CN102316395A - Method and device for judging and eliminating howlround - Google Patents
Method and device for judging and eliminating howlround Download PDFInfo
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Abstract
The invention provides a method for judging and eliminating howlround, which comprises the steps of: sensing vibration data of a speaker through a sensor module; computing the vibration data in a certain time to obtain characteristic data, wherein the characteristic data comprises one or more frequency, amplitude and enveloped data; judging whether the speaker generates howlround or whether the speaker is in an initial stage of generating the howlround according to the characteristic data; when judging that the speaker is about to generate howlround, carrying out howlround preventive elimination on a sound signal to be output according to prestored howlround frequency point data; and when judging that the speaker is in the initial stage of generating the howlround, eliminating a howlround signal in the sound signal to be output in real time. Correspondingly, the embodiment of the invention also provides a device for eliminating the howlround. By using the method and the device provided by the embodiment of the invention, the howlround can be simply and conveniently judged and eliminated with low cost.
Description
Technical field
The present invention relates to electronic applications, relate in particular to a kind of method and apparatus of uttering long and high-pitched sounds and judging and eliminating.
Background technology
In the sound effect system of microphone and loud speaker composition; A part of voice signal of loud speaker output tends to get into system equipment output once more through microphone; Owing to have such positive feedback phenomenon, after speaker output signal intensity reaches the system equipment full scale, will utter long and high-pitched sounds; The operate as normal of destruction system, the inhibition of therefore need uttering long and high-pitched sounds.
In order to address this problem; The method that multiple elimination is uttered long and high-pitched sounds has been proposed in the prior art; Wherein, Chinese invention patent number is: in 200580006536.3 the patent, introduced and a kind ofly utilized two microphones to eliminate the method for uttering long and high-pitched sounds; After amplify the purpose sound of receiving from the 1st microphone the inhibition enlarging section it is uttered long and high-pitched sounds as what expansion sound produced when loud speaker sends; Produce and to receive with said the 1st microphone and corresponding the 1st power spectrum of the 1st acoustic signal of output, produce with relate to comprise said expansion sound at least and do not comprise said purpose sound with corresponding the 2nd power spectrum of the 2nd acoustic signal, then according to said the 1st power spectrum and said the 2nd power spectrum; Said the 1st acoustic signal of filtering, and the acoustic signal that only will be referred to said purpose sound outputs to said enlarging section.And Chinese invention patent number is: in 200720050922.9 the patent; Introduced the automatic trap numeral of a kind of DSP frequency shifter; Comprise audio signal input circuit, analog to digital converter, DSP digital signal processor, band pass filter circuit and output amplifier circuit; Utilize the DSP digital signal processor automatically search utter long and high-pitched sounds a little and to a trap of uttering long and high-pitched sounds, to arrive the purpose that elimination is uttered long and high-pitched sounds.
In two kinds of above-mentioned methods, eliminate all more complicated of the method utter long and high-pitched sounds, and implement to be difficult for, be the judgement of uttering long and high-pitched sounds and eliminate the key of uttering long and high-pitched sounds.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the embodiment of the invention provides a kind of method and apparatus of uttering long and high-pitched sounds and judging and eliminating, and can judge simply and easily and eliminates and utter long and high-pitched sounds.
In order to solve the problems of the technologies described above, the embodiment of the invention provides a kind of method of uttering long and high-pitched sounds and judging and eliminating, and comprising:
Vibration data through sensor assembly sensing loud speaker;
Said vibration data in the certain hour is carried out computing obtain characteristic, said characteristic comprises one or more in frequency, amplitude and the envelope data;
Judge whether soon to utter long and high-pitched sounds or be not in the initial stage of uttering long and high-pitched sounds according to said characteristic;
When judging when soon uttering long and high-pitched sounds, treat the preventative elimination that output sound signal is uttered long and high-pitched sounds according to the frequency point data of uttering long and high-pitched sounds that prestores;
When judging when being in the initial stage of uttering long and high-pitched sounds, eliminate in real time and treat the signal of uttering long and high-pitched sounds in the output sound signal.
Wherein, before said vibration data, also comprise through sensor assembly sensing loud speaker:
Under debugging mode, sensor assembly sensing limber up period vibration data, the loudspeaker vibration data of the loudspeaker vibration data when said limber up period vibration data comprises system's operate as normal when uttering long and high-pitched sounds;
Vibration data in the certain hour in the said limber up period is carried out computing obtain characteristic, said characteristic comprises the Frequency point data, and the Frequency point data of preserving all places when taking place of uttering long and high-pitched sounds are as uttering long and high-pitched sounds frequency point data.
Wherein, said sensor assembly comprises acceleration transducer and/or gyroscope.
