CN2111602U - Tv broadcast receiver with kara ok device - Google Patents

Abstract

The utility model discloses a TV broadcast receiver with a Kara OK device, which relates to the technical improvement of a sound system of a TV broadcast receiver. A sound system of a TV is additionally provided with a sounding input circuit, and particularly a delay system is added to the sounding input circuit. Echo effect which is similar to the effect in a Kara OK hall can be obtained for people who have recreation at home, three attached devices are reduced, and the application range is widened for the TV.

Description

TV broadcast receiver with kara OK device

A kind of TV-set broadcasting receiver that has Caraok device relates to the improvement of the sound system technology of TV-set broadcasting receiver.

Along with the raising of China's people's lives, the entertainment way of Karaoke just progressively enters family.Owing to all do not have this type of device on the present television set, the user wants to carry out this class activity at home, must possess television set is arranged (1), video recorder (2), karaoke machine (3) simultaneously, output amplifier (4) and audio amplifier five kinds of equipment such as (loudspeaker), it connects block diagram as shown in Figure 1.Because equipment is many, each equipment room on line complexity must be placed with more place, adds the economic dispatch reason, and general family is difficult to realize.

In order to reduce equipment needed thereby, reduce numerous and diverse on line of each equipment room, reduce the economy spending for this reason of general family, the utility model has adopted karaoke machine, output amplifier and three kinds of equipment of audio amplifier has been combined into a single unit system, be linked in the sound system of TV-set broadcasting receiver, make full use of the existing facility of television set own, Karaoke terminal socket need only be stayed on the TV shell, people just can carry out amusement easily, greatly reduce economic spending.

The utility model is achieved in that and adds sound equipment input circuit (5) in the sound system of TV-set broadcasting receiver, this loop is by power supply circuits, preamplifier is through coupling capacitance, sampling resistor is formed, the audio signal (7) that people's sound is imported with video recorder through this sound equipment input circuit by microphone inserts in the sound accompaniment power amplifier of former television set, send from the loudspeaker of television set together then, its circuit block diagram as shown in Figure 2.

Reach the echo effect of music hall for the tonequality that can make mixing, on the basis of foregoing circuit, between the preamplifier of sound equipment input circuit and television audio power amplifier, insert one by low pass filter (9), the sound delay time system (shown in Fig. 3 block diagram) that time delay device (10) and output amplifier (8) are formed, the sound of sending into from microphone is divided after entering this sound equipment input circuit make two-way, one the tunnel directly enters the television audio power amplifier by output amplifier (8) as direct sound wave, another road is through low pass filter (9), time delay device (10) back enters the television audio power amplifier by output amplifier (8) as delay sound, makes it form a kind of echo effect after stack.Selection to delay device, both can adopt BBD delayer as shown in Figure 4 by controller clock signal CLK control, also can adopt digital signal processing module (14), A/D(15 as shown in Figure 5 by microprocessor), D/A(16) modular converter and RAM(17) the digital delayer formed.

Owing to inserted the sound equipment input circuit, with being connected of the sound system of television set, will consider influence and the effect of different Core of TV set plates to it.Particularly, need to adopt power supply circuits and the audio frequency isolating device that uses separately, the ground wire of two class circuit separated for hot movement (being the charged class of base plate), to prevent because the charged entertainer's of jeopardizing of Karaoke terminal socket safety and influencing each other to circuit.The power supply circuits that sound equipment input circuit of the present utility model is adopted as shown in Figure 8, make two-way from dividing after TV set power is taken out alternating voltage 12Vac, one the tunnel through the rectification of V1 forward, export positive supply+Vcc behind the filter filtering of forming by C11, R10, C8, C9, be connected to the positive pole of preamplifier; Another road is exported the negative pole that negative supply-Vcc inserts preamplifier and is powered after the reverse rectification of V2 behind the filter filtering of being made of C14, R12, C12, C13.The output of the mixed audio signal after direct sound wave signal and the stack of delay acoustical signal, then adopt through capacitor C 18 and be coupled to the output amplifier of forming by R25, R26, N1C, the multiplication factor of this moment is Av=R26/R25, signal after the amplification is coupled through C19 again, delivering to the audio frequency isolating device after the R9 sampling is among the audio frequency transformer T1, this moment, the transformation ratio of T1 was 1:1, delivered to R11 again and entered the television audio power amplifier and transport to loud speaker.In order to reduce the insertion loss, the audio frequency isolating device also can adopt photoelectrical coupler substituted audio transformer, and its function is the same.

