CN108134976A - A kind of broadcaster of noise-aware and automatic regulating volume - Google Patents
A kind of broadcaster of noise-aware and automatic regulating volume Download PDFInfo
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- CN108134976A CN108134976A CN201711379494.9A CN201711379494A CN108134976A CN 108134976 A CN108134976 A CN 108134976A CN 201711379494 A CN201711379494 A CN 201711379494A CN 108134976 A CN108134976 A CN 108134976A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R27/00—Public address systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2227/00—Details of public address [PA] systems covered by H04R27/00 but not provided for in any of its subgroups
- H04R2227/001—Adaptation of signal processing in PA systems in dependence of presence of noise
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- Acoustics & Sound (AREA)
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- Circuit For Audible Band Transducer (AREA)
Abstract
The broadcaster of a kind of noise-aware and automatic regulating volume, which can voluntarily adjust broadcast sound volume size according to the acoustic pressure size of playing environment noise, so as to promote the signal-to-noise ratio of entire broadcast system.Wherein, noise-aware acoustic pressure size and voluntarily adjust broadcast sound volume size process be to be carried out by some cycles, and the period be can be with self-defining.Meanwhile the snr value in the device be can be preset, and this value can be with self-defining.
Description
Technical field
The present invention relates to public address field, the broadcaster of especially a kind of noise-aware and automatic regulating volume.
Background technology
Indoor sound reinforcement system is one of four classes of sound reinforcement system（Remaining three classes is respectively：Auditorium sound reinforcement system, public broadcasting
System and special conference system）, the application scenarios of indoor sound reinforcement system are also very common：Some class in school, tens
Life is attended class together；In some training organizations, a teacher is against more than ten student " upper small class "；Specialized engineering in one organ
Personnel get together meeting, and traffic issues etc. are discussed.
One problem of indoor sound reinforcement system long-term existence because its application scenarios is different, therefore is difficult unified volume,
The excessive influence user experience of volume, volume is too small and influences whether the correct reception and registration of content, leads to many people " not hearing ".Together
When, since the environment that sound reinforcement system uses is not quite similar, playing environment noise is not of uniform size, if volume is too small, will appear
The too low situation of signal-to-noise ratio, can equally influence user experience, allow user's " can not hear clearly ", influence speech articulation.It is moreover, indoor
Sound reinforcement system is more applied in education sector, and application scenarios are often school, is had for signal-to-noise ratio and speech intelligibility higher
It is required that.
Therefore, design one kind can perceive playing environment noise size, and calculate signal-to-noise ratio, while in signal-to-noise ratio less than pre-
Automatic lifting music broadcast sound volume during first setting value improves the signal-to-noise ratio of broadcast system, also ensures one kind of speech intelligibility
The broadcaster of noise-aware and automatic regulating volume is very necessary.
Closest to the analysis of technology and comparison in the case of existing.
At present, immediate technical solution is in the case of existing：Application No. is CN201310261483.6, Authorization Notice No.
For CN103346848B's《A kind of method and apparatus of noise measuring》（Hereinafter referred " documents 1 "）, application No. is
CN201611133674.4's《Noise detecting method and device》（Hereinafter referred " documents 2 "）.
Documents 1, documents 2 are detected noise, and provide two different noise detecting methods, but
It is that documents 1 and documents 2 have very big difference with the present invention.
Documents 1, application No. is CN201310261483.6, Authorization Notice No. is CN103346848B's《One kind is made an uproar
The method and apparatus of sound detection》, a kind of method and apparatus of noise measuring is described, and realize the accurate detection to noise.
The method of use includes：Noise measuring equipment obtains the power of the subcarrier in orthogonal frequency division multiplex OFDM symbol to be detected
Value determines the mark of the corresponding t easet ofasubcarriers of the subcarrier, and obtains corresponding noise according to the mark of the t easet ofasubcarriers
Detection threshold value when determining that the performance number of the subcarrier meets noise measuring strategy according to the noise measuring threshold value, determines
There are noises for the subcarrier.And detection noise of the present invention and music, and the method detected is only through detection sound pitch（Frequency）
And the sound intensity（Amplitude）As basis for estimation, and the present invention can calculate signal-to-noise ratio, and signal-to-noise ratio and pre-setting can be worth into
Row compares, when less than value is pre-set, it will the amplitude size for meeting and pre-setting music under value state of signal-to-noise is calculated,
And pass through the volume that music volume controller promotes music.
