CN102970646A - Loudspeaker abnormal sound detection circuit device and detection method based on constant current source power amplification - Google Patents
Loudspeaker abnormal sound detection circuit device and detection method based on constant current source power amplification Download PDFInfo
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- CN102970646A CN102970646A CN2012104377296A CN201210437729A CN102970646A CN 102970646 A CN102970646 A CN 102970646A CN 2012104377296 A CN2012104377296 A CN 2012104377296A CN 201210437729 A CN201210437729 A CN 201210437729A CN 102970646 A CN102970646 A CN 102970646A
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Abstract
The invention discloses a loudspeaker abnormal sound detection circuit device based on constant current source power amplification. The loudspeaker abnormal sound detection circuit device comprises a high-precision amplitude-adjustable sinusoidal signal generator module, a constant current source power amplification module, an abnormal sound extraction detection module and a base frequency signal analysis feedback module. The invention further relates to a detection method of the detection circuit device. The detection method comprises a first step of providing high-precision and amplitude-adjustable excitation signals through the high-precision amplitude-adjustable sinusoidal signal generator module, a second step of extracting response signals of a loudspeaker from high-precision continuous swept-frequency signals, converting the swept-frequency signals into digital signals, analyzing a base frequency signal frequency spectrum, and feeding a base frequency signal amplitude value back to a signal source to perform amplitude value compensation, and a third step of judging whether abnormal sounds occur in the loudspeaker. According to the loudspeaker abnormal sound detection circuit device and detection method based on constant current source power amplification, a system structure is simple, the environmental noise is not introduced, and whether the abnormal sounds occur in the loudspeaker can be accurately detected.
Description
Technical field
The invention belongs to electroacoustic detection technique field, relate to the unusual sound detecting circuit device of a kind of loud speaker based on the constant-current source power amplifier, the invention still further relates to the detection method of above-mentioned testing circuit device.
Background technology
Since loud speaker research and development are unreasonable and in batch production process some unforeseen situations, cause loud speaker when excitation normal audio signal, can have abnormal sound, these abnormal sounds can have influence on people's auditory perception.
The testing of abnormal sound appears for loud speaker, traditional method is to utilize people's ear to remove to distinguish abnormal sound, and this way exists a large amount of subjective factors, can affect production efficiency and the product quality of loud speaker, therefore, the detection for the unusual sound of loud speaker has profound significance.
At present, drive loud speaker for the most of fixed voltage modes that adopt of the detection of the unusual sound of loud speaker, this detection method is overcoming on nonlinear distortion and the transient distortion and can't take into account.Because the load loud speaker that power amplifier drives is neither resistive load, neither the pure inductance load, the electric current I on the loudspeaker voice coil
0With power amplifier output end voltage V
0There is certain phase difference, makes negative feedback voltage V
fWith the voice coil loudspeaker voice coil electric current I
0Not linear relationship, cause transient intermodulation.And the constant pressure source power amplifier measures the unusual sound of loud speaker, after need to place Sound Attenuator and microphone, by analyzing the sound pressure signal of microphone, judge the performance of loud speaker, this detection system complex structure can be introduced ambient noise, and the result is caused interference.
Summary of the invention
The object of the present invention is to provide the unusual sound detecting circuit of a kind of loud speaker based on the constant-current source power amplifier and detection method, adopt the constant-current source power amplifier to replace the constant pressure source power amplifier, utilize constant-current characteristics and the infinitely-great characteristic of internal resistance of constant-current source, by measuring the signal of telecommunication at loud speaker two ends, reach the purpose of the unusual sound detection of loud speaker; Simultaneously, the amplitude of fundamental frequency signal is fed back to signal generating module, carry out Amplitude Compensation, make the loud speaker both end voltage constant, satisfy the condition that constant pressure source is measured the unusual sound of loud speaker.
The technical solution adopted in the present invention is, based on the unusual sound detecting circuit device of the loud speaker of constant-current source power amplifier, include adjustable sinusoidal signal generator module, constant-current source power amplifier module, the abnormal sound of high accuracy amplitude that connects by wire and extract detection module and fundamental frequency signal analysis feedback module.
Characteristics of the present invention also are,
The sinusoidal signal generator module includes signal source generator, programmable attenuator, control tape bandpass filter, and signal source generator is connected with programmable attenuator, control tape bandpass filter respectively by wire.
The constant-current source power amplifier module includes constant-current power amplifier and differential amplifier circuit, and constant-current power amplifier is connected with differential amplifier circuit by wire, also is provided with the wire that connects loud speaker on the constant-current power amplifier.
Abnormal sound extracts detection module and includes program control band stop filter and the single-ended amplifier that connects successively by wire, and single-ended amplifier is connected by wire and analysis of spectrum module and with the playback module of loudspeaker arrangement respectively.
Fundamental frequency signal is analyzed feedback module and is included by wire link together DSP module and A/D converter.
Control tape bandpass filter in the sinusoidal signal generator module is connected with constant-current power amplifier in the constant-current source power amplifier module by wire, differential amplifier circuit in the constant-current source power amplifier module is connected with the program control band stop filter in abnormal sound extracts detection module, the A/D converter that fundamental frequency signal is analyzed in the feedback module respectively by wire, and the program control band stop filter that abnormal sound extracts in the detection module is connected with DSP module, the programmable attenuator in the sinusoidal signal generator module in the fundamental frequency signal analysis feedback module successively by wire.
Another technical scheme of the present invention is based on the detection method of the unusual sound detecting circuit device of the loud speaker of constant-current source power amplifier, specifically to implement according to following steps:
Step 1, provide high accuracy and the adjustable pumping signal of amplitude by the adjustable sinusoidal signal generator module of high accuracy amplitude;
Continuous swept-frequency signal occurs in the signal source generator in the sinusoidal signal generator module that the high accuracy amplitude is adjustable, utilizes programmable attenuator that continuous swept-frequency signal is decayed, and the frequency range of continuous swept-frequency signal is controlled;
Step 3, judge whether loud speaker exists unusual sound.
The characteristics of another technical scheme of the present invention also are,
Step 1 is specifically implemented according to following steps:
1) loud speaker to be measured is connected between constant-current source power amplifier and the differential amplifier circuit by wire, connect circuit, startup is based on the unusual sound detecting circuit of the loud speaker of constant-current source power amplifier, continuous swept-frequency signal occurs by signal source generator, programmable attenuator is decayed the spectral magnitude of continuous swept-frequency signal, obtains can not produce the continuous swept-frequency signal of distortion;
2) through 1) process after, swept-frequency signal is adjusted by the control tape bandpass filter continuously, the control tape bandpass filter is according to the predefined parameter of user: centre frequency and cut-off frequecy of passband carry out filtering to continuous swept-frequency signal, composition beyond the filtering fundamental frequency signal frequency, improve the precision of continuous swept-frequency signal, obtain fundamental frequency signal.
1) with the fundamental frequency signal input constant-current source power amplifier module that obtains in the step 1, the fundamental frequency signal that constant-current power amplifier in the constant-current source power amplifier module obtains step 1 carries out power amplification and is carried in the loud speaker two ends to be measured that connect in the step 1, the fundamental frequency signal of processing through constant-current power amplifier drives the loud speaker sounding, makes simultaneously loud speaker two ends to be measured produce the electroresponse signal;
2) with 1) in the electroresponse signal at loud speaker two ends send into differential amplifier circuit, differential amplifier circuit amplifies difference mode signal, suppresses common mode noise signal, is not contained the loud speaker electroresponse signal of outside noise.
Step 3 is specifically implemented according to following steps:
1) the loud speaker electroresponse signal that is not contained outside noise in the step 2 is carried out analog-to-digital conversion through A/D converter, the loud speaker electroresponse signal transition that does not contain outside noise is discrete digital signal, by the DSP module discrete digital signal is processed again, the part signal identical with fundamental frequency signal in the step 1 in the discrete digital signal carried out spectrum analysis, the DSP module feeds back to signal source generator with the amplitude of fundamental frequency signal frequency spectrum simultaneously, and signal source generator carries out amplitude compensation to fundamental frequency signal;
DSP module control signal source generator, programmable attenuator, control tape bandpass filter, the operation of program control band stop filter modules Frequency Synchronization, the loud speaker electroresponse signal that does not contain outside noise that obtains through step 2 is admitted to program control band stop filter, frequency range according to fundamental frequency signal, set the cut-off frequency of program control band stop filter, with the incoherent signal of fundamental frequency signal, obtain voice signal to be detected in the filtering electroresponse signal in loud speaker two ends to be detected;
2) will be through 1) voice signal to be detected that obtains is delivered to single-ended amplifier, by single-ended amplifier voice signal to be detected amplified;
3) voice signal to be detected after amplifying is delivered to respectively the analysis of spectrum module and with the playback module of loudspeaker arrangement, the analysis of spectrum module is extracted the voice signal to be detected after amplifying, adopt Fourier transform, convert the voice signal to be detected after amplifying to frequency spectrum, if the frequency spectrum of gained is disorderly and unsystematic, and energy surpasses predefined threshold value, illustrates that voice signal to be detected is the abnormal sound signal;
Wherein predefined threshold value is to measure by experiment, there is not determined value, specifically obtaining method is: get 100 normal loud speakers, by measuring, the upper threshold of statistics and definite good loud speaker is got 100 fault loud speakers again, by measuring, the lower limit of definite threshold, what obtain has determined a threshold range according to upper threshold and threshold value lower limit, determines a threshold value according to the requirement of institute's detection loud speaker in threshold range;
Voice signal to be detected after amplifying simultaneously plays back by the playback module with loudspeaker arrangement, if hear the sound of non-pumping signal, illustrates that then there is abnormal sound in loud speaker to be detected;
Namely the voice signal frequency spectrum after amplifying is disorderly and unsystematic and can play out sound with the playback module of loudspeaker arrangement and judge that there is abnormal sound in loud speaker; Otherwise there is not abnormal sound.
Beneficial effect of the present invention is,
1) because the infinitely-great characteristic of constant current, internal resistance of constant-current source power amplifier makes the weak voltage fluctuation at loud speaker two ends be easy to detect, is unlikely to be flooded by circuit, improved the reliability of different sound testing result.
2) voltage signal at the inventive method direct-detection loud speaker two ends does not need in the test circuit devices such as Sound Attenuator, microphone are set, so that circuit structure is simple, can introduce ambient noise and avoid unnecessary interference, and measurement result is accurate.
3) testing circuit abnormal sound process spectrum analysis and two kinds of processing methods of loud speaker playback to extracting judge that comprehensively whether loud speaker contains abnormal sound, has guaranteed the accuracy of measurement result.
4) method of testing is based on the constant-current source power amplifier, and the transient intermodulation of avoiding the constant voltage power amplifier to bring makes measurement result more accurate.
Description of drawings
Fig. 1 is the schematic diagram that the present invention is based on the unusual sound detection device of loud speaker of constant-current source power amplifier;
Among the figure, 1. signal source generator, 2. programmable attenuator, 3. control tape bandpass filter, 4. constant-current source power amplifier, 5. differential amplifier circuit, 6. program control band stop filter, 7. single-ended amplifier, 8. analysis of spectrum module, 9. with the playback module of loudspeaker arrangement, 10.DSP module, 11.A/D transducer.
Embodiment
The present invention is described in detail below in conjunction with accompanying drawing and specific implementation method.
The present invention is based on the unusual sound detecting circuit device of loud speaker of constant-current source power amplifier, its structure includes adjustable sinusoidal signal generator module, constant-current source power amplifier module, the abnormal sound of high accuracy amplitude that connects by wire and extracts detection module and fundamental frequency signal analysis feedback module as shown in Figure 1.
Adjustable sinusoidal signal generator module includes signal source generator 1, programmable attenuator 2, control tape bandpass filter 3, and signal source generator 1 is connected with programmable attenuator 2, control tape bandpass filter 3 respectively by wire.
The constant-current source power amplifier module includes constant-current power amplifier 4 and differential amplifier circuit 5, and constant-current power amplifier 4 is connected with differential amplifier circuit 5 by wire, also is provided with the wire that connects loud speaker on the constant-current power amplifier 4.
Abnormal sound extracts detection module and includes program control band stop filter 6 and the single-ended amplifier 7 that connects successively by wire, and single-ended amplifier 7 is connected by wire and analysis of spectrum module 8 and with the playback module 9 of loudspeaker arrangement respectively.
Fundamental frequency signal is analyzed feedback module and is included by wire link together DSP module 10 and A/D converter 11.
Control tape bandpass filter 3 in the sinusoidal signal generator module is connected with constant-current power amplifier 4 in the constant-current source power amplifier module by wire, differential amplifier circuit 5 in the constant-current source power amplifier module is connected with the program control band stop filter 6 in abnormal sound extracts detection module, the A/D converter 11 that fundamental frequency signal is analyzed in the feedback module respectively by wire, and the program control band stop filter 6 that abnormal sound extracts in the detection module is connected with DSP module 10, the programmable attenuator 2 in the sinusoidal signal generator module in the fundamental frequency signal analysis feedback module successively by wire.
The chip of signal source generator 1 adopts integrated chip or utilizes special-purpose Direct Digital Synthesis-DDS chip; Programmable attenuator 2 is program control type, according to the amplitude of the continuous swept-frequency signal of difference, by the parameter of user's free setting attenuator, continuous swept-frequency signal amplitude is decayed, and reaches the purpose that prevents continuous swept-frequency signal distortion; Control tape bandpass filter 3 is program control type, can by the parameter of user's free setting filter, only allow fundamental frequency signal pass through according to the frequency range of continuous swept-frequency signal, reaches the purpose that improves continuous swept-frequency signal precision.
The present invention is based on the unusual sound detection method of loud speaker of constant-current source power amplifier, its testing circuit is specifically implemented as shown in Figure 1 in such a way:
Step 1, provide high accuracy and the adjustable pumping signal of amplitude by the adjustable sinusoidal signal generator module of high accuracy amplitude;
Continuous swept-frequency signal occurs in the signal source generator 1 in the sinusoidal signal generator module that the high accuracy amplitude is adjustable, utilizes 2 pairs of continuous swept-frequency signals of programmable attenuator to decay, and by program control band stop filter 3 frequency range of continuous swept-frequency signal is controlled;
1) loud speaker to be measured is connected between constant-current source power amplifier 4 and the differential amplifier circuit 5 by wire, connect circuit, startup is based on the unusual sound detecting circuit of the loud speaker of constant-current source power amplifier, continuous swept-frequency signal occurs by signal source generator 1, programmable attenuator 2 is decayed the spectral magnitude of continuous swept-frequency signal, obtain not produce the continuous swept-frequency signal of distortion, too high to prevent continuous swept-frequency signal level, produce nonlinear distortion;
2) through 1) process after, swept-frequency signal is adjusted by control tape bandpass filter 3 continuously, control tape bandpass filter 3 is according to the predefined parameter of user: centre frequency and cut-off frequecy of passband carry out filtering to continuous swept-frequency signal, composition beyond the filtering fundamental frequency signal frequency, improve the precision of continuous swept-frequency signal, obtain fundamental frequency signal.
1) with the fundamental frequency signal input constant-current source power amplifier module that obtains in the step 1, the fundamental frequency signal that 4 pairs of steps 1 of constant-current power amplifier in the constant-current source power amplifier module obtain carries out power amplification and is carried in the loud speaker two ends to be measured that connect in the step 1, the fundamental frequency signal of processing through constant-current power amplifier 4 drives the loud speaker sounding, makes simultaneously loud speaker two ends to be measured produce the electroresponse signal;
Constant-current power amplifier 4 utilizes constant-current source current constant and the infinitely-great characteristic of internal resistance, and circuit can capture the electroresponse signal at loud speaker two ends observantly, makes measurement result that very high accuracy be arranged;
2) with 1) in the electroresponse signal at loud speaker two ends send into differential amplifier circuit 5, differential amplifier circuit 5 amplifies difference mode signal, suppress common mode noise signal, the loud speaker electroresponse signal that is not contained outside noise can reduce the noise that caused by external environment like this to the interference of loud speaker two ends electroresponse signal.
Step 3, judge whether loud speaker exists unusual sound;
1) the loud speaker electroresponse signal that is not contained outside noise in the step 2 is carried out analog-to-digital conversion through A/D converter 11, the loud speaker electroresponse signal transition that does not contain outside noise is discrete digital signal, process by 10 pairs of discrete digital signals of DSP module again, the part signal identical with fundamental frequency signal in the step 1 in the discrete digital signal carried out spectrum analysis, DSP module 10 amplitudes with the fundamental frequency signal frequency spectrum feed back to signal source generator 1 simultaneously, and 1 pair of fundamental frequency signal of signal source generator carries out amplitude compensation;
2) will be through 1) voice signal to be detected that obtains is delivered to single-ended amplifier 7, by single-ended amplifier 7 voice signal to be detected amplified;
3) voice signal to be detected after amplifying is delivered to respectively analysis of spectrum module 8 and with the playback module 9 of loudspeaker arrangement, the voice signal to be detected that analysis of spectrum module 8 is extracted after amplifying, adopt Fourier transform, convert the voice signal to be detected after amplifying to frequency spectrum, if the frequency spectrum of gained is disorderly and unsystematic, and energy surpasses predefined threshold value, illustrates that voice signal to be detected is the abnormal sound signal;
Wherein predefined threshold value is to measure by experiment, there is not determined value, specifically obtaining method is: get 100 normal loud speakers, by measuring, the upper threshold of statistics and definite good loud speaker is got 100 fault loud speakers again, by measuring, the lower limit of definite threshold, what obtain has determined a threshold range according to upper threshold and threshold value lower limit, determines a threshold value according to the requirement of institute's detection loud speaker in threshold range; Producer can select a numerical value according to the technological requirement of producing loud speaker in this threshold interval, general high-grade product, and threshold value will be hanged down; And low-grade product, threshold value is higher.
Voice signal to be detected after amplifying simultaneously plays back by the playback module 9 with loudspeaker arrangement, if hear the sound of non-pumping signal, illustrates that then there is abnormal sound in loud speaker to be detected;
Voice signal frequency spectrum after amplifying is disorderly and unsystematic and can play out sound with the playback module 9 of loudspeaker arrangement and judge that there is abnormal sound in loud speaker; Otherwise there is not abnormal sound.
The unusual sound detection device of loud speaker that the present invention is based on the constant-current source power amplifier is divided into four module: sinusoidal signal generator module that the high accuracy amplitude is adjustable, constant-current source power amplifier module, abnormal sound extract detection module, fundamental frequency signal is analyzed feedback module; The adjustable sinusoidal signal generator of high accuracy amplitude provides high accuracy and the adjustable continuous swept-frequency signal of amplitude, be loaded on the loud speaker to be measured by the constant-current source power amplifier module, abnormal sound extracts detection module and detects loud speaker both end voltage signal, extract the abnormal sound part, fundamental frequency signal is analyzed feedback module the fundamental frequency signal amplitude is fed back to signal source generator 1, make loud speaker both end voltage to be measured constant, satisfy simultaneously the constant voltage power amplifier and measure the abnormal sound condition.
Sinusoidal signal generator module that the high accuracy amplitude is adjustable, send continuous swept-frequency signal by signal source generator 1,2 pairs of continuous swept-frequency signals of programmable attenuator are carried out amplitude fading, control tape bandpass filter 3 carries out frequency range control, frequency content beyond the filtering fundamental frequency signal improves the precision of continuous swept-frequency signal; The chip of signal source generator 1 adopts integrated chip or utilizes special-purpose Direct Digital Synthesis-DDS chip; Programmable attenuator 2 is designed to program control type, according to the amplitude of the continuous swept-frequency signal of difference, by the parameter of user's free setting attenuator, continuous swept-frequency signal amplitude is decayed, and reaches the purpose that prevents continuous swept-frequency signal distortion; Control tape bandpass filter 3 is designed to program control type, can by the parameter of user's free setting filter, only allow fundamental frequency signal pass through according to the frequency range of continuous swept-frequency signal, reaches the purpose that improves continuous swept-frequency signal precision.
The constant-current source power amplifier module with continuous swept-frequency signal power amplification and be carried on the loud speaker to be measured, detects the voltage signal at loud speaker two ends with constant-current source power amplifier 4, voltage signal is carried out differential amplification by differential amplifier circuit 5 process; Constant-current source power amplifier 4 wherein utilizes the constant-current source current constant, and the infinitely-great characteristic of internal resistance can be measured the voltage signal at loud speaker two ends observantly, makes measurement result that very high accuracy be arranged; Differential amplifier circuit 5 plays the amplification difference mode signal, suppresses common-mode noise, reduces the effect that noise that environment causes disturbs the loudspeaker response signal.
Abnormal sound extracts detection module, with fundamental component in the program control band stop filter 6 filtering loudspeaker response signals of telecommunication, extract abnormal sound, after the gained abnormal sound amplifies by single-ended amplifier 7, simultaneously through analysis of spectrum module 8, with the processing of the playback module 9 of loudspeaker arrangement, judge comprehensively by the two-way result whether loud speaker to be measured contains abnormal sound; Program control band stop filter 6 is program control type, can be according to the frequency range of continuous swept-frequency signal, by the parameter of user's free setting filter, reach in the just filtering loud speaker electroresponse continuously the purpose of frequency content corresponding to swept-frequency signal, and extract abnormal sound; Analysis of spectrum module 8 adopts Fourier transform, converts the voice signal that extracts to frequency spectrum, by the observation frequency spectrum, judges to have or not abnormal sound; , with a normal loudspeaker arrangement voice signal that extracts is play by normal loud speaker with the playback module 9 of loudspeaker arrangement, judged to have or not abnormal sound.
Fundamental frequency signal is analyzed feedback module, it is digital signal by analog signal conversion that A/D converter 11 is sent in the output of differential amplifier circuit 5, the gained digital signal is sent in the DSP module 10, fundamental frequency signal is carried out analysis of spectrum to be processed, and the amplitude of fundamental frequency signal fed back to signal source generator 1, carry out amplitude compensation, make the voltage constant at loud speaker two ends, satisfy the terms and conditions that the constant voltage power amplifier detects abnormal sound; DSP module 10 also has the effect of control signal source generator 1, programmable attenuator 2, control tape bandpass filter 3, program control band stop filter 6 modules Frequency Synchronization simultaneously.
Traditional constant pressure source mensuration can because the nonlinear impedance of loud speaker causes transient intermodulation, affect measurement result.The constant pressure source method of measurement needs to detect by microphone the performance of loud speaker, and the introducing meeting of microphone brings interference to circuit, so this method is not suitable for the detection of the unusual sound of loud speaker.
The present invention is based on constant flow method, flow through the current feedback of loudspeaker voice coil to the input of constant-current source power amplifier with the linear resistive element handle, make the constant-current source power amplifier drive the loud speaker of load in the fixed current mode, make feedback loop signals linear with flowing through the loudspeaker voice coil electric current, so just avoided constant-voltage method because the transient intermodulation that the loud speaker nonlinear impedance is brought.Because constant-current characteristics and the infinitely-great characteristic of internal resistance of constant-current source even make the faint voltage fluctuation in loud speaker two ends also be easy to catch, are unlikely to be flooded by circuit, have improved the reliability of measuring.In view of the above characteristic of constant-current source power amplifier, can judge speaker performance by the voltage signal that detects the loud speaker two ends, save the devices such as Sound Attenuator, microphone, avoid too much interference.
The present invention has adopted succinctly, method judges whether loud speaker contains abnormal sound accurately, by measuring the signal of telecommunication at loud speaker two ends, the gained signal of telecommunication is carried out doing respectively analysis of spectrum and loud speaker audition after difference, amplification, filtering process, judge comprehensively whether loud speaker contains abnormal sound.
Claims (10)
1. based on the unusual sound detecting circuit device of the loud speaker of constant-current source power amplifier, it is characterized in that, include adjustable sinusoidal signal generator module, constant-current source power amplifier module, the abnormal sound of high accuracy amplitude that connects by wire and extract detection module and fundamental frequency signal analysis feedback module.
2. the unusual sound detecting circuit device of the loud speaker based on the constant-current source power amplifier according to claim 1, it is characterized in that, described sinusoidal signal generator module includes signal source generator (1), programmable attenuator (2), control tape bandpass filter (3), and described signal source generator (1) is connected with described programmable attenuator (2), described control tape bandpass filter (3) respectively by wire.
3. the unusual sound detecting circuit device of the loud speaker based on the constant-current source power amplifier according to claim 1, it is characterized in that, described constant-current source power amplifier module includes power amplifier (4) and differential amplifier circuit (5), described constant-current source power amplifier (4) is connected with described differential amplifier circuit (5) by wire, also is provided with the wire that connects loud speaker on the described constant-current source power amplifier (4).
4. the unusual sound detecting circuit device of the loud speaker based on the constant-current source power amplifier according to claim 1, it is characterized in that, described abnormal sound extracts detection module and includes program control band stop filter (6) and the single-ended amplifier (7) that connects successively by wire, and described single-ended amplifier (7) is connected by wire and analysis of spectrum module (8) and with the playback module (9) of loudspeaker arrangement respectively.
5. the unusual sound detecting circuit device of the loud speaker based on the constant-current source power amplifier according to claim 1 is characterized in that, described fundamental frequency signal is analyzed feedback module and included by wire link together DSP module (10) and A/D converter (11).
6. the unusual sound detecting circuit device of described loud speaker based on the constant-current source power amplifier according to claim 1 ~ 5, it is characterized in that, control tape bandpass filter (3) in the described sinusoidal signal generator module is connected with constant-current source power amplifier (4) in the described constant-current source power amplifier module by wire, differential amplifier circuit (5) in the described constant-current source power amplifier module extracts program control band stop filter (6) in the detection module with described abnormal sound respectively by wire, the A/D converter (11) that fundamental frequency signal is analyzed in the feedback module connects, and the program control band stop filter (6) that described abnormal sound extracts in the detection module is analyzed DSP module (10) in the feedback module with described fundamental frequency signal successively by wire, programmable attenuator (2) in the described sinusoidal signal generator module connects.
