JPH06253256A - Video signal output device, video signal recording device and video signal recording medium - Google Patents

Abstract

PURPOSE:To inhibit the copy of a video signal even when a MUSE signal is converted by a MUSE-NTSC converter. CONSTITUTION:Consecutive signals whose frequency ratio is 9/12:3/4:1 and whose frequencies are 2.4MHz, 3.2MHz and 4.3MHz are added to a MUSE signal. The resulting signal is recorded on a video disk 14, and then reproduced and decoded by a MUSE decoder 16, then frequencies of ID signals included in an HD signal are respectively 2.2, 2.9 or 3.9MHz. When a MUSE signal is converted into a video signal of the NTSC system by a MUSE-NTSC converter 53 and the conversion system is the zoom system, the frequencies of the ID signals are 0.8, 1.3 or 1.5MHz. When the conversion system is the wide or squeeze system, the frequencies are 1.3, 1.5 and 2.0MHz.

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, a video signal recording device, and a video signal recording device suitable for recording a video signal of MUSE system or a high-definition video signal obtained by decoding the video signal. Regarding the medium.

[0002]

2. Description of the Related Art Recently, high-definition video images represented by high-definition have been broadcast. This high-definition video image is transmitted via a broadcasting satellite by the MUSE system, and at each home, the MUSE system video signal can be converted and a high-definition image can be viewed.

Since this high-quality video image is relatively expensive, if it is copied onto a magnetic tape, an optical disk or the like, there is a possibility that the damage to the copyright infringement of the program will be great. Therefore, it is desired to add a function of preventing copying to the recording device.

[0004]

Conventionally, in order to prevent copying, for example, as disclosed in Japanese Patent Laid-Open No. 63-107281, an ID indicating whether or not copying is prohibited within a blanking period. I was trying to add a signal. However, the ID signal is deleted in a device of a system in which a signal in the blanking period is replaced with a signal generated in an internal circuit when a video signal is recorded on a recording medium or transmitted to a transmission channel. , There was a problem that could not prohibit copying.

The present invention has been made in view of such a situation, and makes it possible to surely prohibit copying.

[0006]

According to a first aspect of the present invention, there is provided a video signal output device comprising: a Y ID generator 162 as an ID generating means for generating an ID signal for prohibiting copying of a continuous signal having a predetermined frequency. , A switch 170 as an adding means for adding the ID signal generated by the Y ID generator 162 to the video signal, and a switch 170 for adding the ID signal to an effective line displayed on the screen of the video signal. And a Y ID line pulse generator 164 as a control means for controlling.

The Y ID generator 162 includes a frequency dividing circuit 402 as a first continuous signal generating means for generating a continuous signal having a first frequency, and a continuous signal having a second frequency different from the first frequency. A frequency dividing circuit 403 as a second continuous signal generating means, and an adder 4 as an adding means for adding the continuous signal of the first frequency and the continuous signal of the second frequency.
And 05.

The Y ID generator 162 is a frequency dividing circuit 40 as third continuous signal generating means for generating a continuous signal having a third frequency different from the first frequency and the second frequency.
4 can be further provided, and the ratio of the continuous signals of the first to third frequencies can be set to 9/12: 3/4: 1.

A phase control circuit 166 as a phase control means for inverting the phase of a continuous signal for each field or line.
Alternatively, an emphasis circuit 167 can be further provided as an emphasis means for emphasising a continuous signal.

The ID signal can be added to the luminance signal, the chroma signal or both of the video signals. The video signal can be a MUSE signal or a high definition video signal.

The ID signal can be placed in at least two different fields or added to at least two consecutive lines.

Further, the ID signal can be arranged at a position including a range of at least about 3/4 in the center of the line.

A video signal recording apparatus according to a fourteenth aspect uses a window generator 93 as a generating means for generating a window corresponding to a predetermined range in an effective line displayed on the screen of the video signal, and the window. Then, an ID detection circuit 91 and an AND gate 9 as a detection means for detecting an ID signal formed of a continuous signal of a predetermined frequency, which is added to the effective line displayed on the screen of the video signal.
4 and a recording circuit 95 as recording means for prohibiting recording of a video signal corresponding to the output of the AND gate 94.

