CN201986082U - Video signal detection circuit and television - Google Patents
Video signal detection circuit and television Download PDFInfo
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- CN201986082U CN201986082U CN2010205175014U CN201020517501U CN201986082U CN 201986082 U CN201986082 U CN 201986082U CN 2010205175014 U CN2010205175014 U CN 2010205175014U CN 201020517501 U CN201020517501 U CN 201020517501U CN 201986082 U CN201986082 U CN 201986082U
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Abstract
The utility model discloses a video signal detection circuit and a television. The video signal detection circuit comprises a video signal detection terminal, a detection signal output terminal, a voltage division resistance network unit and a power supply unit, wherein the power supply unit supplies electricity to the voltage division resistance network unit, one voltage division end of the voltage resistance network unit is connected with the detection signal output terminal, and the video signal detection terminal is connected with a voltage division end of the voltage division resistance network unit or a power supply terminal of the power supply unit. When signals are accessed and not accessed into the circuit through a video signal interface, different level signals are output on the voltage division end of the voltage division resistance network for automatically identifying the connecting state of the video signal interface, and the video signal detection is realized.
Description
Technical field
The utility model relates to the signal detection technique field, specifically, relates to a kind of be used to detect video signal detection circuit that whether has vision signal and the television set with this testing circuit.
Background technology
In television set and other video display apparatus, use for the convenience of the user, generally all can dispose the multi-channel video signal interface, form the multi-channel video signal passage.With the television devices is example, and at present, the video signal interface of its configuration has generally included:
1 road S terminal, S terminal are meant the interface that can input or output Y-signal and C signal, can improve image definition;
1 to 3 tunnel AV terminal, AV terminal are meant many group audio frequency, video input/output interface;
1 to 3 road YPBPR high definition interfaces, the effect of YPBPR high definition interface are with the brightness signal Y of simulation, color difference signal PB, PR etc. separately, use three cable independent transmission, ensure the accuracy of color rendition;
1 to 3 road HDMI interfaces, HDMI interface are the high-definition media interfaces of a supporting industry, non-compression, digital video and audio frequency.
In the television set of the above-mentioned multi-channel video signal interface of configuration, for reduce the button of remote controller or this machine of television set as far as possible, generally be to be used between various vision signals, circulating and to select to realize the switching of different video signal, or adopt and access the video choice menus, switch between the different video signal according to arranging good order in the menu then by setting a button.But in actual application, the actual channel video signal that often uses of user just wherein 1 the tunnel, in the time of many also with regard to 2 to 3 the tunnel.Because television set passage configuration, that can be used for selecting is more, therefore, the operation that in most of the cases will choose correct channel video signal is normally more loaded down with trivial details, reduced television product ease of use, reduced user's experience comfort level.
Summary of the invention
One of the purpose of this utility model is to provide a kind of video signal detection circuit, this circuit insert by video signal interface and when not inserting signal on the branch pressure side of resistor voltage divider network the different level signal of output come the connection status of video signal interface is discerned automatically the detection of realization vision signal.
For realizing above-mentioned technical purpose, the utility model is achieved by the following technical solutions:
A kind of video signal detection circuit, comprise video signal detection terminal, detection signal lead-out terminal and resistor voltage divider network unit and be the power supply unit of this resistor voltage divider network unit power supply, a branch pressure side of resistor voltage divider network unit connects described detection signal lead-out terminal, and described video signal detection terminal connects a branch pressure side of described resistor voltage divider network unit or connects the power supply terminal of described power supply unit.
If video signal interface difference to be detected, concrete line is distinguished to some extent, and is specific as follows:
If video signal interface to be detected is the AV interface, definition according to the AV interface, described video signal detection terminal connects a branch pressure side of described resistor voltage divider network unit on the one hand, connects the control pin in video signal input terminal of AV interface on the other hand.
If video signal interface to be detected is the YPBPR interface, characteristics according to the YPBPR interface, described video signal detection terminal connects a branch pressure side of described resistor voltage divider network unit on the one hand, connects the control pin in the luminance signal input terminal of YPBPR interface on the other hand.
If video signal interface to be detected is the HDMI interface because HDMI interface structure problem does not have spendable mechanical switch pin, according to its interface definition, described video signal detection terminal can be connected to the HDMI interface+the 5V pin.
