CN107659817A - Using the video decoder of DC restorer - Google Patents

Using the video decoder of DC restorer Download PDF

Info

Publication number
CN107659817A
CN107659817A CN201710972573.4A CN201710972573A CN107659817A CN 107659817 A CN107659817 A CN 107659817A CN 201710972573 A CN201710972573 A CN 201710972573A CN 107659817 A CN107659817 A CN 107659817A
Authority
CN
China
Prior art keywords
resistance
circuit
lock detectors
electric capacity
diode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710972573.4A
Other languages
Chinese (zh)
Inventor
王梅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201710972573.4A priority Critical patent/CN107659817A/en
Publication of CN107659817A publication Critical patent/CN107659817A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/643—Hue control means, e.g. flesh tone control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

The invention discloses the video decoder of application DC restorer, including color bandpass amplifier, be delayed split circuit, U lock detectors, V lock detectors, decoder matrix circuit, output device, benchmark tone carrier recovery circuit, luminance channel, the color bandpass amplifier is connected with delay split circuit, the U lock detectors and V lock detectors are connected with delay split circuit respectively, the U lock detectors and V lock detectors are connected with decoder matrix circuit respectively, the U lock detectors and V lock detectors are connected with benchmark tone carrier recovery circuit respectively, the decoder matrix circuit is connected with output device, the luminance channel is connected with color bandpass amplifier, the luminance channel is connected with decoder matrix circuit.The present invention shortens the response time by U lock detectors, V lock detectors, decoder matrix circuit, output device, benchmark tone carrier recovery circuit, luminance channel, avoids the generation of image conditions of streaking.

