JPS6016790B2 - television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to enable a television receiver to use the commercial period effectively by playing back another image when a commercial is broadcast.

According to a color television system such as the NTSC system, a color image should be reproduced with the correct hue on the receiver side without any hue adjustment.

However, in reality, color images are not always reproduced with the correct hue due to variations in television stations, etc., so color receivers are designed to allow hue adjustment. However, if hue adjustment is enabled in this way, even if you try to reproduce a color image with the correct hue, the reproduced color image will not tell you the actual hue, so you will have to adjust it to the correct hue. I can't.

Therefore, in the present invention, for example, in such a case, the color bar is reproduced, so that the hue can be adjusted correctly.

In other words, for example, when a commercial from a manufacturer of color television receivers is broadcast, if you are watching it on a general color television receiver, the commercial will be played back as a normal screen, as shown in Figure 1A. However, when viewing on a color receiver according to the present invention, a commercial is played and two color bars Cm and Cn are displayed in a part of the commercial, as shown in FIG. 1B, for example. At this time, the hue of one color bar Cm changes as the receiver adjusts the hue, but the hue of the other color bar Cn is constant and serves as a reference for the hue adjustment, and the hue can be adjusted using these. This is how it was done. For this reason, the present invention utilizes cue signals sent from television stations.

That is, when a commercial is broadcast, if a cue signal is inserted into the color video signal, the color bar C skin Cn is reproduced as described above. However, in this case, the following requirements are required for the cue signal.

i It is easy to extract the cue signal on the receiving side.

(v) Be able to reliably distinguish it from other signals.

Bait Cue signals should not interfere with broadcast reception. iv It can be recorded and played back on a VTR etc. without any problems.

On the other hand, the screen being transmitted by the television station is Et in Figure 2 A.
Assuming that the screen that can actually be viewed on a general television receiver, that is, the effective screen, is the portion indicated by Ee, and a frame-shaped portion E around this effective screen Ee.

is an overscan part and cannot be seen. Therefore, it is conceivable to send a cue signal by paying attention to such points.

That is, the overscan portion 8. A cue signal is sent during the horizontal scanning period, and this cue signal is
It is an alternating signal whose phase changes at a specific frequency and at a predetermined period. FIG. 3 shows an example of a device for inserting a cue signal into the color video signal.

That is, in FIG. 3, a color video signal is output from an input terminal 1 through a clamp circuit 2, and further through a switch circuit 3 which is switched to the state shown in the figure when no cue signal is inserted to an output terminal 4.

10' also shows a cue signal forming circuit.

That is, the color video signal from the terminal 1 is supplied to the synchronization separation circuit 11, and as shown in FIG. 4A, the horizontal synchronization pulse Ph, the vertical synchronization pulse Pv, and the equalization pulse Pe are
These pulses Ph to Pe are taken out with negative polarity, and are supplied to the monostable multipipelator 12, and as shown in FIG. , Ah, in the horizontal period, the pulse width is set as a pulse Pb that is longer than the 1/Z horizontal period and shorter than one horizontal period, and this pulse Pb is supplied to the next monostable multipipelator 13 as shown in Fig. 4. As shown in C, it rises every time the pulse Pb rises, and
The pulse Pc is sufficiently narrow, and this pulse Pc is
It is supplied to the sampling hold circuit 21 as the sampling pulse. This sampling hold circuit 2
1 constitutes the AFC circuit 20 together with VC○ (voltage controlled variable frequency oscillation circuit) 22 and the like;
022 to an alternating signal S having a free running frequency of, for example, 44fh (fh is the horizontal frequency). is extracted, and this signal S. is supplied to the frequency dividing circuit 23 and divided into signals having a frequency of fh, this frequency divided signal is connected to the waveform shaping circuit 24 to be converted into, for example, a trapezoidal wave signal, and this trapezoidal wave signal is sent to the sampling hold circuit 21. It is combined as an input signal. Therefore, in the sampling and holding circuit 21, the oblique portion of the trapezoidal wave signal is sampled and held by the pulse Pc, and a DC signal having a level corresponding to the phase difference between the trapezoidal wave signal and the pulse Pc is extracted.

