CN103888884B - Loudspeaker detecting method and device - Google Patents
Loudspeaker detecting method and device Download PDFInfo
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- CN103888884B CN103888884B CN201410132934.0A CN201410132934A CN103888884B CN 103888884 B CN103888884 B CN 103888884B CN 201410132934 A CN201410132934 A CN 201410132934A CN 103888884 B CN103888884 B CN 103888884B
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Abstract
The invention discloses a loudspeaker detecting method and device. The loudspeaker detecting method comprises the steps that a working voltage smaller than a sound production threshold value is connected to the input end of a loudspeaker to be detected, so that the loudspeaker to be detected only vibrates and does not produce sounds; a test sound signal in a rear chamber of the loudspeaker to be detected is obtained; the test sound signal is amplified; whether the amplified test sound signal is larger than a preset reference value is judged; it is judged that air leakage occurs on the rear chamber of the loudspeaker to be detected if yes. The loudspeaker detecting method and device can be used for detecting the air tightness of the rear chamber of the loudspeaker.
Description
Technical field
The application is related to loudspeaker technical field of measurement and test, more specifically to a kind of loudspeaker detection method and device.
Background technology
With continuing to develop for science and technology, performance requirement of the people to the portable electric appts with multi-media player function
Also more and more higher.Wherein, the audio result of broadcast of the portable electric appts with multi-media player function is to weigh its many matchmaker
One important indicator of body playing function characteristic.
Metal composite pad pasting loudspeaker due to having the advantages that preferable bass effect, sensitivity high, small volume, thickness of thin,
Preferred loudspeaker as current most of portable electric appts with multi-media player function.Metal composite pad pasting loudspeaker pair
The seal requirement of rear chamber is higher, if its rear chamber's gas leakage, can not only influence the bass effect of loudspeaker, and can cause loudspeaker
Burn out.
But, the detection to loudspeaker in the prior art is only limitted to the detection of circuit connection or under particular test signal
The detection of tonequality, not a kind of method and apparatus of special detection loudspeaker back cavity chamber air-tightness, cause loudspeaker in use by
Burnt out in rear chamber's gas leakage.So, how to detect that loudspeaker back cavity chamber air-tightness is a current problem urgently to be resolved hurrily.
The content of the invention
In order to solve the above technical problems, the application provides a kind of loudspeaker detection method and device, for detecting loudspeaker back cavity
The air-tightness of room, it is to avoid loudspeaker are due to damaging caused by rear chamber's gas leakage.
To achieve the above object, the application provides following technical scheme：
A kind of loudspeaker detection method, the detection method includes：
The input of loudspeaker to be detected accesses an operating voltage less than vocalization threshold, the loudspeaker to be detected is only shaken
Dynamic not sounding；
Obtain the test voice signal of the loudspeaker rear chamber to be detected；
Signal enhanced processing is carried out to the test voice signal；
Judge the test voice signal after enhanced processing whether more than reference value set in advance；
If it is, judging the loudspeaker rear chamber to be detected gas leakage.
Preferably, it is described that the test voice signal is carried out by signal enhanced processing included in above-mentioned detection method：
The test voice signal is converted into analog electrical signal；
The analog electrical signal is amplified.
Preferably, in above-mentioned detection method, before the judgement, further include：By the analog telecommunications after amplification
Number be converted to data signal.
Preferably, in above-mentioned detection method, the method is further included：
Analog electrical signal after amplification is input in the loudspeaker to be detected；
Judge whether the loudspeaker send sound；
If it is, judging the loudspeaker rear chamber to be detected gas leakage.
Preferably, in above-mentioned detection method, the test voice signal of the loudspeaker rear chamber to be detected is repeatedly obtained, point
It is other that multiple test voice signal is carried out by signal transacting and is separately input in the loudspeaker to be detected,
The method is further included：
Judge whether the loudspeaker send sound；
If it is, judging the loudspeaker rear chamber to be detected gas leakage.
Preferably, in above-mentioned detection method, the test sound of the loudspeaker rear chamber to be detected is obtained using microphone
Signal, the microphone is arranged on loudspeaker rear chamber to be detected position.