Documents 2, application No. is CN201611133674.4's《Noise detecting method and device》, describe one kind
Target audio signal is just divided into multiple frame signals by noise detecting method and device, this method, the cutoff frequency based on frame signal
Rate determines the subband number for the subband that the frame signal includes and the frequency domain amplitude average value of each subband, determines noise measuring
Coefficient, when noise measuring coefficient is located at predetermined coefficient threshold interval, it is determined that target audio signal is all noise.It is and of the invention
Detection noise and music, and the method detected is only through detection sound pitch（Frequency）And the sound intensity（Amplitude）As basis for estimation,
And the present invention can calculate signal-to-noise ratio, and can be compared signal-to-noise ratio with pre-setting value, when less than value is pre-set,
The amplitude size for meeting and pre-setting music under value state of signal-to-noise will be calculated, and passes through music volume controller and promotes pleasure
The volume of sound.
Invention content
In order to solve the above-mentioned technical problem, the purpose of the present invention is：There is provided one kind can be according to sound reinforcement system playing environment
Noise size and automatically adjust broadcast sound volume, so as to promote and ensure the broadcaster of the signal-to-noise ratio of broadcast system.
The broadcaster of a kind of noise-aware and automatic regulating volume, including noise perception device, music perceptron, sound
Press calculator, music acoustic pressure calculator, signal-to-noise ratio computation device, music volume controller etc..
From the point of view of physics, noise refers to pitch（That is frequency）And loudness of a sound（That is amplitude）Variation is chaotic, sounds and discording
Sound.Musical sound is different from, noise is the sound for being done irregular vibration by sounding body and being generated；From the point of view of physiology, noise
It is should not have and some sound in certain environment.Refer to noisy, ear-piercing sound；From the point of view of telecommunications, interference signal transmission
Energy field, referred to as noise.The generating source of this energy field can come from built-in system, can also result from external environment.
It is every to hamper that people normally rest, the sound of study and work and the sound to be listened to people generate interference
Sound, belong to noise.Noise is the sound that one kind causes that people is irritated or volume is too strong and is detrimental to health.Noise is dirty
Dye is mainly derived from communications and transportation, vehicle whistle, industrial noise, construction, social noise, such as music hall, high-pitched speaker, morning
City and people's speaks up.
The problem of noise is maximum in public address system and sound reinforcement system is to influence whether that the language of transferring content is clear
Clear degree.The importance of speech articulation is self-evident, and the public address system in groups of building, which must have, in case of emergency to be referred to
Lead the ability of crowd's escape direction.These groups of building include airport, railway station, shopping center or music hall etc..Nevertheless,
If since noise is excessive, signal-to-noise ratio is too low, can cause crowd that can not catch the notice of broadcasting, and is unable to escape unharmed, by
This caused consequence may be very miserable.For another example, court, in classroom, in occasions such as hospitals, can hear content will influence
Just, instructional objective reach and medical effect to judicial.
The automatic volume control according to the size of noise promotes signal-to-noise ratio, is that extremely have must so as to promote speech articulation
It wants.Its application scenarios is very wide, in classroom, can promote teaching efficiency, can when being evacuated in public
The security of the lives and property of more people is protected, it is judicial fair and just with that in court, can improve, in hospital, it can improve
Communication efficiency between doctors and patients helps patient quickly to get well.
The people for doing engineering often encounters classroom, government Conference Room, and specification and functional requirement easily reach, but public address
System is not but like that easily by audit, to there is preferable speech articulation, just has to effectively promote signal-to-noise ratio（Reason
In the case of, noise is impossible to completely disappear）.Signal-to-noise ratio is not promoted, that is just without good speech articulation and can
Degree of understanding.
Noise is excessive, it is easy to influence speech articulation.Therefore, signal-to-noise ratio is promoted, speech articulation can be promoted.Noise
Than（S/N ratio）, also referred to as signal to noise ratio refers to transmit the ratio between the mean power of music and the mean power of noise in signal.
The measurement unit of signal-to-noise ratio is dB, and computational methods are that 10lg (Ps/Pn), wherein Ps and Pn represent the flat of music and noise respectively
Equal power.
