JPH0514841A - Video signal processing circuit and image pickup system - Google Patents

Abstract

PURPOSE:To simplify the configuration of a system by displaying a video signal obtained from a door camera or a monitor camera by inserting it into the screen of a conventional television monitor. CONSTITUTION:The video signal X(t) containing a synchronizing signal SYC is inputted to a video signal synthesizer circuit 11, and simultaneously, it is inputted to a synchronizing separation circuit 13, and after eliminating a video component, it is supplied to a synchronizing signal generation circuit 14. The synchronizing signal generation circuit 14 gives the synchronizing signal SYC to a television camera side to obtain the video signal Y(t) so as to synchronize the operation of the television camera with the video signal X(t). A switching control circuit 12 inserts an video image based on the video signal Y(t) into a part of the video image based on the video signal X(t) by selecting and outputting one of the video signals X(t), Y(t) at timing to meet the synchronizing signal SYC, and substituting the video signal Y(t) for a part of the video signal X(t). Then, a sound signal y(t) accompanying the video signal Y(t) is detected out of the video signal Y(t) by a sound signal detection circuit 15, and is outputted to a telephone set, etc.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a first video signal and a second video signal.
The present invention relates to a video signal processing circuit for synthesizing video signals of the above and an imaging system using the same.

[0002]

2. Description of the Related Art In an image pickup system using a surveillance camera, a door camera or the like, by reproducing an image from a television camera within a range of 1/4 or 1/9 of a reproduction screen, a plurality of images can be simultaneously confirmed. Composed. As described above, as a method of reproducing the image of the TV camera in a specific range on the reproduction screen, the image information of the image signal is thinned out by an appropriate pixel unit, or the image information is compressed by combining, It is realized by configuring a television camera using an image pickup device whose number is omitted.
At this time, the format of the video signal is not changed so that the video signal can be reproduced on the TV monitor,
Therefore, the video component is compressed and superimposed within a specific period of the horizontal scanning period and the vertical scanning period.

FIG. 10 is a block diagram of an image pickup system in which a part of a predetermined image is replaced with an image from a television camera and displayed. The video signal source 1 for obtaining the main screen is composed of, for example, a TV tuner or a video tape recorder that operates based on an NTSC synchronizing signal, and a video signal synthesizing circuit 2 for converting a video signal X _(t) in a format according to the synchronizing signal.
Supply to. On the other hand, the television camera 3, which is a surveillance camera or a door camera, operates according to a synchronization signal created inside the television camera 3, and inputs a video signal Y _(t) in a format according to the synchronization signal to the video signal synthesis circuit 2. The scanning timings of these video signals X _(t) and Y _(t) do not match because the video signal source 1 and the television camera 3 operate at their own timings.
At the scanning timing of the video signal Y _(t)
The video signal Y _(t) is combined with the video signal X _(t) in conformity with the scanning timing of _(t) .

The video signal synthesizing circuit 2 includes a field memory 4 for storing one screen of video information of the video signal Y _(t) ,
Synchronous signals SYC _X and SYC _Y are respectively separated from the screen control circuit 5 and the video signals X _(t) and Y _(t) that temporarily store the video information in the field memory 4 and then read the video information at a predetermined timing. The sync separation circuits 6 and 7 are provided to the screen control circuit 5. The video signal Y _(t) input from the television camera 3 is input to the memory control circuit 5 via the A / D conversion circuit 8 and the video information for one screen is input to the field memory 4 at the timing according to the synchronization signal SYC _Y. Written. The video information written in the field memory 4 is read at a timing according to the synchronization signal SYC _X , and is supplied to one input of the selection circuit 10 via the D / A conversion circuit 9. The video signal X _(t) from the video signal source 1 is supplied to the other input of the selection circuit 10, and the video signal X _(t) and the video signal Y _(t) are synchronized with each other by a synchronization signal S.
By selecting and synthesizing at a timing based on YC _X , a part of the image from the image signal source 1 is displayed on the television camera 3
The video signal Z _(t) for inserting and displaying the video from is created and output. Regarding the video signal Y _(t) , since the television camera 3 is configured by using an image sensor having a small number of pixels, the video information amount in the horizontal scanning period and the vertical scanning period is 1 of the video signal X _(t) . / N. Therefore, the video image of the video signal Y _(t) is displayed in the range of 1 / n ² of the reproduction screen, and the video signal X _(t) is displayed in this range.
The operation of the synthesis circuit is controlled so that _(t) and the video signal Y _(t) can be replaced.

