CN2338916Y

CN2338916Y - Wall hanging type automatic tuning frequency-modulation loudspeaker

Info

Publication number: CN2338916Y
Application number: CN 98215220
Authority: CN
Inventors: 黄文豪; 佘兆树; 李金水; 林民砚; 佘春霞
Original assignee: Fujian Prov Broadcast & Tv Tech Research Inst
Current assignee: Fujian Prov Broadcast & Tv Tech Research Inst
Priority date: 1998-06-04
Filing date: 1998-06-04
Publication date: 1999-09-15
Anticipated expiration: 2008-06-04

Abstract

The utility model relates to a wall hanging type automatic tuning frequency-modulation loudspeaker. The utility model is a novel frequency-modulation radio receiver which is particularly suitable for the households of wide villages and towns to listen multi-set of frequency-modulation broadcasting programs form cable television networks. The utility model is composed of a machine core of a common automatic program selecting frequency-modulation receiver, a specially arranged pull wire and an input socket return circuit. When the specially arranged pull wire is pulled, the volume size of the broadcasting can be changed. If a key which is arranged at the tail end of the pull wire is pressed, radio stations which are used for receiving different frequencies can be selected. The input socket can be connected with a terminal box of a cable television user.

Description

Wall-hanging automatic channel selection frequency modulation loudspeaker

The utility model is a kind of automatic channel selection FM receiver that is convenient to wall hanging.

The utility model is applicable to that vast rural area, urban households use, and is specially adapted to listen to many cover FM broadcasting programs the cable net altogether from the wired broadcasting TV.

Existing automatic channel selection FM receiver, volume regulate to adopt potentiometer, and search key, the reset key used of channel selection is installed on the cabinet automatically, are applicable to that desktop puts.The luxury automatic channel selection FM receiver of BWM-0530 as the 7th edition introduction of orders January 30 in 1994 " electronics newspaper ".

The purpose of this utility model be to provide a kind of can wall hanging, and volume is easy to adjust, also FM receiver easily of channel selection, with adapt to vast rural area, urban households' wall hanging uses.

The utility model is made up of common automatic channel selection FM reception machine core and special backguy and the signal input socket loop that is provided with.The special backguy that is provided with is a twin-core shielding conductor, fall in the outer below of cabinet, its upper end is linking a hilted broadsword and is throwing pulling switch more, its end is equipped with search key and the reset key that two automatic channel selections of confession are used, the special backguy that is provided with of pulling affects hilted broadsword to throw pulling switch more, can change the volume that receiver is received broadcast program, the search key or the reset key of the special backguy end that is provided with of pressing, selective reception is to the FM radio station of different frequency automatically.The input socket loop is by constituting with input socket and the band pass filter that cable TV subscriber's terminal box links, so that the FM broadcasting program in the reception cable television network.

Fig. 1 is the utility model outside drawing, and except attaching plug, one of cabinet below is a shielding conductor among the figure, and end is equipped with search key and reset key, and input socket FM is equipped with in the cabinet upper left side _{Go into}

Fig. 2 is the wall-hanging automatic channel selection frequency modulation loudspeaker embodiment schematic diagram of the utility model.Now describe in conjunction with Fig. 2:

It in Fig. 2 dashed rectangle the common automatic channel selection FM reception machine core that uses Dutch PHILIPS Co. chip development, this partial circuit principle and each several part device function " radio " the 8th phase the 36th in 1993, introduce all-sidely for 37 pages, only concise and to the point here repetition is as follows:

In the dotted line cabinet is common automatic channel selection FM reception machine core, adopt the TDA7088 integrated circuit, this IC interior comprise mixing, local oscillator, in put, circuit such as noise elimination, AFC, 15 pin have the search trigger function, 16 pin have reset function, use 70KHz Low Medium Frequency and monotropic appearance single tuning technology, form the automatic channel selection FM receiver of monolithic with automatic function of search, mix the TDA7052 integrated circuit of band BTL power amplifier, under 8 Ω loads, can obtain 1 watt of sinusoidal wave power.

Fig. 2 dashed rectangle is outward the special backguy that is provided with of the utility model, it is a twin-core audio frequency shielding conductor, the external shield line links to each other with the 3V power line of movement, and 15 pin of heart yearn B and movement TDA7088 link, the 16 pin binding of another root heart yearn A and movement TDA7088.The other end of twin-core shielding conductor then links to each other with two key switches that are contained in the backguy end respectively, wherein A and search key SB ₁Link B and reset key SB ₂Link.The special backguy upper end that is provided with also links a SP3T pulling switch KD ₁, KD ₁Respectively with C ₂₂, R ₅, R ₁₀, R ₁₁, C ₂₁Link to each other, form the differential declines of audio signal, the pulling backguy, pulling switch is in different three positions, and that the volume of receiver loudspeaker is respectively is large and small, do not have three kinds of states, to reach the purpose of regulating volume.Signal input socket FM _{Go into}, by band pass filter BP ₁Insert movement, BP ₁Adopt the U.S. logical BP78108A band pass filter in Shanghai, BP ₁Can prevent in the cable television network out of band signal to the interference of movement, the reception of the television channel of cable television network is disturbed in the high order harmonic component that also prevents the local oscillation signal of the movement simultaneously input port of scurrying out.

The utility model can connect 6 overhead accumulators according to demand, when having a power failure, and the program of still can listening to the radio programme.

For a long time, China rural area, the traditional wired broadcasting loudspeaker in cities and towns all are wall-hanging, and great advantage of the present utility model is that this wall-hanging with traditional wired loudspeaker are identical, is convenient to obtain vast rural area and the user's of urban households approval.

Claims

A kind of wall-hanging automatic channel selection frequency modulation loudspeaker, it is made up of common automatic channel selection FM reception movement and special backguy and the input socket loop that is provided with, and it is characterized in that:

A. the special backguy that is provided with is a twin-core shielding conductor, falls in the outer below of cabinet.

B. the special backguy upper end that is provided with links the pulling switch that hilted broadsword is thrown more.

C. the special backguy end that is provided with is equipped with search key and the reset key that two automatic channel selections of confession are used.