CN2240816Y - System and frequency converting device for colour television set - Google Patents

Abstract

The utility model relates to a system and frequency converting device for color television set, comprising a frequency mixing circuit, an accompanying sound frequency discrimination circuit and a high speed optical switch circuit, and it also comprises a frequency conversion circuit and an electronic switching circuit which are composed of a capacitor C < 1 >-C < 9>, a resistor R < 1 >-R < 16>, a transistor Q<1 >-Q<5>, a diode D< 1 >-D < 5 > and a crystal resonator, and the two circuits can also be made into an integrated circuit block which can compose a sound intermediate frequency handling of the omni-system color TV receiver and a color subcarrier switching circuit with the CD4066 and the discrete device. The system and frequency converting device for color television set of the utility model has simple structure and low cost, which is suitable for the system and frequency conversion for various typed color television sets.

Description

Colour TV standard frequency converter

The utility model relates to a kind of frequency converter, and particularly the standard frequency converter used of a colour TV belongs to TV technology.

Along with market economy increasing development, imported product continually, especially household appliances, television set, satellite received television program popularizes, the raising of video disc player popularity rate, so just relate to the system conversion technology, the color TV set that promptly needs multi-modulation scheme, and the colour TV of single system is is just laid aside and neglected.The technical products of at present existing many this respects comes out, as China Patent No. is CN93222881X (denomination of invention-a kind of manual system conversion device), CN86100-610 (denomination of invention-TV system conversion apparatus), but these technical products use inconvenience, structure is complicated, and cost is high and can not change standard automatically.

The purpose of this utility model provide a kind of simple in structure, cost is low, the easy to use and colour TV standard frequency converter that can carry out system conversion automatically.

The utility model is achieved in that it comprises mixting circuit, high-speed switching circuit, sound accompaniment frequency-discriminating circuit, colour decoding circuit, also comprises one simultaneously by capacitor C ₁～C ₉, resistance R ₁～R ₉, transistor Q ₁～Q ₂, the freq converting circuit that constitutes of quartz crystal unit Z, inductance L, terminal A～D, wherein: transistor Q ₁Base stage one tunnel and capacitor C ₂, C ₃(both serial connections) resistance R ₁, quartz crystal unit Z indigo plant is connected to terminal B, (capacitor C after connecing ₁And is connected between terminal A, the B), another road is through resistance R ₂With Q ₁A road the joining of collector electrode, another road of collector electrode is respectively through resistance R ₄, capacitor C ₄Join Q with terminal A and ground ₁Emitter through resistance R, receive terminal B and earth potential respectively, resistance R ₃An end be connected C ₂, C ₃Between.The other end is connected resistance R, with Q ₄Emitter between, transistor Q _eBase stage respectively through resistance R ₆, R ₇(both serial connections), capacitor C, C joins with end points, Q ₂Collector electrode respectively through resistance R ₈, inductance I ₁(Liang person And connects), capacitor C ₆D joins with end points, and emitter is through resistance R ₉, capacitor C ₇(Liang person And connects) ground connection, capacitor C ₈One end and end points D join, other end ground connection, capacitor C, an end and Q ₂Base stage join.The other end and Q ₂Emitter join;

One by resistance R ₁₀～R ₁₆, transistor Q ₃～Q ₃, diode D ₁～D ₄, the electronic switching circuit that constitutes of end points E～K, wherein: transistor Q ₃Base stage through resistance R ₁₆E joins with end points, emitter a road through resistance R ₁₁Difference ground connection and end points F, another road is through resistance R ₁₂, R ₁₄Respectively with transistor Q ₄Collector electrode, end points H, transistor Q ₅Base stage join transistor Q ₄Base stage through resistance R ₁₃G joins with end points, grounded emitter, transistor Q, collector electrode one tunnel through resistance R ₁, respectively with end points I, Q ₄Collector electrode join.Another road is through diode D ₁Be connected respectively to end points J and diode D ₂, Q ₃Emitter one tunnel ground connection, another road is through diode D ₂, D ₄(Liang person And connects), D ₃, resistance R ₁₆(both serial connections are connected respectively to end points K and resistance R ₁₄With Q ₄Collector electrode between.

Above-mentioned freq converting circuit, electronic switching circuit also can be made into integrated circuit block, and described terminal A～K is respectively the pin of integrated circuit block.