Description

Using the video decoder of DC restorer
Technical field
The present invention relates to television decoding field, and in particular to using the video decoder of DC restorer.
Background technology
TV (Television, TV, Video) refers to the image frame and audio using electronic technology and equipment transmission activity Signal, i.e. television receiver, and important broadcast and video communication instrument, television set is earliest by Britain engineer John Lip river Lucky Baird is invented in nineteen twenty-five.The visual pattern of TV electronically transmission activity immediately.It is similar with film, TV profit Show the rest image of a frame frame gradual change with the persistence of vision effect of human eye, form visual live image.Television system is sent out It is order transmission after electric signal that each fine fraction of scenery is pressed brightness and chroma conversion by sending end.In receiving terminal by corresponding several What position shows brightness and the colourity of each fine fraction to reappear view picture original image.The progress of science and technology, is that TV is rapid One major reason of popularization.Various countries' TV signal scanning standard and channel broadband are incomplete same, are seeked advice from by international wireless electricity The suggestion of the committee (CCIR) is distinguished with the Latin alphabet.Existing television set easily produces image conditions of streaking, causes image to drag The reason for tail, is that the response time is oversize, and the only response time short enough just can guarantee that the coherent of picture.
The content of the invention
The technical problems to be solved by the invention are that existing television set easily produces image conditions of streaking, cause image to trail The reason for be the response time it is oversize, and it is an object of the present invention to provide using DC restorer video decoder, shorten ring Between seasonable, the generation of image conditions of streaking is avoided.
The present invention is achieved through the following technical solutions：
It is same using the video decoder of DC restorer, including color bandpass amplifier, delay split circuit, U Wave detector, V lock detectors, decoder matrix circuit, output device, benchmark tone carrier recovery circuit, luminance channel are walked, it is described Color bandpass amplifier with delay split circuit be connected, the U lock detectors and V lock detectors respectively with delay split circuit Connection, the U lock detectors and V lock detectors are connected with decoder matrix circuit respectively, and the U lock detectors and V are same Step wave detector is connected with benchmark tone carrier recovery circuit respectively, and the decoder matrix circuit is connected with output device, described bright Degree passage is connected with color bandpass amplifier, and the luminance channel is connected with decoder matrix circuit；
The clamp circuit includes inductance L2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, current potential Device R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, electric capacity C1, electric capacity C2, electric capacity C3, electrochemical capacitor C4, three Pole pipe V1, triode V2, diode D1, diode D2, described inductance L2 one end are signal input part, and the inductance L2 other end connects Connecting resistance R1, the resistance R1 connections inductance L2 ends the other end connection electric capacity C1, the electric capacity C1 connections resistance R1 ends it is another One end connecting triode V1；Described resistance R2 one end is connected on the circuit that resistance R1 is connected with electric capacity C1, its other end ground connection； The termination powers of resistance R3 mono-, its other end are connected on the circuit that electric capacity C1 is connected with triode V1；The potentiometer R4, two poles Pipe D1, resistance R5 are connected, and the anode of the diode D1 is connected with potentiometer R4；The resistance R5 connections diode D1 ends it is another One end connecting triode V1 emitter stage；The termination powers of electric capacity C2 mono-, the other end are connected with resistance R6, and resistance R6's is another End connection potentiometer R7 movable end；Triode V1 colelctor electrode is connected with electrochemical capacitor C4 positive pole；The resistance R8, resistance R9, resistance R10 are sequentially connected in series, the other end connection electrochemical capacitor C4 at resistance R8 connections resistance R9 ends positive pole；The electricity Hold C3 and be connected in parallel on diode D2 both ends, the negative electrode of the diode D2 connects power supply, and anode is connected to resistance R8 and is connected with resistance R9 Circuit on；Electrochemical capacitor C4 positive pole is connected with triode V2 base stage；Resistance R11 one end connection positive pole, its other end Connecting triode V2 emitter stage, resistance R12 one end connecting triode V2 colelctor electrode, its other end ground connection.