The ID detection circuit 91 includes a bandpass filter 301 for extracting a continuous signal having a predetermined frequency, and a rectifying circuit 303 for rectifying the output of the bandpass filter 301.
It can be configured by a comparison circuit 305 that compares the output of the rectifier circuit 303 with a predetermined reference value. And, as this band pass filter, rectifier circuit and comparison circuit,
An AND gate 3 is provided as an arithmetic circuit which is provided with two signals corresponding to continuous signals of different frequencies and which calculates the logical product of the outputs of the comparison circuits corresponding to the continuous signals of each frequency.
09 can be further provided.

When the video signal is a signal obtained by decoding the MUSE signal into an NTSC video signal, the window generator 93 is caused to generate windows of two different periods corresponding to at least two different lines of the video signal. Can be

A video signal recording medium according to claim 18 is an ID for prohibiting copying of a continuous signal having a predetermined frequency in an effective line displayed on the screen of the video signal in the recording medium recording the video signal. It is characterized in that a signal is added.

[0017]

In the video signal output device according to the present invention, the ID signal for Y is generated from the Y ID generator 162, and the ID signal is generated in the effective line displayed on the screen of the video signal. Is added. Therefore, it becomes possible to output a video signal capable of reliably prohibiting copying.

In the video signal recording apparatus according to the fourteenth aspect, when an ID signal consisting of a continuous signal of a constant frequency is detected from the video signal in the effective line, recording of the video signal including this signal is prohibited. . Therefore, it is possible to surely prohibit copying of the video signal.

In the video signal recording medium according to the eighteenth aspect, an ID signal for prohibiting copying, which is a continuous signal having a predetermined frequency, is added to the effective line displayed on the screen. Therefore, even if a signal obtained by reproducing this video signal recording medium is recorded on another recording medium, the copy cannot be performed.

[0020]

1 shows the configuration of a system including a video signal output device, a recording device and a recording medium according to the present invention. In the master HDVTR 1, a high definition (HD) video signal is recorded on its built-in video tape. The master HDVTR 1 includes an additional circuit (C) 1A that adds an ID signal that prohibits copying. The video signal output from the master HDVTR 1 is supplied to, for example, the HD master video disc recorder 2, and a high-quality video signal is recorded on the master 3. The ID signal for prohibiting copying can be added to the video signal by the additional circuit 2A included in the HD master video disc recorder 2.

A stamper 4 is produced from the master 3 and a high-quality video disk (HDVD) 5 is produced from this stamper 4.

In this way, the HDVD 5 produced by the producer side is supplied to the user, reproduced by the HD player 6 possessed by the user, and the high-quality video signal (H
D signal) is output.

The HD signal output from the master HDVTR 1 is supplied to the slave HDVTR 7, and the HD tape 8
Recorded in. The slave HDVTR 7 also has an additional circuit 7A in which an ID signal for prohibiting copying can be recorded in the video signal recorded in the HD tape 8. On the producer side, the thus produced HD tape 8 is supplied to the user, reproduced by the HD player 9 possessed by the user, and output as an HD signal.

The high-definition video signal output from the master HDVTR 1 is also supplied to the user side via, for example, the CATV system.

Alternatively, the HD signal output from the master HDVTR 1 is the MUSE encoder 10.
Is input to MUSE format and is encoded. M
The MUSE signal output from the USE encoder 10 is MU.
It is supplied to the SE master video disc recorder 11 and recorded on the master 12. Even in this case, the ID signal can be added by the additional circuit 10A or 11A included in the MUSE encoder 10 or the MUSE master video disc recorder 11. A stamper 13 is manufactured from the master 12 and a video disc (MUSE VD (1
4)) is produced.

In this way, the MUSE video disc 14 produced on the producer side has the M
It is supplied to the USE player 15 and reproduced. MUSE
The MUSE signal output by the player 15 is used as it is, or after being decoded by the MUSE decoder 16 and converted into an HD signal, it is used.

MUS output from MUSE encoder 10
The E signal is also supplied to the slave MUSEVTR 21 and recorded on the MUSE tape 22. An ID signal is added to the video signal recorded on the MUSE tape 22 by the addition circuit 10A or 21A included in the MUSE encoder 10 or the slave MUSEVTR 21.

The MUSE tape 22 is also supplied to the user, reproduced by the MUSE player 23 of the user, and used as an MUSE signal or an HD signal after being decoded by the decoder 24.

