CN204518035U - Automatic control of sound volume audio amplifier - Google Patents
Automatic control of sound volume audio amplifier Download PDFInfo
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- CN204518035U CN204518035U CN201520132088.2U CN201520132088U CN204518035U CN 204518035 U CN204518035 U CN 204518035U CN 201520132088 U CN201520132088 U CN 201520132088U CN 204518035 U CN204518035 U CN 204518035U
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- 230000003321 amplification Effects 0.000 claims abstract description 15
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 15
- 230000007613 environmental effect Effects 0.000 claims abstract description 14
- 230000005236 sound signal Effects 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims description 4
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000001131 transforming effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 206010011903 Deafness traumatic Diseases 0.000 description 1
- 208000002946 Noise-Induced Hearing Loss Diseases 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
Automatic control of sound volume audio amplifier of the present utility model, comprising: audio power amplifier circuit, for carrying out power amplification to audio signal to be played; Loud speaker, for the audio electrical signal that audio reception power amplifier exports; Characterized by further comprising: pick-up, for reception environment noise; Pick-up exports power amplifier, for receiving and amplifying the output signal of pick-up; A/D convertor circuit, for receiving and transforming noise signal; Central processing unit, by calculating the size of environmental noise, the mode be directly proportional to environmental noise according to power amplification gain controls audio power amplifying circuit.Automatic control of sound volume audio amplifier of the present utility model, by obtaining the size of environmental noise, environmentally noise level adjusts the gain of audio power amplifier circuit, make broadcast sound volume large and become large, become lower and diminish with the change of environmental noise, broadcast volume is reached, and electroacoustic is melodious, noise-less pollution, naturally acoustics.
Description
Technical field
The utility model relates to a kind of Automatic control of sound volume audio amplifier, in particular, particularly relate to a kind of broadcast sound volume can with the size of ambient noise be directly proportional change Automatic control of sound volume audio amplifier.
Background technology
The acoustic energy sent due to natural sound source is very limited, its sound pressure level decays with the increase of propagation distance, add the impact of ambient noise, the propagation distance of sound source is restricted, therefore Public Address system is widely used in public activity place, sound-source signal amplifies by it, improve the sound pressure level of audience area, ensure that every audience can obtain suitable sound pressure level, but problem also can be following, current public broadcasting generally adopts constant strength of sound source, suitable sound pressure is adjusted in noisy environment, acoustic trauma can be brought again in quiet environment, otherwise, under quiet environment, comfortable sound pressure can cannot not hear broadcasted content when environmental change is noisy environment again.For this problem, those skilled in the art develops Automatic control of sound volume audio amplifier, environmentally can automatically regulate audio amplifier sound size by noise by Automatic control of sound volume audio amplifier, thus reach that electroacoustic is melodious, noise-less pollution, naturally acoustics.
Summary of the invention
The utility model for current Public Address system can not along with the change of environmental noise automatically change broadcast volume defect, provide a kind of can for providing better by hearer, more comfortable melodious Automatic control of sound volume audio amplifier.
Automatic control of sound volume audio amplifier of the present utility model, comprising:
Audio power amplifier circuit, for carrying out power amplification to audio signal to be played, and exports the signal after amplifying;
Loud speaker, is connected with the output of audio power amplifier circuit, for the audio electrical signal that audio reception power amplifier exports, and is converted into voice signal and plays;
Its special feature is, also comprises:
Pick-up, for reception environment noise, and is translated into signal of telecommunication output;
Pick-up exports power amplifier, and input is connected with the output of pick-up, for receiving the output signal of pick-up, and amplifies rear output to it;
A/D convertor circuit, the output exporting power amplifier with pick-up is connected, and exports the analog signal that power amplifier exports, and be translated into digital signal and export for receiving pick-up;
Central processing unit, input is connected with the output of A/D convertor circuit, and output is connected with the gain control end of audio power amplifier circuit; Central processing unit is by gathering the output signal of A/D convertor circuit, calculate the size of environmental noise, the mode be directly proportional to environmental noise according to power amplification gain controls audio power amplifying circuit, to export the voice signal with environmental noise Adaptive change, reach and make by the comfortable melodious effect of hearer.
