CN101277403B - Circuit and method for switching video signal of digital television receiver - Google Patents
Circuit and method for switching video signal of digital television receiver Download PDFInfo
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- CN101277403B CN101277403B CN2008100665387A CN200810066538A CN101277403B CN 101277403 B CN101277403 B CN 101277403B CN 2008100665387 A CN2008100665387 A CN 2008100665387A CN 200810066538 A CN200810066538 A CN 200810066538A CN 101277403 B CN101277403 B CN 101277403B
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Abstract
The invention is suitable for digital television field, providing a video signal switching circuit of a digital television receiving set, comprising: a video output chip, at least one video output terminal, the video output chip comprises a video signal output terminal and a input/output terminal, the video signal output is connected with the video output terminal. The video signal switching circuit of a digital television receiving set also comprises a detecting circuit, the input terminal of the detecting circuit and the video output terminal are connected with video signal output terminal of the video output chip, the output terminal of the detecting circuit is connected with the input/output terminal of the video output chip. By detecting whether a first video output terminal connected with the detecting circuit is connected with load, the invention can determine the format of video signal to be outputted by the video signal output terminal, in order to realize intelligent switching process on video signals in different format. The technical scheme is simple with low costs.
Description
Technical field
The invention belongs to digital TV field, relate in particular to a kind of video signal of digital television receiver commutation circuit and method.
Background technology
Along with China's constant development of economy, people's living standard improves gradually, and the thing followed is higher inspirit culture demand.2008 Beijing Olympic Games at hand, the current Olympic Games will be carried out omnidistance digital live broadcast, digital television receiver seems particularly important in this process.Also be not equipped with under the situation of Digital Television in most of families, can come receiving digital signals to obtain clear more picture more true to nature and sound, make and see that TV becomes the enjoyment of a kind of people's of the satisfying vision and the sense of hearing by digital television receiver.
For the various television sets before the compatibility, digital television receiver has been reserved various audio-video signal interfaces, and the interface of wherein existing output high-definition video signal also has the interface of outputting standard definition vision signal.But because the restriction of the aspects such as volume, pin number and function of master chip, the VT mouth of high definition, SD form is multiplexing common IO mouth on the existing digital television receiver.That is to say, can only export a kind of vision signal of form at one time.For example, on existing high-definition digital television receiver, on three common IO mouths, though they all have different separately lead-out terminals, can only there be a kind of signal output the same time to the rgb signal of the YPbPr signal of support high-definition format and support SD form with regard to multiplexing.
Addressing this problem on digital television receiver has two kinds of selections, first: only export a kind of signal, second usually: if two kinds of signals are just all exported need switch mutually.Technical scheme on the existing digital television receiver comprises three kinds of technical schemes:
First kind of technical scheme: only do a kind of signal output, another kind of signal is not thoroughly exported;
Second kind of technical scheme: two kinds of signal output functions are all done, but great majority are to do an option by software in menu when doing switching, are switched by the user;
The third technical scheme:, come manual switchover by the user by outside digital television receiver, increasing the switch that a signal switches.
But above-mentioned three technical schemes all have shortcoming separately:
For first kind of technical scheme, shortcoming is conspicuous.Use the digital television receiver of this scheme can only have a kind of vision signal of form to export, lack than other digital television receivers on function, this has just avoided problem and has not dealt with problems;
For second kind of technical scheme, shortcoming also clearly.For the user of great majority use digital television receiver, the various vision signals that want to distinguish one from the other are that the high-definition video signal or the vision signal of single-definition are not a thing easily.If the user has only inserted a kind of holding wire of terminal, switch to another kind of output signal this moment, will occur not having signal output allow the result of television set blank screen like this, and using to the user makes troubles.Even two kinds of holding wires have all been inserted, but the user also will find the option of this switching to select oneself to want the video format of seeing in menu, and is also inconvenient;
Need be for the third technical scheme at hardware selector switch of the outside increase of digital television receiver, each user is doing the manual switchover of will standing up when signal switches, and is very inconvenient, in addition, can cause the cost of digital television receiver to increase.
