CN102833650A - AV (Audio/Video) control platform with microphone input module - Google Patents
AV (Audio/Video) control platform with microphone input module Download PDFInfo
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- CN102833650A CN102833650A CN201210342926XA CN201210342926A CN102833650A CN 102833650 A CN102833650 A CN 102833650A CN 201210342926X A CN201210342926X A CN 201210342926XA CN 201210342926 A CN201210342926 A CN 201210342926A CN 102833650 A CN102833650 A CN 102833650A
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Abstract
The invention discloses an AV (Audio/Video) control platform with a microphone input module. The AV control platform with the microphone input comprises a control power supply, a triode group control circuit, a DC (Direct Current) isolating circuit, a voltage limiting diode, an amplifier, a field-effect tube input feedback circuit, a non-inverting amplifier, an AV control platform and a sound channel output, wherein the triode group control circuit is connected with the control power supply, the DC isolating circuit is connected with the triode group control circuit and is connected with the microphone input at the same time, the voltage limiting diode is connected with the DC isolating circuit, the amplifier is connected with the voltage limiting diode, the field-effect tube input feedback circuit is connected with the amplifier, the non-inverting amplifier is connected with the field-effect tube input feedback circuit, the AV control platform is connected with the non-inverting amplifier, and the sound channel output is connected with the non-inverting amplifier. According to the AV control platform with the microphone input, disclosed by the invention, the microphone input module is established on the AV control platform, and the development requirement of locomotive communication command can be accorded.
Description
Technical field
The present invention relates to the Analogical Circuit Technique field, particularly a kind of audio frequency and video controlling platform with the microphone input.
Background technology
In recent years; Domestic and international great Emergent Public Events happens occasionally; Cause serious threat to public safety; People's air defense, fire-fighting, public security, People's Armed Police, forest policeman, earthquake emergency, meteorological civilian special trade such as emergent increase the increasing demand of emergency mobile command communications system, and specification requirement also improves thereupon.Therefore, the emergency mobile traffic guidance system integration and auxiliary product research and development industry thereof have also obtained fast development, so setting up the microphone input module in the audio frequency and video controlling platform is that above each field presses for.
Therefore, need a kind of new technical scheme to address the above problem.
Summary of the invention
To above-mentioned existing in prior technology problem and shortage, the purpose of this invention is to provide a kind of audio frequency and video controlling platform with the microphone input.
For realizing above-mentioned purpose, the audio frequency and video controlling platform of band microphone input of the present invention can adopt following technical scheme:
A kind of audio frequency and video controlling platform with microphone input, comprise control power supply, the triode group control circuit that is connected with the control power supply, is connected and connects simultaneously with triode group control circuit the microphone input dc isolation circuit, connect dc isolation circuit the pressure limiting diode, connect the pressure limiting diode amplifier, connect amplifier FET input feedback circuit, connect that FET is imported the audio frequency and video controlling platform of the in-phase amplifier of feedback circuit, connection in-phase amplifier and the sound channel of connection in-phase amplifier is exported.
The present invention is compared with prior art: the audio frequency and video controlling platform of band microphone input of the present invention, set up the microphone input module in the audio frequency and video controlling platform, and meet motor-driven traffic guidance's demand for development.
Further, said triode group control circuit produces phantom power supplied to microphone input, has solved in the audio frequency and video controlling platform the powerup issue of microphone, and the supply power voltage of 48V especially can be provided microphone.
Description of drawings
Fig. 1 is the structural representation of the audio frequency and video controlling platform of band microphone input of the present invention.
Fig. 2 is the circuit diagram of control power supply in the audio frequency and video controlling platform of band microphone input of the present invention.
Fig. 3 is the circuit diagram of transistor control circuit in the audio frequency and video controlling platform of band microphone input of the present invention.
Fig. 4 is the circuit diagram of microphone in the audio frequency and video controlling platform of band microphone input of the present invention.
Fig. 5 is the circuit diagram after transistor control circuit, dc isolation circuit, pressure limiting diode and dc bias circuit connect in the audio frequency and video controlling platform of band microphone input of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment; Further illustrate the present invention; Should understand following embodiment only be used to the present invention is described and be not used in the restriction scope of the present invention; After having read the present invention, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the present invention.
See also shown in Figure 1; The present invention discloses a kind of audio frequency and video controlling platform with microphone input, comprise control power supply, the triode group control circuit that is connected with the control power supply, is connected and connects simultaneously with triode group control circuit the microphone input dc isolation circuit, connect dc isolation circuit the pressure limiting diode, connect the pressure limiting diode amplifier, connect amplifier FET input feedback circuit, connect that FET is imported the audio frequency and video controlling platform of the in-phase amplifier of feedback circuit, connection in-phase amplifier and the sound channel of connection in-phase amplifier is exported.Said pressure limiting diode is connected with dc bias circuit.