This DC signal is then supplied to VC022 as its control signal, and therefore an alternating signal S from VC022. The frequency and phase of are locked to pulse Pc. And this police box signal S.

is supplied to one contact of the switch circuit 15, and is also supplied to the inverter 16, resulting in an opposite phase alternating signal -S. and this signal -S. is applied to the other contact of the switch circuit 15. Further, the pulse Pc from the multipipulator 13 is supplied to the flip-flop circuit 17 to form a pulse Pd which is inverted every horizontal period as shown in FIG. Supplied as a signal. Therefore, switch circuit 1
From 5 onwards, signal S.

and-S. are taken out alternately every horizontal period, that is, line sequentially. And this signal S. and one S. This line sequential signal, that is, the queue signal Sq, is supplied to the switch circuit 3. Also, when necessary, that is, when commercials are broadcast, overscan portion E is provided.

The control circuit 30 for inserting the cue signal Sq during the scanning period is configured as follows, for example. In other words, the switch 31 is a cue switch, which connects the power supply 3
switch 31 by being switched to 2 or ground.
A signal of “1” or “0” is taken out from , and this signal is supplied to the AND circuit 33 . Further, the pulses Ph to Pe from the synchronous separation circuit 11 are supplied to the integrating circuit 34, and as shown in FIG. 5A, a vertical period pulse Pa is taken out. Pf is supplied as shown in FIG. 5B, that is, the pulse Pa rises, and as shown in FIG. A pulse Pf that falls at 1 is formed.

Then, this pulse Pf is coupled to the next monostable multipipelator 36, and as shown in FIG. 5C, the pulse Pf
The pulse Pg rises at the falling edge of Pg and falls at the beginning or slightly earlier of the following vertical blanking period, that is, the overscan portion E, as shown by diagonal lines in FIG. 2B. Among them, the pulse Pg that rises during the period tu corresponding to the lower part Eu of the effective screen Ee is extracted, and this pulse Pg is sent to the AND circuit 3.
V is supplied to 3. Furthermore, the pulse Pc from the multipipelator 13 is supplied to the sampling hold circuit 41 as the sampling pulse. This sampling hold circuit 41 forms the basis of the AFC circuit 40 together with the VC042 and the waveform shaping circuit 43.
042, as shown in FIG.
is supplied to the shaping circuit 43 and converted into a triangular wave signal Sj that changes periodically with the pulse Pi, as shown in FIG. 4, and this signal Sj is supplied to the sampling and holding circuit 41 as its input. Therefore, sampling hold circuit 4
1, the hypotenuse portion of the signal Sj corresponding to the falling period of the pulse Pi is sampled and held by the pulse Pc, and a DC signal with a level corresponding to the phase difference between the signal Si and the pulse Pc is generated. taken out.

This DC signal is then supplied to VC042 as its control signal, so that the frequency and phase of pulse Pi from VC042 are locked to pulse Pc, and the phase falls during the horizontal planking period tb. At the same time, the pulse Pi has a rising phase during the horizontal scanning period th, and this pulse Pi is supplied to the AND circuit 33.

The output signal of the AND circuit 33 is supplied to the switch circuit 3 as its control signal, and the switch circuit 3 is switched to the state shown in the figure when the output signal of the AND circuit 33 is "0", and when it is "1", the switch circuit 3 is switched to the state shown in the figure. , the state is switched to the opposite state as shown in the figure.

According to this configuration, when the switch 31 is switched to the ground side as shown in the figure, the output signal of the AND circuit 33 becomes "0", so the switch circuit 3 is in the state shown in the figure. It remains switched. Therefore, in this case, the color video signal from the terminal 1 is taken out as it is to the terminal 4 through the clamp circuit 2 and the switch circuit 3. On the other hand, when the switch 31 is switched to the opposite state as shown in the figure, the cue signal Sq is inserted into the video signal during the period tu corresponding to the shaded portion Eu in FIG. 2B.

That is, in this case, among the input signals of the AND circuit 33, the signal from the switch 31 is "1", and the pulse Pg is the shaded portion Eu in FIG. 2B, as shown in FIG. 5C.
becomes "1" during the period tu corresponding to , and the pulse P
As shown in FIG. 4E, i is "1" during the horizontal scanning period th.
becomes. Therefore, during the horizontal scanning period th in the period tu, the output signal of the AND circuit 33 becomes "1" and the switch circuit 3 is switched to the state opposite to that shown in the figure. 4
It is taken out. However, in this case, during the horizontal ranking period tb, the pulse Pi becomes "0" and the AND circuit 33
Since the output signal of is also "0", the switch circuit 3 is switched to the state shown in the figure, and the horizontal synchronizing pulse Ph of the color video signal is taken out from the terminal 1 to the terminal 4.

