CN1484395A - Bus type long distance broadcasting unit - Google Patents
Bus type long distance broadcasting unit Download PDFInfo
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- CN1484395A CN1484395A CNA021430365A CN02143036A CN1484395A CN 1484395 A CN1484395 A CN 1484395A CN A021430365 A CNA021430365 A CN A021430365A CN 02143036 A CN02143036 A CN 02143036A CN 1484395 A CN1484395 A CN 1484395A
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- broadcast
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- constant current
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Abstract
A bus remote broadcast unit includes a native sound source, a constant current sender, an instruction generator, and an instruction modulator. This invented broadcast unit can broadcast at any place outside the broadcast room by public broadcast systems, users can mount the said unit for broadcast by a single bus connection method at many places, this unit can contain multipoint and broadcast to the broadcast system at the same time or in advance and remote control operations of public broadcast host.
Description
Technical field
The present invention relates to bus-type public broadcasting system, refer 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.
Summary of the invention
In view of above-mentioned, the invention provides 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 invention unit is characterized in that: comprise
Local source of sound: produce or the local audio signal of broadcasting of input, and deliver to the constant current transmitter;
The constant current transmitter: accept the audio signal of this locality broadcast of input, the output constant current signal is to bus, and this bus is connected to the Public Address system main frame;
Also comprise
Command generator: be used to send control command, and give the instruction modulator;
The instruction modulator: accept above-mentioned control command, and be modulated on the carrier wave of certain frequency, the output modulation signal is given described constant current transmitter;
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 present invention has following substantive distinguishing features and advantage:
The long-range broadcast unit matching of bus-type of the present invention 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 bus-type of the present invention unit electricity theory diagram.
Fig. 2 is the circuit diagram of the typical specific embodiment in bus-type of the present invention long-range broadcast unit.
Embodiment
Consult Fig. 1, bus style mainframe for public broadcasting system of the present invention 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 (5)
1, the long-range broadcast of bus-type unit is characterized in that: comprise
Local source of sound: produce or the local audio signal of broadcasting of input, and deliver to the constant current transmitter;
The constant current transmitter: accept the audio signal of this locality broadcast of input, the output constant current signal is to bus, and this bus is connected to the Public Address system main frame.
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 of input, and be modulated on the carrier wave of certain frequency, the output modulation signal is given 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 send control command, and give described instruction modulator.
4, according to claim 2 or 3 described bus style mainframe for public broadcasting system, it is characterized in that: the frequency range of described carrier wave is the above and 1738.4Hz～187443.7Hz of 187557.1Hz.
5, according to claim 2,3 or 4 described bus style mainframe for public broadcasting system, it is characterized in that: the frequency range of described carrier wave is above and 1738.4Hz～15619.7Hz and 15630.9Hz～187443.7Hz of 187557.1Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021430365A CN1484395A (en) | 2002-09-21 | 2002-09-21 | Bus type long distance broadcasting unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021430365A CN1484395A (en) | 2002-09-21 | 2002-09-21 | Bus type long distance broadcasting unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1484395A true CN1484395A (en) | 2004-03-24 |
Family
ID=34148170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021430365A Pending CN1484395A (en) | 2002-09-21 | 2002-09-21 | Bus type long distance broadcasting unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1484395A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102457343A (en) * | 2010-10-29 | 2012-05-16 | 杨林 | Local amplifying device of public broadcast |
| CN104105013A (en) * | 2014-07-10 | 2014-10-15 | 四川兴事发能源科技有限公司 | Multi-party real-time intercom system and data flow thereof |
-
2002
- 2002-09-21 CN CNA021430365A patent/CN1484395A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102457343A (en) * | 2010-10-29 | 2012-05-16 | 杨林 | Local amplifying device of public broadcast |
| CN104105013A (en) * | 2014-07-10 | 2014-10-15 | 四川兴事发能源科技有限公司 | Multi-party real-time intercom system and data flow thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |