CN2319979Y - Reprocessor of colour television signal - Google Patents

Abstract

The utility model relates to a color television, particularly to a signal processing device for enhancing display articulation. The utility model is formed in the way that a delay circuit, a signal synthesis circuit and an elementary color matrix circuit which correspond to a B-Y output terminal, an R-Y output terminal and a G-Y output terminal of a decoding circuit are connected in turn, and the delay circuit, the signal synthesis circuit and a video amplifying circuit which correspond to a Y output terminal of the decoding circuit are connected in turn. The signal processing device can scan gradually in line by line in a two-row mode, eliminates the time difference between the last field and the next field and the staircase distortion of a diagonal image, and enhances the articulation by more than one time. Thereby, the utility model is suitable for various types of three-standard color televisions, and has the same using effect on a kinescope with a large size.

Description

Color television set signal reprocessor

The utility model relates to color television set, in order to improve a kind of signal processing apparatus of display resolution.

In the color television set, the picture tube that uses is an electronics gun type of gas burner at present, corresponding with picture tube, between decoding circuit and picture tube, only be provided with the primary colours matrix circuit, be B-Y, R-Y, G-Y and the Y output signal of decoding circuit, handle, synthesize R, G, B through the primary colours matrix circuit, import three negative electrodes of picture tube electron gun respectively.The deficiencies in the prior art part mainly is: be interlacing scan, last one and next have the regular hour poor, cause lack of defination; This phenomenon, along with the increase of color picture tube size, and serious further.

The purpose of this utility model is to avoid weak point of the prior art, and provide a kind of and can cooperate with picture tube with bielectron rifle, duplicate rows lines by line scan, the color television set that improves definition is with signal reprocessor product.

Can take following technical scheme to realize purpose.Color television set signal reprocessor, be connected successively by exporting corresponding delay circuit, signal synthesis circuit, primary colours matrix circuit with B-Y, R-Y, the G-Y of decoding circuit, delay circuit, signal synthesis circuit, the video amplifier circuit corresponding with the Y output of decoding circuit connect successively, and constitute.

Keeping under the constant situation of other due functional circuit of color television set, B-Y, R-Y, G-Y and the Y output of color television set decoding circuit are connected with four respective inputs of this color television set signal reprocessor respectively, and the output of signal reprocessor is connected with the corresponding utmost point of second electron gun of picture tube respectively.Like this, from the bright signal of the orchid of decoding circuit B-Y, R-Y, G-Y output, red, green three roadbed chrominance signals and Y output totally four tunnel, every road all is divided into two, first four the tunnel sends into the primary colours matrix circuit, synthetic R, G, B, import three negative electrodes of picture tube first gun respectively, sweep the image content of following delegation, promptly former scan line; Send into this signal reprocessor for second four the tunnel, handle, synthesize R, G, B, import three negative electrodes of picture tube second electron gun respectively, sweep the image content of top delegation, be i.e. that delegation of originally not scanning through related circuit.Interlacing scan is become duplicate rows line by line scan, obviously improve the definition of color television set.

Under the prerequisite that satisfies the said structure requirement, as for the concrete form of the composition of each funtion part of color television set signal reprocessor etc., all can take the circumstances into consideration to set according to using needs, they can both realize purpose, guarantee the serviceability and the effect of this color television set signal reprocessor.

The relative prior art of the technical program has following advantage and effect:

Cooperate with the color picture tube with bielectron rifle, line by line scan for duplicate rows on the picture, eliminate the stair distortion of and time difference between next and skewing scheme elephant, definition is enhanced about more than once; Applicable to NTSC, PAL, Sequential Color and Memory system formula, the color television set of various type machines; To the large scale color picture tube, has same result of use.

In conjunction with the accompanying drawings, execution mode is described in further detail the content of the technical program.

Fig. 1 is a kind of electrical schematic diagram of color television set signal reprocessor;

Fig. 2 is a color television set signal reprocessor and the winding diagram (part) of relevant electrical equipment.

