CN2372857Y

CN2372857Y - Wireless signal transmitting-receiving active loudspeaker box

Info

Publication number: CN2372857Y
Application number: CN 99235765
Authority: CN
Inventors: 张少持
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-04-07
Filing date: 1999-04-07
Publication date: 2000-04-05
Anticipated expiration: 2009-04-07

Abstract

The utility model relates to a wireless-signal and transmitting-receiving active loudspeaker box, which comprises a box body, a tweeter and a woofer. The utility model is characterized in that the wireless-signal and transmitting-receiving active loudspeaker box is also provided with a wireless transmitting circuit, a wireless receiving circuit and an efficiency circuit, large numbers of amplifying input signals fed by a power amplifier are fed to the wireless transmitting circuit, the wireless receiving circuit receives signals which are transmitted by the wireless transmitting circuit, and the signals are output and fed to a power amplification circuit. The utility model has the advantages of reasonable wiring, stabile reception, small distortion, strong anti-interference ability and convenient installation and operation, can not damage the upholstery, transmits the sound signals by the transmission and the reception of the wireless frequency modulation, and does not need to use a sound source wire.

Description

Wireless signal transmits and receives active audio amplifier

The utility model relates to a kind of audio amplifier, and particularly a kind of wireless signal transmits and receives active audio amplifier.

Present most home audio or household audio and video system all are with holding wire voice signal to be passed to audio amplifier.There is following shortcoming in this type of audio amplifier: (1) difficult wiring, the overall aesthetic of destruction interior decoration; (2) cleaning difficulty is because the house wiring majority except sweep the floor can cause obstruction the easier personnel that trip in last walking through drawing on the ground.

The purpose of this utility model be to provide a kind of circuit rationally, receive stable, do not destroy upholster, the wireless signal that need not the sound source wire transmission signals transmits and receives active audio amplifier.

The purpose of this utility model can reach by following measure: the utility model comprises casing, high pitch loudspeaker, woofer, it is characterized in that: also have radio transmitter, wireless receiving circuit, effect circuit, deliver to radio transmitter by the preceding amount amplification input signal that power amplifier is sent here, wireless receiving circuit receives the signal by the radio transmitter emission, and power amplifier is delivered in its output.

The purpose of this utility model can also reach by following measure: the wiring board of radio transmitter places in the power amplifier, and the wiring board of wireless receiving circuit and power amplifier places in the casing.The preposition amplification input signal of sending from power amplifier is delivered to 5 pin of integrated circuit (IC) 2 radio transmitter by resistance R 205, R206, inductance 404, resistance 207, electric capacity 320, and the 9 pin output frequency modulation of IC2 transmits and delivers to wireless 901 by inductance 408, capacitor C 25.12 pin of integrated circuit (IC) 4 join with reception antenna 902 by electric capacity 336,337,340, inductance 402 in the wireless receiving circuit, 16 pin of IC4 are by linking to each other with the collector electrode of triode 602 by electric capacity 332, the base stage of triode 602 links to each other with the base stage of triode 601, and the emitter-base bandgap grading of triode 601 links to each other with 1 pin of integrated circuit (IC) 3 by electric capacity 331.The model of integrated circuit (IC) 2 is MC2833, and the model of IC4 is TD A7021.

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

Fig. 2 is a contour structures schematic diagram of the present utility model;

Fig. 3 is the electrical schematic diagram of the utility model radiating portion;

Fig. 4 is the electrical schematic diagram of the utility model receiving unit.

The utility model is described in further detail below in conjunction with accompanying drawing (embodiment):

With reference to Fig. 1, Fig. 2, the utility model is made up of casing 1, high pitch loudspeaker 2, woofer 3, radio transmitter 4, wireless receiving circuit 5, power amplifier 6 etc.The wiring board of wireless portion places in the power amplifier; The wiring board of wireless receiving part places in the casing 1; High pitch loudspeaker 2, woofer 3 also are housed in the casing 1.

With reference to Fig. 3, design based on frequency modulation wireless transmission and reception, the MC2833 that integrated circuit (IC) 2 adopts Motorola Inc. to produce, IC2 is as reflector, with the signal of originally importing left and right acoustic channels take out mixed again after, promptly become substantially around sound signal, send into again IC2 signal is amplified and be modulated into FM signal after launched, effect integrated circuit (IC) 1 model is TEA2025.1 pin of IC2 is that local oscillations end, 2 pin are that inverting input, 3 pin are that preposition input, 5 pin are that preposition amplification input, 6,7,11 pin are that earth terminal, 8 pin are that frequency modulation output, 9 pin are that frequency modulation transmitting terminal, 10 pin are power end, end, 13 pin are that intermediate frequency adjustment end, 14,15 pin are that High frequency filter end, 16 pin are the local oscillator end to 12 pin frequently for control for modulation input, 4 pin.

With reference to Fig. 4, the TDA7021TIC that integrated circuit (IC) 4 adopts PHILIPS Co. to produce, IC4 has FLL circuit (frequency locked loop), and distortion is low; Be enough to the power amplifier integrate circuit IC3 (model TEA2025) that promotes to join with it by the voltage of 16 pin of IC4 output.1 pin of IC4 is that demodulation bias terminal, 2,14,15 pin are that electrostatic control end, 3,4 pin are that earth terminal, 5 pin are that local oscillator end, 6 pin exceed frequently that end, 7,8,10,11 pin are that filtering end, 9 pin are that voltage input end, 12 pin are that high frequency input terminal, 13 pin are that High frequency filter end, 16 pin are reversed-phase output.

The utility model has following advantage compared to existing technology: circuit is reasonable, reception is stable, Distortion is little, can not interfere with each other with fluorescent lamp, household electrical appliance etc.; And can not destroy indoor dress Semi-annular jade pendant, easy to install, need not sound source wire transmission voice signal.

Claims

1, a kind of wireless signal transmits and receives active audio amplifier, comprise casing (1), high pitch loudspeaker (2), woofer (3), it is characterized in that: also have radio transmitter (4), wireless receiving circuit (5), effect circuit (6), deliver to radio transmitter (4) by the preceding amount amplification input signal that power amplifier is sent here, wireless receiving circuit (5) receives the signal by radio transmitter (4) emission, and power amplifier (6) is delivered in its output.

2, audio amplifier according to claim 1 is characterized in that: the wiring board of radio transmitter (4) places in the power amplifier, and the wiring board of wireless receiving circuit (5) and power amplifier (6) places in the casing (1).

3, audio amplifier according to claim 1, it is characterized in that: the preposition amplification input signal of sending from power amplifier is delivered to 5 pin of integrated circuit (IC) 2 radio transmitter by resistance R 205, R206, inductance 404, resistance 207, electric capacity 320, and the 9 pin output frequency modulation of IC2 transmits and delivers to wireless 901 by inductance 408, capacitor C 25.

4, audio amplifier according to claim 1, it is characterized in that: 12 pin of integrated circuit (IC) 4 join with reception antenna 902 by electric capacity 336,337,340, inductance 402 in the wireless receiving circuit, 16 pin of IC4 are by linking to each other with the collector electrode of triode 602 by electric capacity 332, the base stage of triode 602 links to each other with the base stage of triode 601, and the emitter-base bandgap grading of triode 601 links to each other with 1 pin of integrated circuit (IC) 3 by electric capacity 331.

5, audio amplifier according to claim 1 is characterized in that: the model of integrated circuit (IC) 2 is MC2833, and the model of IC4 is TDA7021.