Wherein, when judging when soon uttering long and high-pitched sounds, the frequency point data of uttering long and high-pitched sounds that said basis prestores is treated the preventative elimination that output sound signal is uttered long and high-pitched sounds, and is specially:
According to the said frequency point data of uttering long and high-pitched sounds near the said signal of treating to be in the output sound signal frequency of uttering long and high-pitched sounds is carried out amplitude limit, or it is carried out narrow-band filtering, or it oppositely offsets, or it is carried out phase shift handle, the condition of uttering long and high-pitched sounds and producing with destruction;
When judging when being in the initial stage of uttering long and high-pitched sounds, the signal of uttering long and high-pitched sounds in the output sound signal is treated in said real-time elimination, is specially:
Treat that to said the signal of uttering long and high-pitched sounds in the output sound signal carries out amplitude limit according to the said frequency point data of uttering long and high-pitched sounds, or it is carried out narrow-band filtering, or it oppositely offsets, or it is carried out phase shift handle, the condition of uttering long and high-pitched sounds and producing with destruction.
Accordingly, the embodiment of the invention also provides a kind of uttering long and high-pitched sounds to judge and cancellation element, comprising:
The detection module of uttering long and high-pitched sounds is used for sensing loudspeaker vibration data, under normal real-time mode, to obtain the characteristic in the certain hour and under debugging mode, to obtain the frequency point data of uttering long and high-pitched sounds in the certain hour;
The processing module of uttering long and high-pitched sounds; Characteristic in the certain hour that is used for obtaining according to the said detection module of uttering long and high-pitched sounds judges whether soon to utter long and high-pitched sounds or be not in the initial stage of uttering long and high-pitched sounds; When judging when soon uttering long and high-pitched sounds, treat the preventative elimination that output sound signal is uttered long and high-pitched sounds according to the said frequency point data of uttering long and high-pitched sounds; When judging when being in the initial stage of uttering long and high-pitched sounds, eliminate in real time and treat the signal of uttering long and high-pitched sounds in the output sound signal.
Wherein, the said detection module of uttering long and high-pitched sounds comprises:
Sensor unit is used for the vibration data of sensing loud speaker;
Arithmetic element links to each other with said sensor unit, is used for the vibration data within a certain period of time of said sensor unit sensing is carried out computing, and to obtain characteristic, said characteristic comprises one or more in frequency, amplitude and the envelope data;
Transmitting element links to each other with said arithmetic element, is used for the said characteristic that said arithmetic element computing obtains is sent to the said processing module of uttering long and high-pitched sounds.
Wherein, said sensor unit also is used under debugging mode, sensing limber up period vibration data, the loudspeaker vibration data of the loudspeaker vibration data when said limber up period vibration data comprises system's operate as normal when uttering long and high-pitched sounds;
Said arithmetic element also is used for the vibration data in the certain hour in limber up period that said sensor unit senses is carried out computing, to obtain the frequency point data of uttering long and high-pitched sounds;
Said transmitting element also is used for the frequency point data of uttering long and high-pitched sounds that said arithmetic element computing obtains is sent to the said processor module of uttering long and high-pitched sounds.
Wherein, the said processing module of uttering long and high-pitched sounds comprises:
Receiving element is used to receive from the characteristic of the said detection module of uttering long and high-pitched sounds and the frequency point data of uttering long and high-pitched sounds;
Memory cell links to each other with said receiving element, is used to store the said frequency point data of uttering long and high-pitched sounds;
Judging unit, the characteristic that receives according to said receiving element judges whether soon to utter long and high-pitched sounds or be not in the initial stage of uttering long and high-pitched sounds;
Processing unit links to each other with judging unit with said memory cell respectively, is used for when said judgment unit judges goes out soon to utter long and high-pitched sounds, treating the preventative elimination that output sound signal is uttered long and high-pitched sounds according to the frequency point data of uttering long and high-pitched sounds that prestores; Or be used in said judgment unit judges source when initial stage of uttering long and high-pitched sounds, eliminating in real time and treating the signal of uttering long and high-pitched sounds in the output sound signal.
Wherein, said processing unit comprise to saidly treat to be in the output sound signal amplitude limit unit that near the signal the frequency of uttering long and high-pitched sounds or the signal of uttering long and high-pitched sounds carry out amplitude limit, to saidly treating to be in the output sound signal narrow-band filtering unit that near the signal the frequency of uttering long and high-pitched sounds or the signal of uttering long and high-pitched sounds carry out narrow-band filtering, treating to be in the output sound signal reverse offset unit that near the signal the frequency of uttering long and high-pitched sounds or the signal of uttering long and high-pitched sounds oppositely offset and treat to be in the output sound signal near the signal the frequency of uttering long and high-pitched sounds or the signal of uttering long and high-pitched sounds and carry out one or more in the phase-shifting unit that phase shift handles to said to said.
Wherein, said sensor unit comprises acceleration transducer and/or gyroscope.