If video signal interface to be detected is the S terminal, according to the design feature of S terminal, described video signal detection terminal connects a branch pressure side of described resistor voltage divider network unit on the one hand, connects the control reed pin of S terminal on the other hand.
Aforesaid video signal detection circuit has influence on follow-up circuit for avoiding vision signal by the detection signal lead-out terminal, and described detection signal lead-out terminal also is connected with the buffer circuit that the interference component in the vision signal and flip-flop are isolated.
Preferably, described buffer circuit includes piezo-resistance and electric capacity in parallel, and piezo-resistance is used for eliminating the interference component of vision signal, and electric capacity is used for isolating the flip-flop in the vision signal.
Two of the purpose of this utility model provides a kind of television set, be provided with the video signal detection circuit in this television set, and testing circuit is arranged between video signal interface and the microprocessor, by microprocessor the connection status of each video signal interface is discerned automatically, the video signal interface of ignoring the no signal input, thereby simplify selection, the handoff procedure of channel video signal, improve the comfort level that the user uses.
Specifically, the television set that is provided comprises video signal interface and microprocessor, between video signal interface and microprocessor, be provided with above-mentioned video signal detection circuit, wherein, the video signal detection terminal of video signal detection circuit connects video signal interface to be detected, and the detection signal lead-out terminal of video signal detection circuit is connected to the I/O mouth of described microprocessor.
Compared with prior art, advantage of the present utility model and good effect are: the video signal detection circuit that the utility model proposes is by being provided with resistor voltage divider network unit and power supply unit, and divider resistance resistance in the resistor voltage divider network is set rationally, make the video signal interface to be detected be connected with the video signal detection circuit export the detection signal of corresponding varying level signal respectively at incoming video signal with when not inserting signal, utilize this detection signal directly to judge, identify the connection status of video signal interface, realize whether incoming video signal detects.If be applied in the video display apparatus of configuration such as television set multi-channel video signal interface, then detection signal can be transferred in the microprocessor of main frame, automatically the connection status of each video signal interface is discerned, ignore the video signal interface that is not connected with peripheral hardware, thus make channel video signal selection, switch more convenient.
After reading embodiment of the present utility model in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the circuit theory diagrams of an embodiment of the utility model video signal detection circuit;
Fig. 2 is the circuit theory diagrams of another embodiment of the utility model video signal detection circuit;
Fig. 3 is the circuit connection diagram of two embodiment using in television set of the utility model video signal detection circuit;
Fig. 4 is the circuit connection diagram of two embodiment in addition that the utility model video signal detection circuit is used in television set.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
The utility model is from point of practical use, consider video display apparatus configuration multi-channel video signal interfaces such as existing television set, only be wherein 1 or two and the user often uses, switch the awkward problem that exists thereby cause the user to circulate between whole a plurality of video signal interfaces through being everlasting, a kind of video signal detection circuit is provided, making main process equipment utilize this testing circuit to detect which or which video signal interface automatically is connected with peripheral hardware and exists vision signal, which or which video signal interface not to connect peripheral hardware, there is not vision signal.So, if detected the vision signal input, then can directly enter this channel; If detected a plurality of interfaces the signal input is arranged all, then only between these several interfaces, change, neglect the interface of no signal input, thereby simplified the handover operation between unlike signal greatly, user-friendly.
Fig. 1 and Fig. 2 show the circuit theory diagrams of two embodiment of the utility model video signal detection circuit respectively.
As shown in Figure 1, the video signal detection circuit of this embodiment comprises video signal detection terminal a, detection signal lead-out terminal b, comprises that also the resistor voltage divider network unit that resistance r1 and resistance r2 constitute reaches power supply unit VCC and the GND that powers for this resistor voltage divider network unit.Wherein, a branch pressure side c joint detection signal output terminal b between divider resistance r1 and the divider resistance r2, and video signal detection terminal a also is connected on this minute pressure side c.
The basic functional principle of this embodiment is as follows: the prevention of divider resistance r1 and divider resistance r2 rationally is set, and video signal detection terminal a is connected to video signal interface to be detected.When this interface incoming video signal, in minute level signal of pressure side c output, the signal output terminal b output after testing of this signal; And when this interface does not connect vision signal, branch pressure side c will export a level signal that is different from above-mentioned situation, the signal output terminal b output after testing of this signal.By judging the varying level signal of detection signal lead-out terminal b output, can detect video signal interface and whether have access to vision signal, realize the purpose of video signal detection.