Furthermore, the MUSE signal output from the MUSE encoder 10 is supplied to the user side via, for example, a broadcasting satellite and is used as the MUSE signal as it is, or after being decoded by the decoder 31, used as an HD signal. To be done.

On the user side, as shown in FIG.
MUSE on high-definition television receiver (HDTV) 41
A signal or HD signal is provided, where high quality images can be enjoyed. HDTV41 is MUS
The E decoder is built in, and when the MUSE signal is inputted as it is, it is decoded and displayed.

Next, the user, as shown in FIG.
The USE signal or HD signal can be recorded on the recording medium. That is, the MUSE signal is supplied to the MUSEVTR 51 and recorded on the built-in magnetic tape. Alternatively, a MUSE type recordable video disk device 52
It is supplied to and recorded on the built-in video disc.

Furthermore, the MUSE signal is MUSE-
After being supplied to the NTSC converter 53 and converted into an NTSC system video signal, they are supplied to an NTSC system VTR 54 or a video disk device 55 and recorded on a magnetic tape or a video disk, respectively.

Further, when input as an HD signal, it is supplied to the HDVTR 56 or the video disk device 57 and recorded on the built-in magnetic tape or video disk, respectively.

These VTRs or video disc devices are provided with detection circuits (D) 51A, 52A, 54, respectively.
A, 55A, 56A and 57A are provided, and when the ID signal is detected from the input signal, recording of the video signal on the recording medium is prohibited.

FIG. 4 schematically shows the format of the MUSE signal for one frame. As shown in the figure,
The MUSE signal consists of signals for 1125 lines, of which 516 lines from 47th line to 562th line and 5 lines from 609th line to 1124th line.
16 lines are assigned to the signals of the respective lines of the odd field and the even field.

In the present invention, for example, as shown in FIG. 5, an ID signal consisting of a continuous signal of a predetermined frequency is added to the 48th and 49th lines of the MUSE signal.
When the ID signal is added to the HD signal, the lines are the 43rd line and the 44th line.

As described above, the position where the ID signal is inserted is different between the MUSE signal and the HD signal because the 43rd line and the 44th line of the HD signal are converted into the MUSE signal and the 48th line thereof is converted. And the 49th line.

The MUSE signal has a value of 1 as shown in FIG.
One frame is composed of 125 lines. On the other hand, one frame of the NTSC video signal is composed of 525 lines. Therefore, MUSE
When converting a signal to an NTSC video signal, the effective lines are usually thinned out at a ratio of one to two.

For example, as shown in FIG. 6, the MUS of FIG.
Of the 47th line to the 562th line of the odd field of the E signal, the even line is thinned out and
257 lines of 9, 51, ..., 559, 561 constitute an effective line of an odd field of the NTSC system. Similarly, of the 516 effective lines from the 609th line to the 1124th line of the even field in FIG. 4, the even line is thinned out, and as shown in FIG. , 1121, 1123 257 lines form an effective line of an even field.

As described above, according to the MUSE-NTSC converter 53, every other line is thinned out.
As shown in FIG. 5, the 48th line (even line) and the 4th line
ID on 2 consecutive lines of 9 lines (odd line)
By recording the signal, at least one line remains as an effective line of the NTSC system.

That is, if the ID signal is recorded only on one line of the MUSE signal, or if the ID signal is recorded on two even lines or two odd lines, the MU
When the SE signal is converted into the NTSC video signal, lines including the ID signal may be thinned out. Therefore, as in the embodiment, it is preferable to record the ID signal on at least two lines of the odd line and the even line.

Furthermore, the MUSE-NTSC converter 53 has one of three types as shown in FIG.
In one system, the MUSE signal is converted into an NTSC system video signal. In the squeeze system shown in FIG. 7A, the left and right ends of an HD signal having an aspect ratio of 16: 9 correspond to the left and right ends of an NTSC screen having an aspect ratio of 4: 3. . As a result, the image becomes a vertically long image.

Further, in the zoom method shown in FIG. 7B, of the HD signal having the aspect ratio of 16: 9, only the image in the central range of 4: 3 (12: 9) is extracted and the left and right images are extracted. Video signals outside that area are discarded. In the case of this method, the image is not distorted, but the images near the left and right ends are lost.

On the other hand, in the case of the wide system shown in FIG. 7C, the horizontal direction of the HD signal corresponds to the horizontal direction of the NTSC system. In this method, the screen is not distorted, but the entire screen cannot be used, and there are regions where no image is substantially displayed above and below the screen.