Input produces phantom power supplied said triode group control circuit to microphone.Capacitance microphone generally is made up of electric capacity cartridge and prime amplifier two parts, and the electric capacity cartridge needs a polarizing voltage (electret exception), and prime amplifier also needs electricity consumption.Their required power supplys all carry supply by holding wire, do not throw into question but do not transmit to signal.Such supply power mode is called Phantom Power.
See also shown in Figure 2ly, said control power supply comprises+the 5V level, earth level, jumper terminal and light-emitting diode; Diode is used for the monitor levels height.
See also Fig. 2 and shown in Figure 3, the Q3 base stage connects the control power supply through resistance R 67, and the emitter of Q1 connects the 48V working power.When switch among Fig. 2 connected 2,3, the Q3 base stage was a low level, is in cut-off region, the not conducting of bc interpolar, so the Q1 base stage also is a low level, and the also not conducting of the bc utmost point, current collection is low level very.If switch connects 1,2 among Fig. 2, the D15 conducting is luminous, and the base stage of Q1, Q3 is high level, the bc utmost point conducting of Q1, and current collection is high level very.
See also shown in Figure 4ly, be microphone interface, it is its power supply by the operating voltage that inserts when signal source is provided.
See also shown in Figure 5ly, capacitor C 39, capacitor C 41 intercept phantom power and INA217 input circuit and come.If phantom power is closed, capacitor C 39, capacitor C 41 need to use nonpolar electric capacity.In order to prevent static discharge and hot plug protection, 4 IN4148 diodes are connected in amplifier in.Resistance R 84 provides a path with resistance R 86 for the amplifier input bias current, and input bias current (being generally 100nA) has produced a DC difference input voltage, will produce an output voltage biasing.In this application, this is the main source of output offset voltage normally.The multiplication factor of maximum 1000 times (60dB) is arranged, and amplifier output offset voltage can reach several volts.If output terminals A C is coupling-connected to down firstorder circuit, this is complete acceptable.
In this execution mode, said amplifier is an INA217AIP type amplifier.This amplifier is the amplifier of a kind of low noise, low distortion.Current feedback circuit allows it to reach the frequency domain of broadness and the dynamic response of the brilliance in very big gain ranging.This amplifier can be used for low level audio signal, for example balance Low ESR microphone ideally.Many industry, apparatus, field of medicaments also have benefited from its low noise and wide frequency domain.Unique distortion cancellation circuitry reduces to the utmost point low level with distortion, even be also to be like this in high-gain.For the signal source of 200 Ω, INA217 provides the noise performance of intimate theory.The INA217 characteristics are differential input, low noise, low distortion, in professional amplifier of microphone is used, high-end performance are provided.The INA217 characteristics are that also broad supply district, remarkable output voltage swing, High Output Current drive, and all make it become the optimal candidate's device of high-end audio stratum.INA217 can use and the same DIP-8 of SSM2017 and encapsulation of SOL-16 expanded letter and pin, littler encapsulation, can be referring to the SO-14 of INA163 narrow type.INA217 can be-40 ℃ to+85 ℃ work down.
The invention has the advantages that:
1. low noise, low distortion, wide power supply, wide frequency domain amplifying signal;
2. circuit is simple, and cost is lower;
3. the break-make of controlled phantom power, and with level control, reliability is high conveniently is connected the formation Digital Control with computer;
4. the holding wire power line unites two into one, and is easy to operate;
5. the chip operation conditional request is low, strong interference immunity.
Claims (5)
1. audio frequency and video controlling platform with microphone input is characterized in that: comprise control power supply, the triode group control circuit that is connected with the control power supply, is connected and connects simultaneously with triode group control circuit the microphone input dc isolation circuit, connect dc isolation circuit the pressure limiting diode, connect the pressure limiting diode amplifier, connect amplifier FET input feedback circuit, connect that FET is imported the audio frequency and video controlling platform of the in-phase amplifier of feedback circuit, connection in-phase amplifier and the sound channel of connection in-phase amplifier is exported.
2. the audio frequency and video controlling platform of band microphone input as claimed in claim 1 is characterized in that: input produces phantom power supplied said triode group control circuit to microphone.
3. according to claim 1 or claim 2 the audio frequency and video controlling platform of band microphone input, it is characterized in that: said pressure limiting diode is connected with dc bias circuit.
4. according to claim 1 or claim 2 the audio frequency and video controlling platform of band microphone input, it is characterized in that: said control power supply comprises+the 5V level, earth level, jumper terminal and light-emitting diode; Diode is used for the monitor levels height.
