CN102833650A - AV (Audio/Video) control platform with microphone input module - Google Patents

AV (Audio/Video) control platform with microphone input module Download PDF

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Publication number
CN102833650A
CN102833650A CN 201210342926 CN201210342926A CN102833650A CN 102833650 A CN102833650 A CN 102833650A CN 201210342926 CN201210342926 CN 201210342926 CN 201210342926 A CN201210342926 A CN 201210342926A CN 102833650 A CN102833650 A CN 102833650A
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connected
amplifier
circuit
audio
microphone
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CN 201210342926
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Chinese (zh)
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鲁荣杰
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南京莱斯信息技术股份有限公司
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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

带麦克风输入的音视频控制平台 With audio and video control platform microphone input

技术领域 FIELD

[0001] 本发明涉及模拟电路技术领域,特别是一种带麦克风输入的音视频控制平台。 [0001] The present invention relates to the field of analog circuit technologies, particularly to a control platform microphone input audio and video tape. 背景技术 Background technique

[0002] 近年来,国内外重大突发公共事件时有发生,给公共安全造成严重威胁,人防、消防、公安、武警、森警、地震应急、气象应急等民用特种行业对应急机动指挥通信系统的需求日益増加,技术要求也随之提高。 [0002] In recent years, when domestic and foreign major public emergencies occur, pose a serious threat, civil defense, fire, police, armed police, forest police, earthquake emergency, emergency weather and other special industries to civilian emergency mobile command and communication system for public safety the growing demand to increase in technical requirements increases. 因此,应急机动通信指挥系统集成及其附属产品研发行业也得到了快速发展,故,在音视频控制平台建立麦克风输入模块是以上各领域所迫切需要的。 Therefore, emergency mobile communications command system integration and its subsidiary R & D industry has also been rapid development, therefore, to establish microphone input module in audio and video control platform is more urgently needed in all areas. [0003] 因此,需要一种新的技术方案以解决上述问题。 [0003] Therefore, a new technical solution to solve the above problems.

发明内容 SUMMARY

[0004] 针对上述现有技术所存在的问题和不足,本发明的目的是提供一种带麦克风输入的首视频控制平台。 [0004] For the above-described prior art problems and shortcomings, the present invention is to provide a microphone input with the first video control platform.

[0005] 为实现上述目的,本发明带麦克风输入的音视频控制平台可采用如下技术方案: [0005] To achieve the above object, the present invention with a microphone in the audio and video control platform may employ the following technical solutions:

[0006] 一种带麦克风输入的音视频控制平台,包括控制电源、与控制电源连接的三极管组控制电路、与三极管组控制电路连接并同时连接麦克风输入的直流隔离电路、连接直流隔离电路的限压ニ极管、连接限压ニ极管的放大器、连接放大器的场效应管输入反馈电路、连接场效应管输入反馈电路的同相放大器、连接同相放大器的音视频控制平台及连接同相放大器的声道输出。 Limit [0006] A tape audio and video control platform microphone input, including power control, the power supply control transistor group connected to the control circuit, a control circuit connected to the transistor group connected to the DC isolation circuit while the microphone input, the isolation circuit connected to the DC pressure ni diode connected FET input feedback circuit voltage limiting ni amplifier diode, connected to an amplifier, is connected with the amplifier FET input of the feedback circuit, connected to audio and video control platform noninverting amplifier and the connection channel noninverting amplifier output.

[0007] 本发明与现有技术相比:本发明带麦克风输入的音视频控制平台,在音视频控制平台建立麦克风输入模块,符合机动通信指挥的发展要求。 [0007] Compared with the prior art: audio and video control platform of the present invention with a microphone input, the microphone input module to establish audio and video control platform in line with the requirements of development in mobile communication command.

[0008] 进ー步的,所述三极管组控制电路对麦克风输入产生幻象电源供电,解决了在音视频控制平台中对麦克风的供电问题,尤其是能够对麦克风提供48V的供电电压。 [0008] The intake ー step, the transistor of the group control circuit generates an input microphone phantom power supply solves the problem of the microphone of the audio and video control platform in particular possible to provide a supply voltage of 48V microphone.