Automatic control of sound volume audio amplifier of the present utility model, the cascaded operational amplifying circuit that described audio power amplifier circuit is made up of multiple amplifier unit and audio frequency power amplifier chip form; The input of cascaded operational amplifying circuit is connected with audio signal to be played, and output is connected with the input of audio power chip, and the output of audio frequency power amplifier chip is connected with loud speaker; Be provided with the digital regulation resistance regulating gain in cascaded operational amplifying circuit, the control end of digital regulation resistance is connected with the output of central processing unit.
Automatic control of sound volume audio amplifier of the present utility model, described cascaded operational amplifying circuit is made up of operational amplifier chip LM348N, and the chip that digital regulation resistance adopts is AD5263, and central processing unit is controlled chip AD5263 by spi bus.
Automatic control of sound volume audio amplifier of the present utility model, it is the one-level operational amplification circuit that operational amplifier chip LM348N forms that described pick-up exports power amplifier, the described input of one-level operational amplification circuit is connected with the output of pick-up, and output is connected with the input of A/D convertor circuit.
The beneficial effects of the utility model are: Automatic control of sound volume audio amplifier of the present utility model, central processing unit obtains the size of environmental noise by pick-up, and the gain of audio power amplifier circuit is adjusted according to the noise level obtained, broadcast sound volume is made to become large greatly with the change of environmental noise, become lower and diminish, ensure that and under the environment of noise variation, all can hear broadcast sounds by hearer, reach that electroacoustic is melodious, noise-less pollution, naturally acoustics, beneficial effect is remarkable, is convenient to application.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of Automatic control of sound volume audio amplifier of the present utility model;
Fig. 2 is the circuit diagram of the utility model sound intermediate frequency power amplifier;
Fig. 3 is the circuit diagram that in the utility model, pick-up exports power amplifier;
Fig. 4 is the module frame chart of central processing unit of the present utility model.
In figure: 1 pick-up, 2 pick-ups export power amplifier, 3 A/D convertor circuits, 4 central processing units, 5 audio power amplifier circuits, 6 loud speakers.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
As shown in Figure 1, give the schematic diagram of Automatic control of sound volume audio amplifier of the present utility model, it is made up of audio power amplifier circuit 5, loud speaker 6, pick-up 1, pick-up output power amplifier 2, AD conversion circuit 3, central processing unit 4, the input of audio power amplifier circuit 5 is connected with sound source input, output is connected with the input of loud speaker 6, amplifies for audio signal sound source inputted.The amplification audio electrical signal that audio power amplifier circuit 5 exports by loud speaker 6 is converted into voice signal, plays.
Central processing unit 4 has the effect that signals collecting, data operation and control export, pick-up 1 is for gathering the noise signal in external environment, and inputed to the input that pick-up exports power amplifier 2, pick-up exports power amplifier 2 and inputs in A/D convertor circuit 3 by the noise signal after amplification, man made noise signal after amplification is converted into digital signal by A/D convertor circuit 3, central processing unit 4, by the acquisition and processing of the noise digital signal to input, can judge the size of noise signal.Central operation treatment circuit 4, according to the size of noise signal, adjusts the power amplification gain of audio power amplifier circuit 5, to make the volume of loud speaker 6 become large greatly along with the change of ambient noise, diminish and diminish, makes to hear comfortable melodious broadcast by hearer.
As shown in Figure 2, give the circuit diagram of the utility model sound intermediate frequency power amplifier, audio power amplifier circuit 5 adopts operational amplifier chip LM348N, its inside is 4 amplifier unit, 4 amplifier unit (are respectively LM348N_1, LM348N_2, LM348N_3, LM348N_4) cascaded operational amplifying circuit is constituted, sound source input (IN end) for input audio signal can for microphone input or linearly input, sound source input is connected with the input of first amplifier unit LM348_1, amplify through 4 amplifier unit successively, output signal is inputed to audio frequency power amplifier chip TAD2030 by afterbody amplifier unit (LM348N_4), after the further process of audio frequency power amplifier chip TAD2030, speech play is carried out in output valve loud speaker 6.
