CN106210977A - A kind of public place is automatically adjusted device and the control method of broadcast volume - Google Patents

Abstract

The invention discloses a kind of public place and be automatically adjusted device and the control method of broadcast volume, specifically include that noise measuring circuit, broadcast decision circuitry, A/D interface and cpu control circuit, described noise measuring circuit is for being converted to noise level by the noise signal detected, whether described broadcast decision circuitry is in broadcast state for judge public place, described A/D interface for the different resistance of switching are accessed speaker loop, controls volume from cpu control circuit；Such that it is able to overcome public place in prior art due to noise reason, to cause losing important broadcast message, or make in order to avoid dropout broadcast sounds be in max volume, to defects such as human body cause damage all the time.

Description

A kind of public place is automatically adjusted device and the control method of broadcast volume

Technical field

The present invention relates to noise detection technique field, in particular it relates to a kind of public place is automatically adjusted broadcast volume Device and control method.

Background technology

Noise can bring to people physiologically mainly following several respects with psychological harm: a. hearing damage b. noise Infringement vision c. homininoxious cardiovascular d. affects the nervous system of people, makes people's irritability, the impact sleep of irritability e., causes Tired.Therefore the monitoring of Noise upon Environment with control the healthy and physically and mentally healthy aspect of people is being had important effect, Strengthening seems to the Detection & Controling of environmental noise is even more important.

Along with sensor technology, microelectric technique, the development of singlechip technology, for intelligence noise TT&C system observing and controlling function Perfect, the raising of Measure Precision and the enhancing etc. of capacity of resisting disturbance provide condition.Simultaneously because single-chip microcomputer has integrated level High, function is strong, volume is little, price is low, capacity of resisting disturbance etc. is better than the advantage of general CPU, therefore, is requiring relatively high control precision With in the industry measurement and control system of lower cost, single-chip microcomputer is often used to replace analog controller as digitial controller.China's ring The technology of border noise automatic continuous monitoring system requires to have received people's national standard, State Environmental Protection Administration and national quality supervision inspection Test quarantine general bureau and promulgate " standard for acoustic environmental quality and the measuring method " of amendment in year, measuring instrument increases environment noise Automatic monitor for continuously instrument, and to comply with relevant regulations.It is raw that Danish company has been installed in the big cities such as Beijing, Shanghai, Guangzhou the most The environment noise continuous and automatic monitoring system produced.Domestic environment noise continues automatic monitoring system existing procucts.

The noise monitoring instrument major part of environmental monitoring department of China all uses the integration system with single-chip microcomputer process function at present Meter sound meter, belongs to portable instrument, and these sound meter sensitivity change with air pressure, humiture, affect certainty of measurement, needs Often to calibrate, the critical component microphone of sound meter and complete machine can not the most long-term round-the-clock work, and need to take shelter from rain Snow, moist, dust storm, otherwise the certainty of measurement of sound meter is decreased obviously, and measurement error can even quit work very greatly.

AT STATION, it is mounted on Public Address system in harbour, the saloon environment such as airport, is mainly used in broadcasting class The information such as secondary, notice.But the noise in hall is the random combination of various different frequency and intensity sound, situation is multiple Miscellaneous changeable, hall broadcast all can be interfered by brouhaha, the startup of locomotive, the big intensity noise such as enter the station such as passenger, and leads Cause passenger and do not hear broadcast message.If holding big broadcast volume for a long time, dysacusis can be caused.If manually carried out in real time Volume adjusting is the most unrealistic.Generally, broadcast speech signal is to be interrupted, and the most how many background noises is continuous print； And acoustical signal has wider frequency band, but energy is concentrated mainly on 800 below Hz.

During realizing the present invention, inventor find prior art at least exists public place due to noise former Cause, causes losing important broadcast message, or makes in order to avoid dropout broadcast sounds be in max volume all the time, right The defects such as human body causes damage.

Summary of the invention

It is an object of the invention to, for the problems referred to above, propose a kind of public place and be automatically adjusted the device of broadcast volume And control method, to overcome in public places due to noise reason, cause losing important broadcast message, or in order to avoid losing Break one's promise breath and make broadcast sounds be in max volume all the time, to defects such as human body cause damage.