In broadcast system, it is intended that the signal of transmission is other than music, the thing that should not have any other additional,
That is noise.Therefore, signal-to-noise ratio should the higher the better.In general, signal-to-noise ratio is bigger, and the quality of public address is higher, otherwise on the contrary.
Signal-to-noise ratio generally should not be below 70dB, and efficiently and the signal-to-noise ratio of high quality broadcast system should reach more than 110dB.
Therefore the broadcaster of a kind of noise-aware and automatic regulating volume is designed, installed, is capable of automatic sensing periphery
The size of noise size and automatic regulating volume, so as to which the signal-to-noise ratio for promoting public address system and sound reinforcement system is very necessary
's.
The present invention only need to add in noise perception device, music perceptron, noise acoustic pressure compared with common indoor sound reinforcement system
Calculator, music acoustic pressure calculator, signal-to-noise ratio computation device, music volume controller, user need to only set snr value, other are all
It is full-automatic, cost and time almost without study.Only it is to be understood that the user of signal-to-noise ratio concept can left-hand seat quickly
It grasps, without professional technique background.
Description of the drawings
The broadcaster structure chart of a kind of noise-awares of Fig. 1 and automatic regulating volume.
The broadcaster fundamental diagram of a kind of noise-awares of Fig. 2 and automatic regulating volume.
Label declaration.
100：Noise perception device.
200：Music perceptron.
300：Noise acoustic pressure calculator.
400：Music acoustic pressure calculator.
500：Signal-to-noise ratio computation device.
600：Music volume controller.
Specific embodiment
It is the broadcaster structure chart of a kind of noise-aware and automatic regulating volume such as Fig. 1, noise perception device, music sense
Know that device perceives the noise and music of playing environment respectively, basis for estimation is the frequency characteristic of sound wave, if frequency is random
Judgement for noise, frequency is well-regulated, is judged as music.
The noise perceived and music are respectively sent to noise acoustic pressure calculator and pleasure by noise perception device, music perceptron
In several pressure calculators, pass through the acoustic pressure size of its frequency, magnitude determinations noise and music.
When calculating acoustic pressure, it should be appreciated that the sound intensity（I）And the sound intensity（P）With the relationship of acoustic pressure.The size of the sound intensity and sound wave
Speed, sound wave angular frequency square, amplitude it is square directly proportional.
I=
Wherein, it is density, density=1.29kg/m of air3,
V is the velocity of sound, the velocity of sound=340m/s in air（Under conditions of 1 standard atmospheric pressure and 15 DEG C）,
A is the amplitude of noise or music,
It is angular frequency, it is equal to 2*3.14*f（F is frequency of sound wave）.
The sound intensity（I）With acoustic pressure（P）Relationship be：
I=（P^2）/(ρv)
At this time P be virtual value, if P be amplitude, I=(P^2)/(2 ρ v), wherein amplitude be maximum value, with virtual value for times,
Wherein ρ-Media density, the v- velocities of sound,
With reference to formula above, obtain：
P virtual values=
P amplitudes=
After acoustic pressure is obtained, acoustical power is converted into, calculation formula is：
W=(P^2*S)/(ρc),
In formula, S-sound wave perpendicular through area, unit is：㎡,
The characteristic resistance of ρ c --- medium, unit are Rayleigh, i.e. pa * seconds/rice（Pa*s/m）,
After the power of noise and music is obtained, then substituted into 10lg (Ps/Pn) formula to get to signal-to-noise ratio.
It is the broadcaster fundamental diagram of a kind of noise-aware and automatic regulating volume such as Fig. 2.Signal-to-noise ratio computation device with
It pre-sets value to compare, if it find that less than when pre-setting value, then calculates the pleasure for meeting and pre-setting signal-to-noise ratio music
The amplitude of sound.
Music volume controller when signal-to-noise ratio is less than and pre-sets value, enables snr value be equal to and pre-sets value, then
The amplitude size of music is calculated by signal-to-noise ratio computation device, musical sound volume is promoted, so as to promote signal-to-noise ratio.
In order to dynamically adjust signal-to-noise ratio, the above process is repeated by some cycles, and the period be can be voluntarily
Definition, such as：It 60 seconds, i.e., is proceeded as described above every 60 seconds, when signal-to-noise ratio is found less than value is pre-set,
Music volume controller can then promote musical sound volume.