The present invention is that the composite colour television signal exported by vision signal detector is demodulated to red, green, blue tristimulus signals, point Do not give three negative electrodes of kinescope, go control tri- emission of cathode of R, G, B electron beam power, utilization space mixed-color method, Reappear coloured image true to nature on viewing screen.The composite colour television signal sent by intermediate-frequency channel, is divided into two-way Decoder is delivered to, luminance channel circuit is sent into all the way, filters carrier chrominance signal by 4.43MHz color sub-carrier trapper, then Recover by the delay of luminance channel circuit, crisperding, amplification and DC component, luminance signal is delivered into decoder matrix circuit；Separately Chrominance channel is sent into all the way, and carrier chrominance signal and colour burst signal are isolated by color bandpass amplifier, after amplification, colour burst signal Reference subcarrier restoring circuit is delivered to, carrier chrominance signal delivers to delay split circuit (i.e. comb filter), carrier chrominance signal is separated For two components of FU, FV, U lock detectors and V lock detectors are delivered to respectively, and blueness is demodulated in reference subcarrier presence Difference signal and red color difference signal, recover green color difference signal with red difference and blue difference signal in color difference matrix circuit.Then, These three colour difference signals are delivered into primary matrices circuit together with luminance signal, demodulate R, G, B tristimulus signals.
The effect of reference subcarrier circuit, it is that one frequency of generation is identical with transmitting terminal color sub-carrier frequency, and with one The machine color sub-carrier of fixed phase relation, after appropriate phase shift and line-by-line inversion, U, V synchronous demodulator are sent into, so as to Two components of FU, FV are synchronized with demodulation, recovers red difference and blue difference signal.
Unit circuit is acted on by it in decoder, can be divided into luminance channel circuit, chrominance channel circuit, reference secondary and be carried Ripple restoring circuit and decoder matrix circuit etc. four are most of.
Clamp circuit is called DC restorer, circuit structure：V1 is direct current clamper tube, and W2 is auxiliary brightness regulation Potentiometer, W1 are luminance potentiometer, and C3 is direct current clamp capacitor, and and separated by direct communication effect.
Circuit analysis：Clamp pulse is to be formed by line synchronising signal after delay circuit is delayed, and it is right in time relationship Answer the back porch of blanking pulse.When being acted on without clamp pulse, clamper tube V1 base potential and transmitting electrode potential is close consistent, because And it is in cut-off state.When clamp pulse is added to V1 base stage, V1 saturation conductions, V1 collector potential Vc is approximately equal to it Launch electrode potential VE, V2 base potential VB ≈ VE, therefore C3 is charged to rapidly VE.After clamp pulse, V1 is again in cut-off State, C3 are slowly discharged by V2 base loop, (be should ensure that because discharge time constant is very big during design much larger than row week Phase), therefore within a row cycle, the upper voltage changes of C3 are little, and V2 base potential pincers just also are scheduled on into V1 emitter stage level On VE, and VE is clamping level, previously given in blanking level, so, V2 base potential is scheduled on blanking electricity by pincers all the time On flat, so, either details in a play not acted out on stage, but told through dialogues, or bright field, its blanking level are all fixed on clamping level VE, are equivalent to recover The DC component lost.R4 is adjusted, R7 can change clamping level VE size, also be equivalent to change the brightness of V1 outputs The DC level of signal, because circuit is direct-coupling below, the DC level for just making to be added to 3 negative electrodes of color picture tube changes Become, on screen brightness achieve that control.R7 adjusts resistance to be arranged in machine, and as auxiliary brightness regulation, R4 potentiometers are arranged on On TV set panel, as brightness regulation.
Further, using the video decoder of DC restorer, the luminance channel includes trapper, prolonged When circuit, clamp circuit, the trapper, delay circuit, clamp circuit be sequentially connected, the trapper and color bandpass amplifier Connection, the clamp circuit are connected with decoder matrix circuit.
