CN101094040A - Carrier wave feedback circuit for wire broadcasting terminals in amplitude modulation format or frequency modulation format - Google Patents
Carrier wave feedback circuit for wire broadcasting terminals in amplitude modulation format or frequency modulation format Download PDFInfo
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- CN101094040A CN101094040A CN 200610014394 CN200610014394A CN101094040A CN 101094040 A CN101094040 A CN 101094040A CN 200610014394 CN200610014394 CN 200610014394 CN 200610014394 A CN200610014394 A CN 200610014394A CN 101094040 A CN101094040 A CN 101094040A
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Abstract
The characteristic of this invention is that: the carrier of the modulated data or audio signal is transferred backward on the two-line cablecasting circuit. It is received and demodulated by the host to establish communication between terminals and the host. The traditional two-line cable public broadcasting circuit is upgraded to the bi-direction information circuit. Because of the communication channel established between the host and the terminals, it can be compatible with the security devices and share resources. This carrier transferring backward circuit uses the power supplied by the host through broadcast line. The terminal circuit can be nonpolarly connected. All these enhance the reliability and reduce costs, and plus is convenient to construct. It especially can be applied to the public broadcasting system of school, stadium, apartment buildings, subway station, railway station, airports, etc.
Description
Technical field
The invention belongs to wired Public Address system, specifically, it relates to the terminating circuit of two-wire system level pressure public broadcasting.
Background technology
Existing two-wire system public broadcasting line defct is: the wired broadcasting circuit is that one-way transmission power audio signal is to terminal speaker, the audience just listens to the sound that terminal speaker is sent passively when broadcasting, can't make things convenient for or utilize program circuit and announcer to get in touch on one's own initiative, this traditional program circuit is badly in need of Renewal Design.
Summary of the invention.
The carrier wave feedback circuit that the purpose of this invention is to provide a kind of wire broadcasting terminals amplitude-modulation system or frequency modulation system, this carrier wave feedback circuit solves passback data or audio signal between terminal and the main frame, by main frame reception, demodulation, realize the passback of terminal data or audio signal to main frame.
Another object of the present invention is to have set up the passage of passback data, audio signal between main frame and the terminal, can with the security protection hardware compatibility, realize resource-sharing.
A further object of the present invention is the carrier wave feedback circuit of terminal amplitude-modulation system or frequency modulation system, uses the power supply that is transmitted by broadcast wire by main frame, and terminating circuit can nonpolarityly connect, and has promptly improved reliability and has reduced cost again and be convenient to very much site operation.
The present invention is achieved through the following technical solutions: see accompanying drawing 1,2, it comprises terminal audio frequency signal bandpass filter (1), terminal low pass filter (2), carrier signal amplifier (3), crystal oscillator (4), signal amplifier (5), it is characterized in that: audio signal band pass filter (1) takes out audio signal from rated power broadcast wire, audio signal band pass filter (1) is connected with low pass filter (2), take out DC power supply from rated power broadcast wire, crystal oscillator (4) produces oscillator signal, deliver to carrier signal amplifier (3) and amplify, and carry out amplitude modulation(PAM) or crystal oscillator (4) is carried out frequency modulation(FM) by the output of signal amplifier (5) by the output of signal amplifier (5); Rated power broadcast wire is delivered in the output of carrier signal amplifier (3).