The MUSE-NTSC converter 53 allows the user to select one of these three methods. In the case of the squeeze method and the wide method shown in FIGS. 7A and 7C, the signal of each line is within a predetermined range even though pixel data may be thinned out uniformly at a predetermined ratio. Not all pixel data is discarded, so the entire image is displayed. Therefore, the ID signal added there is MUSE
-No loss occurs even in the signal output from the NTSC converter 53.

However, in the case of the zoom method shown in FIG. 7B, if the ID signal is inserted only at the left or right end of each line, for example, MUSE-NTS.
Since the signal portion is deleted while being output from the C converter 53, the NTSC VTR 54 or the NTSC video disk device 55 cannot detect the ID signal.

In order to prevent this, in the present invention,
As shown in FIG. 8, the center 3/4 of the length of one line
The ID signal is recorded during the period including the range of (= 12/16). As a result, MUSE-NT
Even when the zoom method is selected by the SC converter 53, the ID signal is not lost.

In the above, the ID signal is arranged in each frame, but it may be arranged in each field.

Furthermore, in the above-mentioned embodiments, the ID signal is recorded in the luminance signal, but it is also possible to record the ID signal in the chroma signal. However, MUS
In the E signal, as shown in FIG. 9, the chroma signal is arranged so as to precede the luminance signal by four lines. That is, in order to record the ID signal on the chroma signal corresponding to the luminance signals YA and YB on the 47th and 48th lines, the ID signal is added to the chroma signal CA on the 43rd line and the chroma signal CB on the 44th line. Need to record. In this case, the ID signal can be recorded by forming a specific pattern for each line or each field by changing the level of the chroma signal.

Alternatively, the ID signal can be recorded by combining both the luminance signal and the chroma signal.

On the other hand, in order to record the ID signal on the HD signal itself, the luminance signal Y and the chroma signals P _R and P _B correspond to each other as shown in FIG. The ID signal may be recorded.

FIG. 11 shows the principle of recording / reproducing an ID signal according to the present invention. In this embodiment, the ID signal has a frequency ratio of 1: 3/4: 9/16, for example, 2.4 MHz, 3.2 MHz and 4.3.
A signal is obtained by adding signals (carriers) having a continuous frequency of MHz. The ID signal obtained by adding the signals of the three frequencies is recorded on the video disk 14. When this video disk 14 is decoded by the decoder 16, the ID
The three frequencies of the signal are 2.2 MHz and 2.9, respectively.
MHz or 3.9 MHz. This is due to the following principle.

That is, when the MUSE encoder 10 encodes the MUSE signal, its time axis is 11
Compressed to / 12. Therefore, when the decoder 16 decodes the MUSE signal, its time axis is expanded to 12/11 times in order to return it to the original time axis. I
Since the D signal is added to the MUSE signal whose time axis has already been compressed, that time axis is not compressed. As a result, when the decoder 16 extends the time axis 12/11 times, the frequencies are 2.4 MHz and 3.2 MH, respectively.
z or 4.3MHz, 11/12 times the frequency 2.2M
Hz, 2.9 MHz or 3.9 MHz. Therefore, the HD obtained by decoding by the decoder 16
From the signal, this 2.2 MHz, 2.9 MHz or 3.
The 9 MHz ID signal may be detected.

On the other hand, when the MUSE signal reproduced from the video disk 14 is converted into the NTSC system video signal by the MUSE-NTSC converter 53, if the conversion system is the wide system or the squeeze system, 2.4 MHz, 3. 2MHz or 4.3MH
The position of z is 1.3 MHz, 1.5 MHz or 2.0
It becomes MHz. That is, in these methods, 112
Since 5 high-definition video signal lines are thinned to about 1/2 and converted to 525 lines, the frequency when decoded into an HD signal is 2.2 MHz, 2.9 MHz or 3.9 MHz. This is because the frequency becomes 1/2.

On the other hand, when the zoom type conversion is performed, only about 3/4 of each line is used,
As a result of deleting the remaining 1/4, the frequency becomes about 3/4 that in the case of HD signal, 0.8 MHz, 1.3 MH
z or 1.5 MHz. That is, two substantially the same frequencies can be detected as the ID signal regardless of whether the signals are converted by the zoom method or by the wide method or the squeeze method.