In this way, the color video signal is normally taken out to the terminal 4, but when the cue switch 31 is switched to the opposite state as shown in the figure, the overscan portion E is output.

A cue signal Sq is extracted from the lower portion Eu in place of the color video signal during the horizontal scanning period th. That is, the color video signal from terminal 1 includes a cue signal S.
q is inserted and taken out to terminal 4. This color video signal is then transmitted.

Next, an example of a color television receiver according to the present invention will be explained.

In FIG. 6, 50 is a high frequency/intermediate frequency circuit including from a tuner to a video detection circuit.The color video signal from this circuit is combined with a deflection circuit 51 to form vertical and horizontal deflection signals, etc. The color video signal from 50 is supplied to the color signal processing circuit 53 including a color demodulation circuit etc. through the switch circuit 52 which is switched to the state shown in the figure when it is not during the period of the color bar Cm. A color difference signal and a luminance signal are extracted.

In this case, in the burst gate circuit 54, the circuit 5
A burst signal is extracted from the carrier color signal of the color video signal starting from 0, and this burst signal is supplied to a continuous wave signal forming circuit 55 to form a continuous alternating signal (subcarrier) for color demodulation. Then, the signal from the processing circuit 53 is
Again, the switch circuits 56R, 56B, 56Y are switched to the state shown in the figure at times other than the period of the color bar Cn.
are supplied to the matrix circuit 57 through the amplifiers 58R and 58 as primary color signals of red, green, and blue.
The light is supplied to the color picture tube 59 through G, 588, and a color image is reproduced.

Furthermore, a six-color parser generator is shown, which forms color bar signals reproduced as color bars Cm and Cn (FIG. 1B). That is, the formation circuit 5
The alternating signal from 5 is supplied as a subcarrier to a balanced modulation circuit 61B, and is also phase-shifted by /2 in a phase shift circuit 62 and then supplied to a balanced modulation circuit 61R as a subcarrier. Further, the color video signal from the circuit 50 is supplied to a synchronization separation circuit 63 to extract a horizontal periodic pulse Pc (FIG. 4C), and this pulse Pc is supplied to a Cuffover signal forming circuit 64 as a synchronization pulse. As shown in FIG. 7, blue and red color difference signals Cb and Cr and a luminance signal Cy whose levels change in accordance with the color of the color bar are formed, and the signals Cb and Cr are modulated and input to modulation circuits 61B and 61R. Supplied as. And modulation circuits 618, 61R
The modulated signal is sent to the adder circuit 65 to form a carrier color signal for the color bar, and the adder circuit 65 also receives the burst signal from the burst gate circuit 54 and the luminance signal from the forming circuit 64. The signal Cy is supplied to form a color video signal Sm that is reproduced as a color bar Cm.

This signal Sm is then supplied to the other contact of the switch circuit 52. In addition, signals Cb, Cr,
Cy is also reproduced as a color bar Cn, and these signals Cb to Cy are transmitted through switch circuits 56B, 56R, 5
6Y is supplied to the other contact. Further, the detection circuit 70 for the cue signal Sq is configured as follows, for example.

That is, the color video signal from the circuit 50 is supplied to the bandpass filter 71. This filter evening 71 is
This is for extracting a signal component with a frequency of 44L from the supplied color video signal. Therefore, if the cue signal Sq is being sent, that cue signal Sq is extracted, and if the cue signal Sq is not being sent, , a signal component having a frequency of 44L in the video signal is extracted. When the cue signal Sq is being sent, the filter 71
The cue signal Sq from is supplied to one contact of the switch circuit 72 and is also supplied to the inverter 73 to become a signal -Sq with an inverted phase, and this signal -Sq is supplied to the other contact of the switch circuit 42. be done.