According to the above configuration, the video signal source 1
A part of the screen can be replaced with the screen of the TV camera 3, and two screens can be simultaneously displayed on one TV monitor.

[0006]

In the above structure, since the video signal X _(t) needs to be temporarily stored in the field memory 4, the video signal Y _(t) is converted into a digital value. An A / D converter 8 and a D / A converter 9 for converting a digital value into a video signal Y _(t) again are required, but in general, an A / D for processing a video signal having a large amount of information.
Since the converter and the D / A converter are required to operate at high speed, the converter and the D / A converter have a special circuit configuration, which causes a high cost of the video signal synthesizing circuit 2.

Further, in the case of a surveillance camera or a door camera that operates irregularly, the video signal Y _(t) is combined with the video signal X _(t) according to the rising of the operation of the television camera 1. In a TV monitor that reproduces the video signal X _(t) from a TV tuner or a video tape recorder, the TV monitor is not always ON when the TV camera 1 is started up, so the TV monitor is OFF. Sometimes when the operation of the TV camera 1 starts up,
The TV monitor would also need to be configured to turn on at the same time.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to simplify the circuit configuration of a video signal processing circuit for synthesizing video signals and to provide an inexpensive imaging system which can be constructed using this video signal processing circuit.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a first feature in that the first video signal forming the first video is added to the first video signal. In a video signal processing device for synthesizing a second video signal forming the second video and obtaining a third video signal for displaying by inserting the second video in a part of the first video, a predetermined television system A first input terminal to which a first video signal of a format corresponding to is input, and a synchronization for removing a video component from the input first video signal and creating a synchronization signal including a horizontal component and a vertical component. Signal generating means, a second input terminal to which a second video signal synchronized with the synchronization signal is input,
Either the first video signal or the second video signal is selected at a timing synchronized with the synchronization signal, a part of the first video signal is replaced with the second video signal, and a third video signal is selected. Video signal synthesizing means for obtaining
And a detection circuit for detecting an audio signal accompanying the video signal, and output means for independently outputting the audio signal and the third video signal.

A second feature is that the first video signal forming the first video and the second video signal forming the second video are combined, and the first video signal forming a part of the first video is combined with the first video signal. An image pickup device for obtaining the second video signal and an audio signal accompanying the second video signal in a video signal processing circuit for obtaining a third video signal for inserting and displaying the second video signal; and the third video. In an imaging system in which a video display device that reproduces and displays a signal and an audio reproduction device that reproduces an audio signal accompanying the second video signal are connected, the video signal processing circuit includes: A sync signal generating means for removing a video component to obtain a sync signal, and either the second video signal supplied from the image pickup device or the first video signal supplied from another video signal source, Select at the timing according to the sync signal A video signal synthesizing means for replacing a part of the first video signal with the second video signal to obtain a third video signal, and the audio supplied from the imaging device along with the second video signal. A receiving circuit for receiving a signal, and the third video signal and the audio signal are supplied to the video display device and the audio reproducing device, respectively, and the audio reproducing device is operated by the video signal processing circuit. A remote control means for turning on the power supply of the video display device when receiving an audio signal is provided.

[0011]

According to the present invention, the second video signal synchronized with the first video signal is replaced with a part of the first video signal, and the second video is inserted into a part of the first video for display. The third video signal is output, the audio signal accompanying the second video signal is detected, and the video signal and the audio signal are output. Therefore, the video based on the second video signal is displayed on a part of the screen of the video display device that plays back the first video signal, and the sound associated with the second video signal is played back on the audio playback device such as a telephone. .

Further, according to the image pickup system of the present invention, when the image pickup apparatus connected to the video signal processing apparatus is activated, a signal notifying the activation of the image pickup apparatus is sent from the video signal processing circuit to the audio reproduction apparatus to reproduce the sound. The device operates, and the power of the video display device is turned on by the operation of the audio reproducing device.

