JPH0438628Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a signal processing device used to construct a screen by processing, for example, a television broadcast screen and a graphic screen created by a computer.

BACKGROUND ART As a peripheral device for a personal computer, there is a device called a superimposer for processing video signals. This superimposer is used to superimpose a video signal such as a graphic screen created by a computer and a video signal of television broadcasting, and output the resultant signal as a single video signal.
Since the synchronization is different between the video signal from the computer and the video signal from television broadcasting, in order to superimpose the two signals, it is necessary to synchronize the video signal output from the computer to the video signal from television broadcasting. Need to be in sync.

Problems to be Solved by the Invention The above-mentioned superimposer not only superimposes a video signal from a television broadcast and a video signal from a computer, but also superimposes a video signal from a computer into a video signal from a television broadcast, etc. It also has the function of synchronizing with a synchronization signal, processing it into a video signal, and outputting it. Therefore, the superimposer must switch the path for inputting the reference synchronization signal depending on its operating state. In the prior art, the switching operation is performed manually, which is complicated and may lead to incorrect operation.

An object of the present invention is to provide a video signal processing device that can automatically select a synchronization signal included in two signals according to the setting state and process the signal based on the selected synchronization signal. be.

Means for Solving the Problems The present invention provides an input terminal T1 and a first video signal generating means 2 which may or may not provide a first video signal to the input terminal T1, The generating means 2 generates the video signal and the horizontal synchronization signal HO included in the video signal.
2 and the vertical synchronization signal VO included in the video signal.
2, a horizontal synchronizing signal input terminal HI1 and a vertical synchronizing signal input terminal VI1, the horizontal synchronizing signal input terminal HI
a second video signal generating means 3 for deriving a second video signal synchronized with the horizontal synchronizing signal input from VI1 and the vertical synchronizing signal input from the vertical synchronizing signal input terminal VI1; an output terminal T2; and an input terminal T1. When a video signal is applied to the input terminal T1, the video signal applied to the input terminal T1 and the video signal from the second video signal generation means 3 are processed and output to the output terminal T2, and the video signal is input to the input terminal T1. is not provided, a video signal processing circuit 4 that outputs the video signal from the second video signal generating means 3 as it is to the output terminal T2;
synchronization signal separation detection means 5, 6 for separating and deriving the horizontal synchronization signal H and vertical synchronization signal V included in the video signal from the input terminal T1; and detecting that the video signal is applied to the input terminal T1. In response to the output of the video detection circuit 6, the input terminal T1
When a video signal is given to the second video signal generating means 3, the horizontal synchronizing signal H from the synchronizing signal separation detecting means 5, 7 is applied to the horizontal synchronizing signal input terminal HI1 of the second video signal generating means 3, and the synchronizing signal separating detecting means 5, The vertical synchronizing signal V from 7 is applied to the vertical synchronizing signal input terminal VI1 of the second video signal generating means 3, and the vertical synchronizing signal V from input terminal T
1, the horizontal synchronizing signal HO2 from the first video signal generating means 2 is applied to the second video signal generating means 2.
Horizontal synchronization signal input terminal HI of video signal generation means 3
1, and data selector means 9, 13 for supplying the vertical synchronizing signal VO2 from the first video signal generating means 2 to the vertical synchronizing signal input terminal VI1 of the second video signal generating means 3. It is a signal processing device.

Effect According to the present invention, when no video signal is applied to the input terminal T1 from the first video signal generation means 2 and other external circuits, the video detection circuit 6 performs the following operations.
The data selector means 9, 13 detects that no video signal is applied to the input terminal T1 and responds to the output of the video detection circuit 6. The synchronizing signal VO2 is connected to the horizontal synchronizing signal input terminal HI1 and the vertical synchronizing signal input terminal of the second video signal generating means 3.
VI1, respectively, so that the second video signal generating means 3 sends a second video signal synchronized with the input horizontal and vertical synchronizing signals to the output terminal T2 via the video signal processing circuit 4. Therefore, the video signal from this output terminal T2 can be recorded, for example, on a video tape recorder, or alternatively, the video signal from this output terminal T2 can be transmitted to a visual display means, such as a cathode ray tube. It can be displayed by tilting it. The first video signal generating means 2 is, for example, a television receiver, and the second video signal generating means 3 is, for example, a computer. By recording the images on the video tape recorder, the images recorded on the video tape recorder can be easily reproduced using an existing television receiver or the like.

