not shown) of the signaling system identification unit (microprocessor) 10.

After that, the signal mode identification unit (microprocessor) 10 sends the first memory 12
The respective components are controlled such that the synchronizing signal waveform of the standard definition video signal (SD signal) is read at a predetermined timing from b, and the luminance signal (picture signal) is read at a predetermined timing from the buffer memory 12a. By controlling the multiplexer 12d, the signal system control unit (microprocessor) 10 controls the switching between the output of the first memory 12b and the output of the buffer memory 12a, and the luminance to which the normal synchronizing signal waveform is added. A signal is output.

Similarly, if the incoming digital video signal is not a standard definition video signal and is not a video signal permitted to be copied without restriction, sequence D is selected, and information on sequence D is stored in the second memory. The data is read out from the memory 12c to a memory area (not shown) of the signal type identification unit (microprocessor) 10.

Thereafter, the signal mode identification unit (microprocessor) 10 sends the first memory 12
b, the synchronization signal waveform of the standard definition video signal (SD signal) and the waveform of the standard definition video signal (SD signal) to which the MV signal is added are read out at a predetermined timing, and the luminance signal (SD signal) is read from the buffer memory 12a. Each part is controlled so that the picture signal is read out at a predetermined timing. Then, the signal system control unit (microprocessor) 10 controls switching between the output of the first memory 12b and the output of the buffer memory 12a by controlling the multiplexer 12d. In this way, a luminance signal with the MV signal added to a predetermined plurality of lines during the vertical blanking period is output.

In the above embodiment, the first memory 1
Although the second memory 2b and the second memory 12c are shown in different configurations, it goes without saying that different areas in one memory may be used. Further, as described above, since the signaling system identification unit 10 is constituted by a microprocessor, it goes without saying that the signaling system identification unit 10 can be shared with a processor that controls a device by receiving a remote control signal, a processor that controls the mechanism of the device, and the like.

[0073]

According to the video signal output apparatus or the video signal output method according to the present invention, when outputting an analog high definition video signal, the synchronization signal is different from the normal synchronization signal level only for a predetermined line. Since the analog high-definition video signal is output as a level, it is possible to prevent normal recording of the recording apparatus that controls the amplitude of the recording signal based on the level of the synchronization signal on the predetermined line.

Further, since only the synchronization signal level of the predetermined line is changed, even when added to, for example, a signal of the 1080i system, there is no adverse effect when displaying this high-definition video signal on a monitor.

Further, according to the video signal output device or the video signal output method according to the present invention, a high definition video signal and a standard definition video signal are identified, and a predetermined signal waveform is added to each of them. Therefore, illegal copying can be effectively prevented both when outputting an analog high definition video signal and when outputting an analog standard definition video signal.

[Brief description of the drawings]

FIG. 1 is a diagram showing a ternary synchronization signal and a modified synchronization signal waveform.

FIG. 2 is a diagram for explaining a first embodiment of the present invention.

FIG. 3 is a diagram for explaining a second embodiment of the present invention.

FIG. 4 is a diagram illustrating a configuration of a synchronization signal insertion unit.

FIG. 5 is a flowchart for explaining operations of a signal type identification unit and a synchronization signal insertion unit;

FIG. 6 is a diagram for explaining a baseband Hi-Vision signal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Synchronization signal level control part 2 ... Line counter 3 ... 605 line detection part 10 ... Signal system identification part 11 ... Decoder 12 ... Synchronization signal insertion part 12a ... Buffer memory 12b ... First memory 12c ... Second memory 12d ... Multiplexer 13: Quadrature two-phase modulator 14 to 18: D / A converter 19: Inverting circuit 20: Adder 21: Component output terminal 22: Y / C separation output terminal 23: Composite output terminal

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) H04N 5/91 DF term (reference) 5C020 AA31 AA37 CA13 CA20 5C025 AA28 BA05 BA11 BA20 BA25 DA01 DA04 DA08 5C053 FA13 FA18 FA20 GA13 GB38 JA27 JA28 KA21 KA22 KA25 KA26 LA07

Claims (5)

[Claims] 1. A video signal output device for outputting an analog high-definition video signal having a ternary synchronization signal, comprising: a synchronization signal level control means for changing a signal level of a positive direction pulse constituting the ternary synchronization signal. The video signal output device, wherein the synchronization signal level control means outputs an analog high definition video signal in which a signal level of the positive direction pulse is changed from a normal level only for a predetermined line. 2. The synchronizing signal level means is capable of changing the signal level of the positive-going pulse to at least a plurality of different levels with respect to a normal level, and the analog high-definition with limited copying. 2. The video signal output device according to claim 1, wherein the signal level of the forward pulse is changed only for the video signal. 3. The video signal output device according to claim 1, wherein the predetermined line is 605 lines in an analog high definition video signal. 4. A video signal output device which converts a digital video signal into an analog signal and outputs the analog video signal, wherein the digital video signal is a high-definition video signal,
Or a first identification means for identifying whether the digital video signal is a standard definition video signal, and a second identification means for identifying a permissible copy of the digital video signal, wherein the first and second identification means If it is determined that the digital video signal is a high-definition video signal and that copying is prohibited, the signal level of the positive-going pulse constituting the ternary synchronization signal is changed to a regular level only for a predetermined line. Outputting an analog high-definition video signal changed with respect to the digital video signal is a standard definition video signal;
If it is determined that copying is prohibited, it is necessary to output an analog standard definition video signal with a copy prevention signal added to a predetermined line in the vertical blanking period to prevent a normal recording operation of the recording apparatus. Characteristic video signal output device. 5. A video signal output method for outputting an analog high-definition video signal having a ternary synchronization signal, wherein when outputting an analog high-definition video signal whose copy is restricted,
A video signal output method comprising: outputting an analog high-definition video signal in which a signal level of a positive-direction pulse forming a ternary synchronization signal is changed from a normal level only for a predetermined line.