FIG. 12 shows the configuration of an embodiment of an additional circuit for adding an ID signal to a MUSE signal. The sync separation circuit 161 separates a sync signal from the input MUSE signal, and outputs a timing signal synchronized with this to a Y ID generator 162, a C ID generator 163, a Y ID line pulse generator 164, and a C ID signal. ID line pulse generator 165
Is output to.

The Y ID generator 162 is constructed, for example, as shown in FIG. The oscillator circuit 401 outputs a sine wave having a predetermined frequency. The frequency dividing circuit 402, 403, or 404 divides the output of the oscillation circuit 401 by a predetermined frequency division ratio, converts the frequency into a predetermined frequency, and outputs the frequency. This division ratio is
The frequency ratios of the outputs of the frequency dividing circuits 402, 403, and 404 are set to be 1: 3/4: 9/16. By setting such a frequency ratio, as described above,
Regardless of the conversion method in the MUSE-NTSC converter 53, it is possible to obtain two signals having substantially the same frequency. These signals are added by the adder 405 and output as an ID signal.

This ID signal is input to the phase control circuit 166 and its phase is controlled. That is, the phase of this signal is the 48th of the MUSE signal, as schematically shown in FIG.
It is controlled so as to invert the line and the 49th line following the line. Alternatively, n frames and the next n
In the +1 frame, the phase is controlled so as to be inverted. Note that this phase control circuit may be provided between the frequency divider circuits 402, 403, 404 and the adder 405 shown in FIG.

By inverting the phase in this way, the ID signal can be made inconspicuous on the screen.

The signal set to a predetermined phase by the phase control circuit 166 is supplied to the emphasis circuit 167. The emphasis circuit 167 is configured as shown in FIG. 14, for example.

That is, the input signal is amplified by the amplifier 201, is then input to the delay circuit 203 via the resistor 202, is delayed by 60 ns, and then is input to the amplifier 2.
A coefficient 5/2 is multiplied by 04. On the other hand, the delay circuit 20
The signal not delayed by 3 is output by the multiplier 205 to −3 /
The factor of 2 is multiplied. The adder 206 is the multiplier 204
And the outputs of 205 are added and output.

The frequency characteristic of the signal output from the adder 206 is as shown in FIG. That is, the characteristics are emphasized in the high range. This characteristic almost corresponds to the de-emphasis characteristic shown in FIG. That is, the MUSE encoder 10 performs emphasis so as to emphasize the high frequency band of the video signal. Corresponding to this, the decoder 16 (same for 24 and 31)
In, de-emphasis is performed. Therefore, I
If the D signal is not emphasized as well as the added video signal, the waveform will be deteriorated when the decoder 16 is de-emphasized. Therefore, the ID signal is also emphasized.

The Y ID line pulse generator 164 connects the switch 170 to the contact point b in the section of the luminance signal on the 48th line and the 49th line of the MUSE signal in synchronization with the timing signal input from the sync separation circuit 161. Switch to the side. Switch 170 is in other periods,
It is switched to the contact a side. Therefore, the switch 170 outputs a signal in which the ID signal is added to the luminance signal section of the 48th line and the 49th line of the MUSE signal (a signal obtained by replacing the luminance signal with the ID signal).

The C ID generator 163 is also the Y ID generator 1.
It is configured similarly to 62 and outputs a signal obtained by adding signals of three predetermined different frequencies at a predetermined ratio. Similar to the case of the Y ID signal, this signal is phase-controlled by the phase control circuit 168, further emphasized by the emphasis circuit 169, and then supplied to the contact b of the switch 171. The ID pulse generator 165 for C is
The switch 171 is switched to the contact b side during the chroma signal of the 43rd line and the 44th line of the MUSE signal. The switch 171 is switched to the contact a during the other period. As a result, the switch 171 outputs the MUSE signal in which the ID signal is added to the chroma signal.

The contact a of the switch 171 has
Since the output of the switch 170 is supplied, the video signal that has passed through the switches 170 and 171 eventually becomes a signal in which the ID signal is added to one or both of the luminance signal and the chroma signal.

FIG. 17 shows the configuration of an embodiment of an adding circuit for adding an ID signal to an HD signal. The sync separation circuit 211 separates the sync signal from the input luminance signal,
Y ID generator 212, P _R ID generator 213, P _B ID generator 214, Y line pulse generator 215, P
Timing signals are output to the _R line pulse generator 216 and the P _B line pulse generator 217.