[0013]

FIG. 1 shows the configuration of a video signal processing device according to the present invention.
You First video input from the first input terminal V-IN
Signal X_(t)Is the second video signal Y_(t)Together with video signal synthesis
Input to the circuit 11 and created by the switching control circuit 12 described later
The video signal Y based on the selected signal SLC_(t)And synthesis
And the third video signal Z_(t)Video output terminal V-O
It is output from the UT. Second video signal Y_(t)Is the input end
What is supplied from the imaging device connected to the child C-IN
Then, the video signal X _(t)The scanning timing is synchronized with
Image component is video signal X_(t)Is set to 1 / n. Immediately
Then, the imaging device connected to the second input terminal C-IN,
Configuration using an image sensor with the number of pixels omitted to 1 / n
Together with the video signal X_(t)Same as the sync signal SYC corresponding to
The video signal Y_(t)Image component of
1 / n each of horizontal scanning period and vertical scanning period
Compressed to video signal Y _(t)The scanning timing of
Image signal X_(t)Match.

Further, the video signal X _(t) is _supplied to the sync separation circuit 1
3 is supplied to the synchronizing signal generating circuit 14 after the video component is removed and used as the reference clock of the phase locked loop for generating the synchronizing signal SYC. The sync separation circuit 13 gives a predetermined threshold value to the video signal X _(t) to remove a video component of a level exceeding this threshold value, and to generate a timing pulse according to the timings of horizontal scanning and vertical scanning as a sync signal generating circuit. Supply to 14. Then, the synchronization signal generation circuit 14 forms a phase lock loop with the timing pulse supplied from the synchronization separation circuit 13 as a reference,
By decoding the count value of the counter that counts the output, a new synchronization signal SYC is created and supplied from the input terminal C-IN to the imaging device side. The synchronization signal SYC is supplied to the image pickup device side that obtains the video signal Y _(t), and at the same time, the switching control circuit 12 that creates the selection signal SLC.
Is supplied to. Here, the switching control circuit 12 is composed of a counter and a decoder, and a selection signal SLC for switching the video signal synthesis circuit 11 so as to replace the video signal X _(t) with the video signal Y _(t) at the timing set in the decoder. To create.

Further, the video signal Y _(t), since the audio signal y _(t) obtained at the same time has been superimposed is frequency-modulated in the imaging apparatus for obtaining the image signal Y _(t), the audio signal detection circuit 15 Thus, the audio signal y _(t) is extracted from the video signal Y _(t) . Then, the extracted audio signal y
_(t) is the video signal Z created by the video signal synthesis circuit 11.
Separately from _(t) , the sound is output from a sound output terminal A-OUT to a sound reproducing device such as a telephone. Therefore, in the video signal Y _(t) obtained from the image pickup device connected to the input terminal C-IN, the video component is inserted into the video signal X _(t) , and the video output terminal V-
The audio component is output from OUT, and the audio component is output from the video output terminal A-OUT separately from the video component.

According to the video signal processing device as described above,
A video signal obtained by a TV camera such as a door camera or a surveillance camera can be inserted and displayed on the screen of a general TV monitor that displays a video signal from a television broadcast or a video tape, and an audio signal accompanying the video signal can be displayed. It can be played back by a telephone or the like. Next, the operation of the video signal synthesizing circuit 11 for creating the video signal Z _(t) for displaying the 1 / n sub-screen on a part of the main screen as shown in FIG. 2 will be described.

When sub-screens each having a size of 1 / n in the horizontal and vertical directions are superimposed on the main screen, the video signal X _(in the period of 1 / n of the horizontal scanning period (1H) and the vertical scanning period (1V)). _The selection pulse SLP is set so as to replace _t) with the video signal Y _(t) . That is, in the vertical scanning period, as shown in FIG. 3, the period is 1 / n of the vertical scanning period.
The selection pulse SLP rises to (V / n), and the selection circuit 1
9 is switched to the video signal Y _(t) side. On the other hand, in the horizontal scanning period, as shown in FIG.
The selection pulse SP falls during the period of / n (H / n).