For achieving the above object, the technical solution used in the present invention is: a kind of public place is automatically adjusted broadcast volume Device and control method, specifically include that noise measuring circuit, broadcast decision circuitry, A/D interface and cpu control circuit, described in make an uproar Tone detection circuit is for being converted to noise level by the noise signal detected, described broadcast decision circuitry is used for judging public field Whether be in broadcast state, described A/D interface returns for the different resistance of switching are accessed speaker from cpu control circuit Road, controls volume.

Further, described noise measuring circuit includes, MIC Acquisition Circuit, amplifying circuit, half-wave rectifying circuit, filtering Circuit, after specially noise sound wave is converted to voltage signal by electric capacity electret capacitance non-directive MIC, enters the first amplifier NE5532 carries out signal amplification, and amplifier uses 12 V DC sources, coordinates regulation resistance to change gain amplifier, makes linear amplification After AC signal between-6～+6 V, the signal after amplification through half-wave rectifying circuit detection 0～+6 V straight Signal pulse stream, obtains the direct current fluctuation level of relative smooth after removing higher hamonic wave in conjunction with electric capacity, RC time constant is arranged It is 0. 1 s, reflects the direct current average voltage of noise signal faster, it is ensured that the real-time of noise measuring, simultaneously 0～+6 The DC voltage of V will cover the A/ D transition region of 0～+5 V of ADC0809.

Further, described broadcasting decision circuitry includes, amplifies amplitude limiter circuit, the second half-wave rectifying circuit and filtered electrical Road, specifically, the audio signal that broadcast mouth takes out, first passes around the second amplifier NE5532 and amplifies amplitude limit, then whole by half-wave Stream filter circuit, completes the direct current conversion to broadcast signal, and LM393 constitutes two-value decision circuit, and regulation resistance determines upset electricity Flat, when the anodic potentials of LM393 is higher than negative pole current potential, LM393 exports high level, on the contrary output low level；When broadcast is straight Stream signal exports high level more than LM393 during decision threshold, i.e. thinks and is the most broadcasting, when broadcast direct current signal is in this threshold During value, LM393 output low level is thought and is not the most broadcast, and notice CPU gathers level of noise.

Further, described A/D interface and cpu control circuit specifically, use ADC0809,74LS02 and ADC0809 provides gate logic；The AL E pin of AT89S52 provides clock signal for ADC0809, it is contemplated that an only road Noise simulation signal demand is changed, and is changed by the signal of the 3 of ADC0809 address wire ground connection, i.e. selector channel 0；Change-over knot Fruit delivers to the P0 mouth of AT89S52, and the output of LM393 accesses the P3. 2 mouthfuls, CPU of AT89S52 and sentences by inquiring about this port The disconnected A/ D that whether can start changes, and the P1. 5 of AT89S52, P1. 6 port are used for exporting control signal, control relay The break-make of device and then the different resistance of switching access speaker loop.

Further, it is automatically adjusted the control method of the device of broadcast volume based on public place, comprise the following steps:

A. device initializes；

B. ambient noise is sampled；

C. according to power convert resistance；

D. determine whether that bigger noise occurs, if had, convert resistance at once, and proceed to judge, without more Big noise occurs, the time of delay adjustments, continues to judge and sample.

Various embodiments of the present invention, owing to specifically including that noise measuring circuit, broadcast decision circuitry, A/D interface and CPU Control circuit, described noise measuring circuit for being converted to noise level by the noise signal detected, described broadcast judges electricity Road is for judging the broadcast state that whether is in of public place, and described A/D interface is used for different by switch from cpu control circuit Resistance accesses speaker loop, controls volume；Such that it is able to overcome public place in prior art due to noise reason, to cause losing The broadcast message that weightlessness is wanted, or make broadcast sounds be in max volume all the time in order to avoid dropout, human body is caused The defects such as infringement.

Other features and advantages of the present invention will illustrate in the following description, and, partly become from description Obtain it is clear that or understand by implementing the present invention.

Below by embodiment, technical scheme is described in further detail.