Further, the horizontal period pulse Pc from the synchronous separation circuit 63 is a flip-flop. As shown in FIG. 4D, the pulse Pd that is supplied to the tube circuit 74 is inverted every horizontal period, and this pulse Pd is supplied to the switch circuit 72 as its control signal. It can be switched alternately for each period. Therefore, from the switch circuit 72,
Signal S in signal Sq. and signal S in signal -Sq. and are taken out alternately every horizontal period, i.e., the signal S except for the horizontal blanking period tb. are taken out continuously. And this signal S. is supplied to the phase comparator circuit 81 constituting the PLL 80, and an alternating signal with a free running frequency of 44fh is taken out from the VC082, and this alternating signal is phase-shifted by phase/2 in the phase shift circuit 83, and then sent to the comparator circuit. 81. In this way, in the comparison circuit 81, the alternating signal S from the switch circuit 72 is processed. and the alternating signal from the phase shift circuit 83 are compared in phase, and a DC signal with a level corresponding to the phase difference between these alternating signals is extracted.This DC signal is supplied to the VC082 as its control signal, and the alternating signal from this The frequency and phase of the signal are the signal S from the switch circuit 72. is locked. Further, a signal S from the switch circuit 72. is supplied to the phase comparison circuit 75, and at the same time, the alternating signal from VC082 is supplied to the comparison circuit 75, and the phases of these alternating signals are compared. In this case, the characteristics of the phase comparator circuits 81 and 75 are shown as shown in FIG. and,
There is a phase difference of m/2 between the signal from the phase shift circuit 83 and the signal S. There is no phase difference between the signal from VC082 and the signal from VC082. Since these signals with no phase difference are compared in phase in the comparator circuit 75 with the characteristics shown in FIG. 8, at this time, a DC signal with a maximum level of "11" is obtained from the comparator circuit 75. It turns out. On the other hand, when the cue signal Sq is not sent, a video signal component with a frequency of 44fh is taken out from the filter 71, so the switch circuit 72 outputs that video signal component and a video signal having the opposite phase. A bran sequential signal with the components is obtained, and this is supplied to phase comparator circuits 81 and 75. However, since the phase of this bran sequential signal is random, VC
082 is not locked to point P, and the phase of the alternating signal from this point also becomes random. Since the signals with random phases are compared in phase in the comparator circuit 75, the comparison output is averaged (integrated) and becomes "0". In this way, the level of the output signal from the comparator circuit 75 is
When the cue signal Sq is being sent, it is "11", and when it is not being sent, it is "0".

However, in this case, the switch 31 on the transmitting side
Even if the cue signal S is switched to the opposite state from that shown in the figure,
q is the horizontal scanning period t in the period tu of the lower portion Eu
Therefore, the level of the output signal of the comparison circuit 75 is only "11" during the period th in the period tu, and is "0" during the other periods.

Therefore, the output signal of this comparison circuit 75 is supplied to a waveform shaping circuit, for example, a retriggerable type monostable multipipulator 76 whose inversion period is slightly longer than one field period.

Therefore, if the switch 31 is switched to the opposite state to that shown in FIG.
The cue signal S is "1" during the period when the switch 31 is switched to the state opposite to that shown in FIG. 3, and becomes "0" during the period when the switch 31 is switched to the state shown in the figure.
A q detection signal is obtained. This detection signal is supplied to the AND circuit 91, and also the color video signal from the circuit 50 and the synchronization separation circuit 92, and as shown in FIG. 5A, a vertical period pulse Pa is extracted. This pulse P. is supplied to the AND circuit 91 , and the output signal of the AND circuit 91 and the horizontal period pulse Pc from the synchronous separation circuit 63 are further supplied to the switching signal forming circuit 93 . When the output signal of the AND circuit 91 changes from "0" to "1", this forming circuit 93 generates a pulse Pm as shown in FIG.
That is, it forms a pulse Pm that rises during the period tm during which the color bar Cm is reproduced. This pulse Pm is sent to the switch circuit 52 as its control signal, and the switch circuit 52 When the pulse Pm is rising, the state is switched to the state shown in the figure, and when the pulse Pm is rising, the state is switched to the state opposite to that shown in the figure. Further, the pulse Pm from the forming circuit 93 and the pulse Pc from the synchronous separation circuit 63 are supplied to the switching signal forming circuit 94, and from these pulses Pm and Pc, the color bar Cn is reproduced as shown in FIG. 5E. period tn
A rising pulse Pn is formed, and this pulse Pn is supplied to the switch circuits 56R to 56B, and the switch circuits 56R to 56B are switched to the state shown in the figure when the pulse Pn is falling, and when the pulse Pn is rising. When there is, the state is switched to the opposite state as shown in the figure.