FIG. 5 shows the configuration of the switching control circuit 12 for generating the selection signal SLC for controlling the switching of the video signal synthesizing circuit 11. The vertical counter 21 is reset by the vertical synchronizing signal VD, counts by the horizontal synchronizing signal HD, and inputs the count output to the decoder 22. Decoder 2
2 decodes the output of the counter 21 to generate a timing signal delayed by a period corresponding to an integral multiple of the horizontal scanning period with respect to the vertical synchronizing signal VD, and supplies the timing signal to the selection pulse generating circuit 23. Then, the selection pulse creation circuit 2
At a timing 3 according to the output of the decoder 22, the video signal synthesizing circuit 11 generates a selection pulse SLC _V for selecting the video signal Y _(t) side in a predetermined period. On the other hand, the horizontal counter 24 is reset by the horizontal synchronizing signal HD and counts with the basic clock CLK, and the count output is input to the decoder 25. The decoder 25 is the decoder 2
By decoding the output of the counter 23 as in 2,
A timing signal delayed by a period corresponding to an integral multiple of the cycle of the clock CLK with respect to the horizontal synchronizing signal HD is supplied to the selection pulse creating circuit 26. Then, the selection pulse producing circuit 26 generates a selection pulse SLC _H for selecting the video signal Y _(t) side for a predetermined period according to the output of the decoder 25.

These selection pulses SLC _V and SLC _H are
The signals are combined by the logic gate and are supplied to the video signal combining circuit 11 as the selection pulse SLC.
C _V, configured as a video signal synthesizing circuit 11 when showing the SLP _H to select a video signal Y _(t) side together to select the video signal Y _(t) side. For example, the selection pulses SLC _V and SLC _H shown in FIGS. 3 and 4 are combined by an AND gate to obtain the selection pulse SLC, so that the selection pulse SLC _V is in the rising period and the selection pulse SLC Video signal synthesizing circuit 1 while _H is rising
1 is switched to the video signal Y _(t) side.

Another embodiment of the present invention is shown in FIG. In this figure, a video signal synthesizing circuit 11, a switching control circuit 12,
The sync separation circuit 13 and the sync signal generation circuit 14 are the same as those in FIG. 1, and the same parts are designated by the same reference numerals. The activation detection circuit 16 that receives the video signal Y _(t) input from the input terminal C-IN detects the rise of the image pickup device connected to this input terminal C-IN. When Y _(t) is input, the switching control circuit 12 and the audio signal detection circuit 15 are activated. That is, the activation detection circuit 16 outputs the output (selection signal SL) of the switching control circuit 12 when the imaging device is in the standby state.
C) is fixed, and the selection of the video signal of the video signal synthesis circuit 11 is constantly set to the video signal X _(t) side and the audio signal y _(t)
Stop the output of. Then, when the image pickup apparatus starts up and enters the image pickup state, the output of the switching control circuit 12 is inverted at the timing set in the circuit to start the synthesis of the video signal in the video signal synthesis circuit 11, and at the same time, the audio signal is output. The signal detection circuit 15 outputs the audio signal y _(t) . At this time, a signal indicating the rising edge of the voice signal y _(t) is sent from the voice signal detection circuit 15 to the telephone or the like connected to the output terminal A-OUT so that the telephone may generate a ringing tone. Composed.

A start signal ST indicating the start of the image pickup device
A control terminal CON for outputting R to the outside is provided, and an activation signal STR is supplied from the control terminal CON to a device connected to each terminal. Here, the activation signal STR is used, for example, to turn on the power source of the television monitor connected to the output terminal V-OUT, so that even if the imaging device is activated while the television monitor is in the off state, The TV monitor is turned on in conjunction with this, and the image from the imaging device can be confirmed.

FIG. 7 shows the configuration of an image pickup system using the video signal processing device of the present invention. The first input terminal of the video signal processing circuit 30 receives a radio wave of television broadcast and receives a video signal X _(t) according to a predetermined television format.
Is connected to the TV tuner 31, and the second input terminal is formed of a door camera, a surveillance camera, or the like, and the video signal Y
_The TV camera 32 that obtains _(t) is connected. Video signal X
_The television tuner 31 that obtains _(t) operates based on a synchronization signal according to the NTSC format or the PAL format, and supplies the synchronization signal CSY together with the video signal X _(t) to the video signal processing circuit 30. On the other hand, the television camera 32 that obtains the video signal Y _(t) operates according to the synchronization signal CSY supplied from the video signal processing circuit 30, and the synchronization signal CSY
The video signal Y _(t) is supplied to the video signal processing circuit 30 in synchronism with. Further, this television camera 32 is provided with a microphone arranged in parallel to receive the sound from the subject, and the audio signal y _(t) is transmitted along with the video signal Y _(t).
Supplied to zero. Here, the synchronization signal CSY and the video signal Y
_{When (t)} is synchronized with each other, they can be overlapped with each other. Therefore, a line for transmitting the video signal Y _(t) to the video signal processing circuit 30 and a line for transmitting the synchronization signal CSY to the television camera 32 are provided. Can be common. Furthermore, if the audio signal y _(t) obtained by the television camera 32 is frequency-modulated and superimposed on the connection line, it can be transmitted on the same line as the video signal Y _(t). Therefore, the video signal processing circuit 3
It is possible to make a single connection line connecting 0 and the television camera 32.