Detailed description of the invention

Hereinafter the preferred embodiments of the present invention are illustrated, it will be appreciated that preferred embodiment described herein is only used In the description and interpretation present invention, it is not intended to limit the present invention.

Specifically, a kind of public place is automatically adjusted device and the control method of broadcast volume, specifically includes that noise measuring Circuit, broadcast decision circuitry, A/D interface and cpu control circuit, described noise measuring circuit is for the noise signal that will detect Being converted to noise level, described broadcast decision circuitry is for judging the broadcast state that whether is in of public place, described A/D interface From cpu control circuit for the different resistance of switching are accessed speaker loop, control volume.

Described noise measuring circuit includes, MIC Acquisition Circuit, amplifying circuit, half-wave rectifying circuit, filter circuit, specifically After noise sound wave being converted to voltage signal for electric capacity electret capacitance non-directive MIC, enter the first amplifier NE5532 and carry out signal Amplifying, amplifier uses 12 V DC sources, coordinates regulation resistance to change gain amplifier, make the AC signal after linear amplification- Between 6～+6 V, the signal after amplification detects the DC pulse signal of 0～+6 V through half-wave rectifying circuit, in conjunction with Electric capacity obtains the direct current fluctuation level of relative smooth after removing higher hamonic wave, RC time constant is set to 0. 1 s, the most instead Mirroring the direct current average voltage of noise signal, it is ensured that the real-time of noise measuring, the DC voltage of 0～+6 V will cover simultaneously The A/ D transition region of the 0 of ADC0809～+5 V.

Described broadcasting decision circuitry includes, amplification amplitude limiter circuit, the second half-wave rectifying circuit and filter circuit, specifically, The audio signal that broadcast mouth takes out, first passes around the second amplifier NE5532 and amplifies amplitude limit, then by halfwave rectifier filtered electrical Road, completes the direct current conversion to broadcast signal, and LM393 constitutes two-value decision circuit, and regulation resistance determines trigging signal, when When the anodic potentials of LM393 is higher than negative pole current potential, LM393 exports high level, on the contrary output low level；When broadcast direct current signal Export high level more than LM393 during decision threshold, i.e. think and the most broadcasting, when the direct current signal that broadcasts is in this threshold value LM393 output low level is i.e. thought and is not the most broadcast, and notice CPU gathers level of noise.

Described A/D interface and cpu control circuit are specifically, use ADC0809,74LS02 and ADC0809 to provide choosing Logical logic；The AL E pin of AT89S52 provides clock signal for ADC0809, it is contemplated that only one road noise simulation signal needs Change, the signal of the 3 of ADC0809 address wire ground connection, i.e. selector channel 0 is changed；Transformation result delivers to AT89S52 P0 mouth, LM393 output access AT89S52 P3. 2 mouthfuls, CPU judge whether to start by inquiring about this port A/ D changes, and the P1. 5 of AT89S52, P1. 6 port are used for exporting control signal, controls the break-make of relay and then cuts Change different resistance and access speaker loop.

The control method of the device of broadcast volume it is automatically adjusted based on public place, comprise the following steps:

A. device initializes；

B. ambient noise is sampled；

C. according to power convert resistance；

D. determine whether that bigger noise occurs, if had, convert resistance at once, and proceed to judge, without more Big noise occurs, the time of delay adjustments, continues to judge and sample.

System uses AT89S51 single-chip microcomputer as control core.After noise signal in hall is gathered by MIC, Jing Guofang Greatly, halfwave rectifier, filtering become DC pulse moving voltage signal, then form digital noise level by A/ D conversion and be stored in AT89S52 is in case calculating.Take from the broadcast signal of hall broadcast power amplifier output through amplifying after amplitude limit, rectifying and wave-filtering, then with set Definite value carries out two value ratio relatively, goes out the most whether to be in broadcast gap by multilevel iudge.CPU only starts at broadcast space period A/ D changes, namely only noise, not broadcast in this period hall, thus avoids MIC and is broadcast in hall Also adopt into, it is ensured that accurately distinguishing of two class sources of sound as environmental noise.Nearest 100 noise level values that CPU will collect Calculate, obtain average noise performance number, then control relay, switching according to noise mean power size the most in the same time Different damping resistances is linked into speaker loop, finally realizes the real-time control of volume.

