CN109088611A - A kind of auto gain control method and device of acoustic communication system - Google Patents
A kind of auto gain control method and device of acoustic communication system Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
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Abstract
The invention discloses the auto gain control methods and device of a kind of acoustic communication system, the acoustic signals of acquisition are filtered by bandpass filter, obtain effective sound wave frequency range, it is then converted into digital signal and carries out the detection and result judgement of acoustic communication data frame to it, when result is judged as acoustic communication data frame, gain adjustment is carried out to current demand signal according to the target amplitude value of setting, compared with tradition carrys out linear gradual processing with the length of voice communication frame, the present invention is handled with the length of acoustic communication data frame, under the premise of signal does not generate distortion spectrum after guarantee processing, it shortens the processing entry-into-force time and improves processing speed, visible and safe gain is formed to signal.In addition, the present invention program is filtered using filter, cuts and select effective acoustic signals, and to being judged as that the signal of non-acoustic communication data frame does not do gain process and directly exports, substantially increase treatment effeciency.
Description
Technical field
The present invention relates to acoustic communication process fields, and in particular to a kind of auto gain control method of acoustic communication system
And device.
Background technique
The propagation of acoustic energy usually with square distance inversely, propagation distance doubles, and energy just decays to
A quarter originally, such as the acoustic energy that acquires outside five meters and the acoustic energy of the acquisition one meter at have been compared poor 25
Times, but noise after long-distance communications, will appear repeatedly there is no because reducing apart from increase in a closed space
Reflection and superposition, form reverberation effect, thus cause signal-to-noise ratio decline very much.Therefore, after microphone acquires signal, it will usually
Enhancing processing is carried out to weak signal using automatic growth control (AGC, Automatic Gain Control).
According to signal type, automatic growth control can be divided into analog gain adjustment and digital gain adjustment two ways,
Analog gain adjustment is main to be realized by hardware circuit, and digital gain adjustment is then realized by software processing.For sound wave number
The automatic growth control (AGC) of word signal, Conventional automatic gain control method are mainly used in call scene, it will usually be used
Two kinds of priori detections: being based on the statistics of periodic signal energy root mean square (RMS, Root Mean Square) and is based on speech activity
Detect the statistics of (VAD, Voice Activity Detection).In order to guarantee the representative value of statistics and avoid unexpected abnormality
Signal, the energy value of the speech sample in the first statistics frame period, then be averaged, then compare the RMS average value of this frame and preset
Upper energy limit threshold value adjusts this frame gain.In order to avoid energy jump, the energy gain adjustment of continuous several frames is generallyd use
The mode of slow linear rise, or be adjusted using recurrence smoothing filter (linear filter), through after a period of time
Buffering variation, be finally raised to upper limit threshold；Statistics based on VAD is also to be carried out as unit of frame, when detecting that voice is living
The frame of jump then adjust gain, the sluggish frame of voice does not adjust then, for the purposes of avoiding energy jump, for the frame of voice activity
Energy adjusting be also linear gradual.The above traditional method is advantageous in that the energy adjusting that can make voice signal not will cause
Energy jump, so that call is made to feel volume smooth, and defect is that all processing are all based on voice communication frame, and
The length of frame cannot be too short, and the processing of linear filter needs convergence time in addition, therefore coming into force for traditional method responds speed
It spends slower.
There are the camp Liang great, Android and IOS for current mobile intelligent terminal, and the fragmentation of Android is than more serious: equipment is various,
Brand is numerous, and hardware version is different, thus brings different terminals in acoustic communication when sending data, there are sound
, there is the problem of equipment compatibility in the larger problem of wave amplitude difference in size.And for the voice signal of non-talk application at
Reason, such as the synchronization in acoustic communication, synchronization frame is inherently shorter, when transmitting terminal volume is smaller, if AGC enhancing is handled
Slowly, it is possible to synchronization frame can be lost, and synchronizing in acoustic communication is the prerequisite for establishing communication, therefore with tradition
Way handles meeting so that reinforcing effect is bad, influences communication efficiency.
