CN103077703A - Method and device for inhibiting dynamic noise - Google Patents
Method and device for inhibiting dynamic noise Download PDFInfo
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- CN103077703A CN103077703A CN2012105729377A CN201210572937A CN103077703A CN 103077703 A CN103077703 A CN 103077703A CN 2012105729377 A CN2012105729377 A CN 2012105729377A CN 201210572937 A CN201210572937 A CN 201210572937A CN 103077703 A CN103077703 A CN 103077703A
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Abstract
The invention provides a method and a device for inhibiting dynamic noise. The method comprises the following steps of: receiving a noise signal; amplifying, compacting, maintaining and sampling the noise signal; carrying out analogue/digital conversion on the noise signal to obtain an eight-bit or sixteen-bit data stream; setting the data stream and transmitting a phase-inverting 180-degree one's complement code or two's complement code; carrying out analogue/digital decoding on the transmitted phase-inverting 180-degree one's complement code or two's complement code; carrying out audio frequency amplifying power output on the decoded one's complement code or two's complement code; and pushing a loudspeaker to sound out inhibiting noise. The device comprises a noise signal acquisition device, a signal processing device, a PCMA/D (Pulse Code Modulation Analogue/Digital) device, an audio frequency cable transmission device, a PCMD/A (Pulse Code Modulation Digital/Analogue) device, an audio frequency amplifying device and a loudspeaker, which are connected in sequence, wherein the signal processing device can be used for amplifying, compacting, maintaining and sampling the noise signal; and the audio frequency cable transmission device is used for setting the data stream to transmit phase-inverting 180-degree one's complement code or two's complement code. The method and the device provided by the invention have the advantages of little influence from wavelength or sound source and better sound control effect.
Description
Technical field
The present invention relates to a kind of inhibition method and apparatus of dynamic noise, be specially adapted to the digitalized audio record of neighbourhood noise inhibition and criminal investigation process.
Background technology
In cities and towns, the peddling sound etc. and can produce a large amount of neighbourhood noises of the tucket of motor vehicle and engine sound, market, in order to guarantee the establishment neighbourhood noise, need to control the dynamic noise of frequency and amplitude random variation, not be subjected to the interference of neighbourhood noise to guarantee the daily normal life of town dweller.
Before this, in order to reduce neighbourhood noise, once adopted a kind of static noise control method, it comprises that absorbing the noise that the noise of generation carries out by the noise absorbing material absorbs, and the noise that is used for stoping generation passes to other zone and the noise shielding adopted, etc.Recently, already developed a kind of dynamic noise control method.According to this dynamic noise control method, be to control the noise that produces with all identical another kind of sound of wavelength (frequency) and amplitude and noise to be controlled.The key concept of dynamic noise control method approximately just became known from 1936, its require when noise occurs, to produce a kind of wavelength (frequency) and amplitude all with all identical sound of the noise of waiting to suppress.
Chinese patent application discloses for No. 93101772.6 a kind of " being used for three-dimensional dynamic noise contro/equipment ", its feature is: the place arranges acoustical generator at the noise source same position, from then on equal identical with noise of the amplitude of the sound wave that gives off of acoustical generator and wavelength, then will make the interference of this two Sonic wave sendings destructive, and be able in three dimensions, suppress noise.But under virtual condition, can not be located at the sound acoustical generator fully and noise source same position place, thereby in three-dimensional Active noise control using, need that a collection of sound acoustical generator is located at noise source contiguous, increase cost.In addition, the noise of this device control effect is subjected to the impact of wavelength or sound source larger.When the long and sound of the wavelength of sound wave hour, just can obtain larger noise and control effect; When shorter or sound source was larger when the wavelength of sound wave, resulting acoustic control effect was just less.
Summary of the invention
The objective of the invention is describedly to need at noise source same position place acoustical generator to be set and is subjected to wavelength or deficiency that the impact of sound source is larger for three-dimensional dynamic noise contro/equipment in order to overcome, and the inhibition method and apparatus of the dynamic noise of a kind of acoustic control better effects if processed is provided.
The inhibition method of dynamic noise provided by the invention may further comprise the steps: receive noise signal; Noise signal is amplified, compresses, kept and takes a sample; Noise signal is carried out analog/digital conversion, obtain 8 or 16 bit data streams; Data stream is arranged, transmit anti-phase 180 ° radix-minus-one complement or complement code; Anti-phase 180 ° radix-minus-one complement or complement code to transmission are carried out the digital-to-analog decoding; Decoded radix-minus-one complement or complement code audio frequency are carried out the output of audio frequency amplifying power, promote the loudspeaker sounding and suppress noise.