Embodiment of the present invention embodiment is through the vibration data of sensor assembly sensing loud speaker; Said vibration data in the certain hour is carried out computing obtain characteristic, said characteristic comprises one or more in frequency, amplitude and the envelope data; Judge whether soon to utter long and high-pitched sounds or be not in the initial stage of uttering long and high-pitched sounds according to said characteristic; When judging when soon uttering long and high-pitched sounds, treat the preventative elimination that output sound signal is uttered long and high-pitched sounds according to the frequency point data of uttering long and high-pitched sounds that prestores; When judging when being in the initial stage of uttering long and high-pitched sounds, to eliminate in real time and treat the signal of uttering long and high-pitched sounds in the output sound signal, the method and apparatus that utilizes the embodiment of the invention to provide can realize the judgement and the elimination of uttering long and high-pitched sounds simply and easily, and cost is low.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 eliminates the method flow diagram of uttering long and high-pitched sounds in the embodiment of the invention;
Fig. 2 is a structure chart of eliminating the device of uttering long and high-pitched sounds in the embodiment of the invention;
Fig. 3 is the structural representation of processing unit among Fig. 2.
Embodiment
The embodiment of the invention provides a kind of method and apparatus of uttering long and high-pitched sounds and judging and eliminating, through the vibration data of sensor assembly sensing loud speaker; Said vibration data in the certain hour is carried out computing obtain characteristic, said characteristic comprises one or more in frequency, amplitude and the envelope data; Judge whether soon to utter long and high-pitched sounds or be not in the initial stage of uttering long and high-pitched sounds according to said characteristic; When judging when soon uttering long and high-pitched sounds, treat the preventative elimination that output sound signal is uttered long and high-pitched sounds according to the frequency point data of uttering long and high-pitched sounds that prestores; When judging when being in the initial stage of uttering long and high-pitched sounds, to eliminate in real time and treat the signal of uttering long and high-pitched sounds in the output sound signal, the method and apparatus that utilizes the embodiment of the invention to provide can realize the judgement and the elimination of uttering long and high-pitched sounds simply and easily, and cost is low.
Specify embodiments of the invention below in conjunction with accompanying drawing.
Referring to Fig. 1,, comprise the steps: for eliminating the method flow diagram of uttering long and high-pitched sounds in the embodiment of the invention
Step 101: through the vibration data of sensor assembly sensing loud speaker under normal real-time mode; Said sensor assembly is positioned at the detector end of uttering long and high-pitched sounds; The said detector of uttering long and high-pitched sounds is installed near the loudspeaker horn, and said sensor assembly comprises acceleration transducer and/or gyroscope.
Step 102: the said vibration data in the certain hour is carried out computing obtain characteristic, said characteristic comprises one or more in frequency, amplitude and the envelope data; Step 101 and step 102 are carried out in the detector end of uttering long and high-pitched sounds; After computing obtains characteristic in step 102; The detector end of uttering long and high-pitched sounds can send to the processor end of uttering long and high-pitched sounds through wired or wireless mode with said characteristic, lets the processor end of uttering long and high-pitched sounds carry out subsequent treatment.
Said step 101 and step 102 are all carried out in normal real-time mode, and the embodiment of the invention also comprises a kind of debugging mode, therefore before step 101, also can comprise:
A: under debugging mode, sensor assembly sensing limber up period vibration data, the loudspeaker vibration data when said limber up period vibration data comprises system's operate as normal, by normal to the transient vibration data of uttering long and high-pitched sounds with the loudspeaker vibration data when uttering long and high-pitched sounds;
B: the vibration data in the certain hour in the said limber up period is carried out computing obtain characteristic, said characteristic comprises the Frequency point data, and the Frequency point data of preserving all places when taking place of uttering long and high-pitched sounds are as uttering long and high-pitched sounds frequency point data.
Wherein, Under debugging mode; Sensor assembly can first sensing a period of time near the vibration data the loudspeaker during system operate as normal, can artificially seek out then and utter long and high-pitched sounds a little, so that the vibration data of sensor assembly loudspeaker annex when continuing that system utters long and high-pitched sounds in sensing a period of time; The vibration data of vibration data through to system's normal operating conditions time the when uttering long and high-pitched sounds analyzed computing; Can calculate and collect the major part frequency of uttering long and high-pitched sounds, the collected frequency of uttering long and high-pitched sounds sent to after the processor end of uttering long and high-pitched sounds preserves the control point that elimination is uttered long and high-pitched sounds can be used as after.