According to this configuration, when the cue signal Sq is not being sent during broadcasting of a drama or the like, the output signal of the multipipulator 76 is "0", so the output signal of the AND circuit 91 is also "0", Therefore, since the switch circuits 52, 56R to 568, in which both the pulses P and Pn are falling, are switched to the state shown in the figure, a color image is normally reproduced, for example, as shown in FIG. 1A.
However, when the broadcast becomes a commercial and the cue signal Sq is sent at the same time, the output signal of the multipipulator 76 becomes "1", so the output signal of the AND circuit 91 becomes "0" for each pulse Pa. becomes “1”. Therefore, since the pulse Pm is in a rising state during the period tm, the switch circuit 52 is switched to the state opposite to that shown in the figure. Since the color video signal Sm is sent to the processing circuit 53, a color bar Cm is reproduced on the screen as shown in FIG. 1B, for example. Further, a period t following the period tm
In period tn, the pulse pn rises, so the switch circuits 66R to 56B are switched to the opposite state as shown in the figure. Therefore, during this period tn, the color difference signals Cr, Cb and the luminance signal Cy are supplied to the matrix circuit 57, so that a color bar Cn is reproduced on the screen below the color bar Cm by the signals Cr to Cy.

Thus, in the color television receiver according to the present invention,
When a cue signal Sq is sent during a commercial, a color bar C skin Cn is reproduced on the reproduction screen.

In this case, the signal Cr~Cy which becomes the color bar Cn
is supplied to the matrix circuit 57 without passing through the color signal processing circuit 53, so even if hue adjustment is performed in the processing circuit 53, the hue of the color bar Cn remains constant and is the correct hue.

On the other hand, the color video signal Sm that becomes the color bar Cm
is demodulated in color through the processing circuit 54 and then sent to the matrix circuit 57. Therefore, when hue adjustment is performed in the processing circuit 53, the hue of the color bar Cm changes accordingly. At this time, the hue of the color bar Cm and the hue of the commercial image match. Therefore, by adjusting the hue of the color bar Cm based on the hue of the color bar Cn, a color image with the correct hue can be reproduced.

In this case, as mentioned above, when a commercial for a color television receiver manufacturer is broadcast, the color bar C
In order to play back the commercials m and Cn, the commercial is printed on a tape using a VTR, a cue signal Sq is inserted at that time, and the tape is handed over to the television station to broadcast the commercial. Just go.

That is, if you do that, when the commercial airs,
Since a cue signal Sq is also sent at the same time, when viewing on the receiver shown in FIG. 6, color bars Cm and Cn are played along with the commercial as shown in FIG. 1B.
You can adjust the hue. At this time, if the image is viewed on a general television receiver, such color bars Cm and Cn will not be reproduced, and the image will become an ordinary commercial as shown in FIG. 1A. And only in commercials like this, Kafuba C skin
Since Cn is regenerated, there is no confusion when watching TV.In fact, the color bars Cm and Cn are regenerated only when the commercial of that manufacturer is shown. It will improve your image.

Furthermore, as explained in FIG.
output signal) can be extracted.

In addition, the phase of the cue signal Sq is inverted every horizontal period, and the phase is constant during each horizontal scanning period, so the configuration shown in FIG. 6, for example, ensures that it can be distinguished from other signals. be able to. Furthermore, the cue signal S
q is the overscan part B.

Since the signal is sent during the horizontal scanning period th, the video signal system of this button is not affected, and there is no problem in receiving the broadcast on both receivers that can demodulate the cue signal Sq and receivers that cannot. . Furthermore, even when recorded and reproduced on a VTR or the like, the cue signal Sq will not be lost or distorted. In the above example, the color bars Cm and Cn are played back as separate images during the commercial period so that hue adjustment can be performed, but in the example described below, the image from the television camera is played back. This is the case when it is set as follows. That is, in FIG. 9, 100' shows a television camera (ITV camera), and a synchronizing pulse is supplied from the deflection circuit 51 to the camera 1001, and a video signal from the camera 100 is supplied to the other contact of the switch circuit 52. be done.