The restraining device of dynamic noise provided by the invention, comprise successively the noise signal harvester, the signal processing apparatus that can amplify, compress, keep and take a sample noise signal, PCM(Pulse-code modulation, the i.e. pulse code modulation (PCM) that connect) the A/D device, can arrange and transmit voice-frequency cable transmitting device, PCM D/A device, audio amplification device and the loudspeaker of anti-phase 180 ° radix-minus-one complement or complement code data stream.
Described noise signal harvester can be microphone device or the laser instrument that noise source is picked up.
The present invention does not need at noise source same position place acoustical generator to be set, but to the noise signal that receives directly amplify, compression, maintenance, sampling and digital quantization is processed and negate mutually 180 ° radix-minus-one complement or complement code, then decoding, and the audio frequency of decoded radix-minus-one complement or complement code carried out the output of audio frequency amplifying power, promote the loudspeaker sounding and suppress noise.Thereby the acoustic control effect of this dynamic noise control device is subjected to the impact of wavelength or sound source less, acoustic control better effects if processed.
Description of drawings
Fig. 1 is the structural representation of the restraining device of dynamic noise of the present invention;
Fig. 2 is the configuration diagram of an embodiment of the restraining device of dynamic noise of the present invention;
Fig. 3 is the configuration diagram of another embodiment of the restraining device of dynamic noise of the present invention;
Fig. 4 is PCM A/D schematic diagram;
Fig. 5 is PCM D/A schematic diagram.
1-noise signal harvester, 2-signal processing apparatus, 3-PCM A/D device, 4-voice-frequency cable transmitting device, 5-PCMD/A device, 6-audio amplification device, 7-loudspeaker.
Embodiment
As shown in Figure 1, the restraining device of dynamic noise of the present invention comprises successively the noise signal harvester 1 that connects, the signal processing apparatus 2 that can amplify, compress, keep and take a sample noise signal, PCM A/D device 3, can arrange and transmit voice-frequency cable transmitting device 4, PCM D/A device 5, audio amplification device 6 and the loudspeaker 7 of anti-phase 180 ° radix-minus-one complement or complement code data stream.
Below in conjunction with accompanying drawing the restraining device of dynamic noise of the present invention and the method for utilizing this device to carry out squelch are described further.
Fig. 2 has represented the framework signal in order to the restraining device of the dynamic noise of environmental noise abatement of an embodiment, and this device comprises: a microphone device receives noise signal; One amplification, compression, maintenance, sampler amplify, compress, keep and take a sample noise signal; One PCM A/D device carries out analog/digital (A/D) conversion to noise signal, obtains 8 or 16 bit data streams; One voice-frequency cable transmitting device arranges data stream, transmits anti-phase 180 ° radix-minus-one complement or complement code; One PCM D/A device carries out digital-to-analog (D/A) decoding to anti-phase 180 ° radix-minus-one complement or the complement code of transmission; One audio amplification device carries out the output of audio frequency amplifying power to decoded radix-minus-one complement or complement code audio frequency, promotes the loudspeaker sounding and suppresses noise.
Fig. 3 represented another embodiment in order to the restraining device of the dynamic noise of environmental noise abatement the framework signal, this device comprises: a laser instrument, noise source is picked up; One amplification, compression, maintenance, sampler amplify, compress, keep and take a sample the noise signal that detects; One PCM A/D device carries out analog/digital (A/D) conversion to noise signal, records or transmits anti-phase 180 ° radix-minus-one complement or complement code; One PCM D/A device carries out digital-to-analog (D/A) decoding to anti-phase 180 ° radix-minus-one complement or the complement code of transmission; One audio amplification device carries out the output of audio frequency amplifying power to decoded radix-minus-one complement or complement code audio frequency, promotes the loudspeaker sounding and suppresses noise.
Fig. 4 is PCM A/D schematic diagram, and the signal m (t) from transmitting end obtains pulse amplitude modulation signal (PAM) through sampling, and PAM obtains PCM through quantization encoding,, pattern is changed laggard line number word model and is sent.
Fig. 5 is PCM D/A schematic diagram, passes through successively digital signal reception, regeneration, and the pattern inverse transformation, PAM is rebuild in PCM decoding, (t) arrives receiving end through the signal m ' of low-pass filtering.
In sum, the present invention can obtain radix-minus-one complement or complement code audio frequency according to the dynamic noise signal of frequency and amplitude random variation, and then promotes loudspeaker sounding inhibition noise.