7. based on the detection method of the unusual sound detecting circuit device of the loud speaker of constant-current source power amplifier, it is characterized in that, specifically implement according to following steps:
Step 1, provide high accuracy and the adjustable pumping signal of amplitude by the adjustable sinusoidal signal generator module of high accuracy amplitude;
Continuous swept-frequency signal occurs in the signal source generator (1) in the sinusoidal signal generator module that the high accuracy amplitude is adjustable, utilizes programmable attenuator that continuous swept-frequency signal is decayed, and the frequency range of continuous swept-frequency signal is controlled;
Step 2, drive loud speaker with current constant mode and produce the electroresponse signal, and the electroresponse signal is converted to digital signal, the analyzing fundamental frequency signal spectrum feeds back to signal source generator with the fundamental frequency signal amplitude and carries out amplitude compensation;
Step 3, judge whether loud speaker exists unusual sound.
8. the method for the unusual sound detecting circuit device of the loud speaker based on the constant-current source power amplifier according to claim 7 is characterized in that described step 1 is specifically implemented according to following steps:
1) loud speaker to be measured is connected between constant-current source power amplifier (4) and the differential amplifier circuit (5) by wire, connect circuit, startup is based on the unusual sound detecting circuit of the loud speaker of constant-current source power amplifier, continuous swept-frequency signal occurs by signal source generator (1), programmable attenuator (2) is decayed the spectral magnitude of continuous swept-frequency signal, obtains can not produce the continuous swept-frequency signal of distortion;
2) through 1) process after, swept-frequency signal is adjusted by control tape bandpass filter (3) continuously, control tape bandpass filter (3) is according to the predefined parameter of user: centre frequency and cut-off frequecy of passband carry out filtering to continuous swept-frequency signal, composition beyond the filtering fundamental frequency signal frequency, improve the precision of continuous swept-frequency signal, obtain fundamental frequency signal.
9. the method for the unusual sound detecting circuit device of the loud speaker based on the constant-current source power amplifier according to claim 7 is characterized in that described step 2 is specifically implemented according to following steps:
1) with the fundamental frequency signal input constant-current source power amplifier module that obtains in the step 1, the fundamental frequency signal that constant-current power amplifier (4) in the constant-current source power amplifier module obtains step 1 carries out power amplification and is carried in the loud speaker two ends to be measured that connect in the step 1, the fundamental frequency signal of processing through constant-current power amplifier (4) drives the loud speaker sounding, makes simultaneously loud speaker two ends to be measured produce the electroresponse signal;
2) with 1) in the electroresponse signal at loud speaker two ends send into differential amplifier circuit (5), differential amplifier circuit (5) amplifies difference mode signal, suppresses common mode noise signal, is not contained the loud speaker electroresponse signal of outside noise.
10. the method for the unusual sound detecting circuit device of the loud speaker based on the constant-current source power amplifier according to claim 7 is characterized in that described step 3 is specifically implemented according to following steps:
1) the loud speaker electroresponse signal that is not contained outside noise in the step 2 is carried out analog-to-digital conversion through A/D converter (11), the loud speaker electroresponse signal transition that does not contain outside noise is discrete digital signal, by DSP module (10) discrete digital signal is processed again, the part signal identical with fundamental frequency signal in the step 1 in the discrete digital signal carried out spectrum analysis, DSP module (10) feeds back to signal source generator (1) with the amplitude of fundamental frequency signal frequency spectrum simultaneously, and signal source generator (1) carries out amplitude compensation to fundamental frequency signal;
DSP module (10) control signal source generator (1), programmable attenuator (2), control tape bandpass filter (3), the operation of program control band stop filter (6) modules Frequency Synchronization, the loud speaker electroresponse signal that does not contain outside noise that obtains through step 2 is admitted to program control band stop filter (6), frequency range according to fundamental frequency signal, set the cut-off frequency of program control band stop filter (6), with the incoherent signal of fundamental frequency signal, obtain voice signal to be detected in the filtering electroresponse signal in loud speaker two ends to be detected;