Summary of the invention
It is an object of the invention to propose the auto gain control method and device of a kind of acoustic communication system, abandon with language
The converse length of frame of sound carrys out linear gradual processing, but is handled with the length of acoustic communication data frame, improves response processing speed
Degree.
To realize the above goal of the invention, the technical solution adopted is that:
A kind of auto gain control method of acoustic communication system, comprising the following steps:
S1: acquisition acoustic signals will be filtered after acoustic signals amplification by bandpass filter；
S2: filtered acoustic signals are converted into digital signal；
S3: the detection of acoustic communication data frame is carried out to the digital signal and result judges；
S4: when the result is judged as acoustic communication data frame, current demand signal is increased according to the target amplitude value of setting
Benefit adjustment.
Further, the step S3 is specifically included:
S31: the digital signal is sampled by the audio sample rate set；
S32: and then time-frequency domain conversion is carried out to the digital signal of sampling；
S33: the detection of acoustic communication data frame is carried out to the sampled signal after frequency domain conversion again and is judged with result:
S331: the carrier frequency point value of the acoustic communication of predetermined quantity is extracted to the frequency-region signal after conversion first, and is calculated separately
Obtain corresponding range value PKamp；
S332: calculate the cumulative of the carrier frequency point range value PKamp of the predetermined quantity and, by it is described cumulative and with preset
Threshold value be compared, judge whether the digital signal is acoustic communication data frame；If described add up and be greater than or equal to pre-
The threshold value first set, then result is judged as data frame；If described add up and be less than preset threshold value, result is judged as non-
Data frame.
Further, extracting method used by the value of frequency point for extracting predetermined quantity is random extracts or by normal state point
Mode for cloth extracts.
Further, the predetermined quantity is 5 ~ 40.
Further, the target amplitude value is compared by the digital signal parameters of current operation window frame and previous operation window frame
Adjustment obtains.
Further, when the result is judged as non-data frame, then gain adjustment is set as initial value, and the initial value is
The experiment value that the acoustic communication system obtains.
Further, the filtering frequency range of the bandpass filter is 10-18kHz.
Another aspect of the present invention also provides a kind of automatic gain control equipment of acoustic communication system, comprising: sound collection
Unit, bandpass filter, A/D analog-digital converter, FFT module, IFFT module, acoustic communication data frame detection module, automatic increasing
Beneficial control module and acoustic communication unit；
The sound collection unit, for acquiring acoustic signals and being transmitted to bandpass filter；The bandpass filter, for filtering
Except the garbage signals frequency range such as noise, required signal frequency range is obtained, reduces the interference to useful signal such as noise；The A/D mould
Number converter, for speech simulation signal to be converted to digital signal；The FFT module, for turning the digital signal of time domain
The signal of frequency domain is changed into, convenient for the digital operation processing to signal；The acoustic communication data frame detection module, for conversion
Frequency-region signal afterwards carries out the detection of acoustic communication data frame and result judges；The automatic growth control module, for sentencing
Break and carries out corresponding gain process for the signal of acoustic communication data frame；The IFFT module, for converting the signal of frequency domain
At the digital signal of time domain；The acoustic communication unit, for completing the dissection process of acoustic communication agreement.
Further, the sound collection unit is microphone.
Further, the acoustic communication unit includes synchronization module, demodulation module, decoder module and correction verification module.