Step 103: judge whether soon to utter long and high-pitched sounds or be not in the initial stage of uttering long and high-pitched sounds according to said characteristic, this step is carried out at the processor end of uttering long and high-pitched sounds.Under normal real-time mode; The processor end of uttering long and high-pitched sounds can compare the characteristic and the said frequency point data of uttering long and high-pitched sounds of sending from the detector end of uttering long and high-pitched sounds in the certain hour, when comprising the data of the frequency point data annex of uttering long and high-pitched sounds in the said characteristic, can judge and soon utter long and high-pitched sounds; For example; The frequency of uttering long and high-pitched sounds is 1KHZ, when comprising the frequency point data of 800HZ～900HZ in the characteristic, can judge the mode of being about to and utter long and high-pitched sounds; And when comprising in the said characteristic when uttering long and high-pitched sounds frequency point data, i.e. expression has been uttered long and high-pitched sounds, and in general, utilizes method of the present invention just can be detected at the initial stage of uttering long and high-pitched sounds.In addition; Whether the frequency of vibrational waveform that the processor end of uttering long and high-pitched sounds can also calculate characteristic representative within a certain period of time is constant, whether amplitude has the trend that becomes big gradually, and when amplitude becomes big gradually and reaches certain threshold value, just expression is soon uttered long and high-pitched sounds or has been in the initial stage of uttering long and high-pitched sounds; Wherein, The primary stage of said initial stage of uttering long and high-pitched sounds for just having begun to utter long and high-pitched sounds, the process that produces of uttering long and high-pitched sounds is that amplitude becomes big gradually by little, and is less at the initial stage of uttering long and high-pitched sounds amplitude; People's ear can't be experienced howling; Just will utter long and high-pitched sounds at the initial stage of uttering long and high-pitched sounds judges and eliminates, and also can effectively avoid the user to experience and utter long and high-pitched sounds, and reaches the purpose that timely elimination is uttered long and high-pitched sounds.Loud speaker amplitude in the certain hour reaches maximum and when remaining unchanged, also expression has taken place to utter long and high-pitched sounds and when the processor end of uttering long and high-pitched sounds is judged according to said characteristic.
Step 104:, treat the preventative elimination that output sound signal is uttered long and high-pitched sounds according to the frequency point data of uttering long and high-pitched sounds that prestores when judging when soon uttering long and high-pitched sounds; When judging when being in the initial stage of uttering long and high-pitched sounds, eliminate in real time and treat the signal of uttering long and high-pitched sounds in the output sound signal.Said preventative elimination of uttering long and high-pitched sounds is meant judging and be about to produces when uttering long and high-pitched sounds, and promptly before the zero boundary point prerequisite that produces of uttering long and high-pitched sounds, eliminates the signal of uttering long and high-pitched sounds that is about to generation, plays the utter long and high-pitched sounds purpose of generation of a prevention.During practical application; Can select different processing methods to eliminate in advance or directly eliminate and utter long and high-pitched sounds according to different application requirements; Because general howling all is the sound wave of arrowband, high-amplitude; Therefore eliminate the signal of uttering long and high-pitched sounds in the said voice signal and comprise in following four kinds of modes one or more: 1) can carry out amplitude limit to the said signal or near the signal of treating to be in the output sound signal frequency of uttering long and high-pitched sounds of uttering long and high-pitched sounds, make the utter long and high-pitched sounds amplitude of signal be controlled in the amplitude range in the normal operating conditions reference data according to the frequency point data of uttering long and high-pitched sounds that debugging mode is calculated down; 2) the said signal or near the signal of treating to be in the output sound signal frequency of uttering long and high-pitched sounds of uttering long and high-pitched sounds carried out narrow-band filtering, the exploitation of uttering long and high-pitched sounds that produces according to present situation produces a narrow band digital filter, and the arrowband is carried out filtering; 3) the said signal or near the signal of treating to be in the output sound signal frequency of uttering long and high-pitched sounds of uttering long and high-pitched sounds oppositely offset, the waveform of uttering long and high-pitched sounds that the signal of judging at present of uttering long and high-pitched sounds is formed carries out reverse back cancels out each other with the former waveform of uttering long and high-pitched sounds, and eliminates fully and utters long and high-pitched sounds; 4) treat to be in the output sound signal waveform that near the signal the frequency of uttering long and high-pitched sounds or the signal of uttering long and high-pitched sounds form and carry out phase shift and handle said, arrive and suppress the purpose of uttering long and high-pitched sounds through the utter long and high-pitched sounds condition that produces of destruction.
Uttering long and high-pitched sounds of a plurality of microphones can judged and eliminate to the embodiment of the invention simultaneously; In the elimination process of uttering long and high-pitched sounds; Also can be through current vibration data with the real-time sensing of sensor assembly; And said current vibration data carried out sending to the processor end of uttering long and high-pitched sounds after the calculation process, make and utter long and high-pitched sounds whether the processor end can to analyze the cancellation of being taked of uttering long and high-pitched sounds effective.
Introduce the method for uttering long and high-pitched sounds in the embodiment of the invention and eliminating above, introduced the device of uttering long and high-pitched sounds in the embodiment of the invention and eliminating below in conjunction with Fig. 2, Fig. 3 in detail.