Further, 4.43MHz color pairs are used using the video decoder of DC restorer, the trapper Carrier wave trap circuit.The effect of color sub-carrier trap circuit is to curb the carrier chrominance signal in composite colour television signal, is allowed bright Degree signal passes through, so as to isolate luminance signal Y.Because carrier chrominance signal in composite colour television signal and luminance signal are in frequency Partly overlapped in domain, if carrier chrominance signal not being curbed and inputting luminance channel, many interference bright spots occur on screen, These interference bright spots are formed by carrier chrominance signal.Subcarrier, which is added, in luminance channel is done precisely in order to eliminating luminous point Disturb, subcarrier necessarily also together inhales the luminance signal in the range of same frequency while suction sops up carrier chrominance signal Receive, so the bandwidth of trapper can not take the bandwidth ± 1.3MHz of carrier chrominance signal, be generally configured to 150KHz~250KHz, it is no Can then image definition be caused to decline.
Further, DS- is used using the video decoder of DC restorer, the decoder matrix circuit 6301D。
The present invention compared with prior art, has the following advantages and advantages：The present invention by color bandpass amplifier, Be delayed split circuit, U lock detectors, V lock detectors, decoder matrix circuit, output device, benchmark tone carrier auxiliary electricity Road, luminance channel shorten the response time, avoid the generation of image conditions of streaking；The present invention passes through potentiometer R7, potentiometer R4 And triode V1 and triode V2 regulation and cooperation, recover the DC component in luminance signal, ensure coloured image Tone and color saturation do not change.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is schematic structural view of the invention；
Fig. 2 is clamp circuit structural representation of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make For limitation of the invention.
Embodiment
As depicted in figs. 1 and 2, using the video decoder of DC restorer, including color bandpass amplifier, prolong When split circuit, U lock detectors, V lock detectors, decoder matrix circuit, output device, benchmark tone carrier auxiliary electricity Road, luminance channel, the color bandpass amplifier are connected with delay split circuit, U lock detectors and the V lock detector point It is not connected with delay split circuit, the U lock detectors and V lock detectors are connected with decoder matrix circuit respectively, the U Lock detector and V lock detectors are connected with benchmark tone carrier recovery circuit respectively, the decoder matrix circuit and output Device is connected, and the luminance channel is connected with color bandpass amplifier, and the luminance channel is connected with decoder matrix circuit；
The clamp circuit includes inductance L2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, current potential Device R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, electric capacity C1, electric capacity C2, electric capacity C3, electrochemical capacitor C4, three Pole pipe V1, triode V2, diode D1, diode D2, described inductance L2 one end are signal input part, and the inductance L2 other end connects Connecting resistance R1, the resistance R1 connections inductance L2 ends the other end connection electric capacity C1, the electric capacity C1 connections resistance R1 ends it is another One end connecting triode V1；Described resistance R2 one end is connected on the circuit that resistance R1 is connected with electric capacity C1, its other end ground connection； The termination powers of resistance R3 mono-, its other end are connected on the circuit that electric capacity C1 is connected with triode V1；The potentiometer R4, two poles Pipe D1, resistance R5 are connected, and the anode of the diode D1 is connected with potentiometer R4；The resistance R5 connections diode D1 ends it is another One end connecting triode V1 emitter stage；The termination powers of electric capacity C2 mono-, the other end are connected with resistance R6, and resistance R6's is another End connection potentiometer R7 movable end；Triode V1 colelctor electrode is connected with electrochemical capacitor C4 positive pole；The resistance R8, resistance R9, resistance R10 are sequentially connected in series, the other end connection electrochemical capacitor C4 at resistance R8 connections resistance R9 ends positive pole；The electricity Hold C3 and be connected in parallel on diode D2 both ends, the negative electrode of the diode D2 connects power supply, and anode is connected to resistance R8 and is connected with resistance R9 Circuit on；Electrochemical capacitor C4 positive pole is connected with triode V2 base stage；Resistance R11 one end connection positive pole, its other end Connecting triode V2 emitter stage, resistance R12 one end connecting triode V2 colelctor electrode, its other end ground connection.
The luminance channel includes trapper, delay circuit, clamp circuit, the trapper, delay circuit, clamp circuit It is sequentially connected, the trapper is connected with color bandpass amplifier, and the clamp circuit is connected with decoder matrix circuit.
The trapper uses 4.43MHz color sub-carrier trap circuits.
The decoder matrix circuit uses DS-6301D.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include Within protection scope of the present invention.

