CN102098420A - Video signal output circuit - Google Patents
Video signal output circuit Download PDFInfo
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- CN102098420A CN102098420A CN201110044631XA CN201110044631A CN102098420A CN 102098420 A CN102098420 A CN 102098420A CN 201110044631X A CN201110044631X A CN 201110044631XA CN 201110044631 A CN201110044631 A CN 201110044631A CN 102098420 A CN102098420 A CN 102098420A
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Abstract
The invention discloses a video signal output circuit, which is suitable for transmitting a video signal from a main core board of a television to a video interface and realizing the impedance matching of a display connected with the video interface. The circuit comprises a signal input circuit, a power circuit, an amplifying circuit and an output circuit, wherein the signal input circuit is connected to the main core board and is used for receiving a front-end video signal; the power circuit is used for supplying power to the video signal output circuit; the amplifying circuit is connected to an output end of the signal input circuit and the power circuit and realizes double amplification of the video signal; and the output circuit comprises a matching resistor which is connected in series between an output end of the amplifying circuit and the video interface and is used for dividing voltage.
Description
Technical field
The present invention relates to audio frequency and video electronic product field, relate more specifically to a kind of video signal output circuit.
Background technology
SCART(Syndicatdes Constructeursd'Appareils Radior é cepteursetT é l é viseurs) interface is a kind of video interface of special use, it is the audio-visual equipment interconnection industrial standard by the Peritel of French company exploitation, also is that European mandatory requirement is used for the interconnection and interflow interface on satellite television, receiver, television set, video tape recorder and other video equipment.The SCART interface of standard is 21 needle connectors, and external form is at right angles trapezoidal, is commonly called as " broom head ".Define the Voice ﹠ Video signal in this 21 pin, can be used to transmit vision signals such as CVBS and interlacing rgb signal, also can transmit stereo audio signal.21 pins transmit 21 signals simultaneously, and it is several that these 21 signals can be divided into vision signal, audio signal, control signal, ground wire and data wire.The SCART interface has the input and output function, be connected to video disc player, satellite television receiver or the game machine of SCART input interface specially, the output equipment ability usefulness that must possess the SCART output interface if do not have, can be used with the transducer of this interface commentaries on classics AV.The SCART interface is supported three kinds of video signal formats, i.e. CVBS (compound composite video signal), YC (component video signal) and RGB(color standard signal).The signal format of input can pass through the MCU(single-chip microcomputer) if level of the FB pin of detection SCART interface less than 1 volt then be RGB, otherwise is CVBS/YC.In addition, SCART interface or transmitted in both directions realize so-called " LOOP " circulatory function.The set-top box of for example two SCART interfaces is what to use less than the process chip of set-top box when using VCR, some simulated television can't be separated some coded signals, these signals can be imported by TV SCART interface from the SCART interface of some simulated televisions, output to VCR by VCR SCART interface, carry out being exported by VCR SCART after some deciphering wait processing, TV SCART interface outputs to televises again.The loop function of Here it is two SCART interfaces.
SCART interface on the market generally is built on the main central layer of television set, is used for the electronic device (being external load) of external display and so on.In order to meet the unified outputting standard in the industry, for example the magnitude of voltage that exports the vision signal of external load to the SCART interface is certain, but different loads has different resistance values, if vision signal directly exports external load from the main central layer of television set to by the SCART interface, because the output impedance of main central layer and the resistance value of external load might not mate, though the vision signal of its output can all can show on most display, but shows signal is also unstable, cause phenomenon appearance such as Hua Ping easily, do not meet industry standard.
Therefore, demand video signal output circuit a kind of and external load realization impedance matching urgently, overcome above-mentioned defective.
Summary of the invention
The object of the present invention is to provide a kind of video signal output circuit, be applicable to vision signal is transferred to video interface from the main central layer of television set, the impedance matching of the display that realization is connected with video interface, thus make that the vision signal of output is steady and audible, and applicability is wide.
To achieve these goals, the invention provides a kind of video signal output circuit, be applicable to vision signal is transferred to video interface from the main central layer of television set, it comprises signal input circuit, power circuit, amplifying circuit and output circuit; Described signal input circuit is connected in described main central layer, is used for transmission video signal; And power for described video signal output circuit; Described amplifying circuit is connected in the output and the described power circuit of described signal input circuit, realizes that the twice of vision signal is amplified; And described output circuit comprises build-out resistor, and described build-out resistor is series between the output and described video interface of described amplifying circuit, is used for dividing potential drop.