Above-mentioned transistor Q ₁～Q ₉Be NPN type high-frequency triode, diode D ₁～D ₁Be high-frequency diode, resistance R ₁～R ₁₆Resistance be respectively 1K Ω (± 20%)～120K Ω (± 20%), capacitor C ₁～C ₉Capacity be respectively 0.01 μ F (± 20%)～4700PF (± 20%), inductance L is about 10 μ H, the frequency of quartz crystal unit Z is about 0.5MHZ.

Colour TV of the present utility model is simple in structure with the standard frequency converter, cost is low, easy to use, can make the single system colour TV make the multi-modulation scheme colour TV, and can change automatically, also can form a full system type pictorial colour TV receiver sound intermediate frequency in addition and handle and the colour decoding subcarrier switching, be applicable to the color television set of various models with integrated package CD4066 and discrete component.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is a functional-block diagram of the present utility model.

Fig. 2 is the electronic-circuit diagram of freq converting circuit of the present utility model.

Fig. 3 is the electronic-circuit diagram of the utility model electronic switching circuit.

As shown in Figure 1, when sound intermediate frequency (converts intermediate frequency (6MHZ) signal in 6MHZ intermediate-freuqncy signal and the mixting circuit to and enters high-speed switching circuit after synthetic after 5.5MHZ～6.5MHZ) signal is input to freq converting circuit, when the control signal in entering high-speed switching circuit changes, produce corresponding unlike signal and enter the sound accompaniment frequency-discriminating circuit, make it switch 4 with changing because control signal enters electronic switching circuit.43MHZ, 3.58MHZ crystal oscillator frequency produce different signals and enter colour decoding circuit, handle and the colour decoding subcarrier switching thereby form full system type pictorial colour TV sound intermediate frequency, make the single system colour TV can make the multi-modulation scheme colour TV, and can change automatically.

As shown in Figure 2, capacitor C ₁Be connected between terminal A, the B.Terminal A connects+the 12V power supply, terminal B ground connection.Quartz crystal unit Z, resistance R ₁Capacitor C ₂, C ₃(both are connected in series) And and meet back one end and transistor Q ₄Base stage join.Other end ground connection, resistance R ₂Be connected Q ₄Base stage and collector electrode between.Resistance R ₄, capacitor C ₁Serial connection back one end and Q ₄Collector electrode join, the other end connects respectively+12V power supply and ground connection, resistance R, an end is connected C ₂, C ₃Between, the other end is connected Q ₄Emitter and resistance R, between.R, other end ground connection, capacitor C ₃One terminates at Q ₁Emitter and R ₃Between, the other end is connected transistor Q ₂Base stage and capacitor C, between.C, another termination end points C, end points C connects input (being the accompanying sound intermediate frequency signal circuit).Q _eBase stage also be connected to resistance R ₆, R ₇, R ₆, R ₇The other end connect respectively+the 12V power supply and ground, Q _eEmitter through resistance R ₉, capacitor C ₉(Liang person And connects) ground connection, Q _eCollector electrode be connected to resistance R ₈, inductance L (Liang person And connects), R ₈, L another termination+12V power supply, capacitor C ₆One termination inductance L, a road of the other end meets end points D, and end points D connects output (being high-speed switching circuit), and another road is through capacitor C ₈Ground connection

A termination+12V power supply among the figure, the C end is signal input part, when the D end is worked for signal output part, by Z, R ₁, R ₂, R ₃, C ₂, C ₃Form an oscillator, frequency is f ₁Pass through C ₅With add input signal F and be mixed into Q ₂Carry out mixing and amplify, at this moment frequency is f ₁+ F _SrPerhaps be f ₁-F _Sr, these two kinds of mixed frequency signals are by L, C ₆, C ₈The LC filter network of forming obtains required signal F _ScFrom the output of D end.

As shown in Figure 3, resistance R ₁₀One another termination transistor of termination end points E (end points E connects the vision signal amplifying circuit) Q ₃Base stage, Q ₃Collector electrode be connected end points I and resistance R ₁₃, between, end points I connects+the 12V power supply, R ₁₃, with diode D ₁Be connected to Q after the serial connection ₃Collector electrode,, its grounded emitter, D ₁The other end be connected end points J and diode D ₂Between, another termination quartz crystal unit 1 (not marking among the figure) of end points J, D ₂Other end ground connection, resistance R ₁₅, diode D, serial connection back one end is connected R ₁₄With transistor Q ₄Collector electrode between, the other end is connected diode D ₄And between the end points K.D ₄Other end ground connection.End points K connects quartz crystal unit 2 (not marking among the figure).Q ₄Collector electrode meet end points H, end points H connects colour decoding circuit, Q ₄Base stage through resistance R ₁₃Meet end points G, end points G connects high-speed switching circuit, grounded emitter.