A video monitor 33 for displaying the video signal Z _(t) is connected to the video output terminal of the video signal processing circuit 30, and a telephone set for reproducing the audio signal y _(t) is connected to the audio output terminal. 34 is connected. The telephone 34 is usually connected to a telephone line and operates as a monitor of the audio signal y _(t) only when the audio signal y _(t) is input from the video signal processing circuit 30. The telephone 34 is provided with a remote control function for operating the power supply of the TV monitor 33. When the telephone 34 receives the audio signal y _(t) and generates a ringing tone, the TV monitor 33 is turned on at the same time. To be configured. Therefore, the TV camera 3
When the video signal Y _(t) including the audio signal y _{(t )} is supplied to the video signal processing circuit 30 by the start of imaging by the video signal 2, the video signal processing circuit 30 detects the audio signal y _(t). And supplies the telephone 34 with a ringing tone, and supplies the television monitor 33 with the video signal Z _{(t) in} which the video signal X _(t) and the video signal Y _(t) are combined. At this time,
If the TV monitor 33 is in the on state and the video according to the video signal X _(t) is displayed, the video according to the video signal Y _(t) is inserted into this video, and if the TV monitor 33 is in the off state, the TV monitor 33 is displayed. Is turned on and the video signal Y
Only the image according to _(t) will be displayed.

The structure of the television camera 32 for obtaining the video signal Y _(t) is shown in FIG. The sync separation circuit 41 takes out the sync signal CSY from a connection line connecting the video signal processing circuit 30 and the television camera 32 and supplies the sync signal CSY to the sync signal creation circuit 42. The sync signal creation circuit 42 forms a phase lock loop with the sync signal CSY supplied from the sync separation circuit 41 as a reference, creates a sync signal including each component of vertical scanning and horizontal scanning, and supplies the sync signal to the imaging unit 40. To do. The image pickup unit 40 includes a solid-state image pickup device such as a CCD image sensor and a drive circuit for driving the solid-state image pickup device, and the solid-state image pickup device is driven at a timing according to the synchronization signal CSY. The output of the image pickup unit 40 is subjected to predetermined signal processing by the signal processing circuit 43 and output as a video signal Y _(t) . Then, the power supply circuit 44 that supplies electric power to the image pickup unit 40 and the signal processing circuit 43 is configured to start the television camera 32 upon receiving a start signal ON from a switch or a sensor. That is, when the start switch is turned on by the person being monitored or the sensor detects the movement of the person being monitored, power is supplied from the power supply circuit 44 to the image pickup unit 40 or the like, so that the television camera 32 takes an image from the standby state. It is launched to the state. At this time, the microphone attached to the image pickup unit 40 is also activated at the same time, and the video signal Y
_Along with _(t) , the audio signal y _(t) from the monitored person is supplied to the video signal processing circuit 30 side.

Next, FIG. 7 shows the configuration of the telephone 34 for reproducing a voice signal. This telephone 34 has a voice signal y _(t)
Audio signal processing unit 50 and video signal Z for receiving and reproducing
_The audio signal processing unit 50 includes a remote control unit 60 for operating the power supply of the television monitor 33 displaying _(t).
The remote control unit 60 is configured to generate a code signal for turning on the power supply of the television monitor 33 according to the audio signal y _(t) received by the television monitor 33.