Present invention also provides a kind of loudspeaker detection means, loudspeaker to be detected are detected using the detection means
When, it is that the input of the loudspeaker to be detected accesses an operating voltage less than vocalization threshold, make the loudspeaker to be detected only
Not sounding is shaken, the detection means includes：
Sound collection unit, signal processing unit, judging unit and determining unit, wherein：
The sound collection unit is arranged on the rear chamber of the loudspeaker to be detected, exists for gathering the loudspeaker to be detected
The test voice signal of the operating voltage Xia Shi rear chamber；
The signal processing unit is used to carry out signal enhanced processing to the test voice signal；
Whether the judging unit is used to judge the test voice signal after enhanced processing more than reference value set in advance；
The determining unit is used to judge when the test voice signal after treatment is more than the reference value, it is determined that described treat
The gas leakage of detection loudspeaker rear chamber.
Preferably, in above-mentioned detection device, the processing unit includes：
Sound processing chip, the sound processing chip is used to for the test voice signal to be converted to analog electrical signal；
Amplifier, the amplifier is used to be amplified the analog signal.
Preferably, in above-mentioned detection device, also include：
Analog-digital converter, the analog-digital converter is used to for the analog signal to be converted to data signal.
Preferably, in above-mentioned detection device, the output end of the amplifier connects with the input of the loudspeaker to be detected
Connect.
Preferably, in above-mentioned detection device, also include：Detect whether the voice recognition of sounding is filled the loudspeaker to be detected
Put.
Preferably, in above-mentioned detection device, the sound collection unit is microphone.
From above-mentioned technical proposal as can be seen that loudspeaker detection method provided herein is examined to loudspeaker to be detected
It is that the loudspeaker to be detected access an operating voltage less than vocalization threshold during survey, the loudspeaker to be detected is only shaken not
Sounding, the sound sent when thus can avoid sound horn is covered to loudspeaker rear chamber gas leakage sound, if described treat
Detection loudspeaker rear chamber gas leakage, then vibrations will cause that the air in its rear chamber sends sound in air-leak section friction, i.e., now
There is the voice signal to be tested of setting intensity in the loudspeaker rear chamber to be detected, the voice signal to be tested is amplified
After treatment with setting reference value contrast i.e. can determine that the loudspeaker to be detected whether gas leakage.
Brief description of the drawings
In order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of application, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
A kind of schematic flow sheet of loudspeaker detection method that Fig. 1 is provided for the embodiment of the present application；
A kind of structural representation of loudspeaker detection means that Fig. 2 is provided for the embodiment of the present application；
A kind of structural representation of the signal processing unit of loudspeaker detection means that Fig. 3 is provided for the embodiment of the present application.
Specific embodiment
As described in background, the detection in the prior art to loudspeaker is only limitted to the detection of circuit connection or in spy
The detection of tonequality under location survey trial signal, not a kind of method and apparatus of special detection loudspeaker back cavity chamber air-tightness, causes loudspeaker
Burnt out due to rear chamber's gas leakage in use.So, how to detect that loudspeaker back cavity chamber air-tightness is current urgently to be resolved hurrily
One problem.
Inventor's research finds, separately through ear recognition, it is impossible to detect the air-tightness of the rear chamber of loudspeaker, because
If the air-tightness of loudspeaker rear chamber is bad, there is leakage problem, windage sound very little caused by gas leakage, it is impossible to enough by people
Recognize.And, the air-tightness of loudspeaker rear chamber also cannot be simply detected only by voice collection device, because, loudspeaker
During sounding, the sound that loudspeaker send can cause rear chamber's gas leakage with the windage sound mix of loudspeaker rear chamber gas leakage
Detection cannot be realized.
Based on the studies above, the embodiment of the present application provides a kind of detection loudspeaker detection method, and the method includes：
The input of loudspeaker to be detected accesses an operating voltage less than vocalization threshold, the loudspeaker to be detected is only shaken
Dynamic not sounding；
Obtain the test voice signal of the loudspeaker rear chamber to be detected；
Signal enhanced processing is carried out to the test voice signal；
Judge the test voice signal after enhanced processing whether more than reference value set in advance；
If it is, judging the loudspeaker rear chamber to be detected gas leakage.