Therefore, need provide a kind of new video signal of digital television receiver commutation circuit, to solve the problem in above-mentioned three kinds of technical schemes, promptly vision signal is switched inconvenient, the too high problem of digital television receiver cost.
Summary of the invention
The object of the present invention is to provide a kind of video signal of digital television receiver commutation circuit and method, be intended to solve existing digital television receiver when VT is carried out signal multiplexing, video signal of digital television receiver switches inconvenience, increases the problem of digital television receiver cost.
The invention provides a kind of video signal of digital television receiver commutation circuit, comprise video pio chip, at least one video output terminal, described video pio chip comprises VT and input/output port, and described VT connects video output terminal.The video signal of digital television receiver commutation circuit also comprises testing circuit, the input of described testing circuit and described video output terminal all are connected to the VT of video pio chip, and described testing circuit output links to each other with the input/output port of video pio chip.
Technical scheme of the present invention also comprises: described video output terminal of the present invention comprises first video output terminal and second video output terminal, described VT connects first video output terminal and second video output terminal, and described testing circuit input is connected with first video output terminal with VT.
Technical scheme of the present invention also comprises: video signal of digital television receiver commutation circuit of the present invention also comprises the 7th resistance, and described the 7th resistance one end connects described VT, and the other end connects the second video output terminal input.
Technical scheme of the present invention also comprises: video signal of digital television receiver commutation circuit of the present invention also comprises the 8th resistance, described the 8th resistance one end connects described VT, and the other end connects first video output terminal and testing circuit input.
Technical scheme of the present invention also comprises: video signal of digital television receiver commutation circuit of the present invention also comprises the 9th resistance, and described the 9th resistance one end connects described input/output port, other end connection detection circuit output.
Technical scheme of the present invention also comprises: described testing circuit comprises first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, electric capacity, first triode, second triode, one end of described first resistance connects first video output terminal, the other end links to each other with first transistor base with electric capacity respectively, the collector electrode of described first triode links to each other with the 3rd resistance with second resistance respectively, the emitter of described first triode links to each other with the 5th resistance with the 4th resistance respectively, the other end of described the 4th resistance links to each other with second transistor base, described second transistor collector links to each other with the chip input/output port, the described second resistance other end links to each other electric capacity by the 6th resistance with the chip input/output port, the 3rd resistance, the emitter of the 5th resistance and second triode is ground connection respectively.
Another embodiment provided by the invention is: a kind of video signal of digital television receiver changing method, said method comprising the steps of: steps A: from a plurality of video output terminals, select a video output terminal as detection terminal, described a plurality of video output terminal comprises first video output terminal and second video output terminal, at the VT increase testing circuit of video pio chip; Step B: voltage or current signal that testing circuit detects described video output terminal as detection terminal change, and detected variation are input to the input/output port of video pio chip; Step C: video pio chip scanning input/output port monitors signal to be changed, and judges whether described video output terminal as detection terminal has load to insert; And step D: insert load if the video pio chip detects described video output terminal as detection terminal, from the described user-selected vision signal of video output terminal output as detection terminal.
Technical scheme of the present invention also comprises: in described steps A, select first video output terminal as detection terminal.
Technical scheme of the present invention also comprises: in described step D, the video pio chip detects described first video output terminal and inserts load, exports the signal of first video output terminal.
Technical scheme of the present invention also comprises: in described step D, the video pio chip detects first video output terminal and does not insert load, exports the signal of second video output terminal.
The present invention detects the variation that connects load front and back voltage or electric current on first video output terminal by testing circuit, by testing circuit this variation is converted to detection signal and inputs to the video pio chip, judge and export the vision signal of corresponding format by video output terminals by the video pio chip, promptly when the user when patching the holding wire of digital television receiver first video output terminal, digital television receiver can be judged the vision signal of also exporting automatically with the corresponding form of first video output terminal by testing circuit, the intelligence that realizes the different-format vision signal is switched, and more existing various technical schemes have easier, advantage more cheaply.