Audio signal y_(t)Communication circuit 51 for receiving
Is a connection for connecting the video signal processing circuit 30 and the telephone 34.
Received audio signal y connected to the continuation line_(t)Communication system
Supply to the control circuit 52. The communication control circuit 52 is a communication circuit.
Audio signal y supplied from 51 _(t)To the speaker 53
It is also played as a voice and installed in the speaker 53.
The voice signal from the microphone 54 is received and communication is performed.
Supply to path 51. This communication control circuit 52 has an input key
-Controls corresponding to various control commands input from
The key control circuit 56 that generates the control signal is connected.
Configured to control the transmission and reception of audio signals.
It For example, the video signal Y_(t)Audio signal input with
y_(t)This telephone 34 is used as a voice monitor
The command to function as (intercom) is the command
By inputting from the key 55, the communication control circuit 52
Received voice signal y_(t)Is supplied to the speaker 53
The voice signal from the microphone 54 to the communication circuit 51
To the TV camera 32 side. Also, this key
The troll circuit 56 is normally connected to the communication control circuit 52.
Of the voice signal between the telephone line connected to the communication circuit 51
It controls the delivery and communication when transmitting audio signals.
The voice code is transmitted by attaching the dial code signal.
Is configured as follows.

Further, the key control circuit 56 receives various commands to the communication control circuit 52 when a command for operating the telephone 34 as a remote control transmitter for operating the power supply of the television monitor 33 is input from the command key 55. The signal transmission is stopped, and instead, a control signal is supplied to the remote control unit 60. When a command for turning on the television monitor 33 is input from the command key 55, the addressing circuit 61 that receives a control signal from the key control circuit 56 reads out the code data stored in the memory 62 and supplies it to the LED drive circuit 63. . This LED drive circuit 63 causes the LED 64 to blink according to the code data read from the memory 62, thereby causing the LED 64 to transmit a code signal corresponding to the code data. Here, the code data is the TV monitor 3
The code signal of the infrared light transmitted from the LED 64 is set so as to turn on the power of the television monitor 33. As the memory 62 for storing the code data, a writable memory such as SRAM is used, and the code data suitable for the television monitor 33 that needs to be operated is the photo sensor 65 and the data register 66.
It is taken into the memory 62 by. That is, the code signal serially output from the attached remote control transmitter for operating the television monitor 33 is transmitted to the photo sensor 65.
By sequentially receiving at and fetching in the data register 66,
Code data suitable for the television monitor 33 is stored in the data register 66, an appropriate address is given to the code data, and the code data is stored in the memory 62. Then, when turning on the power supply of the television monitor 33, the address is designated to read the code data, the code data is supplied to the LED drive circuit 63, and the code signal is transmitted from the LED 64 to the television monitor 33. Therefore, if the television monitor has a remote control function using infrared rays, the telephone 34
The remote control unit 60 can be operated.

In addition to the code signal for operating the power supply of the television monitor 33, a code signal for switching the screen of the television monitor 33 and for volume control is fetched into the photo sensor 65 and the data register 66, and the code data is stored in the memory 62. If stored in, the remote control unit 60 can perform various operations on the television monitor 33. For example, by the telephone 34, the audio signal y
_{When (t)} is reproduced, the sound generated by the television monitor 33 is reduced by operating the telephone 34 to reduce the sound signal y.
It is also possible to make the reproduced sound of _(t) easy to hear.

Further, the addressing circuit 61 for designating the address of the memory 62 to generate the code signal for turning on the television monitor 33 operates in response to the control signal from the key control circuit 56, and is indicated by a broken line. As described above, the address can be designated by receiving the activation signal from the communication control circuit 52. That is, when the communication control circuit 52 receives the audio signal y _(t) , the address designating circuit 61 automatically designates the address of the memory 62, so that the video signal processing circuit 30 receives an image from the television camera 32. When the audio signal y _(t) is input together with the signal Y _(t) , the telephone 34 generates a ringing tone and turns on the television monitor 33. Therefore, in the television camera 32 as shown in FIG. 8, when the power is turned on, the television monitor 33 operates in conjunction with the television camera 32.
Is turned on, it is not necessary to operate the switch of the television monitor 33 when reproducing the video signal Y _(t) from the television camera 32 even when the television monitor 33 is in the off state.

[0030]

According to the present invention, a television camera operating in external synchronization between a video signal source such as a television tuner and a television monitor displaying the video signal, and a telephone for reproducing an audio signal accompanying the video signal. By providing a video signal processing circuit to which the device is connected, it is possible to easily insert the video from the TV camera into the video from the video signal source and display it on the TV monitor. The accompanying audio signal can be played on the telephone. Therefore, it is possible to check the images from the door camera and the surveillance camera with a simple configuration, and the wiring connection is extremely easy,
Moreover, an inexpensive imaging system can be provided.