Audio signal band pass filter (1) comprises audio frequency line transformer T1, loud speaker S1; Low pass filter (2) comprises block capacitor C1, bridge rectifier B1, filtering capacitor C2; Carrier signal amplifier (3) comprises capacitor C7, resistor R 10, transistor Q2, capacitor C8, transformer T2, inductor T3, resonant capacitor C9; Crystal oscillator (4) comprises resistor R 6, resistor R 7, resistor R 8, crystal X1, variable capacitance diode D1, capacitor C5, capacitor C6, resistor R 9, transistor Q1; Signal amplifier (5) comprises microphone M1, resistor R 5, gate circuit U2, capacitor C3, capacitor C4, resistor R 1, resistor R 2, resistor R 3, resistor R 4, amplifier U1, K switch 1; Its circuit connecting relation is that rated power broadcast wire one end just links to each other with resonant capacitor C9 left end utmost point upper end with audio frequency line transformer T1; Capacitor C9 right-hand member links to each other with the left end of inductor T3; T2 ultra-Right end of the right-hand member of inductor T3 and transformer links to each other; T2 ultra-Left end of an end, transformer that the rated power broadcast wire other end, capacitor C1 right-hand member, bridge rectifier B1 exchange input links to each other simultaneously; The other end that bridge rectifier B1 exchanges input just links to each other with capacitor C1 left end utmost point lower end with audio frequency line transformer T1; 1 pin of bridge rectifier B1 positive output end, resistor R 1 upper end, capacitor C2 lower end, amplifier U1 positive power source terminal, K switch 1, resistor R 8 upper ends, transistor Q1 collector electrode link to each other simultaneously; Bridge rectifier B1 negative terminal, capacitor C2 upper end, microphone M1 lower end, resistor R 2 lower ends, amplifier U1 negative power end, resistor R 5 lower ends, resistor R 7 lower ends, variable capacitance diode D1 anode, capacitor C6 lower end, resistor R 9 lower ends, resistor R 10 lower ends, transistor Q2 emitter link to each other simultaneously; Microphone M1 upper end links to each other with capacitor C3 left end; Capacitor C3 right-hand member, resistor R 1 lower end, resistor R 2 upper ends and amplifier U1 positive input terminal link to each other simultaneously; The input of gate circuit U2 links to each other with resistor R 5 upper ends; The output of gate circuit U2 links to each other with capacitor C4 left end; Capacitor C4 right-hand member links to each other with resistor R 4 left ends; Amplifier U1 negative input end links to each other with resistor R 4 right-hand members with resistor R 3 left ends; Amplifier U1 output links to each other with 4 pin of resistor R 3 right-hand members and K switch 1; 2 pin of K switch 1 link to each other with resistor R 6 upper ends with 6 pin of K switch 1; 3 pin of K switch 1,5 pin of K switch 1, capacitor C8 left end, transformer T2 just ultra-Left end link to each other simultaneously; Resistor R 6 lower ends, resistor R 7 upper ends, crystal X1 lower end and variable capacitance diode D1 negative terminal link to each other simultaneously; Resistor R 8 lower ends, crystal X1 upper end, capacitor C5 upper end, transistor Q1 base stage link to each other simultaneously; Capacitor C5 lower end, capacitor C6 upper end, resistor R 9 upper ends, capacitor C7 left end, transistor Q1 emitter link to each other simultaneously; Capacitor C7 right-hand member links to each other with transistor Q2 base stage with resistor R 10 upper ends; Transistor Q2 collector electrode links to each other with the first ultra-Right end of transformer T2 with capacitor C8 right-hand member.
Input data or audio signal that signal amplifier (5) amplifies, through K1 4, pin 5 pin carry out amplitude modulation(PAM) to carrier signal amplifier (3), power supply is connected to resistor R 6 through 1 pin, 3 pin of K1, and resistor R 6 and resistor R 7 dividing potential drops provide bias voltage for variable capacitance diode D1.
After K1 switches, input data or audio signal that signal amplifier (5) amplifies, 4 pin, 6 pin, resistor R 6 through K1 add to variable capacitance diode D1 negative pole, finish the frequency modulation(FM) of crystal oscillator (4), power supply is connected to transformer T2 ultra-Left end just through 1 pin, 3 pin of K1 simultaneously, gives carrier signal amplifier (3) power supply.
Described input data are the binary digital signals by outputs such as microprocessor, coding circuits, deliver to amplifier U1 negative input end through gate circuit U2, capacitor C4, resistor R 4, audio signal is meant by the signal of microphone M1 output, delivers to amplifier U1 positive input terminal through capacitor C3.
The carrier wave feedback circuit of described terminal amplitude-modulation system or frequency modulation system adopts low power dissipation design, in a two-wire system Public Address system, can connect a plurality of to hundreds of terminal parts and loud speaker.
Advantage good effect of the present invention: the passage of having set up a passback audio signal between (one) terminal and the main frame, make two-wire system public broadcasting circuit upgrade to the bidirectional transfer of information system, realize the two-way intercommunication conversation between terminal and the main frame by the unidirectional information transmission system; (2) owing to set up the passage of passback data or audio signal between main frame and the terminal, can with the security protection hardware compatibility, realize resource-sharing; (3) carrier wave feedback circuit of terminal uses the power supply that is transmitted by broadcast wire by main frame, and terminating circuit can nonpolarityly connect, and has promptly improved reliability and has reduced cost again and be convenient to very much construction.
