CN2175996Y

CN2175996Y - Antenna transmit-receive device composed of wirless microphone and pocket receiver

Info

Publication number: CN2175996Y
Application number: CN 93242974
Authority: CN
Inventors: 任颂红
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-10-19
Filing date: 1993-10-19
Publication date: 1994-08-31
Anticipated expiration: 2003-10-19

Abstract

The utility model relates to an antenna transmit-receive device, belonging to the technical field of the wireless frequency modulation, and suitable for the places, such as the family entertainment, the Kara-ok, the meeting sound reinforcement, etc. A wireless microphone adopts the common variety. The operating frequency of a pocket receiver is the same as the operating frequency of the wireless microphone, and the operating frequency is out of the frequency modulation broadcasting waveband (from 87.5 MHZ to 108 MHZ). The box element of the receiver is matched with a signal line (2) with a standard microphone plug, and the signal line (2) is connected in an interface (5). An interface circuit is an impedance transformer network which causes the audio output impedance of the receiver is the standard 600 ohms. The utility model can replace the wired microphone directly to complete the whole processes of the wireless transmitting and the wireless receiving. The utility model has the advantages of small size, less power consumption, and convenient carrying.

Description

Antenna transmit-receive device composed of wirless microphone and pocket receiver

The utility model belongs to the wireless frequency modulation technical field.Be applicable to places such as home entertaining, karaoke, meeting be transaudient.

At present, at family's karaoke, the transaudient place of meeting is widely used is cable microphone, owing to " wired " brings many inconvenience, lead-in wire is short, and moving range is little during use; Lead-in wire is long, causes winding again, impedes, signal is subject to defect such as interference.All be not easy to flexible, frequent the moving of user.Existing all kinds of wireless microphones on the market, though realized wireless transmission signal, but the user must provide FM reception equipment for oneself, and because of its operating frequency all at frequency modulation(FM) broadcast band (among the 87.5MHZ～108MHZ), easily with broadcast singal mutual interference even can't operate as normal mutually.In addition, in present music centers equipment, the selection of various signal sources (as radio reception, tape, CD-audio player etc.) is in interlocking state.When the user used fm band to receive common wireless microphone signal, other signal source just was lockable, and can not use.So, need to carry out with the Karaoke activity that tape, CD-audio player, external video tape recorder have accompaniment to sing.Therefore, common wireless microphone is in the essentially no practical value in places such as family, stage.Present professional stage system has solved the deficiency of the above cable microphone and wireless microphone, is furnished with private radio microphone and corresponding receiver.But cost an arm and a leg, receiver bulky (suitable with a CD-audio player) is not easy to carry.It is premature to spread to family.

The purpose of this utility model is: the tranmitting frequency of wireless microphone is in beyond the frequency modulation(FM) broadcast band, avoids station interference.And be equipped with corresponding pocket receiver.Adopting minitype single-chip FM reception integrated circuit is core.And connect the holding wire of a band standard microphone plug to pocket receiver, by the impedance conversion technology, make this plug holding wire can be directly and cable microphone socket coupling.Whole device is not only finished the wireless transmission of signal process, and directly compatible with the cable microphone using system.

Be to realize the utility model, its technical scheme is: the wireless microphone of described device is identical with the pocket receiver operating frequency, and all is adjusted to frequency modulation(FM) broadcast band (87.5MHZ～108MHZ) in addition.Holding wire (2) and interface (5) have been connected on pocket receiver (1) box body, this holding wire (2) is that a colloid single-core shielding line, screen (I) link to each other with the 12nd pin of monolithic FM reception integrated circuit (IC) 1 by the radio frequency fan-in network in the receiver (1), and by the L3 audio frequency ground connection in the network.Therefore, screen (I) has antenna and ground wire dual-use function concurrently.Heart yearn (II) links to each other with the 23rd pin of IC1 by an impedance transformer network, and this impedance transformer network makes the output impedance of receiver (1) be 600 ohm of standards, and is consistent with cable microphone output impedance.Therefore, received signal can be imported in the cable microphone socket of stereo set by the standard microphone plug on the holding wire (2).Realize direct compatibility with cable microphone.Power supply indicator (4), mains switch (7), frequency trim knob (6) are arranged on receiver (1) box body; Adopt No. 5 powered battery of two joint 1.5V.

Good effect of the present utility model is: this device volume is little, in light weight, thereby is easy to carry.The plug holding wire (2) that connects on the pocket receiver by this device, the cable microphone socket that receiver directly can be inserted stereo set uses, thereby using method is very simple.Again since the distortion factor less than one of percentage, signal to noise ratio was greater than 60 fens shellfishes, so tonequality is good.Effectively use half through greater than ten meters, can be easily in karaoke that family, small-sized dance hall, meeting room carry out and public address, use.