Further, by operating the power supply of the television monitor on the side of the telephone for reproducing the audio signal, when the video signal and the audio signal are supplied from the television camera when the television monitor is in the off state, The power of the television monitor can be turned on at the same time when the audio signal is monitored, and the operation of the imaging system can be simplified.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a video signal processing circuit of the present invention.

FIG. 2 is a schematic diagram showing a display state of a screen.

FIG. 3 is an operation timing chart of a vertical scanning cycle of the signal processing circuit.

FIG. 4 is an operation timing chart of a horizontal scanning cycle of the signal processing circuit.

FIG. 5 is a block diagram showing a configuration of a switching control circuit.

FIG. 6 is a block diagram showing another embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of an image pickup system of the present invention.

FIG. 8 is a block diagram showing a configuration of a television camera of the image pickup system.

FIG. 9 is a block diagram showing a configuration of a telephone of the imaging system.

FIG. 10 is a block diagram showing a configuration of a conventional imaging system.

[Explanation of symbols]

1 Video signal source 2 Video signal processing circuit 3 32 TV camera 11 30 Video signal synthesis circuit 12 Switching control circuit 13 41 Synchronous separation circuit 14 42 Synchronization signal generation circuit 15 Audio signal detection circuit 21 24 counter 22 25 decoder 23 26 Selection pulse creation circuit 31 TV tuner 32 TV camera 33 TV monitor 34 telephone 40 Imaging unit 43 Signal processing circuit 44 power supply circuit 51 communication circuit 52 Communication control circuit 53 speakers 54 microphone 55 Command key 56 key control circuit 61 Addressing circuit 62 memory 63 LED drive circuit 64 LED 65 photo sensor 66 data register

Claims (7)

[Claims] 1. A first image signal forming a first image is combined with a second image signal forming a second image, and the second image is inserted into a part of the first image for display. In a video signal processing device for obtaining a third video signal, a first input terminal to which a first video signal in a format corresponding to a predetermined television system is input, and the first video signal input A sync signal generating means for removing a video component and creating a sync signal including a horizontal component and a vertical component, a second input terminal to which a second video signal synchronized with the sync signal is input, and the sync signal The above first at the synchronized timing
Video signal synthesizing means for selecting either the video signal or the second video signal and replacing a part of the first video signal with the second video signal to obtain a third video signal; A video signal processing device comprising: a detection circuit for detecting an audio signal accompanying the video signal, and an output means for independently outputting the audio signal and the third video signal. 2. The video according to claim 1, wherein a synchronizing signal corresponding to the first video signal is given from the second input terminal to an image pickup means connected to the second input terminal. Signal processing device. 3. The video signal synthesizing means replaces a portion of the first video signal with a second video signal when a video component of the second video signal is detected. The described video signal processing device. 4. A first image signal forming the first image is combined with a second image signal forming the second image, and the second image is inserted in a part of the first image and displayed. A video signal processing circuit for obtaining a third video signal, an image pickup apparatus for obtaining the second video signal and an audio signal accompanying the second video signal, and a video display apparatus for reproducing and displaying the third video signal. And an audio reproducing device for reproducing an audio signal accompanying the second video signal, wherein the video signal processing circuit removes a video component from the first video signal and outputs a synchronization signal. And a second video signal supplied from the image pickup device or the first video signal supplied from another video signal source is selected at a timing according to the synchronization signal. And a part of the first video signal To a second video signal to obtain a third video signal, and a receiving circuit that receives the audio signal supplied from the imaging device along with the second video signal. Then, the third video signal and the audio signal are supplied to the video display device and the audio reproducing device, respectively, and the audio reproducing device receives the audio signal from the video signal processing circuit. An imaging system comprising remote control means for turning on a power source of a display device. 5. The image pickup system according to claim 4, wherein the video signal processing circuit replaces a part of the first video signal with the second video signal in synchronization with the rising of the image pickup apparatus. . 6. The imaging device for obtaining the second video signal operates at a timing based on a sync signal corresponding to the first video signal, and a second video synchronized with the first video signal.
5. The image pickup system according to claim 4, wherein the image signal of is supplied to the image signal processing circuit. 7. The remote control means of the audio reproduction device stores a predetermined code signal for instructing the power-on of the video display device, and the video signal is output when the code signal is detected. The imaging system according to claim 4, wherein the image is transferred to a display means.