When a video signal is input to the input terminal T1 from the first video signal generation means 2 or other external circuit, the horizontal synchronization signal H and vertical synchronization included in the video signal input to the input terminal T1 are synchronized. The signal V is separated and derived by the synchronization signal separation and detection means 5 and 7. On the other hand, the video detection circuit 6 detects that the video signal is applied to the input terminal T1, and the video detection circuit 6 detects that the video signal is applied to the input terminal T1. In response to the output of Give to HI1 and VI1 respectively,
In this way, a video signal synchronized with the video signal applied to the input terminal T1 is supplied from the second video signal generation means 3 to the video signal processing circuit 4, and therefore the processing circuit 4
Now, the video signal from the second video signal generating means 3 and the video signal applied to the input terminal T1 are processed by, for example, superimposing them, and the thus processed video signal is derived from the output terminal T2. The video signal derived from this output terminal T2 may be recorded, for example, on a video tape recorder, or alternatively may be displayed using a cathode ray tube. In this way, when a video signal is applied to the input terminal T1, a video signal synchronized with the video signal applied to the input terminal T1 is derived from the second video signal generation means 3, and is subjected to processing such as superimposition in the video signal processing circuit 4. is performed, and the signal is output to the input terminal T2.

Embodiment The drawing is a block diagram showing the configuration of a signal processing device 1 according to an embodiment of the present invention. A signal processing device 1 is provided in conjunction with a television receiver 2 and a computer 3 capable of creating graphic screens and the like. A video signal from a television receiver 2 and a video signal from a video signal recording/reproducing device (not shown) such as a video tape recorder are input to an input terminal T1 of the signal processing device 1 via a line 16. The video signal applied to the input terminal T1 is applied to a video signal processing circuit 4, a synchronization signal separation circuit 5, and a video signal detection circuit 6. The video signal processing circuit 4 receives a video signal supplied from the input terminal T1 and an RGB signal, which is a type of video signal supplied from the computer 3 via line l1 (in the following description, the video signal output from the computer 3 is referred to as the video signal output from the computer 3). unless otherwise specified.
Use RGB signal. ), for example, by superimposing them and supplying them as a single video signal to the output terminal T2 via the line l2.
a to the television receiver. In the synchronization signal separation circuit 5, a synchronization signal is separated from the input video signal and provided to the synchronization signal generation circuit 7. A vertical synchronizing signal is derived from the synchronizing signal generating circuit 7 via line l4, and a horizontal synchronizing signal is derived via line l5. Vertical sync signal via line l3 and directly or NOT from line l4
The horizontal synchronization signal via circuit 8 is sent to data selector 9
is input. The detection output of the video signal detection circuit 6 and a control signal from an operation setting means 10 for setting the operation state of the signal processing device 1 as described later are input to a selection signal generation circuit 12 including an OR gate 11. The selection signal from the selection signal generation circuit 12 is sent to the data selector 9 and the data selector 13.
is input. Data selector 9 has a switch
Includes SW1, SW2, SW3, and SW4. The individual switch S11 of the switch SW1 is connected to the horizontal synchronizing signal output terminal HO1 of the computer 3, and the individual terminal S12 is connected to the synchronizing signal generating circuit 7 via the line 15. The individual terminal S21 of the switch SW2 is the vertical signal output terminal of the computer 3.
connected to VO1, individual terminal S22 is connected to line l4
It is connected to the synchronization signal generation circuit 7 via. The individual terminal S31 of the switch SW3 is connected to the power supply terminal, and the individual terminal S32 is connected to the NOT circuit 8. Individual terminal S41 of switch SW4
is connected to the power supply terminal 2, and the individual terminal S42 is connected to the synchronization signal generation circuit 7 via the line l4. Common terminal S31 of switch SW1, common terminal S23 of switch SW2, common terminal S33 of switch SW3, common terminal S43 of switch SW4
are connected to the data selector 13, respectively. The data selector 13 includes switch SW5,
Switch SW6, Switch SW7 and Switch
Includes SW8. Individual terminal S of switch SW5
51 is the horizontal synchronization signal output terminal of computer 3
The individual terminal SO52 is connected to the common terminal S13 of the switch SW1 of the data selector 9. Individual terminal S6 of switch SW6
1 is the vertical synchronization signal output terminal VO of computer 3
1, and the individual terminal S62 is connected to the common terminal S23 of the switch SW2 of the data selector 9. The individual terminal S71 of the switch SW7 is the horizontal synchronization signal output terminal HO of the television receiver 2.
2, and the individual terminal S72 is connected to the NOT circuit 14.
It is connected to the common terminal S33 of the switch SW3 of the data selector 9 via. switch SW8
The individual terminal S81 is connected to the vertical synchronization signal output terminal VO2 of the television receiver 2.
82 is the data selector 9 via the NOT circuit 15
is connected to the common terminal S43. switch
The common terminal S53 of SW5 is the television receiver 2.
The common terminal S63 of the switch SW6 is connected to the vertical synchronizing signal input terminal VI2 of the television receiver 2,
The common terminal S73 of the switch SW7 is input to the horizontal synchronizing signal input terminal HI1 of the computer, and the common terminal S83 of the switch SW8 is connected to the vertical synchronizing signal input terminal VI1 of the computer 3, respectively. The switching operation of the data selector is performed by a selection signal from the selection signal generation circuit 12.