Further specify technology contents of the present utility model below more in conjunction with the accompanying drawings:

Fig. 1 is an overall structure schematic diagram of the present utility model.

Fig. 2 is a pocket receiver schematic diagram of the present utility model.

Fig. 3 is a signal wire interface schematic diagram of the present utility model.

Fig. 4 is a receiver circuit schematic diagram of the present utility model.

See this device of Fig. 1 overall diagram, pocket receiver (1) wear can with the direct compatible holding wire (2) of cable microphone jack. The tranmitting frequency of wireless microphone (3) is at frequency modulation(FM) broadcast band (87.5MHZ～108MHZ) in addition. See power switch (7) is arranged on Fig. 2-3 pocket receiver (1) box body, frequency trim knob (6), power supply indicator (4), interface (5), and holding wire (2), this holding wire be a single-core shielding line, the screen layer of holding wire (I) forms the antenna fan-in networks with capacitor C 9, C10 and inductance L 3 in the interface (5). This network is connected to IC 1(CXA1019M or CXA1191M) the 12nd pin on. The heart yearn of holding wire (II) links to each other with the 23rd pin of IC1 by the impedance transformer network that is made up of triode V1, resistance R 4, R5, R6, R7, capacitor C 14, C13.

Exemplify most preferred embodiment below in conjunction with accompanying drawing:

Wireless microphone (3) emission FM signal, the utility model adopts common wireless microphone, but operating frequency is not in frequency modulation(FM) broadcast band.So omit the wireless microphone circuit theory diagrams at this.Major technique feature of the present utility model is on pocket receiver.Fig. 4 is the pocket receiver circuit diagram.Its core is a monolithic FM reception integrated circuit (IC) 1, and model is CXA1019M or CXA1191M, and this integrated circuit is the flat packaging form, and erection space is little, with and to make receiver be able among miniaturization, the figure each component parameters as follows:

R1＝100Ω， R2＝100KΩ， R3＝2.2KΩ， R4＝220Ω，

R5=100K Ω, R6=1K, R7=560 Ω all adopts the 1/16W fixed carbon resister.

C1=10P, C2=C3=22P, C4=C5=5P, C6, C7 are that doubly-linked can hold electric capacity, capacity is from 3P-20P.

C8＝， C9＝C10＝22P， C11＝0.01μF／10V，C12＝10μF／10V

C13＝1μF／10V，C14＝10μ／10V，C15＝100μF／10V，C16＝0.01μ。

The transistor model is 2SC9014 or 2SC1815, β 〉=250

Power supply adopts No. 5 powered battery of two joint 1.5V.

Claims

1, the wireless transmitter of a kind of wireless microphone and pocket receiver composition, wireless microphone (3) contains moving-coil type miaow head, audio frequency amplification, frequency modulation, radiating portion; Pocket receiver (1) contains radio frequency and amplifies, local oscillator, mixing, intermediate frequency, the frequency discrimination part, it is characterized in that: worn holding wire (2) and interface (5) on the pocket receiver of described device (1) box body, and the holding wire (2) that interface (5) connects is a single-core shielding line, its screen (I) links to each other with the 12nd pin of integrated circuit (IC) 1 by a radio frequency input grid, screen (I) internal core wire (II) links to each other with the 23rd pin of integrated circuit (IC) 1 by an impedance transformer network, it is 600 ohm that impedance transformer network makes receiver audio output impedance, holding wire (2) has radio frequency reception antenna and audio frequency output dual-use function concurrently, (87.5MHZ～108MHZ) in addition, pocket receiver (1) receives corresponding frequencies to the tranmitting frequency of the wireless microphone of described device (3) at frequency modulation(FM) broadcast band.

2, the wireless transmitter of forming by wireless microphone and pocket receiver according to claim 1, it is characterized in that: the screen (I) of described holding wire (2) and capacitor C 9, C10, the radio frequency fan-in network that inductance L 3 is formed is connected, and screen (I) is the ground wire of audio frequency simultaneously, by C9 and IC1(CXA1019M or CXA1191M) the 12nd pin be connected; Heart yearn (II) links to each other with the impedance transformer network that transistor V, resistance R 5, R6, R7, R8, capacitor C 14, C15 form, and this impedance transformer network is connected on the 23rd pin of IC1.

3, according to claim 1 and 2 described devices, it is characterized in that: the other end of the holding wire (2) that the pocket receiver of described device (1) connects is a standard microphone plug, be complementary with the cable microphone socket of stereo set, and will receive by wireless microphone (3) emission, signal input stereo set is finished the wireless transmission process.