Referring to Fig. 2, for eliminating the structure chart of the device of uttering long and high-pitched sounds in the embodiment of the invention, said device comprises: the utter long and high-pitched sounds detection module 1 and the processing module 2 of uttering long and high-pitched sounds, wherein:
The said detection module 1 of uttering long and high-pitched sounds; Be installed on the loudspeaker horn annex; Be used for sensing loudspeaker vibration data; Under normal real-time mode, obtaining the characteristic in the certain hour and under debugging mode, to obtain the frequency point data of uttering long and high-pitched sounds in the certain hour, and said frequency point data and the said characteristic of uttering long and high-pitched sounds sent to the processing module 2 of uttering long and high-pitched sounds through wired or wireless mode.Wherein, The said frequency point data of uttering long and high-pitched sounds is that system generates under debugging mode; Under debugging mode, sensor assembly can first sensing a period of time near the vibration data the loudspeaker during system operate as normal, can the people utter long and high-pitched sounds a little then for searching out; So that the vibration data of sensor assembly loudspeaker annex when continuing that system utters long and high-pitched sounds in sensing a period of time; The vibration data of vibration data through to system's normal operating conditions time the when uttering long and high-pitched sounds analyzed computing, can calculate and collect the major part frequency of uttering long and high-pitched sounds, and the frequency of uttering long and high-pitched sounds that will collect sends in the processing module 2 of uttering long and high-pitched sounds and preserves; And said characteristic is through the sensing loud speaker vibration data within a certain period of time under normal real-time mode of the sensor unit in the detection module 1 of uttering long and high-pitched sounds, and said vibration data is carried out computing obtains.
The said processing module 2 of uttering long and high-pitched sounds; Characteristic in the certain hour that is used for being obtained according to the said detection module 1 of uttering long and high-pitched sounds judges whether soon to utter long and high-pitched sounds or be not in the initial stage of uttering long and high-pitched sounds; When judging when soon uttering long and high-pitched sounds, treat the preventative elimination that output sound signal is uttered long and high-pitched sounds according to the said frequency point data of uttering long and high-pitched sounds; When judging when being in the initial stage of uttering long and high-pitched sounds; Eliminate in real time and treat the signal of uttering long and high-pitched sounds in the output sound signal; The said processing module 2 of uttering long and high-pitched sounds can be installed between the amplifier and loudspeaker of voice output, treat that output sound signal amplifies through amplifier after, and before loudspeaker output; Eliminate in the voice signal after the said amplification utter long and high-pitched sounds signal or eliminate said amplification in advance after voice signal in the signal that is in the frequency annex of uttering long and high-pitched sounds; Prevent that soon producing signal of uttering long and high-pitched sounds or the signal that has been in the initial stage of uttering long and high-pitched sounds exports from loudspeaker, can effectively in time eliminate and utter long and high-pitched sounds, improve user experience.
Concrete, the said detection module 1 of uttering long and high-pitched sounds comprises sensor unit 11, arithmetic element 12 and transmitting element 13, wherein:
Said sensor unit 11; The vibration data that under real-time mode, is used for the sensing loud speaker, said sensor unit 11 comprises acceleration transducer and/or gyroscope, acceleration transducer directly is fixed on the loud speaker top can obtain the vibration data of loud speaker with sound variation; And gyroscope mainly be with tolerance the anglec of rotation be main; So when sensing not too possesses the loudspeaker vibration information of the anglec of rotation, need to convert vibration information to angle information, for example take lever construction with some special structures; With an end of lever near vibration source; Gyroscope is positioned over the other end of lever, and the vibration of vibration source drives lever and rotates, and vibration information promptly is convertible into angle information.
Said arithmetic element 12; Link to each other with said sensor unit 11; Be used for the vibration data within a certain period of time of said sensor unit 11 sensings is carried out computing; To obtain characteristic, said characteristic comprises one or more in frequency, amplitude and the envelope data, also can be reduced to corresponding Wave data for analysis according to its parameter.
Said transmitting element 13; Link to each other with said arithmetic element 12; The said characteristic that is used for said arithmetic element computing is obtained sends to the said processing module of uttering long and high-pitched sounds through wired or wireless mode; Since the data of said sending module 13 after the data bit calculation process that the processing module 2 of uttering long and high-pitched sounds is sent, so data volume is little, and transmission speed is fast.