Figure 2 shows that the circuit theory diagrams of another embodiment of video signal detection circuit.Identical with Fig. 1 embodiment, the video signal detection circuit of this embodiment also comprises video signal detection terminal a, detection signal lead-out terminal b, comprises that also the resistor voltage divider network unit that resistance r1 and resistance r2 constitute reaches power supply unit VCC and the GND that powers for this resistor voltage divider network unit.Wherein, a branch pressure side c joint detection signal output terminal b between divider resistance r1 and the divider resistance r2.And be that with Fig. 1 embodiment difference the video signal detection terminal a among Fig. 2 embodiment is connected on the VCC power supply terminal of power supply unit.
Therefore, the operation principle of this embodiment is slightly different with Fig. 1 embodiment, be specially: the video signal detection terminal a that is used to connect video signal interface to be detected is connected to the VCC power supply terminal of power supply unit, when video signal interface to be detected has signal to insert with the no signal access, the VCC power supply terminal will exist provides or does not provide resistor voltage divider network working power two states, thereby make and divide pressure side c will export two kinds of different level signals, the signal output terminal b output after testing of this level signal is as detecting the detection foundation whether video signal interface has access to vision signal.
Need to prove that divider resistance r1 among Fig. 1 and Fig. 2 or divider resistance r2 may not only include 1 resistance, also can be the equivalent resistance of a plurality of resistance.
The concrete in actual applications video signal detection circuit of selecting above-mentioned which kind of principle can specifically be selected according to the structure and the pinout of video signal interface.Be example with the television set below, introduce several application examples that adopt different video signal detection circuit at the different video signaling interface in detail.
Figure 3 shows that the circuit connection diagram of two embodiment that the utility model video signal detection circuit is used in television set; Fig. 4 is its circuit connection diagram of two embodiment in addition of using in television set.
At first referring to Fig. 3, the television set in this circuit connection diagram illustrated embodiment includes AV interface AV1 and YPBPR interface HDTV1, also includes microprocessor CPU.
According to the design feature of AV interface,, and be that this resistor voltage divider network unit powers+the 5V power supply for it disposes the resistor voltage divider network unit that resistance R 5, R1 and R11 constitute.Wherein, one end ground connection of resistance R 11, its other end is as a minute pressure side, on the one hand draw the video signal detection terminal and be connected to control pin 3 among the sub-CVBS of video signal input terminal (yellow terminal) of AV interface, draw the detection signal lead-out terminal on the other hand and be connected to the I/O pin I/O1 of CPU.
The operation principle of foregoing circuit is as follows: the resistance of reasonable disposition resistance R 5, R1 and R11 at first.When the AV1 interface does not connect vision signal, the vision signal input pin 1 of the sub-CVBS of its video signal input terminal and 3 short circuits of control pin, + 5V supply voltage is after resistance R 5, R1 and R11 dividing potential drop, for the I/O1 pin of CPU provides a low level signal, CPU judges that according to this low level signal the AV1 interface does not have the input of video signal.When the AV1 interface is connected with the vision signal input, the vision signal input pin 1 of the sub-CVBS of its video signal input terminal and control pin 3 disconnect, + 5V supply voltage is after resistance R 5 and R11 dividing potential drop, for the I/O1 pin of CPU provides a high level signal, CPU judges AV1 interface incoming video signal according to this high level signal.
For the HDTV1 interface, its interface structure and AV1 are similar, therefore, for it disposes resistance R 4, R2 and R12 resistor voltage divider network unit, and are that this resistor voltage divider network unit powers+the 5V power supply.Wherein, one end ground connection of resistance R 12, its other end is as a minute pressure side, on the one hand draw the video signal detection terminal and be connected to control pin 3 among the luminance signal input terminal HDTV1_GIN+ (green terminal) of HDTV1 interface, draw the detection signal lead-out terminal on the other hand and be connected to the I/O pin I/O2 of CPU.