Description of drawings
Fig. 1 is the theory diagram of the video signal of digital television receiver commutation circuit of the embodiment of the invention;
Fig. 2 is the circuit diagram of testing circuit in the video signal of digital television receiver commutation circuit of the embodiment of the invention;
Fig. 3 is the flow chart of the video signal of digital television receiver changing method of the embodiment of the invention.
Embodiment
See also Fig. 1, be the theory diagram of the video signal of digital television receiver commutation circuit of the embodiment of the invention.The video signal of digital television receiver commutation circuit of the embodiment of the invention comprises video pio chip 100, first video output terminal 130, second video output terminal 140, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9 and testing circuit 200.This video pio chip 100 comprises VT 110, input and output (IO) port one 20, first video output terminal 130 links to each other with VT 110 by the 8th resistance R 8, second video output terminal 140 also links to each other with VT 110 by the 7th resistance R 7, testing circuit 200 1 ends are connected between first video output terminal 130 and the 8th resistance R 8, and testing circuit 200 other ends link to each other with input/output port 120 by the 9th resistance R 9.This testing circuit 200 is used for detecting voltage or the current signal that video format 1 signal output part connects before and after the load to be changed, and by the PNP transistor switching circuit in the testing circuit 200 variation of this detection signal is input to input/output port 120.Video pio chip 100 monitors change in detection signal by scanning input/output port 120 and judged afterwards that whether this signal output part has load to insert, and determined the form of output corresponding signal according to judged result.That is, inserted load if detect video format 1 by detection signal, the signal of output video form 1 then is not if insert load then the signal of output video form 2.
The operation principle of the video signal of digital television receiver commutation circuit of the embodiment of the invention illustrates by a high definition YPbPr signal and a SD rgb signal intelligence handoff technique scheme that is applied to high-definition digital television receiver.
Because the high definition YPbPr signal of high-definition digital television receiver and SD rgb signal three the common signal outputs that are multiplexing video pio chip 100, suppose that high definition YPbPr signal is video pio chip 100 and outputs to video format 1 signal on first video output terminal 130 through the 8th resistance R 8; To be video pio chip 100 output to video format 2 signals on second video output terminal 140 through the 7th resistance R 7 to the SD rgb signal.Because digital television receiver has two multiplexing common input/output ports 120 of video format, therefore, first video output terminal 130 of selecting video format 1 is as detection terminal.The same time of high-definition digital television receiver can only be exported wherein a kind of signal, increases a testing circuit 200 on the signal output part of video format 1.This testing circuit 200 is used for detecting voltage or the current signal that video format 1 signal output part connects before and after the load to be changed, and by the PNP transistor switching circuit in the testing circuit 200 variation of this detection signal is input to input/output port 120.Video pio chip 100 monitors change in detection signal by scanning input/output port 120 and judged afterwards that whether this signal output part has load to insert, and determined the form of output corresponding signal according to judged result.That is, inserted load if detect video format 1 by detection signal, the signal of output video form 1 then is not if insert load then the signal of output video form 2.
So just accomplished that when the user is connected television set with the video output terminals of certain form digital television receiver can switch to this video format output that inserts load automatically.
See also Fig. 2, be the circuit diagram of testing circuit in the video signal of digital television receiver commutation circuit of the embodiment of the invention.The testing circuit of present embodiment comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, capacitor C 1, a PNP triode Q1, the 2nd PNP triode Q2.These first resistance R, 1 one ends are connected among Fig. 1 between the 8th resistance R 8 and first video output terminal 130, the other end of this first resistance R 1 links to each other with a PNP triode Q1 base stage with capacitor C 1 respectively, the collector electrode of the one PNP triode Q1 links to each other with the 3rd resistance R 3 with second resistance R 2 respectively, the other end of second resistance R 2 links to each other with the 9th resistance R 9 by the 6th resistance R 6, the emitter of the one PNP triode Q1 links to each other with the 5th resistance R 5 with the 4th resistance R 4 respectively, the other end of the 4th resistance R 4 links to each other with the 2nd PNP triode Q2 base stage, the 2nd PNP triode Q2 collector electrode links to each other capacitor C 1 with the 9th resistance R 9, the 3rd resistance R 3, the emitter of the 5th resistance R 5 and the 2nd PNP triode Q2 is ground connection respectively.