At least can reach following beneficial effect: overcome public place in prior art due to noise reason, to cause losing Important broadcast message, or make broadcast sounds be in max volume all the time in order to avoid dropout, human body is caused damage The defects such as evil.

Finally it is noted that the foregoing is only the preferred embodiments of the present invention, it is not limited to the present invention, Although being described in detail the present invention with reference to previous embodiment, for a person skilled in the art, it still may be used So that the technical scheme described in foregoing embodiments to be modified, or wherein portion of techniques feature is carried out equivalent. All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included in the present invention's Within protection domain.

Claims (5)

1. a public place is automatically adjusted the device broadcasting volume, it is characterised in that include that noise measuring circuit, broadcast judge Circuit, A/D interface and cpu control circuit, described noise measuring circuit for being converted to noise electricity by the noise signal detected Flat, described broadcast decision circuitry is for judging the broadcast state that whether is in of public place, and described A/D interface controls electricity with CPU Road, for the different resistance of switching are accessed speaker loop, controls volume.

Public place the most according to claim 1 is automatically adjusted the device of broadcast volume, it is characterised in that described noise is examined Slowdown monitoring circuit includes, MIC Acquisition Circuit, amplifying circuit, half-wave rectifying circuit, filter circuit, specially electric capacity electret capacitance aphalangia to After noise sound wave is converted to voltage signal by property MIC, entering the first amplifier NE5532 carries out signal amplification, and amplifier uses 12 V DC source, coordinates regulation resistance to change gain amplifier, makes the AC signal after linear amplification between-6～+6 V, put Signal after great is through the DC pulse signal of half-wave rectifying circuit detection 0～+6 V, after removing higher hamonic wave in conjunction with electric capacity Obtaining the direct current fluctuation level of relative smooth, RC time constant is set to 0. 1 s, reflects the straight of noise signal faster Stream average voltage, it is ensured that the real-time of noise measuring, simultaneously the DC voltage of 0～+6 V by cover ADC0809 0～+ The A/ D transition region of 5 V.

Public place the most according to claim 2 is automatically adjusted the device of broadcast volume, it is characterised in that described broadcasting is sentenced Deenergizing includes, amplifies amplitude limiter circuit, the second half-wave rectifying circuit and filter circuit, specifically, the audio frequency that broadcast mouth takes out is believed Number, first pass around the second amplifier NE5532 and amplify amplitude limit, then by halfwave rectifier filter circuit, complete broadcast signal Direct current is changed, and LM393 constitutes two-value decision circuit, and regulation resistance determines trigging signal, when the anodic potentials of LM393 is higher than negative During electrode potential, LM393 exports high level, on the contrary output low level；When the direct current signal that broadcasts is more than decision threshold, LM393 is defeated Going out high level, i.e. think and the most broadcast, when the direct current signal that broadcasts is in this threshold value, LM393 output low level thinks this Time do not broadcast, notice CPU gather level of noise.

Public place the most according to claim 3 is automatically adjusted the device of broadcast volume, it is characterised in that described A/D connects Mouth and cpu control circuit are specifically, use ADC0809,74LS02 and ADC0809 to provide gate logic；AT89S52's AL E pin provides clock signal for ADC0809, it is contemplated that only one road noise simulation signal demand conversion, by ADC0809 3 address wire ground connection, i.e. selector channel 0 signal conversion；Transformation result delivers to the P0 mouth of AT89S52, LM393's Output accesses the P3. 2 mouthfuls, CPU of AT89S52 and judges whether that can start A/ D changes by inquiring about this port, The P1. 5 of AT89S52, P1. 6 port are used for exporting control signal, control break-make and then the different resistance of switching of relay Access speaker loop.

5. a control method for the device of broadcast volume, its feature it is automatically adjusted based on the public place described in claim 4 It is, comprises the following steps:

A. device initializes；

B. ambient noise is sampled；

C. according to power convert resistance；

D. determine whether that bigger noise occurs, if had, convert resistance at once, and proceed to judge, without more Big noise occurs, the time of delay adjustments, continues to judge and sample.