Below in conjunction with accompanying drawing in detail its specific embodiment is described in detail:

Fig. 1 is the conventional general connection layout of realizing the Karaoke mode;

Fig. 2 be the utility model the plain type application circuit block diagram in practicable when Karaoke;

Fig. 3 is the circuit block diagram that adopts delay system;

Fig. 4 is the circuit block diagram that adopts the BBD delayer;

Fig. 5 is the circuit block diagram that adopts digital-to-analogue conversion mode delayer;

Fig. 6 is a plain type application circuit described in the utility model;

Fig. 7 is the application circuit that adopts the BBD delay system;

Fig. 8 is the power supply circuits of sound equipment input circuit.

See from Fig. 6, one road preamplifier is by C1, R1, R3, R5 and N1A(operational amplifier spare unit) form, its multiplication factor is Av=R5/R3, signal is sent into preamplifier from MIC, after amplifying, send in the audio frequency transformer by the R9 sampling through the C6 coupling, deliver to the television audio power amplifier by the R11 coupling again.The rest may be inferred equally on another road.

See in the circuit of the BBD delay system that adopts according to Fig. 7, one road MIC signal is delivered to sample resistance R13 via the preamplifier that C1, R1, R3, R5, NIA form, be coupled to by R17, C4, C5, R15, R16, R18, N2A(operational amplifier unit by C3) the active second-order low-pass filter formed, be coupled to the input of BBD again through C10, here BBD is a scoop-like electric charge coupling time delay device, simultaneously, BBD is subjected to the control of clock driver CLK.Signal through the BBD time-delay is coupled to the low fortune of the active second order filter of being made up of R20, C17, R22, C16, R21, R23, N2B by C15, again after R24 does positive feedback, be coupled in the output amplifier of forming by R25, R26, N1C through C18 with signal without time-delay, the multiplication factor of this output amplifier is Av=R26/R25, signal is coupled through C19 again, by delivering to audio frequency isolating device audio frequency transformer T1 after R9, the R27 sampling, its transformation ratio is 1:1.Last signal is transported to the loud speaker of television set after R11 is coupled to the amplification of television audio power amplifier.

The utility model inserts this sound equipment input circuit in the common TV broadcasting receiver, particularly inserted the sound equipment input circuit that has time-delay acoustic-electric road, promptly three kinds of equipment can when carrying out the Karaoke amusement, have been omitted, the consequent economic pressures of general family have been alleviated, improve the range of application of television set itself again, enlivened people's culture life.

Claims (5)

1, a kind of TV-set broadcasting receiver that has Caraok device, it is characterized in that in the sound system of TV-set broadcasting receiver, adding the sound equipment input circuit of forming through the coupling capacitance sampling resistor by power supply circuits, preamplifier, and after sample resistance R9 sampling, deliver among the audio frequency isolating device T1.

2, according to the said TV-set broadcasting receiver of claim 1, the power supply circuits that it is characterized in that said sound equipment input circuit are to be divided into the two-way rectification by alternating voltage 12Vac, one the tunnel does the forward rectification through V1, export positive supply+Vcc behind the filter filtering of forming by C11, R10, C8, C9, export negative supply-Vcc behind one tunnel the filter filtering, be connected to the N1(operational amplifier respectively through forming by C14, R12, C12, C13 after the reverse rectification of V2) positive and negative terminal of power supply input.

3, according to claim 1,2 said TV-set broadcasting receiver, it is characterized in that at said preamplifier after the R13 sampling, insert by R15 through the C3 coupling again, C5, R17, C4, R16, R18, the active second-order low-pass filter that N2A forms, be coupled to the input of time delay device through C10, signal after the delay is coupled to by R20 through C15, C17, C16, R22, R23, the active second-order low-pass filter of another grade that N2B forms, after doing positive feedback, R24 delivers to by R25 through coupling capacitance C18 with not delayed signal, R26, the multiplication factor that N1C forms is the output amplifier of Av=R26/R25, is coupled to the R9 sampling through C19 again and delivers in the audio frequency isolating device and go.

4, according to the said TV-set broadcasting receiver of claim 3, it is characterized in that said time delay device can be the BBD delayer by controller clock signal CLK control, also can be by microprocessor, digital signal processing module (14), A/D(15), D/A(16) modular converter RAM(17) the digital time delay device formed.

5, according to the said TV-set broadcasting receiver of claim 1, it is characterized in that said audio frequency isolating device T1, can be audio frequency transformer, also can be photoelectrical coupler.

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