5. according to claim 1 or claim 2 the audio frequency and video controlling platform of band microphone input, it is characterized in that: said amplifier is an INA217AIP type amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210342926XA CN102833650A (en) | 2012-09-14 | 2012-09-14 | AV (Audio/Video) control platform with microphone input module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210342926XA CN102833650A (en) | 2012-09-14 | 2012-09-14 | AV (Audio/Video) control platform with microphone input module |
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| CN102833650A true CN102833650A (en) | 2012-12-19 |
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| CN201210342926XA Pending CN102833650A (en) | 2012-09-14 | 2012-09-14 | AV (Audio/Video) control platform with microphone input module |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104464787A (en) * | 2014-11-27 | 2015-03-25 | 天津天地伟业数码科技有限公司 | Circuit and method for controlling audio acquisition of embedded court trail all-in-one machine |
| CN105142068A (en) * | 2015-07-29 | 2015-12-09 | 合肥赛为智能有限公司 | Microphone howling suppression circuit in intercom system |
| CN108632690A (en) * | 2017-07-18 | 2018-10-09 | 北京视联动力国际信息技术有限公司 | A kind of hand microphone and Gooseneck type microphone switching method and apparatus |
| CN108810740A (en) * | 2018-06-08 | 2018-11-13 | 出门问问信息科技有限公司 | The transmitting device and electronic equipment of audio signal |
| CN110583026A (en) * | 2017-02-16 | 2019-12-17 | 罗伯特·博世有限公司 | Microphone system with adjustable frequency-3 dB point and improved speed of set-up with microphone transducer in feedback loop |
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| EP0546571A1 (en) * | 1991-12-12 | 1993-06-16 | Nec Corporation | Amplifier circuit for electret condenser microphone |
| US20100219827A1 (en) * | 2007-05-18 | 2010-09-02 | Los Alamos National Security, Llc | Ultra-low field nuclear magnetic resonance and magnetic resonance imaging to discriminate and identify materials |
| CN101924525A (en) * | 2009-06-11 | 2010-12-22 | 音频专用集成电路公司 | High performance voice frequency amplifying circuit |
| CN201966874U (en) * | 2010-12-24 | 2011-09-07 | 南京莱斯信息技术股份有限公司 | Audio and video exchanging and audio mixed power amplifying device |
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2012
- 2012-09-14 CN CN201210342926XA patent/CN102833650A/en active Pending
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| EP0546571A1 (en) * | 1991-12-12 | 1993-06-16 | Nec Corporation | Amplifier circuit for electret condenser microphone |
| US20100219827A1 (en) * | 2007-05-18 | 2010-09-02 | Los Alamos National Security, Llc | Ultra-low field nuclear magnetic resonance and magnetic resonance imaging to discriminate and identify materials |
| CN101924525A (en) * | 2009-06-11 | 2010-12-22 | 音频专用集成电路公司 | High performance voice frequency amplifying circuit |
| CN201966874U (en) * | 2010-12-24 | 2011-09-07 | 南京莱斯信息技术股份有限公司 | Audio and video exchanging and audio mixed power amplifying device |
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| TEXAS INSTRUMENTS: "Low-Noise, Low-Distortion", 《WWW.TI.COM》, 30 June 2002 (2002-06-30) * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104464787A (en) * | 2014-11-27 | 2015-03-25 | 天津天地伟业数码科技有限公司 | Circuit and method for controlling audio acquisition of embedded court trail all-in-one machine |
| CN105142068A (en) * | 2015-07-29 | 2015-12-09 | 合肥赛为智能有限公司 | Microphone howling suppression circuit in intercom system |
| CN110583026A (en) * | 2017-02-16 | 2019-12-17 | 罗伯特·博世有限公司 | Microphone system with adjustable frequency-3 dB point and improved speed of set-up with microphone transducer in feedback loop |
| CN110583026B (en) * | 2017-02-16 | 2021-11-09 | 罗伯特·博世有限公司 | Microphone system with microphone transducer in feedback loop |
| CN108632690A (en) * | 2017-07-18 | 2018-10-09 | 北京视联动力国际信息技术有限公司 | A kind of hand microphone and Gooseneck type microphone switching method and apparatus |
| CN108810740A (en) * | 2018-06-08 | 2018-11-13 | 出门问问信息科技有限公司 | The transmitting device and electronic equipment of audio signal |
| CN108810740B (en) * | 2018-06-08 | 2021-01-05 | 出门问问信息科技有限公司 | Audio signal transmission device and electronic equipment |
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Application publication date: 20121219 |