Compared with prior art, video signal output circuit of the present invention is enlarged into twice by amplifying circuit with vision signal, carry out dividing potential drop by the build-out resistor in the output circuit again, vision signal (for example: the TV equipment of band SCART interface) exports load to the most at last.Owing to be provided with amplifying circuit and build-out resistor, the feasible signal conformance with standard that finally exports load to by video interface.Realize the output impedance of video interface and the impedance matching of load, thereby make that the vision signal of output is stable, and applicability is wide.
Preferably, described amplifying circuit in the described video signal output circuit comprises first triode and second triode, the base stage of described first triode connects the output of described signal input circuit, and described second triode is connected between the collector electrode and emitter of described first triode.
Preferably, an end of the described build-out resistor in the described output circuit in the described video signal output circuit is connected in the emitter of described first triode and the collector electrode of described second triode, and the other end of described build-out resistor connects video interface.
Preferably, described amplifying circuit in the described video signal output circuit comprises first biasing resistor and second biasing resistor, the upper end of described first biasing resistor is connected in described power circuit, its lower end is connected in described signal input circuit, the upper end of described second biasing resistor is connected in the lower end of described first biasing resistor, its lower end ground connection; The upper end of the lower end of described first biasing resistor and described second biasing resistor is connected in the base stage of described first triode by a resistance.
Preferably, described video signal output circuit comprises that also filter circuit is connected between described power circuit and the described amplifying circuit.
Preferably, described filter circuit in the described video signal output circuit comprises filter resistance and filter capacitor, one end of described filter resistance connects described power circuit, its other end connects an end of described filter capacitor, the base stage and the emitter of described second triode, and the collector electrode of described first triode, the other end ground connection of described filter capacitor.
Alternatively, described filter circuit comprises two filter capacitors, one end of two described filter capacitors all is connected in the base stage and the emitter of described filter resistance, described second triode, and the collector electrode of described first triode, the equal ground connection of the other end of described filter capacitor.
Preferably, build-out resistor is 75 ohm in the video signal output circuit.
By following description also in conjunction with the accompanying drawings, it is more clear that the present invention will become, and these accompanying drawings are used to explain embodiments of the invention.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, to do to introduce simply to the accompanying drawing of required use among the embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the circuit theory diagrams of video signal output circuit first embodiment of the present invention.
Fig. 2 is the circuit theory diagrams of video signal output circuit second embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme among the embodiment is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.With reference now to accompanying drawing, describe embodiments of the invention, the similar elements label is represented similar elements in the accompanying drawing.The invention provides a kind of video signal output circuit, be applicable to vision signal is transferred to video interface from the main central layer of television set, the impedance matching of the display that realization is connected with video interface, thus make that the vision signal of output is steady and audible, and applicability is wide.
Figure 1 shows that the circuit theory diagrams of video signal output circuit first embodiment of the present invention.Video signal output circuit 10 of the present invention is applicable to vision signal is transferred to video interface from the main central layer of television set that it comprises signal input circuit 11, power circuit 12, amplifying circuit 13 and output circuit 14.The vision signal of television set master central layer transfers to amplifying circuit 13 by signal input circuit 11, simultaneously, power circuit 12 transfers to amplifying circuit 13 with direct voltage and gives the whole video signal output apparatus 10 power supplies, vision signal rises to original twice by amplifying circuit 13 its voltages of back, then, signal enters output circuit 14, output circuit 14 is provided with build-out resistor, make that finally the voltage that exports on the load display by video interface is identical with output voltage on the television set master central layer, but output impedance is identical with the output impedance of load.Realize the output impedance of video interface and the impedance matching of load, thereby make that the vision signal of output is steady and audible, improve its applicability.