The gain resistor of third level amplifier unit adopts digital regulation resistance AD5263, the control end of digital regulation resistance AD5263 is connected with central processing unit through spi bus, central processing unit is according to the noise level calculated, resistance size in digital regulation resistance AD5263 place in circuit is controlled, realize the adjustment to whole audio power amplifier circuit 5 gain size, to make the broadcast voice signal that audio frequency power amplifier output volume is comfortable, loud speaker 6 sends comfortable melodious broadcast sounds.
As shown in Figure 3, give pick-up in the utility model and export the circuit diagram of power amplifier 2, it adopts the one-level amplifier unit of operational amplifier chip LM348N to realize, and the signal after amplification sends into AD converter.The audio signal gathering 1 output due to pick-up is fainter, so could be identified by A/D convertor circuit 3 after must being amplified by amplifying circuit.
As shown in Figure 4, give the module frame chart of central processing unit 4 in the utility model, central processing unit 4 is nucleus modules of native system, single-chip microcomputer PIC33FJ128GP804 is adopted to carry out algorithm process, and utilize spi bus to control digital regulation resistance AD5263, AD5263 receives digital signal that single-chip microcomputer transmits and adjusts the resistance of associated tap end, thus changes the output gain of audio power amplifier circuit.
This programme just adds pick-up and central operation process interlock circuit on common sound-box device, judges, so design and manufacture cost is not high yet to ambient noise.
Claims (4)
1. an Automatic control of sound volume audio amplifier, comprising:
Audio power amplifier circuit (1), for carrying out power amplification to audio signal to be played, and exports the signal after amplifying;
Loud speaker (6), is connected with the output of audio power amplifier circuit, for the audio electrical signal that audio reception power amplifier exports, and is converted into voice signal and plays;
It is characterized in that, also comprise:
Pick-up (1), for reception environment noise, and is translated into signal of telecommunication output;
Pick-up exports power amplifier (2), and input is connected with the output of pick-up, for receiving the output signal of pick-up, and amplifies rear output to it;
A/D convertor circuit (3), the output exporting power amplifier with pick-up is connected, and exports the analog signal that power amplifier exports, and be translated into digital signal and export for receiving pick-up;
Central processing unit (4), input is connected with the output of A/D convertor circuit, and output is connected with the gain control end of audio power amplifier circuit; Central processing unit is by gathering the output signal of A/D convertor circuit, calculate the size of environmental noise, the mode be directly proportional to environmental noise according to power amplification gain controls audio power amplifying circuit, to export the voice signal with environmental noise Adaptive change, reach and make by the comfortable melodious effect of hearer.
2. Automatic control of sound volume audio amplifier according to claim 1, is characterized in that: the cascaded operational amplifying circuit that described audio power amplifier circuit (5) is made up of multiple amplifier unit and audio frequency power amplifier chip form; The input of cascaded operational amplifying circuit is connected with audio signal to be played, and output is connected with the input of audio power chip, and the output of audio frequency power amplifier chip is connected with loud speaker; Be provided with the digital regulation resistance regulating gain in cascaded operational amplifying circuit, the control end of digital regulation resistance is connected with the output of central processing unit.
3. Automatic control of sound volume audio amplifier according to claim 2, it is characterized in that: described cascaded operational amplifying circuit is made up of operational amplifier chip LM348N, the chip that digital regulation resistance adopts is AD5263, and central processing unit is controlled chip AD5263 by spi bus.
