CN2390366Y

CN2390366Y - Portable radio acoustic device

Info

Publication number: CN2390366Y
Application number: CN 99248344
Authority: CN
Inventors: 刘宁; 樊明延; 郝清
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-10-12
Filing date: 1999-10-12
Publication date: 2000-08-02
Anticipated expiration: 2009-10-12

Abstract

The utility model refers to a point-to-multipoint portable radio sound conducting apparatus with sound conduction by a radio microphone and a radio earphone. A radio frequency signal which is output from the microphone, connected with an IC4 phase locking loop of an integrated circuit to be modulated after magnified by a first stage amplifier BG1, and output by the IC4 phase locking loop to radio frequency to be modulated and generates secondary modulation is emitted through an antennas. The input signal of a receiving circuit is demodulated by the radio frequency, and a primary demodulated signal produced is shaped by a voltage comparator IC2 of which the output terminal is connected to a phase locking loop of an integrated circuit IC1 for phase demodulation; then the phase demodulation output of the IC1 is demodulated by a low pass BG2 to create an output audio signal which drives a loudspeaker SP to sound after the power is amplified by an integrated circuit IC3. The utility model is suitable for movable sound amplification and transmission in public places, such as museums, tourist spots, etc.

Description

The portable mobile wireless sound conducting apparatus

The utility model relates to a kind of some portable mobile wireless sound conducting apparatus to multiple spot that is carried out acoustic by wireless Mike and wireless headset.

There is dual mode in the acoustic system of public arena at present, and the one, adopt public address equipment, sound is not had by loudspeaker or audio amplifier non-directional selectively pass to the audience; The 2nd, adopt the wireless device of fixed transmission and mobile receiving device formation receive-transmit system to propagate sound, the former shortcoming is that environment is produced noise pollution, and audience's audibility can't guarantee serious interference between the different sources of sound; Though the latter has solved the noise pollution problem to a certain extent, owing to do not consider the phase mutual interference of different user groups, its application is restricted, can only there be a transmitting station in the certain space scope, be not easy to mobile acoustic.

General acoustic equipment deficiency mainly is the acoustic non-directional, non-selectivity, and the shortcoming of Fixed Wireless System is not consider multi-user's problem, be not easy to multitone source acoustic and mobile acoustic, in view of this, how to provide a kind of multi-user to organize noiseless multitone source acoustic and mobile acoustic, and simple in structure, volume is small and exquisite, and the utility model grinds wound motivation place just.

The utility model designer relies on the practical experience of being engaged in fields such as all kinds of wireless acoustic equipment research production and processing for many years, on the basis of feasibility study repeatedly, does a brand-new design and constitutes, and gets generation of the present utility model eventually.

At the deficiencies in the prior art, this novel purpose is a kind of portable mobile wireless sound conducting apparatus of design, can realize that multitone source acoustic does not disturb each other mutually, and simple in structure, easy to use.

The purpose of this utility model can be by following realization, the utility model radiating circuit is connected to integrated circuit (IC) 4 phase-locked loop modulation after being amplified through one-level amplifier BG1 by microphone output, Phase Lock Loop IC 4 outputs to rf modulations, and the radiofrequency signal that produces secondary modulation is launched by antenna; Receiving circuit through the input signal of radio demodulating through voltage comparator ic 2 shapings, its output is connected to integrated circuit (IC) 1 phase-locked loop phase demodulation, the output of IC1 phase demodulation demodulates output audio signal through low pass BG2, pronounces through integrated circuit (IC) 3 power amplification rear drive loud speaker SP again.

The utility model is further characterized in that one-level amplifier BG1 is that triode constitutes; On integrated circuit (IC) 4 phase-locked loop pins, directly be connected with capacitor C 1 and resistance R 1, R2; On integrated circuit (IC) 1 phase-locked loop pin, directly be connected with capacitor C 4 and resistance R 9, R10; Capacitor C 1 is corresponding respectively equivalent with the capacitance-resistance value of C4, resistance R 1 and R9, resistance R 2 and R10.

It is simple to the utlity model has (1) circuit, and volume is little, and is low in energy consumption; (2) change of modulating frequency only need change resistance or the capacitance component value gets final product, and can realize producing in batches, avoids manual setting; (3) anti-interference strong with the noise ability, distortion is little; (4) secondary demodulation is simple, and is strong to the inhibition ability of other channels, realizes the different cross-talks of frequently promptly not having.

Further illustrate the utility model embodiment below in conjunction with accompanying drawing.

Fig. 1 is the utility model radiating circuit structure chart.