The snr value of the device is can be pre-set, and can self-defining at any time, such as 70dB, 80dB,
90dB, 100dB, 110dB etc., after which resets, then signal-to-noise ratio computation device and music volume controller also can be adjusted accordingly
Whole and adjusting.
Finally it should be emphasised that, specific embodiment of the present invention be it is illustrative rather than limited, therefore
The present invention includes being not limited to the embodiment described in specific embodiment, every according to the present invention by those skilled in the art
The other embodiment that technical solution obtains, also belongs to the scope of protection of the invention.
Claims (4)
1. the broadcaster of a kind of noise-aware and automatic regulating volume, which is characterized in that the broadcaster can be according to broadcasting
The acoustic pressure size of ambient noise and voluntarily adjust broadcast sound volume size, so as to promote the signal-to-noise ratio of entire broadcast system.
2. the broadcaster of a kind of noise-aware and automatic regulating volume, which is characterized in that the device is by noise perception device, music
Perceptron, noise acoustic pressure calculator, music acoustic pressure calculator, signal-to-noise ratio computation device, music volume controller composition, wherein,
Noise perception device, the main perception for realizing noise, the frequency situation including noise judge noise and musical sound, together with this
When noise-aware amplitude；
Noise perception device, is mainly perceived the amplitude of noise by noise acoustic pressure calculator, switchs to noise by physical computing formula
Acoustic pressure；
Music perceptron, the main perception for realizing music, the frequency situation including music judge music and noise, together with this
When perceive music amplitude；
Music perceptron, is mainly perceived the amplitude of music by music acoustic pressure calculator, switchs to music by physical computing formula
Acoustic pressure；
Signal-to-noise ratio computation device is mainly used for the acoustic pressure of music and noise switching to power, is calculated according to the calculation formula of signal-to-noise ratio
Go out snr value, and when snr value is less than and pre-sets value, the acoustic pressure for meeting and pre-setting signal-to-noise ratio music is calculated
It is worth size and amplitude size；
Music volume controller, when signal-to-noise ratio is less than and pre-sets value, according to the amplitude for the music that signal-to-noise ratio computation device obtains
Size promotes musical sound volume, so as to promote signal-to-noise ratio, makes it equal to pre-set value.
3. a kind of broadcaster of noise-aware and automatic regulating volume, which is characterized in that the above process be by some cycles into
Capable, and the period can be with self-defining.
4. a kind of broadcaster of noise-aware and automatic regulating volume, which is characterized in that snr value is pre-set, and
It and can self-defining at any time.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108632711A (en) * | 2018-06-11 | 2018-10-09 | 广州大学 | Sound reinforcement system gain-adaptive control method |
| CN110855393A (en) * | 2019-11-20 | 2020-02-28 | 广州辉群智能科技有限公司 | Method for controlling broadcast state based on noise information and broadcast system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103686009A (en) * | 2012-09-19 | 2014-03-26 | 海尔集团公司 | Method and device for intelligent perception on television |
| CN105446697A (en) * | 2015-12-31 | 2016-03-30 | 广东小天才科技有限公司 | Automatic earphone volume adjusting method, device and system |
-
2017
- 2017-12-20 CN CN201711379494.9A patent/CN108134976A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103686009A (en) * | 2012-09-19 | 2014-03-26 | 海尔集团公司 | Method and device for intelligent perception on television |
| CN105446697A (en) * | 2015-12-31 | 2016-03-30 | 广东小天才科技有限公司 | Automatic earphone volume adjusting method, device and system |
Non-Patent Citations (1)
| Title |
|---|
| ZHAOTONGLIN: "声波的能量如何计算", 《百度知道》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108632711A (en) * | 2018-06-11 | 2018-10-09 | 广州大学 | Sound reinforcement system gain-adaptive control method |
| CN108632711B (en) * | 2018-06-11 | 2020-09-04 | 广州大学 | Gain self-adaptive control method for sound amplification system |
| CN110855393A (en) * | 2019-11-20 | 2020-02-28 | 广州辉群智能科技有限公司 | Method for controlling broadcast state based on noise information and broadcast system |
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Application publication date: 20180608 |