With reference to figure 1, first embodiment of the invention video signal output circuit 10 is arranged on the circuit board (figure does not show) of television set, main central layer is installed on the television set, be mainly used in demodulation and handle vision signal, and the processed video signal is transferred to the input of described signal input circuit 11, the input of signal input circuit 11 is connected in the left end of capacitor C 1, capacitor C 1 is mainly used in preliminary filtering high-frequency interferencing signal, the right-hand member of capacitor C 1 connects power circuit 12 and amplifying circuit 13, and this power circuit 12 provides 5 volts direct voltage for video signal output circuit 10 of the present invention.Amplifying circuit 13 mainly comprises the first triode Q1, second triode Q2 and the biasing resistor.Particularly, the right-hand member of capacitor C 1 connects the upper end of the first biasing resistor R1 and the lower end of the second biasing resistor R2, and the ground connection of the first biasing resistor R1 lower end is provided with, and the upper end of the second biasing resistor R2 connects power circuit 12.The lower end of the upper end of the first biasing resistor R1 and the second biasing resistor R2 connects the end of input resistance R3, the other end of input resistance R3 connects the base stage of the described first triode Q1, the collector electrode of the first triode Q1 connects the base stage of the described second triode Q2, and connects the emitter of the power circuit 12 and the second triode Q2 by resistance R 4.The emitter of the first triode Q1 is provided with by resistance R 6 ground connection simultaneously by the collector electrode of the resistance R 5 connections second triode Q2.After the collector electrode of the second triode Q2 is connected in resistance R 5, be connected with described output circuit 14 in the lump; Particularly, the end of build-out resistor R7 in the output circuit 14 connects collector electrode and the resistance R 5 of the second triode Q2, the other end of build-out resistor R7 is provided with by capacitor C 2 ground connection, and connects video interface, transfers to the load display with handling vision signal later by video interface.It should be noted that among the present invention that this video interface is the SCART interface.Need to prove that the value of the first biasing resistor R1 is 10K ohm, the value of the second biasing resistor R2 is 15K ohm; Can be 10K ohm with the value of the first biasing resistor R1 also, the value of the second biasing resistor R2 be 22K ohm.
With reference to figure 1, introduce the concrete course of work of video signal output circuit in the first embodiment of the invention below.
When television set receives the vision signal that TV station sends, be in harmonious proportion after corresponding the processing through separating of the inner main central layer of television set, the video signal transmission that exchanges is to video signal output circuit 10, and power circuit wherein 12 connects DC power supply, and 5 volts direct voltage is offered whole video signal output apparatus 10.To amplifying circuit 10, biasing resistor R1 and R2 form biasing circuit to signal input circuit 11 with the video signal transmission that receives, bias voltage are provided for the first triode Q1, keep its normal work.Wherein, in an embodiment of the present invention, the first triode Q1 is that model is 3904 triode, and the second triode Q2 is that model is 3906 triode.The first triode Q1 has the effect of emitter following, and this makes vision signal pass through the base stage input of the first triode Q1, and after the emitter output, the voltage of this vision signal is constant, and can follow the linear change of the vision signal of input in a big way.Being provided with of the first triode Q1 improved video signal output circuit 10 load-carrying abilities and as cushioning effect.Vision signal transfers to the second triode Q2 by the collector electrode of the first triode Q1, and the second triode Q2 amplifies twice with vision signal.
As shown in Figure 1, the voltage that A between resistance 5 and the resistance 7 is ordered is the twice of the video voltage of main central layer output, that is to say, amplifying circuit 13 is enlarged into twice with the vision signal in the signal input circuit 11, for example, the alternating voltage of the original vision signal of common main central layer output is 1 volt, and through behind the amplifying circuit 13, the alternating voltage that A is ordered is 2 volts.Then, video signal transmission is to output circuit 14.At length, behind the vision signal process build-out resistor R7, transfer to video interface, vision signal transfers to the load display by video interface.The output resistance of video signal output circuit 10 is the resistance of build-out resistor R7.In order to meet industry standard, because the resistance value of general load display is 75 ohm, so in the present embodiment, the resistance value of this build-out resistor R7 is set to 75 ohm.This makes because the dividing potential drop effect of build-out resistor R7, the voltage that B is ordered among Fig. 1 is half of A point voltage, that is: the original video amplitude value that transfers to the output of video amplitude on the load display and main central layer is 1V, thereby guarantee that amplitude output signal meets the industry standard requirement, but output resistance no longer is the resistance value of main central layer, but the build-out resistor R7 that can change according to the resistance of load display, thereby realize the output impedance of video interface and the impedance matching of load display, thereby make that the vision signal of output is steady and audible, improve its applicability.In other embodiments, build-out resistor can be arranged to adjustable resistance, is determined on a case-by-case basis.
Fig. 2 is second embodiment of video signal output circuit of the present invention.With reference to Fig. 1-2, video signal output circuit 20 has increased filter circuit 15 on the basis of first embodiment of the invention, and except filter circuit 15, other circuit structure is identical with first embodiment.In the present embodiment, filter circuit 15 is the RC filter circuit, and this filter circuit 15 is low-pass filter circuits.Filter circuit 15 is connected between described power circuit 12 and the described amplifying circuit 13.Described filter circuit 15 comprises filter resistance R8 and filter capacitor C3 and C4, the end of described filter resistance R8 connects described power circuit 12, an its other end connection filter capacitor C3 and a C4 end separately, the emitter-base bandgap grading of the described second triode Q2, connect the base stage of the second triode Q2 and the collector electrode of the first triode Q1 by resistance R 4, the other end of capacitor C 3 and C4 ground connection in parallel.The setting of filter circuit 15 is for the contained high-frequency interferencing signal of elimination DC power supply, makes that the voltage of supplying video signal output apparatus 20 is purer, thereby reaches better outputting video signal.