4. Automatic control of sound volume audio amplifier according to claim 1 and 2, it is characterized in that: it is the one-level operational amplification circuit that operational amplifier chip LM348N forms that described pick-up exports power amplifier, the described input of one-level operational amplification circuit is connected with the output of pick-up, and output is connected with the input of A/D convertor circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520132088.2U CN204518035U (en) | 2015-03-09 | 2015-03-09 | Automatic control of sound volume audio amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520132088.2U CN204518035U (en) | 2015-03-09 | 2015-03-09 | Automatic control of sound volume audio amplifier |
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| CN204518035U true CN204518035U (en) | 2015-07-29 |
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| CN201520132088.2U Expired - Fee Related CN204518035U (en) | 2015-03-09 | 2015-03-09 | Automatic control of sound volume audio amplifier |
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| CN (1) | CN204518035U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105704555A (en) * | 2016-03-21 | 2016-06-22 | 中国农业大学 | Fuzzy-control-based sound adaptation method and apparatus, and audio-video playing system |
| CN105723739A (en) * | 2016-01-23 | 2016-06-29 | 张阳 | Soundbox device volume adjusting method and system |
| CN106210977A (en) * | 2016-07-15 | 2016-12-07 | 柳州国淘科技有限公司 | A kind of public place is automatically adjusted device and the control method of broadcast volume |
| CN107046662A (en) * | 2017-06-20 | 2017-08-15 | 北京贝能达信息技术股份有限公司 | Track traffic broadcast multi-channel noise detection volume controller and control method |
| CN107071649A (en) * | 2017-06-20 | 2017-08-18 | 北京贝能达信息技术股份有限公司 | Multi-channel noise detection controller and control method with network interface |
| CN107276550A (en) * | 2017-06-20 | 2017-10-20 | 北京贝能达信息技术股份有限公司 | The power amplifier and control method controlled with noise measuring and volume |
| CN110072174A (en) * | 2019-05-21 | 2019-07-30 | 北京京海鸣电子技术研究所 | Volume adaptive identifying machine |
| CN110446146A (en) * | 2019-08-07 | 2019-11-12 | 常州科先达通讯技术有限公司 | Smart speakers |
| CN115148221A (en) * | 2022-06-23 | 2022-10-04 | 中国第一汽车股份有限公司 | Sound control method and control device for pulse heating of power battery |
-
2015
- 2015-03-09 CN CN201520132088.2U patent/CN204518035U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105723739A (en) * | 2016-01-23 | 2016-06-29 | 张阳 | Soundbox device volume adjusting method and system |
| WO2017124445A1 (en) * | 2016-01-23 | 2017-07-27 | 张阳 | Volume adjustment method and system for sound box device |
| CN105704555A (en) * | 2016-03-21 | 2016-06-22 | 中国农业大学 | Fuzzy-control-based sound adaptation method and apparatus, and audio-video playing system |
| CN106210977A (en) * | 2016-07-15 | 2016-12-07 | 柳州国淘科技有限公司 | A kind of public place is automatically adjusted device and the control method of broadcast volume |
| CN107046662A (en) * | 2017-06-20 | 2017-08-15 | 北京贝能达信息技术股份有限公司 | Track traffic broadcast multi-channel noise detection volume controller and control method |
| CN107071649A (en) * | 2017-06-20 | 2017-08-18 | 北京贝能达信息技术股份有限公司 | Multi-channel noise detection controller and control method with network interface |
| CN107276550A (en) * | 2017-06-20 | 2017-10-20 | 北京贝能达信息技术股份有限公司 | The power amplifier and control method controlled with noise measuring and volume |
| CN110072174A (en) * | 2019-05-21 | 2019-07-30 | 北京京海鸣电子技术研究所 | Volume adaptive identifying machine |
| CN110072174B (en) * | 2019-05-21 | 2021-01-29 | 北京京海鸣电子技术研究所 | Volume self-adaptive player |
| CN110446146A (en) * | 2019-08-07 | 2019-11-12 | 常州科先达通讯技术有限公司 | Smart speakers |
| CN115148221A (en) * | 2022-06-23 | 2022-10-04 | 中国第一汽车股份有限公司 | Sound control method and control device for pulse heating of power battery |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150729 |
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| CF01 | Termination of patent right due to non-payment of annual fee |