In addition, under debugging mode, said sensor unit 11 also is used for sensing limber up period vibration data, the loudspeaker vibration data of the loudspeaker vibration data when said limber up period vibration data comprises system's operate as normal when uttering long and high-pitched sounds; Said arithmetic element 12 also is used for the vibration data in the certain hour in limber up period that said sensor unit 11 senses is carried out computing, to obtain the frequency point data of uttering long and high-pitched sounds; Said transmitting element 13 is used for that also the frequency point data of uttering long and high-pitched sounds that said arithmetic element 12 computings obtain is sent to the said processor module 2 of uttering long and high-pitched sounds and preserves.Concrete; Wherein, under debugging mode, sensor unit 11 can first sensing a period of time near the vibration data the loudspeaker during system operate as normal; Can the people utter long and high-pitched sounds a little then for searching out; So that the vibration data of sensor unit 11 loudspeaker annex when continuing that system utters long and high-pitched sounds in sensing a period of times, the vibration data of the vibration data during through 12 pairs of systems of arithmetic element normal operating conditions when uttering long and high-pitched sounds analyzed computing, can calculate and collect the major part frequency of uttering long and high-pitched sounds; The frequency of uttering long and high-pitched sounds that said generating unit 13 is collected said arithmetic element 12 sends to after the processing module 2 of uttering long and high-pitched sounds preserves, and eliminates the control point of uttering long and high-pitched sounds after can be used as.
Concrete, the said processing module 2 of uttering long and high-pitched sounds comprises:
Receiving element 21 is used to receive from the characteristic of the said detection module 1 of uttering long and high-pitched sounds and the frequency point data of uttering long and high-pitched sounds;
Judging unit 23, the characteristic that receives according to said receiving element 21 judges whether soon to utter long and high-pitched sounds or be not in the initial stage of uttering long and high-pitched sounds; Said judging unit 23 compares the characteristic and the said frequency point data of uttering long and high-pitched sounds of sending from the detection module 1 of uttering long and high-pitched sounds in the certain hour; When comprising the data of the frequency point data annex of uttering long and high-pitched sounds in the said characteristic; Can judge and soon utter long and high-pitched sounds, for example, the frequency of uttering long and high-pitched sounds is 1KHZ; When comprising the frequency point data of 800HZ～900HZ in the characteristic, can judge the mode of being about to and utter long and high-pitched sounds; And when comprising in the said characteristic when uttering long and high-pitched sounds frequency point data, i.e. expression has been uttered long and high-pitched sounds, and in general, utilizes method of the present invention just can be detected at the initial stage of uttering long and high-pitched sounds.In addition; Whether the frequency of vibrational waveform that the processor end of uttering long and high-pitched sounds can also calculate characteristic representative within a certain period of time is constant, whether amplitude has the trend that becomes big gradually, and when amplitude becomes big gradually and reaches certain threshold value, just expression is soon uttered long and high-pitched sounds or has been in the initial stage of uttering long and high-pitched sounds; Wherein, The primary stage of said initial stage of uttering long and high-pitched sounds for just having begun to utter long and high-pitched sounds, what utter long and high-pitched sounds is that frequency becomes big gradually fast by little, is in lower frequency range in the initial stage of uttering long and high-pitched sounds frequency; People's ear can't be experienced howling; Just will utter long and high-pitched sounds at the initial stage of uttering long and high-pitched sounds judges and eliminates, and also can effectively avoid the user to experience and utter long and high-pitched sounds, and arrives in time to eliminate the purpose of uttering long and high-pitched sounds.Processing unit 24 links to each other with judging unit 23 with said memory cell 22 respectively, is used for when said judging unit 23 judgements will soon be uttered long and high-pitched sounds, treating the preventative elimination that output sound signal is uttered long and high-pitched sounds according to the frequency point data of uttering long and high-pitched sounds that prestores in the memory cell 22; Or be used in said judgment unit judges source when initial stage of uttering long and high-pitched sounds, eliminating in real time and treating the signal of uttering long and high-pitched sounds in the output sound signal.
When practical application, processing unit 24 can be according to different application requirements, and the self-excitation of the mode cancellation microphone through amplitude limit, phase shift, narrow-band filtering, blocking-up, change, minimizing positive feedback path or energy is uttered long and high-pitched sounds.Therefore, of Fig. 3, said processing unit 24 can comprise one or more in amplitude limit unit 241, narrow-band filtering unit 242, reverse offset unit 244 and the phase-shifting unit 243.Wherein, Said amplitude limit unit 241 is used for according to the said frequency point data of uttering long and high-pitched sounds when soon uttering long and high-pitched sounds; Saidly treat to be in the output sound signal near the signal of uttering long and high-pitched sounds the frequency and carry out amplitude limit; Or the signal of uttering long and high-pitched sounds that is used for when uttering long and high-pitched sounds the initial stage carries out amplitude limit, makes the utter long and high-pitched sounds amplitude of signal be controlled in the amplitude range in the normal operating conditions reference data; Said narrow-band filtering unit 242 is used near the signal that said when soon uttering long and high-pitched sounds treat that output sound signal is in the frequency of uttering long and high-pitched sounds and carries out narrow-band filtering; Or the signal of uttering long and high-pitched sounds when uttering long and high-pitched sounds the initial stage carries out narrow-band filtering; Be specially the narrow band digital filter of waveform generation of uttering long and high-pitched sounds that produces according to present situation, the arrowband is carried out filtering; Said reverse offset unit 244 is used near the signal that said when soon uttering long and high-pitched sounds treat that output sound signal is in the frequency of uttering long and high-pitched sounds and oppositely offsets; Or the signal of uttering long and high-pitched sounds when uttering long and high-pitched sounds the initial stage is oppositely offset; The waveform of uttering long and high-pitched sounds that the signal of judging at present of uttering long and high-pitched sounds is formed carries out reverse back cancels out each other with the former waveform of uttering long and high-pitched sounds, and eliminates fully and utters long and high-pitched sounds; Said when said phase-shifting unit 243 is used for soon uttering long and high-pitched sounds treats that output sound signal is in waveform that near the signal the frequency of uttering long and high-pitched sounds forms and carries out phase shift and handle; Or the waveform that forms of the signal of uttering long and high-pitched sounds when uttering long and high-pitched sounds the initial stage carries out phase shift and handles, and arrives and suppresses the purpose of uttering long and high-pitched sounds through the utter long and high-pitched sounds condition that produces of destruction.