Claims (4)

1. the video decoder of application DC restorer, it is characterised in that including color bandpass amplifier, delay separation Circuit, U lock detectors, V lock detectors, decoder matrix circuit, output device, benchmark tone carrier recovery circuit, brightness Passage, the color bandpass amplifier are connected with delay split circuit, and the U lock detectors and V lock detectors are respectively with prolonging When split circuit connect, the U lock detectors and V lock detectors be connected with decoder matrix circuit respectively, the synchronous inspections of the U Ripple device and V lock detectors are connected with benchmark tone carrier recovery circuit respectively, and the decoder matrix circuit connects with output device Connect, the luminance channel is connected with color bandpass amplifier, and the luminance channel is connected with decoder matrix circuit；
The clamp circuit includes inductance L2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, potentiometer R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, electric capacity C1, electric capacity C2, electric capacity C3, electrochemical capacitor C4, three poles Pipe V1, triode V2, diode D1, diode D2, described inductance L2 one end are signal input part, and the inductance L2 other end connects Resistance R1, the resistance R1 connections inductance L2 ends the other end connection electric capacity C1, the electric capacity C1 connections resistance R1 ends it is another Hold connecting triode V1；Described resistance R2 one end is connected on the circuit that resistance R1 is connected with electric capacity C1, its other end ground connection；Electricity The termination powers of R3 mono- are hindered, its other end is connected on the circuit that electric capacity C1 is connected with triode V1；The potentiometer R4, diode D1, resistance R5 are connected, and the anode of the diode D1 is connected with potentiometer R4；The resistance R5 connections diode D1 ends it is another Hold connecting triode V1 emitter stage；The termination powers of electric capacity C2 mono-, the other end are connected with resistance R6, the resistance R6 other end Connect potentiometer R7 movable end；Triode V1 colelctor electrode is connected with electrochemical capacitor C4 positive pole；The resistance R8, resistance R9, resistance R10 are sequentially connected in series, the other end connection electrochemical capacitor C4 at resistance R8 connections resistance R9 ends positive pole；The electricity Hold C3 and be connected in parallel on diode D2 both ends, the negative electrode of the diode D2 connects power supply, and anode is connected to resistance R8 and is connected with resistance R9 Circuit on；Electrochemical capacitor C4 positive pole is connected with triode V2 base stage；Resistance R11 one end connection positive pole, its other end Connecting triode V2 emitter stage, resistance R12 one end connecting triode V2 colelctor electrode, its other end ground connection.
2. the video decoder according to claim 1 using DC restorer, it is characterised in that described bright Spending passage includes trapper, delay circuit, clamp circuit, and the trapper, delay circuit, clamp circuit are sequentially connected, described Trapper is connected with color bandpass amplifier, and the clamp circuit is connected with decoder matrix circuit.
3. the video decoder according to claim 2 using DC restorer, it is characterised in that described to fall into Ripple device uses 4.43MHz color sub-carrier trap circuits.
4. the video decoder according to claim 1 using DC restorer, it is characterised in that the solution Code matrix circuit uses DS-6301D.
CN201710972573.4A 2017-10-18 2017-10-18 Using the video decoder of DC restorer Pending CN107659817A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710972573.4A CN107659817A (en) 2017-10-18 2017-10-18 Using the video decoder of DC restorer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710972573.4A CN107659817A (en) 2017-10-18 2017-10-18 Using the video decoder of DC restorer

Publications (1)

Publication Number Publication Date
CN107659817A true CN107659817A (en) 2018-02-02

Family

ID=61118870

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710972573.4A Pending CN107659817A (en) 2017-10-18 2017-10-18 Using the video decoder of DC restorer

Country Status (1)

Country Link
CN (1) CN107659817A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115832097A (en) * 2022-12-09 2023-03-21 浙桂(杭州)半导体科技有限责任公司 Avalanche diode control circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115832097A (en) * 2022-12-09 2023-03-21 浙桂(杭州)半导体科技有限责任公司 Avalanche diode control circuit

Similar Documents

Publication Publication Date Title
US4429327A (en) Compatible television system with increased vertical resolution
JPS6127954B2 (en)
US2594715A (en) Apparatus for color television
CN107659817A (en) Using the video decoder of DC restorer
US2954426A (en) Automatic shift of color balance
CA1156319A (en) Service switch apparatus
US3624275A (en) Color television signal demodulation system with compensation for high-frequency rolloff in the luminance signal
McMann et al. Improved signal processing techniques for color television broadcasting
CN107749958A (en) Video decoding system based on contour correction device
CN107659803A (en) The colour decoding system of television set
KR100931923B1 (en) Color video display signal processor
US3134850A (en) Color television control apparatus
Trundle Newnes Guide to TV and Video Technology
US3586766A (en) Matrix amplifier
CN107734317A (en) A kind of DC restorer
US4112460A (en) Simplified bias and gain adjust system for color cathode ray tube
JPS6343955B2 (en)
CA1065471A (en) Automatic beam current limiter
US3644669A (en) Automatic beam intensity limiter with a current transformer coupled to the ultor lead
CN107786824A (en) System occurs for the scanning signal based on improved row split circuit
US3721760A (en) Blanking circuitry for blanking a cathode ray tube
US2938071A (en) Color television matrix demodulator
CN1056202A (en) Video processing circuit
Trundle Newnes guide to television and video technology
JPS602715Y2 (en) Image quality switching device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20180202