Claims (3)
1. the inhibition method of a dynamic noise is characterized in that, may further comprise the steps: receive noise signal; Noise signal is amplified, compresses, kept and takes a sample; Noise signal is carried out analog/digital conversion, obtain 8 or 16 bit data streams; Data stream is arranged, transmit anti-phase 180 ° radix-minus-one complement or complement code; Anti-phase 180 ° radix-minus-one complement or complement code to transmission are carried out the digital-to-analog decoding; Decoded radix-minus-one complement or complement code audio frequency are carried out the output of audio frequency amplifying power, promote the loudspeaker sounding and suppress noise.
2. the restraining device of a dynamic noise, it is characterized in that, comprise successively the noise signal harvester that connects, the signal processing apparatus that can amplify, compress, keep and take a sample noise signal, PCM A/D device, can arrange and transmit voice-frequency cable transmitting device, PCM D/A device, audio amplification device and the loudspeaker of anti-phase 180 ° radix-minus-one complement or complement code data stream.
3. the restraining device of dynamic noise according to claim 2 is characterized in that, described noise signal harvester is microphone device or laser instrument that noise source is picked up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210572937.7A CN103077703B (en) | 2012-12-25 | 2012-12-25 | Method and device for inhibiting dynamic noise |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210572937.7A CN103077703B (en) | 2012-12-25 | 2012-12-25 | Method and device for inhibiting dynamic noise |
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| CN103077703A true CN103077703A (en) | 2013-05-01 |
| CN103077703B CN103077703B (en) | 2014-12-24 |
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| CN201210572937.7A Expired - Fee Related CN103077703B (en) | 2012-12-25 | 2012-12-25 | Method and device for inhibiting dynamic noise |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017028291A1 (en) * | 2015-08-20 | 2017-02-23 | 韩性峰 | Antiphase-wave muffler |
| CN107071654A (en) * | 2017-05-24 | 2017-08-18 | 歌尔科技有限公司 | A kind of digital noise reduction method, device and a kind of audio-frequence player device |
| CN113783633A (en) * | 2021-09-18 | 2021-12-10 | 广东电网有限责任公司 | Multi-band noise simulation device and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056026A (en) * | 1990-04-21 | 1991-11-06 | 张火荣 | Noise-reducing receiving circuit |
| CN1391688A (en) * | 1999-09-27 | 2003-01-15 | 杰贝尔合作有限责任公司 | Noise suppression system with dual microphone echo cancellation |
| CN1427988A (en) * | 2000-03-07 | 2003-07-02 | 新西兰商史莱柏Dsp公司 | Active nose reduction system |
| CN101853667A (en) * | 2010-05-25 | 2010-10-06 | 无锡中星微电子有限公司 | Voice noise reduction device |
| EP2395774A2 (en) * | 2010-06-10 | 2011-12-14 | Canon Kabushiki Kaisha | Audio signal processing apparatus and method of controlling the same |
-
2012
- 2012-12-25 CN CN201210572937.7A patent/CN103077703B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056026A (en) * | 1990-04-21 | 1991-11-06 | 张火荣 | Noise-reducing receiving circuit |
| CN1391688A (en) * | 1999-09-27 | 2003-01-15 | 杰贝尔合作有限责任公司 | Noise suppression system with dual microphone echo cancellation |
| CN1427988A (en) * | 2000-03-07 | 2003-07-02 | 新西兰商史莱柏Dsp公司 | Active nose reduction system |
| CN101853667A (en) * | 2010-05-25 | 2010-10-06 | 无锡中星微电子有限公司 | Voice noise reduction device |
| EP2395774A2 (en) * | 2010-06-10 | 2011-12-14 | Canon Kabushiki Kaisha | Audio signal processing apparatus and method of controlling the same |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017028291A1 (en) * | 2015-08-20 | 2017-02-23 | 韩性峰 | Antiphase-wave muffler |
| CN107071654A (en) * | 2017-05-24 | 2017-08-18 | 歌尔科技有限公司 | A kind of digital noise reduction method, device and a kind of audio-frequence player device |
| CN113783633A (en) * | 2021-09-18 | 2021-12-10 | 广东电网有限责任公司 | Multi-band noise simulation device and method |
| CN113783633B (en) * | 2021-09-18 | 2023-09-22 | 广东电网有限责任公司 | Simulation device and method for multiband noise |
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| CN103077703B (en) | 2014-12-24 |
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