The operation principle of foregoing circuit is similar to the detection principle of AV1 interface, is specially: the resistance of reasonable disposition resistance R 4, R2 and R12 at first.When the HDTV1 interface does not connect vision signal, the luminance signal input pin 1 of its luminance signal input terminal HDTV1_GIN+ and 3 short circuits of control pin, + 5V supply voltage is after resistance R 4, R2 and R12 dividing potential drop, for the I/O2 pin of CPU provides a low level signal, CPU judges that according to this low level signal the HDTV1 interface does not have the input of video signal.When the HDTV1 interface is connected with the vision signal input, the luminance signal input pin 1 of its luminance signal input terminal HDTV1_GIN+ and control pin 3 disconnect, + 5V supply voltage is after resistance R 4 and R12 dividing potential drop, for the I/O2 pin of CPU provides a high level signal, CPU judges HDTV1 interface incoming video signal according to this high level signal.
In Fig. 3 circuit diagram, because the AV1 interface is when incoming video signal, its video signal input terminal is connected with the buffer circuit of piezo-resistance VD1 and capacitor C 1 formation, in addition testing circuit used+the 5V power supply is the in-line power of television set, disturb less, can not damage the I/O pin of CPU, therefore, can be that I/O1 pin place additionally connects buffer circuit at the detection signal lead-out terminal.Certainly, also this buffer circuit can be set again, to play further protection to CPU.Also there is analogue for the HDTV1 interface, repeats no more.
Referring to the circuit connection diagram of two embodiment shown in Fig. 4, the television set in this circuit connection diagram illustrated embodiment includes HDMI interface, S port S_VIDEO and microprocessor CPU.
For the HDMI interface, because the interface structure problem does not have spendable mechanical switch pin in it, but according to its interface definition, under the peripheral hardware open state that connects, its+5V pin output+5V voltage, and when the peripheral hardware shutdown that connects, this pin output voltage is 0.According to these characteristics, for the HDMI interface configuration resistor voltage divider network unit that constitutes of resistance R 10, R6 and R7.Wherein, resistance R 6 one end ground connection, its other end is as a minute pressure side, draws the detection signal lead-out terminal and is connected to the I/O pin I/O of CPU by resistance R 7.And the video signal detection terminal is connected to HDMI interface+5V pin, and this pin also uses as the power supply terminal of the power supply unit of powering for the resistor voltage divider network unit simultaneously.
The operation principle of foregoing circuit is: the resistance of reasonable disposition resistance R 10, R6 and R7 at first.When the vision signal input is started shooting, also promptly had to the peripheral hardware that the HDMI interface connects, the HDMI interface+5V pin output+5V high voltage, this voltage is by after resistance R 10, R6 and the R7 dividing potential drop, for the I/O3 pin of CPU provides a high level signal, CPU judges HDMI interface incoming video signal according to this high level signal.And outside this interface does not connect if under the peripheral hardware off-mode, the HDMI interface+the 5V pin is output as 0, and for the I/O3 pin of CPU provides a low level signal, CPU judges that according to this low level signal the HDMI interface does not have incoming video signal.
In HDMI interface testing process,, be easy to generate and disturb and infringement CPU because CPU directly is connected with the voltage signal that vision signal provides.Be protection CPU, this embodiment is parallel with the buffer circuit of piezo-resistance VD4 and capacitor C 5 formations at resistance R 6 two ends, and wherein, piezo-resistance VD4 is used for eliminating the interference component in the vision signal, and capacitor C 5 is used for isolating the flip-flop in the vision signal.
For S port S_VIDEO, as shown in Figure 4, this interface includes control reed pin 2.When the S port does not have the input of video signal, these pin 2 open circuits; When the S port had the vision signal input, this pin linked to each other with the earth terminal of port.According to these characteristics, for the S port arrangement resistor voltage divider network that constitutes of resistance R 9 and R8 and be its power supply+the 5V power supply.Wherein, an end ground connection of resistance R 8, its other end is as a minute pressure side, draws the video signal detection terminal on the one hand and is connected to the control reed pin 2 of S port, draws the detection signal lead-out terminal on the other hand and is connected to the I/O pin I/O4 of CPU.
The operation principle of foregoing circuit is specific as follows: at first, and the resistance of reasonable disposition resistance R 9 and R8.Do not have vision signal when input at the S port, control reed pin 2 open circuits ,+5V supply voltage are after resistance R 9 and R8 dividing potential drop, and for the I/O4 pin of CPU provides a high level signal, CPU judges that according to this high level signal the S port does not have the input of video signal.When the S port has the vision signal input, control reed pin 2 is connected with the earth terminal of port, + 5V supply voltage is after resistance R 9 and R8 dividing potential drop, and for the I/O4 pin of CPU provides a low level signal, CPU judges that according to low high level signal the S port has the vision signal input.
