CN2411627Y

CN2411627Y - Wire broadcasting front-end device

Info

Publication number: CN2411627Y
Application number: CN 00229541
Authority: CN
Inventors: 王亦兵
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-03-28
Filing date: 2000-03-28
Publication date: 2000-12-20
Anticipated expiration: 2010-03-28

Abstract

The utility model relates to a wire broadcasting front-end device which is characterized in that the front-end device is composed of a signal synthesizer BH and audio frequency modulation circuits T1, T2, T3, Tn in a number at most equal to the number of primary coils, wherein, signal output ends of the audio frequency modulation circuits are respectively connected with a plurality of primary coils LX1, LX2, LX3, LXn in the signal synthesizer BH. The utility model has the advantages of less power consumption, almost no heat, transmission with long distance, low loss and high fidelity, no front signal interruption caused by failures in lines or receiving equipment, digitized multi-path signal transmission in low cost and good program washability.

Description

The wired broadcasting fore device

The utility model relates to a kind of wired broadcasting fore device.

It is that its headend equipment is the high-power audio enlarger that the wired broadcast system that is widely used in hotel, restaurant, office building, megastore and stadiums at present all uses power to transmit, and transmits and adopts line electricity pressure type current system.But the configuration of above-mentioned this wired broadcast system and occupation mode also exist the some shortcomings part significantly: (1) headend equipment heaviness, and cost is higher; (2) work power consumption produces heat greatly and easily, causes the building environment variation; (3) power loss is bigger in the circuit transport process, and the tonequality fidelity is poor; (4) failure rate height often causes the damage or the shutdown of headend equipment because of any point short circuit or unit failure in the circuit; (5) load matched requires complexity, then can cause front end work undesired if any unbalance, even break down; (6) headend equipments can only transmit one road program, also need specially join a pair of special line, and user's program washability is poor; (7) system maintenance, maintenance technology are had relatively high expectations, and cause the maintenance cost height.

As certain star grade hotel cover rooms 400 are arranged, need be equipped with two watts by every guest room sound equipment of standard, add that every road programs such as dining room, hall and corridor need power can satisfy the demand for 1000 watts approximately, open four road programs as need, then need need expend a large amount of electric power and fund input and can satisfy the demand with four 1000 watts of sound amplifiers.

The purpose of this utility model provides a kind of with regard to being to overcome above-mentioned weak point of the prior art and makes things convenient for, realizes at low cost the wired broadcasting fore device that multi-channel program transmits.

The purpose of this utility model can adopt following measure to realize:

Wired broadcasting fore device of the present utility model is by signal synthesizer BH, with and signal output part respectively with signal synthesizer BH in a plurality of primary coil LX1, LX2, LX3, LXn links to each other and its quantity equates with primary coil quantity at the most audio frequency fm modulation circuit T1, T2, T3, Tn form.

Signal synthesizer described in the utility model comprises high frequency magnetic core H, is wound on a plurality of primary coil LX1, LX2, LX3, LXn and a secondary coil LXu composition on the high frequency magnetic core H.

Operation principle of the present utility model is as follows: various signals from signal source are modulated into various modulation frequency signals via the audio frequency fm modulation circuit, the front end that inserts the cable television network of hotel, restaurant, office building, megastore and stadiums again after signal synthesizer is synthetic gets final product, as set up big local cable radio network, can realize the high-quality transmission of farther distance with inserting the local domain cable television network after the composite signal digitlization.

Do not taking charge of use wired broadcasting fore device of the present utility model in the environment, can dispose the reception multiplying arrangement of different qualities according to actual needs, can use the configuration of two watts of rated output powers as common guest room, and better more senior configuration can be used in senior guest room, thereby obtains better acoustics.As in the dining room, zoness of different such as meeting room, foreground or market use wired broadcasting fore device of the present utility model, can receive according to different demands configurations and amplify facilities, to satisfy different broadcast effects.