Among the color television set signal reprocessor embodiment shown in the drawings, delay circuit is made of delay line X1 and resistance R, potentiometer W, capacitor C and inductance L, and Xi adopts 1H delay line PDL ₆₄₃, R, L are connected in parallel between two inputs of X1, and the direct circuit output that C, L, W constitute is connected with the centre cap of synthesizer; Signal synthesis circuit is is mainly connected and composed by synthesizer Ti, ground capacity and attenuator W, and Ti adopts adder-subtractor TRF ₅₄₀₂The primary colours matrix circuit is connected and composed by triode Qi and peripheral resistor-capacitor unit, and Qi adopts ₂DA ₂₃₇₁, the output of Ti is connected with the base stage of Qi by attenuator W and resistance; Video amplifier circuit is by triode Q ₄And peripheral components connects and composes Q ₄Adopt ₂C ₂₃₁₂C, synthesizer T ₄Output pass through resistance R ₈And Q ₄Base stage connect Q ₄Through R ₂₂, C ₁₃, R ₁₈, W ₁₂, C ₁₄, R ₁₉, W ₁₃, C ₁₅, R ₂₀Respectively with Q ₁, Q ₂, Q ₃Emitter connect; Q ₄Base stage be provided with horizontal blanking H, field blanking C binding post, Q ₁, Q ₂, Q ₃Collector electrode binding post B, R, the G that is connected with tube cathode is set respectively, also be provided with line output+E, frame excitation Z binding post.

The signal reprocessor has four active channels, main devices is represented with i=1,2,3,4 respectively, promptly by X ₁-X ₄Four delay lines, T ₁-T ₄Four synthesizers, Q ₁-Q ₄Four final stage video amplifier tubes constitute.Here only introduce wherein a road, i.e. B-Y one tunnel, other three the tunnel, R-Y, G-Y and Y and B-Y one road operation principle are just the same.

In the delay circuit:

R ₁, L ₁Parallel connection is delivered to X to B-Y signal ₁The lower end pin, constitute the both-end input of delay line, B-Y signal is by the delay line delegation that delays time, and paraphase, from two outputs outputs, gives signal synthesis circuit then.C ₁, L ₁, W ₁Three elements constitute the through connect signal path, and through connect signal is by above-mentioned three element arriving signal combiner circuit T ₁Centre cap.

Signal synthesis circuit:

Respectively by T ₁-T ₄(4 TRF ₅₄₀₂), C ₅-C ₈Four capacitors and W ₅-W ₈Four appearances subtract device and form.

By delay line X ₁Two output pins are sent the B-Y signal of paraphase, are added to T ₁The AB two ends because the signal voltage homophase at AB two ends subtracts each other and equals zero, therefore a through connect signal must be arranged, this through connect signal is by C ₁, L ₁, W ₁Guide to T ₁Centre tapped B end because through connect signal and time delayed signal are anti-phase, obtain B-Y signal after two signal voltages subtract each other, this signal is exactly the needed signal in this road, this signal is in the output of A end.At T ₁C end an induced voltage is arranged, so this voltage is provided with using C ₅Short circuit is fallen.

At T ₁The B-Y of A end output is because it is the resultant voltage by a time delayed signal and a through connect signal, so it has increased than the amplitude at the time-delay input.For another road B-Y that makes this road B-Y and original primary colours matrix output keeps amplitude consistent, therefore, at T ₁-T ₄The back respectively adds an attenuator W ₅-W ₈, regulate W ₅The amplitude of scalable B-Y.Again by R ₅, R ₉Two resistance are delivered to primary colours matrix circuit Q to B-Y signal ₁Base stage.At T ₁The B-Y signal that A end obtains, it is neither time delayed signal neither through connect signal, but the mean value of the two compromise, has so just solved the stair distortion of skewing scheme elephant.R ₁, L ₁, W ₁Three elements also constitute Q ₁Dc bias circuit, regulate W ₁Scalable Q ₁The base stage DC potential.T ₁The BA two ends also be Q ₁DC channel.

Video amplifier circuit:

By T ₄Y-signal is sent in the upper end, through R ₈Be added to video amplifier tube Q ₄Base stage is through Q ₄Amplification is sent to Q from emitter output ₁, Q ₂, Q ₃The emitter of three primary colours matrix pipes.At retrace interval, the blanking pulse of being sent here by scanning circuit is added to Q ₄Base stage is added vision signal and is in black-out intervals, at Q ₄Base stage forms very high level, causes Q ₄Reliably end; After the flyback, forward stroke interval, Q ₄Be operated in magnifying state, Y-signal is through Q ₄Amplify, export from emitter.R ₈Be Q ₄The biasing Y-signal path of holding concurrently, C ₁₂Decoupling capacitance, R ₁₇The direct current negative feedback resistor, L ₅The high frequency compensation inductance, D ₃D ₄Clamp diode, R ₁₂, Q ₄Load resistance.From Q ₄The Y-signal of emitter output is through R ₂₂, C ₁₃, R ₁₈W ₁₂, C ₁₄, R ₁₉W ₁₃, C ₁₅, R ₂₀Be added to Q respectively ₁, Q ₂, Q ₃Emitter.