The loudspeaker detection method is that the loudspeaker to be detected access an operating voltage less than vocalization threshold, is made described
Loudspeaker to be detected only shake not sounding, and the sound sent when thus can avoid sound horn is to loudspeaker rear chamber gas leakage sound
Cover, if the loudspeaker rear chamber to be detected gas leakage, vibrations will cause that the air in its rear chamber rubs in air-leak section
Wiping sends sound, i.e., now described loudspeaker rear chamber to be detected has the voice signal to be tested of setting intensity, will be described to be measured
Examination voice signal be amplified treatment after with setting reference value contrast can determine that the loudspeaker to be detected whether gas leakage.
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on
Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of the application protection.
Many details are elaborated in the following description in order to fully understand the application, but the application can be with
Other manner described here is different from using other to implement, those skilled in the art can be without prejudice to the application intension
In the case of do similar popularization, therefore the application is not limited by following public specific embodiment.
Secondly, the application combination schematic diagram is described in detail, when the embodiment of the present application is described in detail, for purposes of illustration only, table
The schematic diagram of showing device structure can disobey general ratio and make partial enlargement, and the schematic diagram is example, and it should not herein
The scope of limitation the application protection.Additionally, the three-dimensional space of length, width and height should be included in actual fabrication.
Based on above-mentioned thought, the embodiment of the present application provides a kind of loudspeaker detection method, with reference to Fig. 1, the loudspeaker detection side
Method includes：
Step S1：The input of loudspeaker to be detected accesses an operating voltage less than vocalization threshold, makes described to be detected
Loudspeaker only shake not sounding.
If the air-tightness of loudspeaker rear chamber is bad, there is leakage problem, during in order to avoid loudspeaker normal work, rear chamber
The sound mix that the windage sound of gas leakage sends with loudspeaker, the embodiment of the present application is only that the input of loudspeaker to be detected is accessed
One operating voltage less than vocalization threshold so that the band detection loudspeaker only shake not sounding.
So, if loudspeaker gas leakage, then shake the air concussion caused in loudspeaker rear chamber, air can be sent out in air-leak section
Life rubs and sounding.
Step S2：Obtain the test voice signal of the loudspeaker rear chamber to be detected.
The test voice signal can be obtained by voice recognition devices such as microphones.The voice recognition device is set
In the rear chamber position of the loudspeaker to be detected.
Step S3：Signal enhanced processing is carried out to the test voice signal.
The windage sound of loudspeaker rear chamber to be detected is smaller, and, one is provided in the present embodiment is less than sounding
The operating voltage of threshold value, it is smaller than normal operating voltage, therefore the more difficult windage sound for detecting gas leakage, so,
Obtain after the test voice signal of the loudspeaker rear chamber to be detected, it is necessary to carry out signal enhanced processing to it.
The implementation of the step S3 can include：The test voice signal is converted into analog electrical signal；To institute
Analog electrical signal is stated to be amplified.By above-mentioned conversion and enhanced processing, can will test voice signal be converted to amplitude compared with
Big analog electrical signal, is easy to follow-up judgement to process.
The step S3 also includes：The analog electrical signal after by amplification is converted to data signal.By the simulation electricity
Signal is converted to the data signal of digital quantization, is easy to observation and follow-up contrast deterministic process, improves detection efficiency.Using
Analog electrical signal after amplification quickly can be converted to corresponding data signal by analog-digital converter.
Step S4：Judge the test voice signal after enhanced processing whether more than reference value set in advance.
One reference value set in advance is set, the test voice signal after enhanced processing is compared with the reference value,
So as to judge loudspeaker rear chamber to be detected whether gas leakage.
If previous step is converted to data signal by described, in this step only need to by the digital electric signal with
The reference value contrast of setting.
If the analog electrical signal after amplification is not converted to data signal by previous step, needing in this step will be upper
The virtual value for stating the analog electrical signal after amplifying compares with the reference value.
Step S5：If it is, judging the loudspeaker rear chamber to be detected gas leakage.
If the test voice signal after enhanced processing is more than the reference value, prove that the loudspeaker to be detected have gas leakage
Problem, illustrates that the air-tightness of the loudspeaker to be detected is bad.Conversely, not existing leakage problem then, the gas of the loudspeaker to be detected is illustrated
Close property is good.