In S port video signal detection process; owing to when having vision signal to insert, will introduce the earth signal of vision signal itself; for protection CPU avoids damaging; this embodiment is parallel with the buffer circuit of piezo-resistance VD3 and capacitor C 8 formations at resistance R 8 two ends; wherein; piezo-resistance VD3 is used for eliminating the interference component in the vision signal, and capacitor C 8 is used for isolating the flip-flop in the vision signal.
Above embodiment only in order to the explanation the technical solution of the utility model, but not limits it; Although the utility model is had been described in detail with reference to previous embodiment, for the person of ordinary skill of the art, still can make amendment to the technical scheme that previous embodiment is put down in writing, perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of the utility model technical scheme required for protection.
Claims (10)
1. video signal detection circuit, it is characterized in that, comprise video signal detection terminal, detection signal lead-out terminal and resistor voltage divider network unit and be the power supply unit of this resistor voltage divider network unit power supply, a branch pressure side of resistor voltage divider network unit connects described detection signal lead-out terminal, and described video signal detection terminal connects a branch pressure side of described resistor voltage divider network unit or connects the power supply terminal of described power supply unit.
2. video signal detection circuit according to claim 1, it is characterized in that, video signal interface to be detected is the AV interface, described video signal detection terminal connects a branch pressure side of described resistor voltage divider network unit on the one hand, connects the control pin in video signal input terminal of AV interface on the other hand.
3. video signal detection circuit according to claim 1, it is characterized in that, video signal interface to be detected is the YPBPR interface, described video signal detection terminal connects a branch pressure side of described resistor voltage divider network unit on the one hand, connects the control pin in the luminance signal input terminal of YPBPR interface on the other hand.
4. according to claim 2 or 3 described video signal detection circuit, it is characterized in that described detection signal lead-out terminal also is connected with the buffer circuit that the interference component in the vision signal and flip-flop are isolated.
5. video signal detection circuit according to claim 1 is characterized in that, video signal interface to be detected is the HDMI interface, described video signal detection terminal connection HDMI interface+the 5V pin.
6. video signal detection circuit according to claim 5 is characterized in that, described detection signal lead-out terminal also is connected with the buffer circuit that the interference component in the vision signal and flip-flop are isolated.
7. video signal detection circuit according to claim 1, it is characterized in that, video signal interface to be detected is the S terminal, and described video signal detection terminal connects a branch pressure side of described resistor voltage divider network unit on the one hand, connects the control reed pin of S terminal on the other hand.
8. video signal detection circuit according to claim 7 is characterized in that, described detection signal lead-out terminal also is connected with the buffer circuit that the interference component in the vision signal and flip-flop are isolated.
9. according to claim 6 or 8 described video signal detection circuit, it is characterized in that described buffer circuit includes piezo-resistance and electric capacity in parallel.
10. television set, comprise video signal interface and microprocessor, it is characterized in that, also comprise each described video signal detection circuit in the aforesaid right requirement 1 to 9, wherein, the video signal detection terminal of video signal detection circuit connects video signal interface to be detected, and the detection signal lead-out terminal of video signal detection circuit is connected to the I/O mouth of described microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205175014U CN201986082U (en) | 2010-08-31 | 2010-08-31 | Video signal detection circuit and television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205175014U CN201986082U (en) | 2010-08-31 | 2010-08-31 | Video signal detection circuit and television |
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| CN201986082U true CN201986082U (en) | 2011-09-21 |
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| CN2010205175014U Expired - Fee Related CN201986082U (en) | 2010-08-31 | 2010-08-31 | Video signal detection circuit and television |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109068132A (en) * | 2018-08-22 | 2018-12-21 | 广州视源电子科技股份有限公司 | A kind of test method, device, equipment and the storage medium of VBO display interface |
-
2010
- 2010-08-31 CN CN2010205175014U patent/CN201986082U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109068132A (en) * | 2018-08-22 | 2018-12-21 | 广州视源电子科技股份有限公司 | A kind of test method, device, equipment and the storage medium of VBO display interface |
| CN109068132B (en) * | 2018-08-22 | 2020-05-12 | 广州视源电子科技股份有限公司 | VBO display interface test method, device, equipment and storage medium |
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Granted publication date: 20110921 Termination date: 20130831 |