I termination+12V power supply among the figure, F holds ground connection, during work, when E termination high level, during G termination low level, Q then ₃Saturated, Q ₄End, the H end is high level, makes D ₃, D ₄Conducting, at this moment K end is low level, when E termination low level, during G termination low level, C then ₃End, the H end is low level, Q ₃End D ₁, D ₂Conducting, then the J end is low level.When E, G end all connects high level, Q ₃, Q ₄Saturated, the H end is low level, Q ₃End D ₁D ₂Conducting, then the J end is low level.When E termination low level, during G termination high level, Q ₄Saturated, the H end is level, Q ₃End D ₁, D ₂Conducting, then the J end is low level.

Claims (3)

1. a colour TV standard frequency converter comprises mixting circuit, high-speed switching circuit, sound accompaniment frequency-discriminating circuit, colour decoding circuit, it is characterized in that also comprising:

A. one by capacitor C ₁～C ₉, resistance R ₁～R ₉, transistor Q ₁～Q ₂, the freq converting circuit that constitutes of quartz crystal unit Z, inductance L, terminal A～D, wherein: transistor Q ₁Base stage one tunnel and capacitor C ₂, C ₉(both serial connections), resistance R ₁, quartz crystal unit Z And is connected to terminal B, (capacitor C after connecing ₁And is connected between terminal A, the B), another road is through resistance R ₂With Q ₄A road the joining of collector electrode, another road of collector electrode is respectively through resistance R ₄, capacitor C ₄Join Q with terminal A and ground ₄Emitter through resistance R, receive terminal B and earth potential respectively, resistance R, an end be connected C ₂, C ₃Between, the other end is connected resistance R, with Q ₁Emitter between transistor Q ₂Base stage respectively through R ₆, R ₇(both serial connection), capacitor C are with the end points C Q that joins _eCollector electrode respectively through resistance R ₂, inductance L (Liang person And connects), capacitor C ₆D joins with end points, and emitter is through resistance R ₉, capacitor C, (Liang person And connects) ground connection, capacitor C ₆One end and end points D join, other end ground connection, capacitor C, an end and Q ₂Base stage join the other end and Q ₁Emitter join;

B. one by resistance R ₁₀～R ₁₆, transistor Q ₃～Q ₅, diode D ₁～D ₄, the electronic switching circuit that constitutes of end points E～K, wherein: transistor Q ₃Base stage through resistance R ₁₀E joins with end points, emitter a road through resistance R ₁₁Difference ground connection and end points F, another road is through resistance R ₁₂, R ₁₄Respectively with transistor Q ₄Collector electrode, end points H, transistor Q, base stage join transistor Q ₄Base stage through resistance R ₁₃G joins with end points,, grounded emitter, transistor Q ₃Collector electrode one tunnel through resistance R ₁, respectively with end points I, Q ₄Collector electrode join, another road is through diode D ₁Be connected respectively to end points J and diode D ₂, Q ₃Emitter one tunnel ground connection, another road is through diode D ₂, D ₄(Liang person And connects), D ₃, resistance R ₁₆(both serial connections) is connected respectively to end points K and R ₁₄With Q ₄Collector electrode between.

2. by the described colour TV of claim 1 standard frequency converter, it is characterized in that above-mentioned freq converting circuit, electronic switching circuit also can be made into integrated circuit block, described terminal A～K is respectively the pin in the integrated circuit block.

3. by the described colour TV of claim 1 standard frequency converter, it is characterized in that described transistor Q ₁～Q ₅Be NPN type high-frequency triode, diode D ₁～D ₄Be high-frequency diode, resistance R ₁～R ₁₆Resistance be respectively 1K Ω (± 20%)～120K Ω (± 20%), capacitor C ₁～C ₈Capacity be respectively 0.01 μ F (± 20%)～4700PF (± 20%), inductance L is about 10 μ H, the frequency of quartz crystal unit Z is about 0.5MHZ.

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