附图说明 BRIEF DESCRIPTION

[0009] 图I为本发明带麦克风输入的音视频控制平台的结构示意图。 [0009] Figure I is a schematic structural microphone input audio and video control platform with the invention.

[0010] 图2为本发明带麦克风输入的音视频控制平台中控制电源的电路示意图。 [0010] FIG 2 with microphone input audio and video control platform in a circuit diagram of the power control of the present invention.

[0011] 图3为本发明带麦克风输入的音视频控制平台中三极管控制电路的电路示意图。 A circuit diagram of a circuit [0011] FIG 3 audio and video control platform of the present invention with a microphone in the control transistor.

[0012] 图4为本发明带麦克风输入的音视频控制平台中麦克风的电路示意图。 [0012] FIG. 4 a circuit diagram of audio and video control platform in the microphone input of the microphone with the present invention.

[0013] 图5为本发明带麦克风输入的音视频控制平台中三极管控制电路、直流隔离电路、限压ニ极管及直流偏置电路连接后的电路示意图。 Audio and video control platform [0013] FIG. 5 of the present invention with a microphone in the control circuit transistor, the DC isolation circuit, a circuit schematic of the diode and the DC bias voltage limiting circuit connected to ni.

具体实施方式 detailed description

[0014] 下面结合附图和具体实施方式,进ー步阐明本发明,应理解下述具体实施方式仅用于说明本发明而不用于限制本发明的范围,在阅读了本发明之后,本领域技术人员对本发明的各种等价形式的修改均落于本申请所附权利要求所限定的范围。 After the drawings and specific embodiments, further illustrate the present invention into ー, to be understood that the embodiments described below merely to illustrate the present invention and are not intended to limit the scope of the invention, the present invention is read in [0014] conjunction with the following, the present art various modifications to the art equivalents of the present invention fall within the present application are defined by the claims appended range.

[0015] 请參阅图I所示,本发明公开ー种带麦克风输入的音视频控制平台,包括控制电源、与控制电源连接的三极管组控制电路、与三极管组控制电路连接并同时连接麦克风输入的直流隔离电路、连接直流隔离电路的限压ニ极管、连接限压ニ极管的放大器、连接放大器的场效应管输入反馈电路、连接场效应管输入反馈电路的同相放大器、连接同相放大器的音视频控制平台及连接同相放大器的声道输出。 [0015] Referring to FIG I, the present invention is disclosed ー species with audio and video control platform microphone input, including power control, the power control group and the transistor connected to the control circuit, a control circuit connected to the transistor group and simultaneously connect the microphone input DC blocking circuit, connected to limit the DC isolation circuit pressure ni diode connected pressure limiting ni amplifier diode, connected to an amplifier FET input feedback circuit connected with the amplifier FET input of the feedback circuit, connected with the inverting amplifier internet connection and control of audio and video channel output of the inverting amplifier. 所述限压ニ极管连接有直流偏置电路。 The voltage limiting diode is connected to ni current bias circuit.

[0016] 所述三极管组控制电路对麦克风输入产生幻象电源供电。 The [0016] The control circuit of the transistor group phantom power generated by the microphone input. 电容麦克风一般由电容极头和预放大器两部分组成,电容极头需要有ー个极化电压(驻极体例外),预放大器也需要用电。 Usually by the capacitance capacitor microphone and the preamplifier poles of two parts, the first capacitor electrode ー need a polarizing voltage (electret exceptions), preamplifier need electricity. 它们所需的电源都由信号线携带供给,但并不给信号传送造成问题。 They need to carry the power supplied by the signal line, but does not cause problems for signal transfer. 这样的供电方式称为幻象供电。 This is called phantom power supply.

