CN2465399Y

CN2465399Y - Portable multi-function radio receiver

Info

Publication number: CN2465399Y
Application number: CN 01200239
Authority: CN
Inventors: 刘宁; 郝清; 樊明延
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-02-16
Filing date: 2001-02-16
Publication date: 2001-12-12
Anticipated expiration: 2011-02-16

Abstract

The utility model relates to a portable, multifunctional and wireless sound conduction device which uses a wireless microphone and a wireless receiver to conduct sound, and one point points to a plurality of points. Frequency modulated signals transmitted by the wireless microphone are sent into an electric tuning frequency modulation monolithic receiving integrated circuit IC1 with automatic frequency control by an earphone antenna through an earphone socket J1. When a switch SW4 is positioned at a sound conduction position, IC1 only receives signals within the range of sound conduction frequency. When the SW4 is positioned at a sound receiving position, a receiver can listen broadcast of frequency modulation radio stations. The utility model can accomplish multi-user non-interference sound conduction. The utility model has the advantages of small size and good sound quality, and is especially suitable for movable sound conduction at public spaces of museums, exhibition buildings, tourist attractions, etc.

Description

The portable mobile wireless multi function receiver

The utility model relates to a kind of any portable portable mobile wireless multi function receiver to multiple spot that is carried out acoustic by wireless Mike and wireless receiver.

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 fixed transmission ground wireless device and mobile receiving device to constitute receive-transmit system and 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; And can only receive the receiver of the simple function of acoustic signal, its cost performance is lower, is unfavorable for that the user uses and marketing.

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, is 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, multi-functional, high performance-price ratio, and it is simple in structure, volume is small and exquisite, and tonequality is good, and the utility model grinds wound motivation place just.

The utility model designer relies on the practical experience of being engaged in all kinds of wireless acoustic equipment research production and processings field for many years, on the basis of feasibility study repeatedly, has done new design structure, gets generation of the present utility model eventually.

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

The purpose of this utility model can be by following realization, the utility model comprises antenna, integrated circuit, input circuit, power amplification circuit, frequency selection circuit and the scanning circuit that resets, and is characterised in that the frequency selection circuit that becomes connection in series-parallel to be combined to form in integrated circuit frequency base pin selection connection switch SW 4 and a plurality of capacitance group.

The utility model is further characterized in that with earphone cord as antenna; The FM signal that antenna is introduced wireless Mike emission is sent into electric tuning automatic frequency control frequency modulation monolithic receiving integrate circuit IC1 by the input circuit that earphone socket J1 and L3, C14, C15, C5 form; Switch SW 4 and C19 join select the acoustic frequency range and with C20 Phase Receiver audio section; Receive the signal of wireless Mike and f-m broadcast station respectively, the audio signal output that integrated circuit (IC) 1 demodulates promotes the earphone pronunciation through the power amplification circuit of triode BG1 and BG2 formation.The scanning circuit that resets is connected integrated circuit (IC) 1 with scanning switch SW2 shunt capacitance C13 and is constituted by reset switch SW3 and capacitor C 9 integrated circuit (IC) 1 that is connected in parallel; To reset by reset switch (SW3) earlier when selecting channel, use scanning switch (SW2) realization channel search from low to high again.Three joints of SW4 connect capacitor C 19, C20 and C8 respectively, between 2,3 pin of C20 connection and SW4.When switch SW 4 was positioned at the acoustic position, C8 and C20 had determined the dynamic range of frequency jointly, and C19 has determined the centre frequency of frequency search, made IC1 receive only the interior signal of acoustic frequency range.When SW4 was positioned at the radio reception position, C8 worked independently, and had determined frequency search range, made receiver can listen to the broadcasting of FM radio station.

It is simple to the utlity model has (1) circuit, and volume is little, low in energy consumption; (2) select radio reception and acoustic by the channel diverter switch, enrich product function; (3) antijamming capability is strong, and tonequality is good; (4) realize that by ball bearing made using multichannel does not have cross-talk.