The primary colours matrix circuit:

Respectively by Q ₁, Q ₂, Q ₃Serve as.By signal synthesis circuit T ₁B-Y is delivered to Q ₁Base stage; T ₂R-Y is delivered to Q ₂Substrate, T ₃G-Y is delivered to Q ₃Base stage.Three tunnel operating state, just the same, here only with example explanation in the first via:

By T ₁Deliver to Q ₁The B-Y signal of base stage and by Q ₄Deliver to Q ₁The Y-signal of emitter is at Q ₁In synthetic primary colour signal B, from collector electrode output, through R ₂₇, R ₃₀, L ₆Deliver to the negative electrode of picture tube.At retrace interval, the blanking pulse of being sent here by scanning circuit is added to Q ₄Base stage, at this moment Y-signal is in black-out intervals, Q ₄Base stage forms partially anti-and ends, and 12V passes through R ₂₁Closed service switch R ₂₂, R ₁₈Be added to Q ₁Deng emitter, emitter form reverse bias simultaneously B-Y be in retrace interval, blanking level is very low, makes Q ₁Instead partially reliably end.At this moment at Q ₁Collector electrode forms very high potential, and this high potential is added to tube cathode and makes beam suppression, and is not luminous.After the flyback, trace begins, Q ₄Conducting, Y-signal is sent to Q from emitter ₁Emitter, at this moment Q ₁Because base potential raises, the positively biased conducting, the B-Y signal of substrate and the Y-signal of emitter-base bandgap grading are at Q ₁Middle superposition, synthetic primary colour signal B, promptly picture intelligence is delivered to tube cathode, makes electron beam luminous, the displayed image content.L ₆The high frequency compensation inductance, R ₂₇, R ₃₀Isolation resistance prevents that electron stream is added to Q from negative electrode in the picture tube ₁Collector electrode burns out Q ₁Q ₁Collector electrode is powered by line output transformer, through R ₃₃, D ₅, L ₉Filtering R ₂₄, be added to Q ₁Collector electrode, the picture tube filament is powered by line output transformer, R ₁₄, W ₉, Q ₁The emitter-base bandgap grading negative feedback resistor is regulated W ₉Can change emitter potential.

The serviceability of accompanying drawing illustrated embodiment, result of use are good.

Claims (2)

1, a kind of color television set signal reprocessor, it is characterized in that, it is connected successively by exporting corresponding delay circuit, signal synthesis circuit, primary colours matrix circuit with B-Y, R-Y, the G-Y of decoding circuit, delay circuit, signal synthesis circuit, the video amplifier circuit corresponding with the Y output of decoding circuit connect successively, and constitute.

2, color television set signal reprocessor as claimed in claim 1 is characterized in that, delay circuit is made of delay line Xi and resistance R, potentiometer W, capacitor C and inductance L, and Xi adopts 1H delay line PDL ₆₄₃, R, L are connected in parallel between two inputs of Xi, and the direct circuit output that C, L, W constitute is connected with the centre cap of synthesizer; Signal synthesis circuit is is mainly connected and composed by synthesizer Ti, ground capacity and attenuator W, and Ti adopts adder-subtractor TRF ₅₄₀₂The primary colours matrix circuit is connected and composed by triode Qi and peripheral resistor-capacitor unit, and Qi adopts ₂DA ₂₃₇₁, the output of Ti is connected with the base stage of Qi by attenuator W and resistance; Video amplifier circuit is connected and composed by triode Q4 and peripheral components thereof, Q ₄Adopt ₂C ₂₃₁₂C, synthesizer T ₄Output pass through resistance R ₈And Q ₄Base stage connect Q ₄Through R ₂₂, C ₁₃, R ₁₈, W ₁₂, C ₁₄, R ₁₉, W ₁₃, C ₁₅, R ₂₀Respectively with Q ₁, Q ₂, Q ₃Emitter connect; Q ₄Base stage be provided with horizontal blanking, field blanking binding post, Q ₁, Q ₂, Q ₃Collector electrode the binding post that is connected with tube cathode is set respectively, also be provided with line output, frame excitation binding post.

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