[0017] 请參阅图2所示,所述控制电源包括+5V电平,接地电平,跳线端子以及发光二极 [0017] Please refer to FIG. 2, the control power supply comprises a + 5V level, the ground level, light-emitting diode and jumper terminals

管;ニ级管用于监控电平高低。 Tube; ni stage for monitoring the level of the level pipe. · ·

[0018] 请參阅图2及图3所示,Q3基极通过电阻R67接控制电源,Ql的发射极接48Vエ作电源。 [0018] Please refer to FIG. 2 and FIG. 3, Q3 through a resistor R67 connected to the base control power, Ql emitter electrode connected to the power supply 48V for Ester. 当图2中开关连接2、3吋,Q3基极为低电平,处于截止区,be极间不导通,故Ql基极也为低电平,be极亦不导通,集电极为低电平。 When connected to the switch 3 in FIG. 2 inches, Q3 group is very low, in the off-region, the inter-electrode BE is not conducting, the base of Ql is also low, nor conducting electrode BE, the collector is low level. 若图2中开关连接1、2,D15导通发光,Q1、Q3的基极均为高电平,Ql的be极导通,集电极为高电平。 When the switch 2 is connected in FIG. 1,2, D15 conduction emission, Q1, Q3's base are high, Ql, the pole be turned collector is high.

[0019] 请參阅图4所示,为麦克风接ロ,它在提供信号源的同时,由接入的工作电压为其供电。 [0019] Please refer to FIG. 4, a microphone connected to ro, while it provides a signal source, power from an access operating voltage.

[0020] 请參阅图5所示,电容C39、电容C41将幻象电源与INA217输入电路阻隔开来。 [0020] Please refer to FIG. 5, the capacitor C39, the capacitor C41 and INA217 phantom power to the input circuit to open the barrier. 若幻象电源关闭,电容C39、电容C41需使用非极性电容。 If the phantom power is turned off, capacitor C39, capacitor C41 needs a non-polar capacitor. 为了防止静电放电和热插拔保护,4个IN4148 ニ极管连在放大器输入端。 In order to prevent electrostatic discharge protection and a hot-swappable, 4 ni IN4148 diodes connected in the amplifier input. 电阻R84与电阻R86为放大器输入偏置电流提供了一条通路,输入偏置电流(通常为IOOnA),产生了一个DC差值输入电压,将会产生一个输出电压偏置。 Resistor R84 and the resistor R86 to the amplifier input bias current provides a path for the input bias current (typically IOOnA), produces a DC input voltage difference, the output will produce a voltage bias. 在这种应用中,这通常是输出偏置电压的主要来源。 In this application, this is usually a major source of bias voltage output. 有着最大1000倍(60dB)的放大倍数,放大器输出偏置电压可达几伏。 It has the largest 1000 times (60dB) magnification, the amplifier output offset voltage of up to several volts. 如果输出端AC耦合连接到下一阶电路,这是完全可以接受的。 If the AC coupled output terminal is connected to the next stage circuit, which is perfectly acceptable.

[0021] 在本实施方式中,所述放大器为INA217AIP型放大器。 [0021] In the present embodiment, the amplifier is a INA217AIP amplifier. 本放大器是ー种低噪声、低失真的放大器。 This kind of amplifier is ー low noise, low distortion amplifier. 电流反馈电路允许它达到宽广的频域和在很大增益范围内的卓越的动态响应。 Current feedback circuit allows it to achieve a wide frequency domain and a superior dynamic response over a wide range of gain. 本放大器能够理想地用于低层次音频信号,例如平衡低阻抗麦克风。 This amplifier can be used over the low-level audio signal, for example, balanced low impedance microphones. 许多エ业、器械、医药领域也得益于它的低噪声和宽频域。 Many Ester industry, instrument, but also the medical field due to its low noise and wide frequency range. 独特的失真消除电路将失真降低至极低的水平,即使在高増益是也是这样。 Unique distortion cancellation circuitry reduces distortion to very low levels, even in high-zo is beneficial as well. 对于200 Ω的信号源,INA217提供了近乎理论的噪声表现。 For the signal source 200 Ω, INA217 provides a near-noise performance theory. INA217特点在于差动输入、低噪声、低失真,在专业麦克风放大器应用中提供了高端的表现。 INA217 is characterized by a differential input, low noise, low distortion, delivers high-end performance in the professional microphone amplifier applications. INA217特点还在于宽广的供电范围、卓越的输出电压摆动、高输出电流驱动,都使它成为高端音效阶层最理想的候选器件。 INA217 further characterized in that a wide range of power supply, the output voltage swing excellent, high output current drive, make it an ideal candidate for high-end audio class device. INA217可以用与SSM2017同样的DIP-8和S0L-16宽体封装和引脚,更小的封装,可參见INA163的S0-14窄型。 INA217 may be the same SSM2017 DIP-8 and S0L-16 and Wide package pins, smaller packages can be found in the INA163 narrow S0-14. INA217可在-40V至+85°C下工作。 INA217 can work at -40V to + 85 ° C.