Description of drawings
Accompanying drawing (1) is the carrier wave feedback circuit block diagram of wire broadcasting terminals amplitude-modulation system or frequency modulation system; Wherein: the 1st, terminal audio frequency signal bandpass filter, the 2nd, terminal low pass filter, the 3rd, carrier signal amplifier, the 4th, crystal oscillator, the 5th, signal amplifier.
Accompanying drawing (2) is the carrier wave feedback circuit electrical schematic diagram of wire broadcasting terminals amplitude-modulation system or frequency modulation system.
Preferred forms
In order to implement the carrier wave feedback of wire broadcasting terminals amplitude-modulation system or frequency modulation system, 1 or 2 be described further in conjunction with the accompanying drawings, (1) terminal audio frequency signal bandpass filter (1), terminal low pass filter (2), carrier signal amplifier (3), crystal oscillator (4), signal amplifier (5), audio signal band pass filter (1) takes out audio signal from rated power broadcast wire, and audio signal band pass filter (1) is connected with low pass filter (2), take out DC power supply from rated power broadcast wire, crystal oscillator (4) produces oscillator signal, deliver to carrier signal amplifier (3) and amplify, and carry out amplitude modulation(PAM) or crystal oscillator (4) is carried out frequency modulation(FM) by the output of signal amplifier (5) by the output of signal amplifier (5); Rated power broadcast wire is delivered in the output of carrier signal amplifier (3), finishes the passback of MCW modulated carrier wave.(2) goodbye accompanying drawing 2, and audio signal band pass filter (1) comprises audio frequency line transformer T1, loud speaker S1; Low pass filter (2) comprises block capacitor C1, bridge rectifier B1, filtering capacitor C2; Carrier signal amplifier (3) comprises capacitor C7, resistor R 10, transistor Q2, capacitor C8, transformer T2, inductor T3, resonant capacitor C9; Crystal oscillator (4) comprises resistor R 6, resistor R 7, resistor R 8, crystal X1, variable capacitance diode D1, capacitor C5, capacitor C6, resistor R 9, transistor Q1; Signal amplifier (5) comprises microphone M1, resistor R 5, gate circuit U2, capacitor C3, capacitor C4, resistor R 1, resistor R 2, resistor R 3, resistor R 4, amplifier U1, K switch 1; Its circuit connecting relation is that rated power broadcast wire one end just links to each other with resonant capacitor C9 left end utmost point upper end with audio frequency line transformer T1; Capacitor C9 right-hand member links to each other with the left end of inductor T3; T2 ultra-Right end of the right-hand member of inductor T3 and transformer links to each other; T2 ultra-Left end of an end, transformer that the rated power broadcast wire other end, capacitor C1 right-hand member, bridge rectifier B1 exchange input links to each other simultaneously; The other end that bridge rectifier B1 exchanges input just links to each other with capacitor C1 left end utmost point lower end with audio frequency line transformer T1; 1 pin of bridge rectifier B1 positive output end, resistor R 1 upper end, capacitor C2 lower end, amplifier U1 positive power source terminal, K switch 1, resistor R 8 upper ends, transistor Q1 collector electrode link to each other simultaneously; Bridge rectifier B1 negative terminal, capacitor C2 upper end, microphone M1 lower end, resistor R 2 lower ends, amplifier U1 negative power end, resistor R 5 lower ends, resistor R 7 lower ends, variable capacitance diode D1 anode, capacitor C6 lower end, resistor R 9 lower ends, resistor R 10 lower ends, transistor Q2 emitter link to each other simultaneously; Microphone M1 upper end links to each other with capacitor C3 left end; Capacitor C3 right-hand member, resistor R 1 lower end, resistor R 2 upper ends and amplifier U1 positive input terminal link to each other simultaneously; The input of gate circuit U2 links to each other with resistor R 5 upper ends; The output of gate circuit U2 links to each other with capacitor C4 left end; Capacitor C4 right-hand member links to each other with resistor R 4 left ends; Amplifier U1 negative input