Above-mentioned detection method is that the loudspeaker to be detected access an operating voltage less than vocalization threshold, is made described to be checked
Survey loudspeaker and only shake not sounding, the sound sent when thus can avoid sound horn is covered to loudspeaker rear chamber gas leakage sound
Lid, if the loudspeaker rear chamber to be detected gas leakage, vibrations will cause the interior air of its rear chamber in air-leak section friction
Sound is sent, i.e., now described loudspeaker rear chamber to be detected has the voice signal to be tested of setting intensity, will be described to be tested
Voice signal be amplified treatment after with setting reference value contrast can determine that the loudspeaker to be detected whether gas leakage.
Above-mentioned deterministic process is to compare the test voice signal after enhanced processing with the reference value of setting, big by the two
It is small come judge the loudspeaker to be detected whether there is gas leakage, although loudspeaker continuous vibration in test process, but collection number
It is that a data signal or analog telecommunications are good eventually for what is compared with reference value according to the test voice signal for being a certain moment
Virtual value, i.e. deterministic process is to be compared two specific numerals, if collecting larger interference in test process
Acoustic information, then can cause erroneous judgement, no matter the loudspeaker to be detected whether gas leakage, judged result is all gas leakage.Therefore, using upper
The method of stating is needed by multiple judged result, and erroneous judgement problem that may be present is eliminated by the multiple statistics for judging, is caused
Detection efficiency is relatively low.
In the application another embodiment, in order to quick and precisely detect the loudspeaker rear chamber to be detected whether gas leakage,
Further included in loudspeaker detection method described in above-described embodiment：Analog electrical signal after amplification is input to described to be detected
In loudspeaker；Judge whether the loudspeaker send sound；If it is, judging the loudspeaker rear chamber to be detected gas leakage.
Above-mentioned detection process is a time-continuing process, and the test voice signal of initial acquisition has carried out multiple conversion
With the cyclic process amplified.In test process, real process is：Repeatedly obtain the test sound of the loudspeaker rear chamber to be detected
Message number, carries out signal transacting and is separately input in the loudspeaker to be detected to multiple test voice signal respectively, judges institute
State whether loudspeaker send sound；If it is, judging the loudspeaker rear chamber to be detected gas leakage.
If the loudspeaker rear chamber to be detected gas leakage, during the entire process of testing it, the test sound
Message number is an acoustic information for persistently existing, and is converted into analog electrical signal and inputs to the loudspeaker to be detected after amplifying
, enable to the loudspeaker to be detected to send lasting sound, if specifically, loudspeaker gas leakage, in multi collect and amplified
After treatment, the analog electrical signal being input into the loudspeaker to be detected gradually increases, therefore, its sound for sending is gradually to increase
Big lasting howling.If loudspeaker back cavity chamber air-tightness is good, even if there is an accidental interference sound in test process,
Now only result in loudspeaker and an of short duration sound is sent in test process, can't continue.
By foregoing description, loudspeaker detection method described in the present embodiment can fast and accurately detect loudspeaker to be detected
The air-tightness of rear chamber.
Another embodiment of the application additionally provides a kind of loudspeaker detection means, using the detection means to be detected
It is that the input of the loudspeaker to be detected accesses an operating voltage less than vocalization threshold when loudspeaker are detected, makes described
Loudspeaker to be detected only shake not sounding.
With reference to Fig. 2, the loudspeaker detection means includes：Sound collection unit 1, signal processing unit 2, the and of judging unit 3
Determining unit 4.
The sound collection unit 1 is arranged on the rear chamber of the loudspeaker to be detected, for gathering the loudspeaker to be detected
In the test voice signal of the operating voltage Xia Shi rear chamber.
The signal processing unit 2 is used to carry out signal enhanced processing to the test voice signal.
Whether the judging unit 3 is used to judge the test voice signal after enhanced processing more than reference set in advance
Value.The judging unit 3 can be comparison circuit.
The determining unit 4 be used for judge when the test voice signal after enhanced processing more than the reference value when, it is determined that
The loudspeaker rear chamber to be detected gas leakage.The determining unit 4 can be controller.