[0022] 本发明的优点在于: [0022] The advantage of the present invention:

[0023] I.低噪声、低失真、宽供电、宽频域放大信号; [0023] I. a low noise, low distortion, wide-power, broadband domain amplified signal;

[0024] 2.电路简单,成本较低; [0024] The circuit is simple, low cost;

[0025] 3.可控幻象电源的通断,且以电平控制,可靠性高,方便与计算机连接,形成数字化控制; [0025] 3. controllable phantom power-off, and a level control, high reliability, easy connection to a computer, digital control is formed;

[0026] 4.信号线电源线合ニ为一,操作方便; [0027] 5.芯片工作条件要求低,抗干扰性強。 [0026] 4. The signal line is a power line together ni, easy to operate; Low [0027] The chip working conditions, immunity to interference.

Claims (5)

  1. 1. 一种带麦克风输入的音视频控制平台,其特征在于:包括控制电源、与控制电源连接的三极管组控制电路、与三极管组控制电路连接并同时连接麦克风输入的直流隔离电路、连接直流隔离电路的限压ニ极管、连接限压ニ极管的放大器、连接放大器的场效应管输入反馈电路、连接场效应管输入反馈电路的同相放大器、连接同相放大器的音视频控制平台及连接同相放大器的声道输出。 A microphone input with audio and video control platform, characterized by: a control power supply, the power supply control transistor group connected to the control circuit, a control circuit connected to the transistor group connected to the DC isolation circuit while the microphone input, connected to DC isolation threshold circuit pressure ni diode connected pressure limiting ni amplifier diode, FET input feedback circuit connected to an amplifier, is connected with the amplifier FET input of the feedback circuit, connected to audio and video control platform inverting amplifier and is connected with the amplifier the channel output.
  2. 2.如权利要求I所述的带麦克风输入的音视频控制平台,其特征在于:所述三极管组控制电路对麦克风输入产生幻象电源供电。 2. The audio and video control platform with a microphone of claim I, wherein: said control circuit transistor group of the microphone inputs to generate phantom power.
  3. 3.如权利要求I或2所述的带麦克风输入的音视频控制平台,其特征在于:所述限压ニ极管连接有直流偏置电路。 3. The audio and video control platform of claim I or 2 with a microphone as claimed in claim, wherein: said voltage limiting diode is connected to ni current bias circuit.
  4. 4.如权利要求I或2所述的带麦克风输入的音视频控制平台,其特征在于:所述控制电源包括+5V电平,接地电平,跳线端子以及发光二极管;ニ级管用于监控电平高低。 4. The audio and video control platform of claim I or 2 with a microphone as claimed in claim, wherein: said control includes a + 5V power supply level to ground level, and a light emitting diode jumper terminals; ni stage for monitoring a tube level high and low.
  5. 5.如权利要求I或2所述的带麦克风输入的音视频控制平台,其特征在于:所述放大器为INA217AIP型放大器。 5. The audio and video control platform of claim I or 2 with a microphone as claimed in claim, wherein: said amplifier is a INA217AIP amplifier.
CN 201210342926 2012-09-14 2012-09-14 AV (Audio/Video) control platform with microphone input module CN102833650A (en)

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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

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Cited By (2)

* Cited by examiner, † Cited by third party
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

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