As shown from the above technical solution, the auto gain control method and dress of a kind of acoustic communication system provided by the invention
It sets, the acoustic signals of acquisition is filtered by bandpass filter, obtain effective sound wave frequency range, be then converted into digital signal
And the detection of acoustic communication data frame is carried out to it and result judges, when result is judged as acoustic communication data frame, according to setting
Fixed target amplitude value carries out gain adjustment to current demand signal, carrys out linear gradual processing phase with tradition with the length of voice communication frame
It is handled than, the present invention with the length of acoustic communication data frame, under the premise of signal does not generate distortion spectrum after guarantee processing,
It shortens the processing entry-into-force time and improves processing speed, form visible and safe gain to signal.In addition, the present invention program
It is filtered using filter, cuts and select effective acoustic signals, and increase to being judged as that the signal of non-acoustic communication data frame is not done
Benefit is managed and is directly exported, and treatment effeciency is substantially increased.
Detailed description of the invention
Fig. 1 is the auto gain control method flow chart of acoustic communication system in the present invention；
Fig. 2 is acoustic communication data frame detection method flow chart in the present invention；
Fig. 3 is the automatic gain control equipment schematic diagram of acoustic communication system in the present invention；
Fig. 4 is acoustic communication unit composed structure schematic diagram in the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
Fig. 3 is the automatic gain control equipment schematic diagram of acoustic communication system in the present invention, and a kind of sound wave of the invention is logical
The automatic gain control equipment of letter system, comprising: sound collection unit 1, bandpass filter 2, A/D analog-digital converter 3, FFT mould
Block 4, acoustic communication data frame detection module 5, automatic growth control module 6, IFFT module 7 and acoustic communication unit 8.
Fig. 4 is acoustic communication unit composed structure schematic diagram in the present invention, and acoustic communication unit of the present invention includes: synchronous mould
Block 81, demodulation module 82, decoder module 83 and correction verification module 84.
Fig. 1 is the auto gain control method flow chart of acoustic communication system in the present invention, and Fig. 2 is that sound wave is logical in the present invention
Letter data frame detection method flow chart, below in conjunction with Fig. 1,2,3 and Fig. 4 to technical principle of the invention, implementation method and device
Detailed description are as follows:
S1: acquiring acoustic signals by sound collection unit 1 first, and sound collection unit is microphone, Mike in the present embodiment
Collected acoustic signals are exported and are amplified to operational amplifier by wind, and the signal of amplification is then inputted bandpass filter 2
It is filtered, bandpass filter will filter out the high-frequency signal of 10KHz low frequency signal below and 18KHz or more, filter by band logical
The signal that effective sound wave frequency range within the scope of 10-18KHz is obtained after the filtering of wave device, not only greatly reduces noise etc. to useful letter
Number interference, while also improving treatment effeciency；
S2: the analog signal of sound wave frequency range effective within the scope of the 10-18KHz obtained after filtering is passed through 3 turns of A/D analog-digital converter
It is changed to digital signal；
S3: the detection of acoustic communication data frame is carried out to the digital signal after conversion.
Fig. 2 is acoustic communication data frame detection method flow chart in the present invention, below in conjunction with Fig. 2, to sound wave of the invention
The method and step of communications data frame detection, is specifically described as follows:
S31: reading digital signal according to sample frequency first, and in the present embodiment, sample frequency is set as 256 in advance, such as not complete
It is acquired at 256 sampling points, then returns and continue to acquire, a FFT operation frame sampling is completed after completing 256 sampling point acquisitions,
As current operation window frame；
S32: 256 PCM sampling points are disposably read from A/D analog-digital converter 3 using FFT conversion module 4 and do frequency domain conversion；
Gain adjustment processing is carried out again after doing frequency domain conversion to signal, gain adjustment is made to have more specific aim, only to useful signal frequency range
The case where adjusting, not only increase treatment effeciency, distortion spectrum can also be avoided to the maximum extent generation；
S33: and then acoustic communication data are carried out to the sampled signal after frequency domain conversion by acoustic communication data frame detection module 5
Frame detection judges with result:
S331: extracting the carrier frequency point value of the acoustic communication of predetermined quantity using normal distribution mode, scheduled in the present embodiment
Extracting carrier frequency point value quantity is 20, and calculates separately and obtain corresponding range value PKamp；The extraction of carrier frequency point value
Mode can also be carried out by random manner, and the extraction number of carrier frequency point value depends on demodulation module in acoustic communication unit 8
Modulation system used by 82, specifically, the number range extracted is 5 ~ 40；
S332: calculate the cumulative of above-mentioned 20 bin magnitudes values PKamp and:
PKSUM=PKamp0+PKamp1+PKamp2 ... PKamp19, then by the cumulative of bin magnitudes value and with it is preset
Threshold value is compared, to judge whether digital signal is acoustic communication data frame；
The judgement formula for carrying out the judgement of acoustic communication data frame using PKSUM is as follows:
VA=1 if PKSUM >=PKTHD, then then judges the window frame signal for data frame；
VA=0 if PKSUM < PKTHD, then, then judge the window frame signal for non-data frame；
Wherein, PKTHD is the threshold value of setting；
S4: if judging result is data frame, generating gain adjustment data, and acoustic communication data frame detection module 5 is by gain
Adjustment data are exported to the gain adjustment input terminal of automatic growth control module 6, and automatic growth control module 6 is according to acoustic communication
The gain adjustment data that data frame detection module 5 transmits carries out at corresponding gain the frequency-region signal that FFT conversion module 4 exports
Reason；Specifically, gain adjustment data is obtained by comparing the digital signal parameters of current operation window frame and previous operation window frame.
After automatic growth control module 6 carries out corresponding gain process, signal is exported to IFFT module 7；IFFT module 7
Frequency-region signal after gain process is converted into the digital signal of time domain, acoustic communication number of the final output through gain adjustment again
According to acoustic communication unit 8；The dissection process of acoustic communication agreement is completed by acoustic communication unit 8；Enter next operation later
The sample magnitude of frame is read and operation.
If judging result is non-data frame, initial value is set by the gain of automatic growth control module 6, specifically
Ground, the initial value are the experiment value that acoustic communication system obtains；The sample magnitude for entering next operation frame later is read and operation.
The energy of sonic data input is usually the process changed from small to big when entering system, but when sonic data inputs
At the end of, then it is therefore, as further preferred scheme, to be generated quickly by the sound change of tune at asonant state procedure
The method of gain adjustment data further include: when acoustic energy is continuously less than setting lower limit, then quickly reduce automatic growth control
Gain, the still lasting amplification under high-gain numerical value to avoid environmental noise, cause acoustic communication data frame detect in erroneous judgement.
In summary, the auto gain control method and device of a kind of acoustic communication system provided by the invention, will acquire
Acoustic signals be filtered by bandpass filter, obtain effective sound wave frequency range, be then converted into digital signal and to its into
The detection of row acoustic communication data frame and result judge, when result is judged as acoustic communication data frame, according to the target of setting
Range value carries out gain adjustment to current demand signal, compared with tradition carrys out linear gradual processing with the length of voice communication frame, this hair
The bright length with acoustic communication data frame is handled, and under the premise of signal does not generate distortion spectrum after guarantee processing, is shortened
It handles the entry-into-force time and improves processing speed, form visible and safe gain to signal.In addition, the present invention program is using filter
Wave device is filtered, and is cut and is selected effective acoustic signals, and to being judged as that the signal of non-acoustic communication data frame do not do gain process
And directly export, substantially increase treatment effeciency.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however and invent be not limited thereto.All within the spirits and principles of the present invention, it is made it is any modification, equally replace
It changes and improves, should be included within the scope of the present invention.
Claims (10)
1. a kind of auto gain control method of acoustic communication system, which comprises the following steps:
S1: acquisition acoustic signals will be filtered after acoustic signals amplification by bandpass filter；
S2: filtered acoustic signals are converted into digital signal；
S3: the detection of acoustic communication data frame is carried out to the digital signal and result judges；
S4: when the result is judged as acoustic communication data frame, current demand signal is increased according to the target amplitude value of setting
Benefit adjustment.