end links to each other with resistor R 4 right-hand members with resistor R 3 left ends; Amplifier U1 output links to each other with 4 pin of resistor R 3 right-hand members and K switch 1; 2 pin of K switch 1 link to each other with resistor R 6 upper ends with 6 pin of K switch 1; 3 pin of K switch 1,5 pin of K switch 1, capacitor C8 left end, transformer T2 just ultra-Left end link to each other simultaneously; Resistor R 6 lower ends, resistor R 7 upper ends, crystal X1 lower end and variable capacitance diode D1 negative terminal link to each other simultaneously; Resistor R 8 lower ends, crystal X1 upper end, capacitor C5 upper end, transistor Q1 base stage link to each other simultaneously; Capacitor C5 lower end, capacitor C6 upper end, resistor R 9 upper ends, capacitor C7 left end, transistor Q1 emitter link to each other simultaneously; Capacitor C7 right-hand member links to each other with transistor Q2 base stage with resistor R 10 upper ends; Transistor Q2 collector electrode links to each other with the first ultra-Right end of transformer T2 with capacitor C8 right-hand member.(3) the input data or the audio signal of signal amplifier (5) amplification, through K1 4, pin 5 pin carry out amplitude modulation(PAM) to carrier signal amplifier (3), power supply is connected to resistor R 6 through 1 pin, 3 pin of K1, and resistor R 6 and resistor R 7 dividing potential drops provide bias voltage for variable capacitance diode D1; After K1 switches, input data or audio signal that signal amplifier (5) amplifies, 4 pin, 6 pin, resistor R 6 through K1 add to variable capacitance diode D1 negative pole, finish the frequency modulation(FM) of crystal oscillator (4), power supply is connected to transformer T2 ultra-Left end just through 1 pin, 3 pin of K1 simultaneously, gives carrier signal amplifier (3) power supply.(4) carrier wave feedback circuit of described terminal amplitude-modulation system or frequency modulation system when omitting K switch 1, can use amplitude-modulation system separately or use frequency modulation system separately.(5) the input data are the binary digital signals by microprocessor, coding circuit or interlock circuit output, deliver to amplifier U1 negative input end through gate circuit U2, capacitor C4, resistor R 4, audio signal is meant by the signal of microphone M1 output, delivers to amplifier U1 positive input terminal through capacitor C3.(6) carrier wave feedback circuit of described terminal amplitude-modulation system or frequency modulation system adopts low power dissipation design, in a two-wire system Public Address system, can connect a plurality of to hundreds of terminal parts and loud speaker.(7) carrier frequency of carrier signal should be below 36V by the supply voltage that main frame transmits by broadcast wire below 500KHz.
In addition in the above-described embodiment, the present invention is a situation about being applied in wired public broadcasting circuit.But the present invention is not limited to this situation, and for example the present invention can also be widely used in wired public broadcasting circuit on the removable main body (such as train, boats and ships) or further be applied to domestic background musical equipment etc.
Claims (2)
1. the carrier wave feedback circuit of wire broadcasting terminals amplitude-modulation system or frequency modulation system, comprise terminal audio frequency signal bandpass filter (1), terminal low pass filter (2), carrier signal amplifier (3), crystal oscillator (4), signal amplifier (5), it is characterized in that: audio signal band pass filter (1) takes out audio signal from rated power broadcast wire, audio signal band pass filter (1) is connected with low pass filter (2), take out DC power supply from rated power broadcast wire, crystal oscillator (4) produces oscillator signal, deliver to carrier signal amplifier (3) and amplify, and carry out amplitude modulation(PAM) or crystal oscillator (4) is carried out frequency modulation(FM) by the output of signal amplifier (5) by the output of signal amplifier (5); Rated power broadcast wire is delivered in the output of carrier signal amplifier (3).