2) will be through 1) voice signal to be detected that obtains is delivered to single-ended amplifier (7), by single-ended amplifier (7) voice signal to be detected amplified;
3) voice signal to be detected after amplifying is delivered to respectively analysis of spectrum module (8) and with the playback module (9) of loudspeaker arrangement, analysis of spectrum module (8) is extracted the voice signal to be detected after amplifying, adopt Fourier transform, convert the voice signal to be detected after amplifying to frequency spectrum, if the frequency spectrum of gained is disorderly and unsystematic, and energy surpasses predefined threshold value, illustrates that voice signal to be detected is the abnormal sound signal;
Wherein predefined threshold value is to measure by experiment, there is not determined value, specifically obtaining method is: get 100 normal loud speakers, by measuring, the upper threshold of statistics and definite good loud speaker is got 100 fault loud speakers again, by measuring, the lower limit of definite threshold, what obtain has determined a threshold range according to upper threshold and threshold value lower limit, determines a threshold value according to the requirement of institute's detection loud speaker in threshold range;
Voice signal to be detected after amplifying simultaneously plays back by the playback module (9) with loudspeaker arrangement, if hear the sound of non-pumping signal, illustrates that then there is abnormal sound in loud speaker to be detected;
Namely the voice signal frequency spectrum after amplifying is disorderly and unsystematic and can play out sound with the playback module (9) of loudspeaker arrangement and judge that there is abnormal sound in loud speaker; Otherwise there is not abnormal sound.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103888884A (en) * | 2014-04-03 | 2014-06-25 | 联想(北京)有限公司 | Loudspeaker detecting method and device |
| CN104168532A (en) * | 2013-05-15 | 2014-11-26 | 光宝光电(常州)有限公司 | Method and apparatus for abnormal noise detection of loudspeaker |
| CN105163262A (en) * | 2015-09-30 | 2015-12-16 | 南京师范大学 | Loudspeaker abnormal sound detection method and system |
| CN105979464A (en) * | 2016-05-13 | 2016-09-28 | 深圳市豪恩声学股份有限公司 | Pretreatment device and method for badness diagnosis of electroacoustic transducer |
| CN106507263A (en) * | 2016-12-29 | 2017-03-15 | 西安工程大学 | Speaker exception sound detecting circuit device and detection method based on adaptive-filtering |
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| CN113938806A (en) * | 2021-10-12 | 2022-01-14 | 台湾立讯精密有限公司 | Noise detection device and method thereof |
| US11262429B2 (en) * | 2020-06-12 | 2022-03-01 | Hangzhou Vango Technologies, Inc. | Method, apparatus and device for detecting abnormity of energy metering chip, and medium |
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| CN104168532A (en) * | 2013-05-15 | 2014-11-26 | 光宝光电(常州)有限公司 | Method and apparatus for abnormal noise detection of loudspeaker |
| 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 |
| CN103888884B (en) * | 2014-04-03 | 2017-05-24 | 联想(北京)有限公司 | Loudspeaker detecting method and device |
| CN103888884A (en) * | 2014-04-03 | 2014-06-25 | 联想(北京)有限公司 | Loudspeaker detecting method and device |
| CN105163262A (en) * | 2015-09-30 | 2015-12-16 | 南京师范大学 | Loudspeaker abnormal sound detection method and system |
| CN105163262B (en) * | 2015-09-30 | 2017-12-19 | 南京师范大学 | A kind of loudspeaker sound detection method and detecting system |
| CN105979464A (en) * | 2016-05-13 | 2016-09-28 | 深圳市豪恩声学股份有限公司 | Pretreatment device and method for badness diagnosis of electroacoustic transducer |
| CN106507263A (en) * | 2016-12-29 | 2017-03-15 | 西安工程大学 | Speaker exception sound detecting circuit device and detection method based on adaptive-filtering |
| CN106507263B (en) * | 2016-12-29 | 2019-11-26 | 西安工程大学 | Loudspeaker exception sound detecting circuit device and detection method based on adaptive-filtering |
| CN108419199A (en) * | 2017-02-10 | 2018-08-17 | 阿里巴巴集团控股有限公司 | Fault detection method, device and the equipment of acoustic signals, readable medium |
| US11262429B2 (en) * | 2020-06-12 | 2022-03-01 | Hangzhou Vango Technologies, Inc. | Method, apparatus and device for detecting abnormity of energy metering chip, and medium |
| CN112770244A (en) * | 2020-12-22 | 2021-05-07 | 北京城建智控科技有限公司 | Method and device for detecting line fault of loudspeaker and audio playing equipment |
| CN113938806A (en) * | 2021-10-12 | 2022-01-14 | 台湾立讯精密有限公司 | Noise detection device and method thereof |
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