2. a kind of auto gain control method of acoustic communication system according to claim 1, which is characterized in that the step
Rapid S3 is specifically included:
S31: the digital signal is sampled by the audio sample rate set；
S32: and then time-frequency domain conversion is carried out to the digital signal of sampling；
S33: the detection of acoustic communication data frame is carried out to the sampled signal after frequency domain conversion again and is judged with result:
S331: the carrier frequency point value of the acoustic communication of predetermined quantity is extracted to the frequency-region signal after conversion first, and is calculated separately
Obtain corresponding range value PKamp；
S332: calculate the cumulative of the carrier frequency point range value PKamp of the predetermined quantity and, by it is described cumulative and with preset
Threshold value be compared, judge whether the digital signal is acoustic communication data frame；If described add up and be greater than or equal to pre-
The threshold value first set, then result is judged as data frame；If described add up and be less than preset threshold value, result is judged as non-
Data frame.
3. a kind of auto gain control method of acoustic communication system according to claim 2, which is characterized in that described to mention
Extracting method used by the value of frequency point of predetermined quantity is taken to be random extraction or extract by normal distribution mode.
4. a kind of auto gain control method of acoustic communication system according to claim 2 or 3, which is characterized in that institute
Stating predetermined quantity is 5 ~ 40.
5. the auto gain control method of any a kind of acoustic communication system according to claim 1 ~ 4, which is characterized in that
The target amplitude value is obtained by the comparison adjustment of the digital signal parameters of current operation window frame and previous operation window frame.
6. a kind of auto gain control method of acoustic communication system according to claim 2, which is characterized in that when described
When being as a result judged as non-data frame, then gain adjustment is set as initial value, and the initial value is what the acoustic communication system obtained
Experiment value.
7. a kind of auto gain control method of acoustic communication system according to claim 1, which is characterized in that the band
The filtering frequency range of bandpass filter is 10-18kHz.
8. a kind of automatic gain control equipment of acoustic communication system characterized by comprising sound collection unit, band logical filter
Wave device, A/D analog-digital converter, FFT module, IFFT module, acoustic communication data frame detection module, automatic growth control module with
And acoustic communication unit；
The sound collection unit, for acquiring acoustic signals and being transmitted to bandpass filter；
The bandpass filter obtains required signal frequency range, reduces noise etc. pair for filtering out the garbage signals frequency range such as noise
The interference of useful signal；
The A/D analog-digital converter, for speech simulation signal to be converted to digital signal；
The FFT module, for the digital signal of time domain to be converted into the signal of frequency domain, at the digital operation to signal
Reason；
The acoustic communication data frame detection module, for carrying out the detection of acoustic communication data frame to the frequency-region signal after conversion
Judge with result；
The automatic growth control module, for the corresponding gain process of signal progress for being judged as acoustic communication data frame；
The IFFT module, for the signal of frequency domain to be converted into the digital signal of time domain；
The acoustic communication unit, for completing the dissection process of acoustic communication agreement.
9. a kind of automatic gain control equipment of acoustic communication system according to claim 8, which is characterized in that the sound
Sound acquisition unit is microphone.
10. a kind of automatic gain control equipment of acoustic communication system according to claim 8, which is characterized in that described
Acoustic communication unit includes synchronization module, demodulation module, decoder module and correction verification module.
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Cited By (3)
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| CN112235053A (en) * | 2020-09-29 | 2021-01-15 | 上海特金无线技术有限公司 | Communication method, device and equipment, and storage medium |
| CN112564655A (en) * | 2019-09-26 | 2021-03-26 | 大众问问(北京)信息科技有限公司 | Audio signal gain control method, device, equipment and storage medium |
| CN112929096A (en) * | 2021-01-27 | 2021-06-08 | 嘉兴中科声学科技有限公司 | Sound signal processing method and device and electronic equipment |
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