The Y ID generator 212 outputs an ID signal obtained by adding continuous signals of three different frequencies with a predetermined ratio, as in the case described above. This signal is controlled by the phase control circuit 218 to have a predetermined phase, and then input to the emphasis circuit 219 for emphasis and the switch 2
24 contact points b. Y line pulse generator 2
Reference numeral 15 switches the switch 224 to the contact b side in the periods of the 43rd line and the 44th line of the HD signal, and switches it to the contact a side in the other periods. As a result, the switch 224 outputs a luminance signal in which the 43rd line and the 44th line are replaced with the ID signal.

The ID signal in this case is as shown in FIG.
As shown in 1, the frequency is 2.2 MHz, 2.9 MHz or 3.9 MHz.

The reason why the line to which the ID signal is added is different from that in the case of the MUSE signal will be described later with reference to FIG.

The above is similarly applied to the chroma signal P _R and the chroma signal P _B. That is, the ID signal output from the P _R ID generator 213 is phase-controlled by the phase control circuit 220, then emphasized by the emphasis circuit 221 and supplied to the contact b of the switch 225. The switch 225 is switched according to the control signal output by the P _R line pulse generator 216, and the switch 225 switches the 43rd line and the 44th line of the chroma signal P _R.
The ID signal is added to the line and output.

The ID signal output from the P _B ID generator 214 is phase-controlled by the phase control circuit 222, and then emphasized by the emphasis circuit 223.
It is supplied to the contact b of the switch 226. Switch 226
Is switched to the contact a or the contact b side in response to the control signal output from the P _B line pulse generator 217.
This causes the switch 226 to output the fourth chroma signal P _B.
A signal to which the ID signal is added is output to the 3rd line and the 44th line.

The above-mentioned additional circuit shown in FIG. 12 is used as the additional circuit of the MUSE encoder 10, the MUSE master video disk recorder 11 or the slave master VTR 21 of FIG. 1 as the additional circuit 10A, 11A or 21A. The additional circuit shown in FIG. 17 is used as the additional circuit 1A, 2A or 7A in the master HDVTR 1, HD master video disk recorder 2 and slave HDVTR 7 of FIG.

Next, the detection circuit for detecting the ID signal will be described with reference to FIG. The ID detection circuit 91 of FIG. 18 is configured as shown in FIG. 19, for example. In this embodiment, for example, a signal having a frequency of 4.3 MHz is extracted from the input signal of the bandpass filter 301. In addition, the bandpass filter 302 is 3.2 MHz.
The signal of the frequency of is separated. Rectifier circuits 303 and 304
Rectifies the outputs of the bandpass filters 301 and 302, respectively, and outputs them to the comparison circuits 305 and 307. Comparing circuits 305 and 307 are the batteries 306 or 308, respectively.
Compares the level of the signal input from the rectifier circuit 303 or 304 with the reference voltage output by the rectifier circuit 303 or 304, and outputs a logic H signal when the output of the rectifier circuit 303 or 304 is larger than the reference value. The AND gate 309 receives a logic H signal from both the comparison circuits 309 and 307, that is, 4.3 MHz by the bandpass filters 301 and 302.
And a continuous signal of 3.2 MHz is detected, a signal of logic H is output.

On the other hand, the vertical sync detection circuit 92 of FIG.
The vertical sync signal is detected from the input MUSE signal, and the detected signal is output to the window generator 93. The window generator 93 generates a logic H window at a predetermined timing in synchronization with the detection signal input from the vertical synchronization detection circuit 92. The AND gate 94 operates during the period in which the window generator 93 is generating a window.
When the ID detection circuit 91 outputs the detection signal, the ID detection signal is output to the recording circuit 95. The recording circuit 95 prohibits the recording operation of the MUSE signal when the logic H ID detection signal is input from the AND gate 94. When the logic H detection signal is not input from the AND gate 94, the recording circuit 95 records the MUSE signal on the recording medium.