Fig. 2 is the utility model receiving circuit structure chart.

The utility model adopts the principle of frequency division multiplexing, audio signal is through the low frequency premodulated, again through unified high frequency modulated emission, all users' radio frequency transmit and receive circuit is all consistent like this, and just the capacitance-resistance parameter difference of low-pass filter circuit is selected corresponding audio signal, farthest make circuit structure consistent, the control of quality of being convenient to produce in batches with components and parts; Modulation system adopts frequency modulation, can adopt the low-frequency phase-locking ring integrated circuit to reduce the complexity of volume, power consumption and circuit, its demodulation performance is also very superior simultaneously, good loop filtering design can realize that intensive frequency distributes and nothing is crosstalked, the spreading gain that the frequency modulation standard itself is brought has improved antijamming capability.

The utility model specifically is made of radiating circuit and receiving circuit, radiating circuit is connected to integrated circuit (IC) 4 phase-locked loop modulation after being amplified through one-level amplifier BG1 by microphone MIC output, IC4 can adopt model C D4046, Phase Lock Loop IC 1 outputs to the single tube voltage controlled oscillator, the voltage-controlled frequency modulation radio frequency of single tube that produces is by antenna T emission, antenna adopts the ring-type magnetic dipole, to reduce volume and to increase radiation efficiency; Receiving circuit is through radio demodulating, a demodulation voltage signal that produces is through voltage comparator ic 2 shapings, integrated circuit (IC) 2 can adopt model LM311, its output is connected to integrated circuit (IC) 1 phase-locked loop phase demodulation, integrated circuit (IC) 1 preferably adopts and integrated circuit (IC) 4 same model, the output of IC1 phase demodulation demodulates output audio signal through low-pass filtering BG2, the active low pass that low pass filter adopts triode BG2 and resistance R 11, capacitor C 5 to constitute, the low pass audio signal is pronounced through integrated circuit (IC) 3 power amplification rear drive loud speaker SP again.

The utility model is further characterized in that one-level amplifier BG1 is that triode constitutes; On integrated circuit (IC) 4 phase-locked loop pins, directly be connected with capacitor C 1 and resistance R 1, R2 determine frequency of oscillation, on integrated circuit (IC) 1 phase-locked loop pin, directly be connected with capacitor C 4 and resistance R 9, R10 equally; Capacitor C 1 is corresponding respectively equivalent with the capacitance-resistance value of C4, resistance R 1 and R9, resistance R 2 and R10, to keep the consistency of modulation and demodulation, improves machine performance.

In sum, basis is novel can utilize simple structural design, make the utility model can realize the noiseless acoustic of multi-user, volume is little, carry, easy to use, be particularly suitable for public places such as museum, exhibition center, tourist district and movably amplify transaudient, different sound sources amplify, and do not disturb mutually.Obviously the utility model is the new design of a kind of novelty, progress and dark tool practicality.The above is specific embodiment of the utility model and the know-why used, if the equivalence of doing according to conception of the present utility model changes, when the function that it produced does not exceed spiritual that specification and accompanying drawing contain yet, all should be in scope of the present utility model, explanation hereby.

Claims

1, a kind of portable mobile wireless sound conducting apparatus is characterized in that Phase Lock Loop IC 4 outputs to rf modulations by being connected to integrated circuit (IC) 4 phase-locked loop modulation after the microphone output process one-level amplifier BG1 amplification, and the radiofrequency signal that produces secondary modulation is launched by antenna; Receiving circuit through the input signal of radio demodulating through voltage comparator ic 2 shapings, its output is connected to integrated circuit (IC) 1 phase-locked loop phase demodulation, the output of IC1 phase demodulation demodulates output audio signal through low pass BG2, pronounces through integrated circuit (IC) 3 power amplification rear drive loud speaker SP again.

2, portable mobile wireless sound conducting apparatus according to claim 1 is characterized in that one-level amplifier BG1 is that triode constitutes.

3, portable mobile wireless sound conducting apparatus according to claim 1 is characterized in that directly being connected with capacitor C 1 and resistance R 1, R2 on integrated circuit (IC) 4 phase-locked loop pins.

4, portable mobile wireless sound conducting apparatus according to claim 1 is characterized in that directly being connected with capacitor C 4 and resistance R 9, R10 on integrated circuit (IC) 1 phase-locked loop pin.

5,, it is characterized in that capacitor C 1 is corresponding respectively equivalent with the capacitance-resistance value of C4, resistance R 1 and R9, resistance R 2 and R10 according to claim 3 or 4 described portable mobile wireless sound conducting apparatus.