The operation of the signal processing device 1 having the above-described configuration is performed depending on the setting state of the operation setting means 10. When the RGB signal from the computer 3 and the video signal input from the terminal T1 are processed by the signal processing circuit 4, the synchronization signal is separated from the video signal input to the terminal T1, and the synchronization signal is sent to the computer. 3, and the RGB signal from the computer 3 must be derived to the signal processing circuit 4 based on the synchronization signal. For example, when the line l6 is disconnected from the input terminal T1, no video signal is input to the input terminal T1 of the signal processing device 1, and no detection signal is output from the video signal detection circuit 6, the selection signal generation circuit 12 outputs a low signal. A level signal is output, and the switches SW1 to SW8 of the data selectors 9 and 13 become conductive as shown in the drawing. In such a conductive state, the horizontal synchronizing signal from the computer 3 is sent from the output terminal HO1 to the switch SW of the data selector 13.
input terminal HI of television receiver 2 via 5
2 is input. The vertical synchronizing signal of the computer 3 is input from its output terminal VO1 to the input terminal VI2 of the television receiver 2 via the switch SW6 of the data selector 13. Also, the horizontal synchronizing signal from the television receiver 2 is output from its output terminal.
Switch SW7 of data selector 13 from HO2
The vertical synchronizing signal of the television receiver 2 is applied to the input terminal HI1 of the computer 3 via the data selector 13 from its output terminal VO2.
The signal is applied to the input terminal VI1 of the computer 3 via the switch SW8. from computer 3
When an image on the television receiver 2 is displayed using an RGB signal, a synchronization signal from the computer 3 is applied to the television receiver 2 through the path described above. When the RGB signal from the computer 3 is output from the output terminal T2 of the signal processing device 1 to a video tape recorder or the like, the synchronization signal from the television receiver 2 is input to the computer 3 through the path described above, and the synchronization The RGB signal is input to the signal processing circuit 4 according to the signal.

When a video signal is input to the input terminal T1 of the signal processing device 1 and an RGB signal is to be processed on the video signal, the video signal is detected by the video signal detection circuit 6, and its output becomes high level.
Since the output of the selection signal generation circuit 12 is at a high level, the conduction state of the data selectors 9 and 13 is opposite to that shown in the drawing. When the data selectors 9 and 13 are in this state, the horizontal synchronizing signal output from the synchronizing signal generating circuit 7 is transmitted to the input terminal HI2 of the television receiver 2 via the switch SW1 of the data selector 9 and the switch SW5 of the data selector 13. In addition to being input to
Switch SW of NOT circuit 8 and data selector 9
3. It is applied to the input terminal HI1 of the computer 3 via the NOT circuit 14 and the switch SW7 of the data selector 13. The vertical synchronization signal from the synchronization signal generation circuit 7 is sent to the switch of the data selector 9.
SW2 and data selector 13 switch SW
6 to the input terminal of the television receiver 2.
The signal is input to VI2 and is also applied to the input terminal VI1 of the computer 3 via the data selector switch SW4, the NOT circuit 15, and the data selector 13 switch SW8. When the video signal applied to the input terminal T1 of the signal processing device 1 and the RGB signal of the computer 3 are processed, the synchronization signal of the video signal applied to the input terminal T1 is sent to the computer 3 through the above-mentioned path. is input to the computer 3 based on the synchronization signal.
RGB signals are output from the signal processing circuit 4 to the signal processing circuit 4.
Based on the video signal given to the input terminal T1,
When an image is displayed on the television receiver 2, the synchronization signal of the video signal applied to the input terminal T1 is transmitted to the television receiver 2 through the above-mentioned path.
The image is displayed according to the synchronization signal. Remove line l6 from input terminal T1,
It is also possible to provide a video signal such as a reproduced video signal from another video signal generating means, for example a video tape recorder.