Above invention has been described in conjunction with most preferred embodiment, but the present invention is not limited to the embodiment of above announcement, and should contain various modification, equivalent combinations of carrying out according to essence of the present invention.
Claims (8)
1. video signal output circuit is applicable to vision signal is transferred to video interface from the main central layer of television set, and it comprises:
Signal input circuit is connected in described main central layer, is used for transmission video signal;
Power circuit, it is connected in the output of described signal input circuit, and gives described video signal output circuit power supply;
Amplifying circuit, it is connected in the output and the described power circuit of described signal input circuit, realizes that the twice of vision signal is amplified; And output circuit, it comprises build-out resistor, described build-out resistor is series between the output and described video interface of described amplifying circuit, is used for dividing potential drop.
2. video signal output circuit as claimed in claim 1, it is characterized in that, described amplifying circuit comprises first triode and second triode, the base stage of described first triode connects the output of described signal input circuit, and described second triode is connected between the collector electrode and emitter of described first triode.
3. video signal output circuit as claimed in claim 2, it is characterized in that, one end of the described build-out resistor in the described output circuit is connected in the emitter of described first triode and the collector electrode of described second triode, and the other end of described build-out resistor connects video interface.
4. video signal output circuit as claimed in claim 2, it is characterized in that, described amplifying circuit comprises first biasing resistor and second biasing resistor, the upper end of described first biasing resistor is connected in described power circuit, its lower end is connected in described signal input circuit, the upper end of described second biasing resistor is connected in the lower end of described first biasing resistor, its lower end ground connection; The upper end of the lower end of described first biasing resistor and described second biasing resistor is connected in the base stage of described first triode by a resistance.
5. as claim 1 or 3 or 4 described video signal output circuits, it is characterized in that, comprise that also filter circuit is connected between described power circuit and the described amplifying circuit.
6. video signal output circuit as claimed in claim 5, it is characterized in that, described filter circuit comprises filter resistance and filter capacitor, one end of described filter resistance connects described power circuit, its other end connects an end of described filter capacitor, the base stage and the emitter of described second triode, and the collector electrode of described first triode, the other end ground connection of described filter capacitor.
7. video signal output circuit as claimed in claim 7, it is characterized in that, described filter circuit comprises two filter capacitors, one end of two described filter capacitors all is connected in the base stage and the emitter of described filter resistance, described second triode, and the collector electrode of described first triode, the equal ground connection of the other end of described filter capacitor.
8. video signal output circuit as claimed in claim 1 is characterized in that, build-out resistor is 75 ohm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110044631XA CN102098420A (en) | 2011-02-24 | 2011-02-24 | Video signal output circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110044631XA CN102098420A (en) | 2011-02-24 | 2011-02-24 | Video signal output circuit |
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| CN102098420A true CN102098420A (en) | 2011-06-15 |
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| CN201110044631XA Pending CN102098420A (en) | 2011-02-24 | 2011-02-24 | Video signal output circuit |
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Cited By (4)
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| CN102332246A (en) * | 2011-09-28 | 2012-01-25 | 常州工学院 | Video graphics array (VGA) multi-channel distribution circuit and working method thereof |
| CN104601957A (en) * | 2015-01-19 | 2015-05-06 | 信阳农林学院 | Multimedia view screen signal transmission device |
| CN106060436A (en) * | 2016-03-28 | 2016-10-26 | 乐视控股（北京）有限公司 | Video output method, video output circuit and multimedia terminal |
| CN108200311A (en) * | 2018-01-31 | 2018-06-22 | 商洛学院 | Monitoring image transmits signal amplifier |
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| CN108200311A (en) * | 2018-01-31 | 2018-06-22 | 商洛学院 | Monitoring image transmits signal amplifier |
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Address after: 510663 Guangdong city of Guangzhou province Guangzhou Science City Kezhu Road No. 192 Applicant after: Guangzhou CVT Electronics Technology Co., Ltd. Address before: 510663 Guangdong city of Guangzhou province Guangzhou Science City Kezhu Road No. 192 Applicant before: Guangzhou Shiyuan Electronics Technology Co., Ltd. |
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Application publication date: 20110615 |