During start, video pio chip 100 just comes to determine the form of output signal by the level of scanning detection output signal pin.If do not connect load on the lead-out terminal of video format 1 signal during start, just do not connect television set, level on this signal is a higher level V0 (V0 is unloaded level) so, this moment as shown in Figure 2, the one PNP triode Q1 is because the base stage level is higher, and a PNP triode Q1 ends; The base stage that causes the 2nd PNP triode Q2 is a low level, and the 2nd PNP triode Q2 also ends, so the detection output pin of this moment is a high level; Video pio chip 100 can confirm that by the level of detection chip input/output port first video output terminal 130 does not connect television set, continues the signal of output video form 2.
If the user wants with video format 1 signal TV programme, when the user inserts first video output terminal 130, the terminal that is equivalent to video format 1 signal has connect load, level on this signal becomes V1 (V1=V0/2) by V0, this moment the PNP triode Q1 base stage level step-down among Fig. 2, be lower than an emitter level 0.6V PNP triode Q1 conducting later on, the one PNP triode Q1 collector voltage is raise, act on the 2nd NPN triode Q2 by the 4th resistance R 4, make the 2nd NPN triode Q2 conducting, become low level so detect output signal; When detecting, video pio chip 100 detects the output signal step-down later on regard to output video form 1 signal.If switch back the signal output mode of original video format 2, only need be extracted first video output terminal 130 and get final product.
See also Fig. 3, be the flow chart of the video signal of digital television receiver changing method of the embodiment of the invention.The video signal of digital television receiver changing method of the embodiment of the invention may further comprise the steps:
Step S301: select first video output terminal as detection terminal, at the VT increase testing circuit of video pio chip;
In other embodiments of the invention, also can select second video output terminal as detection terminal, in addition, two video output terminals that the invention is not restricted to mention among the embodiment, it can comprise two or more video output terminals.
Step S302: testing circuit detects voltage or the current signal variation that first video output terminal connects the load front and back, the variation of detection signal is input to the input/output port of video pio chip;
In an embodiment of the present invention, use the detection principle of the mode that detects the output end signal electric current to be, when the terminal of Y-signal does not insert, the electric current of flowing through on the 8th resistance R 8 is 0, after inserting load, current value increases, and can realize the technical scheme of the embodiment of the invention by the variation that detects this current value.
Step S303: video pio chip scanning input/output port monitors change in detection signal, judges whether this signal output part has load to insert;
Step S304: when the video pio chip detects described first video output terminal and inserts load, export the signal of first video output terminal;
Step S305: when the video pio chip detects first video output terminal and do not insert load, export the signal of second video output terminal.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. video signal of digital television receiver commutation circuit, comprise video pio chip, at least one video output terminal, described video pio chip comprises VT and input/output port, described VT connects video output terminal, it is characterized in that, also comprise testing circuit, the input of described testing circuit and described video output terminal all are connected to the VT of video pio chip, and described testing circuit output links to each other with the input/output port of video pio chip.
2. video signal of digital television receiver commutation circuit as claimed in claim 1, it is characterized in that, described video output terminal comprises first video output terminal and second video output terminal, described VT connects first video output terminal and second video output terminal, and described testing circuit input is connected with first video output terminal with VT.
3. video signal of digital television receiver commutation circuit as claimed in claim 2 is characterized in that, also comprises the 7th resistance, and described the 7th resistance one end connects described VT, and the other end connects the second video output terminal input.