It should be noted that the circuit shown in FIG.
When detecting the D signal, the frequencies of the bandpass filters 301 and 302 are 3.9 MHz and 2.9 MH.
Either z or 2.2 MHz is set. Also,
When detecting the ID signal from the NTSC video signal, the frequency is set to 1.5 MHz or 1.3 MHz. This makes it possible to reliably detect the ID signal regardless of the converter 53 method. Note that it is possible to use only one frequency signal as the ID signal, but by causing the ID detection signal to be output when both of at least two signals are detected at the same time, noise due to noise or the like is caused. It is possible to suppress the malfunction.

Next, the window output by the window generator 93 will be further described with reference to FIG. As shown in FIG. 20, the ID signal is recorded in the 48th and 49th lines of the MUSE signal. These 48th and 49th lines are the decoders 16, 24 or 31 shown in FIG. When decoded by, it is output as the 43rd line or the 44th line.

Therefore, when the detection circuit shown in FIG. 18 is used as the detection circuits 51A and 52A of the MUSEVTR 51 or the MUSE video disk device 52 shown in FIG. 3, the window generator 93 operates as the MU.
A window including the 48th line and the 49th line of the SE signal in the center is generated. On the other hand, when the detection circuit shown in FIG. 18 is used as the detection circuit 56A or 57A of the HDVTR 56 or the HD video disk device 57, the window generator 93 outputs the 43rd line and the 44th line of the HD signal. Generate a window with the timing included in the center.

Furthermore, when the MUSE signal is converted by the MUSE-NTSC converter 53 in FIG. 3, the signals on the 48th line and the 49th line of the MUSE signal are of the zoom type or the squeeze type as shown in FIG. It is converted to the 21st line in the NTSC signal. On the other hand, in the case of the wide system,
Converted to line 51. Therefore, the detection circuit shown in FIG. 18 is the NTSC VTR 54 or NTS shown in FIG.
Detection circuit 54A or 55 of C video disk device 55
When used as A, the window generator 93 generates two windows, a first detection window centered on the 21st line of the NTSC signal and a second detection window centered on the 51st line. Which window is generated is determined according to which method the user has selected.

The relationship between the lines before and after the conversion is an example, and the conversion as in the above example is not necessarily standardized. Therefore,
The center of the window is appropriately set for each device. In addition, since the 47th line of the MUSE signal is often thinned out when it is converted to the NTSC system, the ID signal is not inserted there in the above embodiment.
In principle, it can also be inserted there.

[0080]

As described above, according to the present invention, an ID signal composed of a continuous signal of a predetermined frequency for prohibiting copying is recorded in the effective line displayed on the screen. It is possible to reliably prohibit the copying of signals.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a system including a video signal output device, a video signal recording device, and a video signal recording medium of the present invention.

FIG. 2 is a diagram showing a configuration of an example of a display device that displays a signal output from the embodiment of FIG.

3 is a block diagram showing a configuration example of an apparatus for recording a signal output from the embodiment of FIG.

FIG. 4 is a diagram illustrating a format of a MUSE signal.

FIG. 5 is a diagram illustrating the position of an ID signal in a MUSE signal according to the present invention.

FIG. 6 is a diagram illustrating thinning of lines in a MUSE-NTSC conversion operation.

FIG. 7 is a diagram illustrating a conversion method of the MUSE-NTSC converter 53 in FIG.

FIG. 8 is a diagram illustrating a relationship between an ID signal insertion position and a conversion method.

FIG. 9 is a diagram illustrating the positions of ID signals of a luminance signal and a chroma signal in a MUSE signal.

FIG. 10 is a diagram illustrating the position of an ID signal in an HD signal.

FIG. 11 is a diagram illustrating the principle of recording / reproducing an ID signal.

FIG. 12 is a block diagram showing a configuration of an embodiment of an addition circuit for adding an ID signal to a MUSE signal.

13 is a block diagram showing a configuration of a Y ID generator 162 in FIG.

14 is a block diagram showing a configuration example of an emphasis circuit 167 in FIG.

15 is a diagram illustrating the emphasis characteristic of the embodiment of FIG.

16 is a diagram illustrating the de-emphasis characteristic of the decoder 16 in FIG.

FIG. 17 is a block diagram showing the configuration of an embodiment of an addition circuit for adding an ID signal to an HD signal.

FIG. 18 is a block diagram showing the configuration of an embodiment of a detection circuit for detecting an ID signal.

19 is a block diagram showing a configuration example of an ID detection circuit 91 of FIG.

20 is a diagram for explaining the window generation timing of the window generator 93 in FIG.