2. according to claims 1 described carrier wave feedback circuit, it is characterized in that: audio signal band pass filter (1) comprises audio frequency line transformer T1, loud speaker S1; Low pass filter (2) comprises block capacitor C1, bridge rectifier B1, filtering capacitor C2; Carrier signal amplifier (3) comprises capacitor C7, resistor R 10, transistor Q2, capacitor C8, transformer T2, inductor T3, resonant capacitor C9; Crystal oscillator (4) comprises resistor R 6, resistor R 7, resistor R 8, crystal X1, variable capacitance diode D1, capacitor C5, capacitor C6, resistor R 9, transistor Q1; Signal amplifier (5) comprises microphone M1, resistor R 5, gate circuit U2, capacitor C3, capacitor C4, resistor R 1, resistor R 2, resistor R 3, resistor R 4, amplifier U1, K switch 1; Its circuit connecting relation is that rated power broadcast wire one end just links to each other with resonant capacitor C9 left end utmost point upper end with audio frequency line transformer T1; Capacitor C9 right-hand member links to each other with the left end of inductor T3; T2 ultra-Right end of the right-hand member of inductor T3 and transformer links to each other; T2 ultra-Left end of an end, transformer that the rated power broadcast wire other end, capacitor C1 right-hand member, bridge rectifier B1 exchange input links to each other simultaneously; The other end that bridge rectifier B1 exchanges input just links to each other with capacitor C1 left end utmost point lower end with audio frequency line transformer T1; 1 pin of bridge rectifier B1 positive output end, resistor R 1 upper end, capacitor C2 lower end, amplifier U1 positive power source terminal, K switch 1, resistor R 8 upper ends, transistor Q1 collector electrode link to each other simultaneously; Bridge rectifier B1 negative terminal, capacitor C2 upper end, microphone M1 lower end, resistor R 2 lower ends, amplifier U1 negative power end, resistor R 5 lower ends, resistor R 7 lower ends, variable capacitance diode D1 anode, capacitor C6 lower end, resistor R 9 lower ends, resistor R 10 lower ends, transistor Q2 emitter link to each other simultaneously; Microphone M1 upper end links to each other with capacitor C3 left end; Capacitor C3 right-hand member, resistor R 1 lower end, resistor R 2 upper ends and amplifier U1 positive input terminal link to each other simultaneously; The input of gate circuit U2 links to each other with resistor R 5 upper ends; The output of gate circuit U2 links to each other with capacitor C4 left end; Capacitor C4 right-hand member links to each other with resistor R 4 left ends; Amplifier U1 negative input end links to each other with resistor R 4 right-hand members with resistor R 3 left ends; Amplifier U1 output links to each other with 4 pin of resistor R 3 right-hand members and K switch 1; 2 pin of K switch 1 link to each other with resistor R 6 upper ends with 6 pin of K switch 1; 3 pin of K switch 1,5 pin of K switch 1, capacitor C8 left end, transformer T2 just ultra-Left end link to each other simultaneously; Resistor R 6 lower ends, resistor R 7 upper ends, crystal X1 lower end and variable capacitance diode D1 negative terminal link to each other simultaneously; Resistor R 8 lower ends, crystal X1 upper end, capacitor C5 upper end, transistor Q1 base stage link to each other simultaneously; Capacitor C5 lower end, capacitor C6 upper end, resistor R 9 upper ends, capacitor C7 left end, transistor Q1 emitter link to each other simultaneously; Capacitor C7 right-hand member links to each other with transistor Q2 base stage with resistor R 10 upper ends; Transistor Q2 collector electrode links to each other with the first ultra-Right end of transformer T2 with capacitor C8 right-hand member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100143941A CN101094040B (en) | 2006-06-21 | 2006-06-21 | Carrier wave feedback circuit for wire broadcasting terminals in amplitude modulation format or frequency modulation format |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100143941A CN101094040B (en) | 2006-06-21 | 2006-06-21 | Carrier wave feedback circuit for wire broadcasting terminals in amplitude modulation format or frequency modulation format |
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| Publication Number | Publication Date |
|---|---|
| CN101094040A true CN101094040A (en) | 2007-12-26 |
| CN101094040B CN101094040B (en) | 2011-10-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2006100143941A Expired - Fee Related CN101094040B (en) | 2006-06-21 | 2006-06-21 | Carrier wave feedback circuit for wire broadcasting terminals in amplitude modulation format or frequency modulation format |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071886A (en) * | 2015-08-24 | 2015-11-18 | 苏州华启智能科技有限公司 | Audio bus multiplexing system of vehicle-mounted broadcast system |
| CN105991335A (en) * | 2015-02-25 | 2016-10-05 | 邵未 | Addressable fault isolation system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2513116Y (en) * | 2001-12-14 | 2002-09-25 | 天津市赛泽数字通信技术有限公司 | Location detection system for loud speaker fault |
| CN2562511Y (en) * | 2002-08-02 | 2003-07-23 | 张恩迪 | Bus common broadcast system terminal receiving unit |
-
2006
- 2006-06-21 CN CN2006100143941A patent/CN101094040B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105991335A (en) * | 2015-02-25 | 2016-10-05 | 邵未 | Addressable fault isolation system |
| CN105071886A (en) * | 2015-08-24 | 2015-11-18 | 苏州华启智能科技有限公司 | Audio bus multiplexing system of vehicle-mounted broadcast system |
| CN105071886B (en) * | 2015-08-24 | 2017-12-19 | 苏州华启智能科技有限公司 | A kind of vehicle-mounted broadcasting system audio bus-sharing system |
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| Publication number | Publication date |
|---|---|
| CN101094040B (en) | 2011-10-19 |
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