Fig. 2 illustrated embodiments, sound collection unit 1 collection loudspeaker to be detected test voice signal by signal at
After reason unit 2 carries out signal enhanced processing, voice signal will be tested with the reference for setting after enhanced processing by judging unit 3
Value compares, when the test voice signal after judging unit 3 judges enhanced processing is more than the reference value, by determining unit 4
Determine the loudspeaker rear chamber to be detected gas leakage.
Signal processing unit 2 is to carry out signal enhanced processing after test voice signal is converted into analog telecommunications, is then sentenced
Disconnected unit 3 compares the analog electrical signal after enhanced processing with setting reference value, now needs the virtual value of analog electrical signal
Compare with the reference value.
In other embodiments, the loudspeaker detection means can also further include：Analog-digital converter, the mould
Number converter is used to for the analog signal to be converted to data signal.The analog-digital converter can be arranged at the signal
Between reason unit 2 and the judging unit, now, signal processing unit 2 is converted to analog electrical signal by voice signal is tested, and
After carrying out signal enhanced processing to the analog electrical signal, the analog-digital converter can turn the analog electrical signal after enhanced processing
Data signal is changed to, now, judging unit directly can compare the data signal with the reference value, improves work effect
Rate.
With reference to Fig. 3, the signal processing unit 2 includes：Sound processing chip 5, the sound processing chip 5 is used for institute
State test voice signal and be converted to analog electrical signal；Amplifier 6, the amplifier 6 is used to be amplified the analog signal.
The sound processing chip 5 includes：Digital signal processor DSP (digital signal processor), receive
Words device 7, L channel device 8 and R channel device 9.Wherein, receiver 7 is by receiver input port 10 and the numeral letter
Number processor DSP connection, L channel device 8 is connected by L channel port 11 with the digital signal processor DSP, R channel
Device 9 is connected by R channel port 12 with the digital signal processor DSP.
The sound collection unit 1 can be the voice recognition devices such as microphone.Tested to loudspeaker to be detected 13
When, microphone sets the rear chamber position of loudspeaker to be detected 13, and by the output end of the microphone and sound processing chip 5
Ear microphone input 14 connect, and then cause the microphone connected with digital signal processor DSP, in order to described
The test voice signal of collection is sent to sound processing chip 5 and is processed by microphone.
In the embodiment shown in fig. 3, the output end of the amplifier 6 connects with the input of the loudspeaker to be detected 13
Connect.So, the test voice signal of the loudspeaker rear chamber for being obtained by microphone is sent to by ear microphone input 14
The digital signal processor DSP, is converted to analog electrical signal, then analog telecommunications by the digital signal processor DSP
Number again by being conveyed to loudspeaker to be detected 13 as input signal after the amplification of amplifier 6.Now loudspeaker to be detected 13 export one
New test voice signal, is so repeated several times said process.
Foregoing description is that in actual test, the propagation of electric signal is very for the ease of understanding the course of work of detection
Quickly, as long as according to Fig. 3 illustrated embodiment connecting components, if the gas leakage of loudspeaker rear chamber, moment loudspeaker will be caused
Send and persistently utter long and high-pitched sounds.
Processing unit 2 shown in Fig. 3 can directly pass through loudspeaker to be detected 13 with the connecting test mode of loudspeaker to be detected 13
Itself whether send when sound judges its rear chamber whether gas leakage, test is accurate and testing efficiency is high.Further, the loudspeaker
Detection means also includes：Detect the loudspeaker to be detected whether the voice recognition device of sounding.The voice recognition device is set
In the sound vibrations face position of the loudspeaker to be detected, when the loudspeaker send sound, the voice recognition device can lead to
Cross the modes such as optical signal shows or image shows and show the loudspeaker rear chamber to be detected gas leakage so that the result of determination
Display is not limited only to sound and shows.
By foregoing description, loudspeaker detection means can detect the air-tightness of loudspeaker rear chamber described in the present embodiment,
Can quickly and accurately judge loudspeaker rear chamber whether gas leakage.
It should be noted that referenced herein verb " including ", "comprising" and its paradigmatic using being not excluded for
The presence of element or step in addition to those elements or step described in application documents.Article " one " before element or
" one " is not excluded for the presence of multiple this elements.