The cancellation element of uttering long and high-pitched sounds of the embodiment of the invention can offer a plurality of microphones simultaneously and use; To reach the purpose of uttering long and high-pitched sounds of eliminating a plurality of microphones simultaneously; And in the elimination process of uttering long and high-pitched sounds; Also can after arithmetic element 12 is handled, send to the processing module 2 of uttering long and high-pitched sounds through the current vibration data with sensor unit 11 real-time sensings, whether the feasible processing module 2 of uttering long and high-pitched sounds can be analyzed the cancellation of being taked of uttering long and high-pitched sounds effective.
The embodiment of the invention; The loudspeaker vibration data that sense through sensor assembly; Said vibration data behind data operation, can be obtained comprising the characteristic of frequency, amplitude and envelope data, said characteristic is analyzed; Not only can be used for judging and eliminating the signal of uttering long and high-pitched sounds, it can also be as the reference data of new product debugging and device upgrade.
Embodiment of the present invention embodiment is through the vibration data of sensor assembly sensing loud speaker; Said vibration data in the certain hour is carried out computing obtain characteristic, said characteristic comprises one or more in frequency, amplitude and the envelope data; Judge whether soon to utter long and high-pitched sounds or be not in the initial stage of uttering long and high-pitched sounds according to said characteristic; When judging when soon uttering long and high-pitched sounds, treat the preventative elimination that output sound signal is uttered long and high-pitched sounds according to the frequency point data of uttering long and high-pitched sounds that prestores; When judging when being in the initial stage of uttering long and high-pitched sounds, to eliminate in real time and treat the signal of uttering long and high-pitched sounds in the output sound signal, the method and apparatus that utilizes the embodiment of the invention to provide can realize the judgement and the elimination of uttering long and high-pitched sounds simply and easily, and cost is low.
Above disclosedly be merely a kind of preferred embodiment of the present invention, can not limit the present invention's interest field certainly with this, the equivalent variations of therefore doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (10)
1. the method for uttering long and high-pitched sounds and judging and eliminating is characterized in that, comprising:
Vibration data through sensor assembly sensing loud speaker;
Said vibration data in the certain hour is carried out computing obtain characteristic, said characteristic comprises one or more in frequency, amplitude and the envelope data;
Judge whether soon to utter long and high-pitched sounds or be not in the initial stage of uttering long and high-pitched sounds according to said characteristic;
When judging when soon uttering long and high-pitched sounds, treat the preventative elimination that output sound signal is uttered long and high-pitched sounds according to the frequency point data of uttering long and high-pitched sounds that prestores;
When judging when being in the initial stage of uttering long and high-pitched sounds, eliminate in real time and treat the signal of uttering long and high-pitched sounds in the output sound signal.
2. the method for claim 1 is characterized in that, before said vibration data through sensor assembly sensing loud speaker, also comprises:
Under debugging mode, sensor assembly sensing limber up period vibration data, the loudspeaker vibration data of the loudspeaker vibration data when said limber up period vibration data comprises system's operate as normal when uttering long and high-pitched sounds;
Vibration data in the certain hour in the said limber up period is carried out computing obtain characteristic, said characteristic comprises the Frequency point data, and the Frequency point data of preserving all places when taking place of uttering long and high-pitched sounds are as uttering long and high-pitched sounds frequency point data.
3. method as claimed in claim 2 is characterized in that said sensor assembly comprises acceleration transducer and/or gyroscope.