Furthermore, when the cue signal Sq is sent from the AND circuit 91, a pulse that becomes "1" in the vertical period is obtained, but this pulse is generated by a switching signal forming circuit, for example, a retrigger whose inversion period is approximately one field period. A switching signal is formed during the field period in which the cue signal Sq is supplied to the bull type monostable multiviprator 101 and is sent, and this switching signal is sent to the switch circuit 52 as its control signal. When the switching signal is falling, the switching circuit 52 is switched to the state shown in the figure, and when it is rising, the switch circuit 52 is switched to the state opposite to that shown in the figure. When the program is being broadcast and the cue signal Sq is not being sent, the switch 52 is switched to the state shown in the figure, so that the program is reproduced.

However, when the queue signal Sq is sent at the same time as the commercial broadcast, the switch circuit 52 is switched to the opposite state as shown in the figure, so that the video signal from the camera 100 is reproduced as an image during the commercial period. Therefore, if the camera 100 is installed in a child's room, for example, the situation in the child's room can be automatically seen for each commercial.In particular, since commercials are broadcast every 30 minutes at most, the situation in the child's room can be clearly seen. can know,
There is no need to worry about accidents. FIG. 10 shows yet another example.

That is, a color video signal from the circuit 50 is supplied to a recording/reproducing device 1101 that uses a magnetic sheet, magnetic card, magnetic tape, etc. as a recording medium, and at any time, for example, if it is a cooking program, a list of ingredients is displayed. When a recording switch (not shown) of this device 110 is operated, that field or frame is recorded. When it is time to broadcast a commercial, the switching signal from the forming circuit 101 switches the switch circuit 52 to the state opposite to that shown in the figure, and the device 110 enters the playback state, and the video signal of the material list that was recorded earlier is played back as a still. be done. As described above, according to the present invention, for example, when a commercial is broadcast, other images such as color bars are played back, and the commercial period can be effectively utilized.

In addition, at a television station, the pulses Pc, Pi, and P6 can also be obtained from the horizontal period and vertical period pulses obtained from a synchronization board.

Furthermore, the cue signal Sq is overscanned by the overscan portion E.
For example, instead of sending the period tu of the lower part Eu of the overscan part E. It can also be sent during the upper period, in which case the pulse Pf may fall at the upper end of the image transmission screen Et. Alternatively, the cue signal Sq is overscanned by the portion E.

It is also possible to send it during the effective screen Ec period instead of sending it during the period .In that case, the cue signal Sq is inserted into the video signal using a technique such as chromakey, and the cue signal is displayed on the screen of the television receiver. What is necessary is to reproduce Sq as a pattern. Further, in FIG. 6, the shaping circuit 76 may be used as an integrating circuit and a peak value detection circuit to obtain a detection signal that becomes "1" continuously during the period when the switch 31 is switched to the opposite state from that in FIG. 3. I can do it.

Furthermore, the color bars Cm and Cn can be displayed on the entire screen or, for example, at the top of the screen.

Further, the cuff bar Cn does not necessarily have to be exposed. Furthermore, the levels of the signals Cr-Cy are changed in conjunction with the hue adjustment of the processing circuit 53, and the signals Cr-Cy are supplied to the matrix circuit 57 during the period tm, so that the color bar Cm
You may issue Furthermore, in the example of FIG. 10, the device 11
0, record multiple arbitrary fields or frames,
It is also possible to reproduce the data sequentially using the cue signal Sq. Alternatively, it is also possible to record a signal such as a fax sent during the horizontal or vertical blanking period and reproduce it using the cue signal Sq.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams for explaining the present invention, FIG. 3 is a system diagram of an example of a cue signal insertion device, and FIGS. 4 and 5 are waveform diagrams for explaining the same, FIG. 6 is a system diagram of one example of the present invention, FIGS. 7 and 8 are waveform diagrams and characteristic diagrams for explaining the same, and FIGS. 9 and 10 are system diagrams of other examples of the present invention. . 60 is a color purge generator, and 70 is a cue signal detection circuit. Figure 1A B Figure 2A B Figure 4Figure 5Figure 7Figure 8Figure 3Figure 6Figure 9Figure 10

Claims (1)

[Claims] 1. In a television receiver that receives a video signal in which a queue signal having a specific waveform different from the original video signal waveform is inserted into a part of the scanning period outside the effective screen in a predetermined period, the queue signal A detection circuit is provided to detect the presence or absence of the video signal, and the output of this detection circuit controls a switch circuit provided in the video signal path, so that another video signal is reproduced as an image in place of the video signal during the predetermined period. TV receiver.