[Explanation of symbols]

 1 Master HDVTR 2 HD Master Video Disc Recorder 5 HD Video Disc 6 HD Player 7 Slave HDVTR 8 HD Tape 9 HD Player 10 MUSE Encoder 11 MUSE Master Video Disc Recorder 14 MUSE Video Disc 15 MUSE Player 16 Decoder 21 Slave MUSEVTR 22 MUSE Tape 22 MUSE Tape MUSE player 24 Decoder 31 Decoder 41 HD television receiver 51 MUSEVTR 52 MUSE video disc device 53 MUSE-NTSC converter 54 NTSCVTR 55 NTSC video disc device 56 HDVTR 57 HD video disc device 91 ID detection circuit 92 Vertical sync detection circuit 93 Window generation Container 94 AND GATE 95 Recording circuit 161 same Phase separation circuit 162 Y ID generator 163 C ID generator 164 Y ID line pulse generator 165 C ID line pulse generator 166 Phase control circuit 167 Emphasis circuit 168 Phase control circuit 169 Emphasis circuit

Claims (18)

[Claims] 1. An ID generating means for generating an ID signal which prohibits copying of a continuous signal having a predetermined frequency, an adding means for adding the ID signal generated by the ID generating means to a video signal, and the ID. And a control means for controlling the adding means so that the signal is added to a valid line displayed on the screen of the video signal. 2. The ID generating means generates first continuous signal generating means for generating the continuous signal having a first frequency, and the continuous signal having a second frequency different from the first frequency. The video signal output device according to claim 1, further comprising: a second continuous signal generating means; and an adding means for adding the continuous signal of the first frequency and the continuous signal of the second frequency. 3. The ID generating means further comprises third continuous signal generating means for generating the continuous signal having a third frequency different from the first frequency and the second frequency, and the first continuous signal generating means. The video signal output device according to claim 2, wherein a ratio of the frequency, the second frequency and the third frequency is set to 9/12: 3/4: 1. 4. The video signal output device according to claim 1, further comprising phase control means for inverting the phase of the continuous signal for each field or line. 5. The video signal output device according to claim 1, further comprising an emphasis unit that emphasizes the continuous signal. 6. The video signal output device according to claim 1, wherein the ID signal is added to a luminance signal of the video signal. 7. The video signal output device according to claim 1, wherein the ID signal is added to a chroma signal of the video signal. 8. The ID signal is added to a luminance signal and a chroma signal of the video signal.
6. The video signal output device according to any one of 5 to 5. 9. The video signal output device according to claim 1, wherein the video signal is a MUSE signal. 10. The video signal output device according to claim 1, wherein the video signal is a high-definition video signal. 11. The ID signal is arranged in at least two different fields.
11. The video signal output device according to any one of 1 to 10. 12. The video signal output device according to claim 1, wherein the ID signal is added to at least two consecutive lines. 13. The video signal output device according to claim 1, wherein the ID signal is arranged at a position including a range of at least about 3/4 of a center of a line. 14. A generating means for generating a window corresponding to a predetermined range in the effective line displayed on the screen of the video signal, and an effective line displayed on the screen of the video signal by using the window. A detection means for detecting an ID signal composed of a continuous signal having a predetermined frequency, and a recording means for prohibiting the recording of the video signal in accordance with the detection result of the detection means. Video signal recording device. 15. The detection means compares a bandpass filter for extracting a continuous signal of the predetermined frequency, a rectifier circuit for rectifying an output of the bandpass filter, and an output of the rectifier circuit with a predetermined reference value. 15. The video signal recording device according to claim 14, further comprising: 16. The detecting means has one of the bandpass filter, the rectifying circuit and the comparing circuit corresponding to continuous signals of two different frequencies, and the output of the comparing circuit corresponding to continuous signals of each frequency. 16. The video signal recording apparatus according to claim 15, further comprising an arithmetic circuit that calculates a logical product of 17. The video signal is a MUSE signal N times.
17. A signal decoded into a TSC format video signal, wherein said generating means generates windows of two different periods corresponding to at least two different lines of said video signal.
The video signal recording device according to. 18. A recording medium recording a video signal, wherein the video signal is added with an ID signal which is a continuous signal of a predetermined frequency and which prohibits copying, in an effective line displayed on the screen. A video signal recording medium characterized by.