Although describing spirit herein and principle by reference to some specific embodiments, it should be appreciated that, this
Application is not limited to disclosed specific embodiment, and the division to each side does not mean that the feature in these aspects can not yet
Combination is this to divide merely to the convenience of statement to be benefited.The application be intended to appended claims spirit and
In the range of included various modifications and equivalent arrangements.Scope of the following claims meets broadest explanation, so that comprising
All such modifications and equivalent structure and function.
Claims (12)
1. a kind of loudspeaker detection method, it is characterised in that including：
The input of loudspeaker to be detected accesses an operating voltage less than vocalization threshold, the loudspeaker to be detected is only shaken not
Sounding；
Obtain the test voice signal of the loudspeaker rear chamber to be detected；
Signal enhanced processing is carried out to the test voice signal；
Judge the test voice signal after enhanced processing whether more than reference value set in advance；
If it is, judging the loudspeaker rear chamber to be detected gas leakage.
2. method according to claim 1, it is characterised in that described to be carried out at signal amplification to the test voice signal
Reason includes：
The test voice signal is converted into analog electrical signal；
The analog electrical signal is amplified.
3. method according to claim 2, it is characterised in that before the judgement, further include：After amplification
Analog electrical signal is converted to data signal.
4. detection method according to claim 2, according to characterized in that, the method is further included：
Analog electrical signal after amplification is input in the loudspeaker to be detected；
Judge whether the loudspeaker send sound；
If it is, judging the loudspeaker rear chamber to be detected gas leakage.
5. detection method according to claim 4, it is characterised in that repeatedly obtain the survey of the loudspeaker rear chamber to be detected
Examination voice signal, carries out signal transacting and is separately input in the loudspeaker to be detected to multiple test voice signal respectively,
The method is further included：
Judge whether the loudspeaker send sound；
If it is, judging the loudspeaker rear chamber to be detected gas leakage.
6. detection method according to claim 1, it is characterised in that obtain the loudspeaker back cavity to be detected using microphone
The test voice signal of room, the microphone is arranged on loudspeaker rear chamber to be detected position.
7. a kind of loudspeaker detection means, it is characterised in that be institute when being detected to loudspeaker to be detected using the detection means
The input for stating loudspeaker to be detected accesses an operating voltage less than vocalization threshold, the loudspeaker to be detected is only shaken and does not send out
Sound, the detection means includes：
Sound collection unit, signal processing unit, judging unit and determining unit, wherein：
The sound collection unit is arranged on the rear chamber of the loudspeaker to be detected, for gathering the loudspeaker to be detected described
The test voice signal of operating voltage Xia Shi rear chamber；
The signal processing unit is used to carry out signal enhanced processing to the test voice signal；
Whether the judging unit is used to judge the test voice signal after enhanced processing more than reference value set in advance；
The determining unit is used to judge when the test voice signal after enhanced processing is more than the reference value, it is determined that described treat
The gas leakage of detection loudspeaker rear chamber.
8. detection means according to claim 7, it is characterised in that the processing unit includes：
Sound processing chip, the sound processing chip is used to for the test voice signal to be converted to analog electrical signal；
Amplifier, the amplifier is used to be amplified the analog signal.
9. detection means according to claim 8, it is characterised in that also include：
Analog-digital converter, the analog-digital converter is used to for the analog signal to be converted to data signal.
10. detection means according to claim 7, it is characterised in that the output end of the amplifier is to be detected with described
The input connection of loudspeaker.
11. detection means according to claim 10, it is characterised in that also include：Whether detect the loudspeaker to be detected
The voice recognition device of sounding.
12. detection means according to claim 7, it is characterised in that the sound collection unit is microphone.
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| CN201410132934.0A CN103888884B (en) | 2014-04-03 | 2014-04-03 | Loudspeaker detecting method and device |
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| CN107135456B (en) * | 2017-04-27 | 2020-12-08 | 歌尔智能科技有限公司 | Sound box air leakage detection device and method and computer readable storage medium |
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| CN103546853A (en) * | 2013-09-18 | 2014-01-29 | 浙江中科电声研发中心 | Speaker abnormal sound detecting method based on short-time Fourier transformation |
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