CN2641927Y - Bus type remote broadcasting unit - Google Patents

Abstract

The utility model relates to a bus-type remote broadcast unit, which includes a local sound source, a constant current transmitter, a command generator, and a command modulator. The bus-type remote broadcast unit provided in the utility model has the advantages that the broadcast unit can be used at any place outside the broadcasting studio by using the public broadcasting system to broadcast, and users can install the unit at a plurality of places through a single unibus connection mode to broadcast. What is more, the utility model can receive various operations, such as broadcasting from multiple points or preferentially broadcasting to the broadcasting system, remote controlling the public broadcasting host computer.

Description

The long-range broadcast of bus-type unit

Technical field

The utility model relates to bus-type public broadcasting system, refers to the long-range broadcast of a kind of bus-type unit especially.

Background technology

Any place of user's an urgent demand at present beyond in the studio utilizes Public Address system to broadcast, and user just may have such demand in a lot of positions, yet existing Public Address system only limits to broadcast on the main frame of studio.

The utility model content

In view of above-mentioned, the utility model provide a kind of can be installed in the optional position by whole broadcast system broadcast, flexible configuration, can hold the long-range broadcast of the bus-type that uses simultaneously many places unit.

The long-range broadcast of bus-type of the present utility model unit is characterized in that: comprise

Local source of sound: produce or the local audio signal A that broadcasts of input, its output of exporting this signal is connected to the input of constant current transmitter;

The constant current transmitter: its input is connected to the output of local source of sound, and its output is connected to bus, output constant current signal C, and this bus is connected to the Public Address system main frame;

Also comprise

The instruction modulator: accept the control command B of input, and be modulated on the carrier wave of certain frequency, the output of its output modulation signal is connected to another input of described constant current transmitter;

Command generator: be used to export control command B, its output is connected to the input of described instruction modulator.

Described local source of sound is meant sound source signal or source of sound interface and the treatment circuit thereof that this unit self produces and handles.

The utlity model has following substantive distinguishing features and advantage:

The long-range broadcast unit matching of bus-type of the present utility model Public Address system main frame, any place beyond can be in the studio utilizes Public Address system to broadcast; A user just can install this unit in a lot of positions, and only gets final product by the unified bus connection, and is simple and reliable for structure, and can hold multiple spot simultaneously to the broadcast system broadcast, perhaps realizes preferential broadcast; Can carry out Remote to the various broadcast operations of main frame.

Description of drawings

Fig. 1 is the long-range broadcast of a utility model bus-type unit electricity theory diagram.

Fig. 2 is the circuit diagram of the typical specific embodiment in the utility model bus-type long-range broadcast unit.

Embodiment

Consult Fig. 1, bus style mainframe for public broadcasting system of the present utility model is made up of local source of sound 1 (as microphone socket and amplifier thereof), command generator 3 (as single-chip microcomputer 89C2051), instruction modulator 4 (as the FSK modulator) and constant current transmitter 2 (as the circuit of being made up of devices such as operational amplifier and triodes).

Various functional circuit module described in Fig. 1 all belong to general and mature technique, and all can adopt multiple scheme to realize.Though the scheme that realizes can be ever-changing, its basic principle is the same:

Produce local broadcast source of sound voltage signal A by local source of sound 1; The control command B that is sent by command generator 3 is modulated at through modulator 4 on the carrier wave of certain frequency and produces modulation signal D, and source of sound voltage signal A and modulation signal D mix and are converted to constant current signal through the constant current transmitter and send on the bus.Here, local source of sound both can be the sound source signal (as the signal that produces by built-in microphone, the tape signal that carries the tape deck broadcast etc.) that this unit self produces and handles, and also can be source of sound interface and treatment circuit thereof.In use, the latter need outer partition from source of sound generator (as microphone, walkman etc.).

The Public Address system main frame is obtained current signal (comprising audio signal and the instruction) back that is sent by suitable mode and is broadcast to whole system on described bus.If there are a plurality of such unit to use simultaneously,,, when broadcast, produce Overlay on bus so these current signals will superpose owing to adopted constant current signal; When perhaps not needing to superpose some position can be temporarily broadcasting signal not; Perhaps reach the purpose of preferential broadcast by instruction mode.By the various operations of instruction on can Long-distance Control public broadcasting main frame.

Fig. 2 is a kind of typical examples of implementation.Structure and principle that it is detailed are as follows:

Send instruction B and control analog switch U8A by command generator single-chip microcomputer U1 (comprising 89C2051 and oscillating element capacitor C 15 thereof, C16, crystal oscillator Z1 etc.); Form the switch terminals that carrier signal generator produces carrier signal E and delivers to analog switch U8A by U9 (comprise 4060 and oscillating element capacitor C 12, C13, resistance R 11, crystal oscillator Z2 etc.), instruct B to modulate to realize FSK, at another switch terminals generation fsk modulated signal D of U8A by the break-make of control analog switch.

Form the microphone signal amplifier by operational amplifier U2A and subsidiary component resistance R 2 thereof, R3, capacitor C 2, to amplify the microphone signal of being imported from microphone socket P1, they promptly form local source of sound.The circuit of forming by operational amplifier U10A, resistance R 12, R13, R14, capacitor C 14, after above-mentioned local sound source signal A and modulation signal D mixing, driving is formed the constant current transmitter by triode T1 and resistance R 1, from the collector electrode output constant current signal of its T1, and delivers on the bus C.The Public Address system main frame is obtained current signal (comprising audio signal and the instruction) back that is sent by suitable mode and is broadcast to whole system on this bus.

Claims (3)

1, the long-range broadcast of bus-type unit is characterized in that: comprise

Local source of sound: produce or the local audio signal A that broadcasts of input, its output of exporting this signal is connected to the input of constant current transmitter;

The constant current transmitter: its input is connected to the output of local source of sound, and its output is connected to bus, output constant current signal C.

2, the long-range broadcast of bus-type according to claim 1 unit is characterized in that: also comprise

The instruction modulator: accept the control command B of input, the output of its output modulation signal is connected to another input of described constant current transmitter.

3, the long-range broadcast of bus-type according to claim 2 unit is characterized in that: also comprise

Command generator: be used to export control command B, its output is connected to the input of described instruction modulator.