4. video signal of digital television receiver commutation circuit as claimed in claim 2 is characterized in that, also comprises the 8th resistance, and described the 8th resistance one end connects described VT, and the other end connects first video output terminal and testing circuit input.
5. video signal of digital television receiver commutation circuit as claimed in claim 1 is characterized in that, also comprises the 9th resistance, and described the 9th resistance one end connects described input/output port, other end connection detection circuit output.
6. as each described video signal of digital television receiver commutation circuit of claim 2 to 4, it is characterized in that, described testing circuit comprises first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, electric capacity, first triode, second triode, one end of described first resistance connects first video output terminal, the other end links to each other with first transistor base with electric capacity respectively, the collector electrode of described first triode links to each other with the 3rd resistance with second resistance respectively, the emitter of described first triode links to each other with the 5th resistance with the 4th resistance respectively, the other end of described the 4th resistance links to each other with second transistor base, described second transistor collector links to each other with the chip input/output port, the described second resistance other end links to each other electric capacity by the 6th resistance with the chip input/output port, the 3rd resistance, the emitter of the 5th resistance and second triode is ground connection respectively.
7. a video signal of digital television receiver changing method is characterized in that, may further comprise the steps:
Steps A: from a plurality of video output terminals, select a video output terminal as detection terminal, described a plurality of video output terminal comprises first video output terminal and second video output terminal, at the VT increase testing circuit of video pio chip;
Step B: voltage or current signal that testing circuit detects described video output terminal as detection terminal change, and detected variation are input to the input/output port of video pio chip;
Step C: video pio chip scanning input/output port monitors signal to be changed, and judges whether described video output terminal as detection terminal has load to insert; And
Step D: insert load if the video pio chip detects described video output terminal as detection terminal, from the described user-selected vision signal of video output terminal output as detection terminal.
8. video signal of digital television receiver changing method as claimed in claim 7 is characterized in that, in described steps A, selects first video output terminal as detection terminal.
9. video signal of digital television receiver changing method as claimed in claim 8 is characterized in that, in described step D, the video pio chip detects described first video output terminal and inserts load, exports the signal of first video output terminal.
10. video signal of digital television receiver changing method as claimed in claim 9 is characterized in that, in described step D, the video pio chip detects first video output terminal and do not insert load, exports the signal of second video output terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100665387A CN101277403B (en) | 2008-03-31 | 2008-03-31 | Circuit and method for switching video signal of digital television receiver |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100665387A CN101277403B (en) | 2008-03-31 | 2008-03-31 | Circuit and method for switching video signal of digital television receiver |
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| CN101277403A CN101277403A (en) | 2008-10-01 |
| CN101277403B true CN101277403B (en) | 2010-09-01 |
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| CN2008100665387A Expired - Fee Related CN101277403B (en) | 2008-03-31 | 2008-03-31 | Circuit and method for switching video signal of digital television receiver |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102387331A (en) * | 2010-08-31 | 2012-03-21 | 宏碁股份有限公司 | playing device and method |
| CN104714454B (en) * | 2015-03-12 | 2017-08-18 | 深圳市华星光电技术有限公司 | A kind of method and system of multiplexing chip pins |
| CN106331531B (en) * | 2015-06-29 | 2019-04-09 | 杭州海康威视数字技术股份有限公司 | The switching circuit and switching method of vision signal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1407800A (en) * | 2001-08-31 | 2003-04-02 | 汤姆森许可公司 | Technology for self-returning resolution mode after guide display |
| CN2596696Y (en) * | 2003-01-02 | 2003-12-31 | 青岛海信电器股份有限公司 | TV high speed signal switching circuit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1407800A (en) * | 2001-08-31 | 2003-04-02 | 汤姆森许可公司 | Technology for self-returning resolution mode after guide display |
| CN2596696Y (en) * | 2003-01-02 | 2003-12-31 | 青岛海信电器股份有限公司 | TV high speed signal switching circuit |
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