4. like each described method in claim 2 or 3, it is characterized in that:
When judging when soon uttering long and high-pitched sounds, the frequency point data of uttering long and high-pitched sounds that said basis prestores is treated the preventative elimination that output sound signal is uttered long and high-pitched sounds, and is specially:
According to the said frequency point data of uttering long and high-pitched sounds near the said signal of treating to be in the output sound signal frequency of uttering long and high-pitched sounds is carried out amplitude limit, or it is carried out narrow-band filtering, or it oppositely offsets, or it is carried out phase shift handle, the condition of uttering long and high-pitched sounds and producing with destruction;
When judging when being in the initial stage of uttering long and high-pitched sounds, the signal of uttering long and high-pitched sounds in the output sound signal is treated in said real-time elimination, is specially:
Treat that to said the signal of uttering long and high-pitched sounds in the output sound signal carries out amplitude limit according to the said frequency point data of uttering long and high-pitched sounds, or it is carried out narrow-band filtering, or it oppositely offsets, or it is carried out phase shift handle, the condition of uttering long and high-pitched sounds and producing with destruction.
5. utter long and high-pitched sounds judgement and cancellation element is characterized in that, comprising:
The detection module of uttering long and high-pitched sounds is used for sensing loudspeaker vibration data, under normal real-time mode, to obtain the characteristic in the certain hour and under debugging mode, to obtain the frequency point data of uttering long and high-pitched sounds in the certain hour;
The processing module of uttering long and high-pitched sounds; Characteristic in the certain hour that is used for obtaining according to the said detection module of uttering long and high-pitched sounds judges whether soon to utter long and high-pitched sounds or be not in the initial stage of uttering long and high-pitched sounds; When judging when soon uttering long and high-pitched sounds, treat the preventative elimination that output sound signal is uttered long and high-pitched sounds according to the said frequency point data of uttering long and high-pitched sounds; When judging when being in the initial stage of uttering long and high-pitched sounds, eliminate in real time and treat the signal of uttering long and high-pitched sounds in the output sound signal.
6. device as claimed in claim 5 is characterized in that, the said detection module of uttering long and high-pitched sounds comprises:
Sensor unit is used for the vibration data of sensing loud speaker;
Arithmetic element links to each other with said sensor unit, is used for the vibration data within a certain period of time of said sensor unit sensing is carried out computing, and to obtain characteristic, said characteristic comprises one or more in frequency, amplitude and the envelope data;
Transmitting element links to each other with said arithmetic element, is used for the said characteristic that said arithmetic element computing obtains is sent to the said processing module of uttering long and high-pitched sounds.
7. device as claimed in claim 6 is characterized in that:
Said sensor unit also is used under debugging mode, sensing limber up period vibration data, the loudspeaker vibration data of the loudspeaker vibration data when said limber up period vibration data comprises system's operate as normal when uttering long and high-pitched sounds;
Said arithmetic element also is used for the vibration data in the certain hour in limber up period that said sensor unit senses is carried out computing, to obtain the frequency point data of uttering long and high-pitched sounds;
Said transmitting element also is used for the frequency point data of uttering long and high-pitched sounds that said arithmetic element computing obtains is sent to the said processor module of uttering long and high-pitched sounds.
8. device as claimed in claim 7 is characterized in that, the said processing module of uttering long and high-pitched sounds comprises:
Receiving element is used to receive from the characteristic of the said detection module of uttering long and high-pitched sounds and the frequency point data of uttering long and high-pitched sounds;
Memory cell links to each other with said receiving element, is used to store the said frequency point data of uttering long and high-pitched sounds;
Judging unit, the characteristic that receives according to said receiving element judges whether soon to utter long and high-pitched sounds or be not in the initial stage of uttering long and high-pitched sounds;
Processing unit links to each other with judging unit with said memory cell respectively, is used for when said judgment unit judges goes out soon to utter long and high-pitched sounds, treating the preventative elimination that output sound signal is uttered long and high-pitched sounds according to the frequency point data of uttering long and high-pitched sounds that prestores; Or be used in said judgment unit judges source when initial stage of uttering long and high-pitched sounds, eliminating in real time and treating the signal of uttering long and high-pitched sounds in the output sound signal.
9. device as claimed in claim 8; It is characterized in that, said processing unit comprise to saidly treat to be in the output sound signal amplitude limit unit that near the signal the frequency of uttering long and high-pitched sounds or the signal of uttering long and high-pitched sounds carry out amplitude limit, to saidly treating to be in the output sound signal narrow-band filtering unit that near the signal the frequency of uttering long and high-pitched sounds or the signal of uttering long and high-pitched sounds carry out narrow-band filtering, treating to be in the output sound signal reverse offset unit that near the signal the frequency of uttering long and high-pitched sounds or the signal of uttering long and high-pitched sounds oppositely offset and treat to be in the output sound signal near the signal the frequency of uttering long and high-pitched sounds or the signal of uttering long and high-pitched sounds and carry out one or more in the phase-shifting unit that phase shift handles to said to said.
10. like each described device in the claim 5 to 9, it is characterized in that said sensor unit comprises acceleration transducer and/or gyroscope.
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