Effects As described above, according to the present invention, when no video signal is given to the input terminal T1 from the first video signal generation means 2 or other external circuit, the horizontal and vertical synchronization from the first video signal generation means 2 signal
HO2, VO2, data selector means 9, 13
The horizontal and vertical synchronizing signals from the first video signal generating means 2 are applied to the second video signal generating means 3 via the second video signal generating means 3.
A video signal synchronized with HO2 and VO2 is derived and is directly derived from the processing circuit 4 to the output terminal T2. Therefore, this output terminal T2 can be used for recording by the first video signal generating means 2, such as a video tape recorder of the NTSC system similar to the television receiver 2, or by a cathode ray tube or the like. It can be easily displayed depending on the display means used.

Further, according to the present invention, when a video signal is applied to the input terminal T1 from the first video signal generating means 2 or other external circuit, the input terminal T1
The vertical and horizontal synchronizing signals H and V contained in the video signal given to the data selector means 9 and 1
3 to the second video signal generating means 3, and this second video signal generating means 3 is supplied to the input terminal T1.
The processing circuit 4 derives the video signal in synchronization with the horizontal and vertical synchronization signals H and V of the video signal given to the
In this way, the processing circuit 4 performs processing such as superimposing the video signal applied to the input terminal T1 and the video signal from the second video signal generation means 3 synchronized therewith, and outputs the resultant signal to the output terminal T2. do.

Thus, according to the present invention, the video detection circuit 6 detects whether or not a video signal is applied to the output terminal T1, and the data selector means 9, 13
It operates automatically and is extremely easy to operate.

[Brief explanation of drawings]

The drawing is a block diagram showing the configuration of a signal processing device 1 according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Signal processing device, 2...Television receiver, 3...Computer, 4...Video signal processing circuit, 5...Synchronization signal separation circuit, 6...Video signal detection circuit, 7...Synchronization signal generation Circuit, 9, 13...
Data selector, 10...Operation setting means, 12...
...Selection signal generation circuit.

Claims (1)

[Claims for Utility Model Registration] An input terminal T1, and a first video signal generating means 2 which may or may not apply a first video signal to the input terminal T1, the first video signal generating means 2 comprising: , the video signal and the horizontal synchronization signal HO included in the video signal
2 and the vertical synchronization signal VO included in the video signal.
2, a horizontal synchronizing signal input terminal HI1 and a vertical synchronizing signal input terminal VI1, the horizontal synchronizing signal input terminal HI
a second video signal generating means 3 for deriving a second video signal synchronized with the horizontal synchronizing signal input from VI1 and the vertical synchronizing signal input from the vertical synchronizing signal input terminal VI1; an output terminal T2; and an input terminal T1. When a video signal is applied to the input terminal T1, the video signal applied to the input terminal T1 and the video signal from the second video signal generation means 3 are processed and output to the output terminal T2, and the video signal is input to the input terminal T1. is not provided, a video signal processing circuit 4 that outputs the video signal from the second video signal generating means 3 as it is to the output terminal T2;
synchronization signal separation detection means 5, 6 for separating and deriving the horizontal synchronization signal H and vertical synchronization signal V included in the video signal from the input terminal T1; and detecting that the video signal is applied to the input terminal T1. In response to the output of the video detection circuit 6, the input terminal T1
When a video signal is given to the second video signal generating means 3, the horizontal synchronizing signal H from the synchronizing signal separation detecting means 5, 7 is applied to the horizontal synchronizing signal input terminal HI1 of the second video signal generating means 3, and the synchronizing signal separating detecting means 5, The vertical synchronizing signal V from 7 is applied to the vertical synchronizing signal input terminal VI1 of the second video signal generating means 3, and the vertical synchronizing signal V from input terminal T
1, the horizontal synchronizing signal HO2 from the first video signal generating means 2 is applied to the second video signal generating means 2.
Horizontal synchronization signal input terminal HI of video signal generation means 3
1, and data selector means 9, 13 for supplying the vertical synchronizing signal VO2 from the first video signal generating means 2 to the vertical synchronizing signal input terminal VI1 of the second video signal generating means 3. Signal processing device.