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

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

The utility model adopts electric tuning automatic frequency control frequency modulation monolithic receiving integrate circuit, receive the frequency modulation wireless signal of frequency division multiplexing, by the channel diverter switch, during selective reception acoustic signal, by the frequency band of selection capacitor C 19, C20 and C8 and L4 control received signal, and the sweep speed of electric scanning, guarantee enough close number of channels, because IC1 adopts the AFC technology, can guarantee to receive and stablize, stronger cross talk resistance energy is arranged.Adopt the frequency modulation system to improve antijamming capability, reach reasonable tonequality.

The utility model with earphone cord as antenna, the input circuit that the FM signal of wireless Mike emission is formed through earphone socket J1 and L3, C14, C15, C5 by antenna is sent into 11,12 pin of electric tuning automatic frequency control frequency modulation monolithic receiving integrate circuit IC1, IC1 can adopt TDA7088, select acoustic frequency range (joining) and radio reception frequency range (joining) by switch SW 4 with C20 with C19, receive the signal of wireless Mike and f-m broadcast station respectively, the audio signal that demodulates promotes the earphone pronunciation from the amplification of 2 pin output through BG1 and BG2.To reset by reset switch (SW3) earlier when selecting channel, use scanning switch (SW2) realization channel search from low to high again.Three joints of SW4 connect C19, C20 and C8 respectively, between 2,3 pin of C20 connection and SW4.When switch SW 4 was positioned at the acoustic position, C8 and C20 had determined the dynamic range of frequency jointly, and C19 has determined the centre frequency of frequency search, made IC1 receive only the interior signal of acoustic frequency range.When SW4 was positioned at the radio reception position, C8 worked independently, and had determined frequency search range, made receiver can listen to the broadcasting of FM radio station.

In sum, basis is novel can utilize simple structural design, make the utility model can realize the noiseless acoustic of multi-user, the low-cost wireless frequency modulation platform signal that receives, volume is little, carry, easy to use, be particularly suitable for and public places such as museum, exhibition center, the tourist district acoustic that movably amplifies, different sources of sound do not disturb mutually.Obviously the utility model is the new design of a kind of novelty, progress and tool practicality.The above is specific embodiment of the utility model and the principle used, if the equivalence of making 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 multi function receiver, comprise antenna, integrated circuit, input circuit, power amplification circuit, frequency selection circuit and the scanning circuit that resets, be characterised in that the frequency selection circuit that becomes connection in series-parallel to be combined to form in integrated circuit frequency base pin selection connection switch SW 4 and a plurality of capacitance group.

2, portable mobile wireless multi function receiver according to claim 1, its feature in earphone cord as antenna.

3, portable mobile wireless multi function receiver according to claim 1 and 2, its feature are introduced wireless Mike emission in antenna FM signal is sent into electric tuning automatic frequency control frequency modulation monolithic receiving integrate circuit IC1 by the input circuit that earphone socket J1 and inductance L 3, capacitor C 14, C15, C5 form.

4, portable mobile wireless multi function receiver according to claim 1, its feature in switch SW 4 and C19 join select the acoustic frequency range and with C20 Phase Receiver audio section.

5, the audio signal output that portable mobile wireless multi function receiver according to claim 1, its feature demodulate in integrated circuit (IC) 1 promotes the earphone pronunciation through the power amplification circuit that triode BG1 and BG2 constitute.

6, portable mobile wireless multi function receiver according to claim 1, its feature is connected integrated circuit (IC) 1 with scanning switch SW2 shunt capacitance C13 and is constituted by reset switch SW3 and capacitor C 9 integrated circuit (IC) 1 that is connected in parallel in the scanning circuit that resets.

7, portable mobile wireless multi function receiver according to claim 1, its feature connects capacitor C 19, C20 and C8 respectively in three joints of SW4, between 2,3 pin of C20 connection and SW4.