Wired broadcasting fore device of the present utility model has the following advantages:

1, volume is little, in light weight, cost is low, and its power consumption is few, and almost empty calory produces, 3 watts of the power consumption deficiencies of one road audio frequency fm modulation circuit;

2, owing to be carrier fm signal transmission, so can realize remote, low-loss, high-fidelity transmission;

3, security reliability height, the fault that can not produce because of circuit or receiving equipment causes front end signal to interrupt;

4, can realize that low cost, digitlization multiple signals transmit, the program washability is good, and need not set up special line.

The drawing of accompanying drawing is described as follows:

Fig. 1 is a schematic block circuit diagram of the present utility model.

Fig. 2 is the schematic diagram of the utility model sound intermediate frequency fm modulation circuit.

Fig. 3 is the schematic diagram of signal synthesizer in the utility model.

Fig. 4 is a shape assumption diagram of the present utility model.

The utility model is done with detailed description below with reference to embodiment (accompanying drawing):

As shown in Figure 1, wired broadcasting fore device of the present utility model is by signal synthesizer BH, with and signal output part form with a plurality of primary coils among the signal synthesizer BH link to each other and its quantity equates with primary coil quantity audio frequency fm modulation circuit T1, T2, T3, Tn respectively.Operation principle is that various audio signals from signal source U1, U2, U3, Un are modulated into various modulation frequency signals via audio frequency fm modulation circuit T1, T2, T3, Tn, the input of a plurality of primary coils inserts signal synthesizer in signal synthesizer BH again, and the front end that inserts the cable television network of hotel, restaurant, office building, megastore and stadiums after signal synthesizer BH is synthetic gets final product.

Shown in Fig. 2,3, signal synthesizer of the present utility model comprises high frequency magnetic core H, is wound on a plurality of primary coil LX1, LX2, LX3, LXn and a secondary coil LXu composition on the high frequency magnetic core H; The utility model audio frequency fm modulation circuit T1, T2, T3, C1 is a coupling capacitance among the Tn, R1 is a generator triode G1 base biasing resistor, R2 is a triode G1 emitter resistance, C2 is a shunt capacitance, capacitor C 4, C5 and resistance R 2 are formed feedback branch, the resonant circuit that capacitor C 3 and L1 form is the inductive reactance circuit by examining the work of BZ oscillation principle, G2 is an amplifying triode, resistance R 3, R4 constitutes the base bias circuit of G2, resistance R 6 is a triode G2 collector load resistor, R5 is the emitter resistance of triode G2, C6, C7 is a shunt capacitance, and C8 is a coupling capacitance.When audio signal when coupling capacitance C1 adds to generator triode G1 base stage, the emitter current of generator triode G1 promptly changes with the variation of signal, the gain of generator triode G1 also changes thereupon, the equivalent input capacitance of generator triode G1 is relevant with gain, and the equivalent input capacitance of generator triode G1 is a part that constitutes oscillating circuit, then the frequency of oscillation of generator triode G1 changes with the variation of signal, realize the frequency modulation processing of audio signal, FM signal is coupled to L2 through L1, after amplifying triode G2 is amplified to certain level, insert the primary coil LX1 of signal synthesizer BH through C8, LX2, LX3, LXn, multiple signals mix after inserted in the cable television network by secondary coil LXu through signal synthesizer BH.

Fig. 4 is a shape assumption diagram of the present utility model, by signal synthesizer BH, with and signal output part respectively with signal synthesizer BH in the wired broadcasting fore device formed of a plurality of primary coil LX1, LX2, LX3, LXn links to each other and its quantity equates with primary coil quantity audio frequency fm modulation circuit T1, T2, T3, Tn be installed in the casing shown in Figure 4, machine shell panel is provided with audio signal access port and the output interface of multichannel from signal source U1, U2, U3, Un.

Claims

1, a kind of wired broadcasting fore device, it is characterized in that: described fore device is by signal synthesizer BH, with and signal output part respectively with signal synthesizer BH in a plurality of primary coil LX1, LX2, LX3, LXn links to each other and its quantity equates with primary coil quantity at the most audio frequency fm modulation circuit T1, T2, T3, Tn form.

2, wired broadcasting fore device according to claim 1 is characterized in that: described signal synthesizer comprises high frequency magnetic core H, is wound on a plurality of primary coil LX1, LX2, LX3, LXn and a secondary coil LXu composition on the high frequency magnetic core H.