CN106851514A - Nonlinear loudspeaker parameter test device system and method for testing - Google Patents

Nonlinear loudspeaker parameter test device system and method for testing Download PDF

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Publication number
CN106851514A
CN106851514A CN201710105148.5A CN201710105148A CN106851514A CN 106851514 A CN106851514 A CN 106851514A CN 201710105148 A CN201710105148 A CN 201710105148A CN 106851514 A CN106851514 A CN 106851514A
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Prior art keywords
loudspeaker
measured
nonlinear
voice coil
parameter
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CN201710105148.5A
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张亚东
杨丰华
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ZHONGSHAN TIANJIAN ELECTROACOUSTIC CO Ltd
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ZHONGSHAN TIANJIAN ELECTROACOUSTIC CO Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

This application provides nonlinear loudspeaker parameter test device system is related to, it includes DC bias signal output device, laser range finder and loudspeaker test system；The application also discloses that nonlinear loudspeaker parameter test method, including：DC bias signal output device applies DC offset voltage signal to loudspeaker to be measured, laser range finder measures the biasing displacement of loudspeaker voice coil, the impedance curve and displacement voltage transfer curve of loudspeaker are obtained by loudspeaker test system under conditions of the DC offset voltage signal value holding at loudspeaker two ends to be measured is constant, the numerical value of each nonlinear parameter that the loudspeaker under bias state occurs in voice coil loudspeaker voice coil is calculated, is repeated the above steps and is obtained the nonlinear curve of each nonlinear parameter.The application is directly tested loudspeaker by equipment such as loudspeaker test system and laser range finders, the nonlinear parameter of direct access loudspeaker, effectively improves the degree of accuracy of measurement data.

Description

Nonlinear loudspeaker parameter test device system and method for testing
【Technical field】
The application is related to nonlinear loudspeaker parameter measuring technical field, more particularly to nonlinear loudspeaker parameter testing dress Put and method of testing.
【Background technology】
With in the market increasingly increasing to speaker product quality requirements, the nonlinear analysis of loudspeaker unit vibration Increasingly it is taken seriously, currently available technology is usually that the nonlinear problem of loudspeaker vibration is analyzed using indirectly testing method, I.e. by building a circuit model for loudspeaker in advance, the test of loudspeaker analyzer is recycled and by auto-adapted fitting computing Method obtains the nonlinear loudspeaker parameter value of correlation, due to being that speaker circuit model is tested to carry out indirect analog and obtain Go out the nonlinear parameter of loudspeaker, the degree of accuracy is relatively low, be unfavorable for the research and development of practitioner.
【The content of the invention】
In order to improve the test accuracy of nonlinear loudspeaker parameter in order to practitioner research and development, this Shen Please provide can carry out directly test to improve the nonlinear loudspeaker parameter testing dress of the test data degree of accuracy to loudspeaker Put and method of testing.
The application is realized by following technical scheme：
Nonlinear loudspeaker parameter test device system, including：
DC bias signal output device, it is in series with loudspeaker to be measured, for can to loudspeaker output size to be measured The DC offset voltage signal of tune；
Laser range finder, biasing displacement of the voice coil loudspeaker voice coil that it is used to measure in loudspeaker to be measured in magnetic gap；
Loudspeaker test system, it is used to make loudspeaker to be measured by the regulation of the DC bias signal output device Under conditions of the DC offset voltage signal at two ends keeps constant, export transactional analysis signal to loudspeaker to be measured and measure to be measured The impedance curve and displacement-voltage transfer function curves of loudspeaker.
Further, the DC bias signal output device includes：
Dc source, it is used to export DC offset voltage signal to loudspeaker to be measured；
Voltage regulating device, it is series between the dc source and the loudspeaker to be measured, is used to adjust to be measured raising The DC offset voltage signal at sound device two ends；
D.C. voltmeter, its two ends for being parallel to the loudspeaker to be measured is used to measure the loudspeaker two ends to be measured The numerical value of DC offset voltage signal.
Further, the voltage regulating device be series between the loudspeaker to be measured and the dc source can Variohm.
Further, the loudspeaker test system is series at the DC bias signal output device and loudspeaker to be measured Between, and the two ends of the loudspeaker test system are also parallel with controlling switch, it is described to raise one's voice when the controlling switch disconnects Device test system can carry out impedance measurement to loudspeaker to be measured output transactional analysis signal and to loudspeaker to be measured.
Present invention also provides the method for testing of nonlinear loudspeaker parameter, comprise the following steps：
A, DC bias signal output device apply DC offset voltage signal to loudspeaker to be measured makes the loudspeaker to be measured Voice coil loudspeaker voice coil biased in magnetic gap；
B, the offset bit that the voice coil loudspeaker voice coil of the loudspeaker to be measured under the DC offset voltage signal is measured by laser range finder Move；
C, the DC offset voltage at the regulation holding loudspeaker two ends to be measured by DC bias signal output device are believed Under conditions of number value is constant, exports transactional analysis signal and obtain this to loudspeaker to be measured by loudspeaker test system and to be measured raise Impedance curve and displacement-voltage transfer function curves of the voice coil loudspeaker voice coil of sound device under offset position；
D, calculated by impedance curve and displacement-voltage transfer function curves the loudspeaker to be measured occur in voice coil loudspeaker voice coil it is inclined The numerical value of each nonlinear parameter under configuration state；
E, the size that DC offset voltage signal is varied multiple times by the regulation of DC bias signal output device, repeat to walk Rapid B to step D, measures biasing of the voice coil loudspeaker voice coil of the loudspeaker to be measured under corresponding DC offset voltage signal in magnetic gap Displacement and the numerical value of the nonlinear parameter of the loudspeaker to be measured under corresponding voice coil loudspeaker voice coil biasing displacement is calculated to obtain The nonlinear curve of each nonlinear parameter in the loudspeaker to be measured.
Further, the DC bias signal output device includes being used for exporting DC offset voltage to loudspeaker to be measured The dc source of signal, the variable resistance being series between dc source and loudspeaker to be measured and it is parallel to loudspeaker to be measured two The D.C. voltmeter at end, and in step C, the DC offset voltage for measuring the loudspeaker two ends to be measured by D.C. voltmeter is believed Number value, and when loudspeaker test system exports transactional analysis signal to loudspeaker to be measured, by adjusting variable resistance so that The DC offset voltage signal value at the loudspeaker two ends to be measured that D.C. voltmeter shows keeps constant.
Further, in step C, the loudspeaker test system is series at the DC bias signal output device and treats Survey between loudspeaker, and the two ends of the loudspeaker test system are also parallel with controlling switch, when the controlling switch disconnects, The loudspeaker test system can carry out impedance measurement to loudspeaker to be measured output transactional analysis signal and to loudspeaker to be measured.
Further, the nonlinear parameter includes electric power coupling factor Bl, oscillating mass Mms and mechanical compliance Cms.
Further, the impedance curve and displacement-voltage transfer function curves are as follows：
Impedance curve：
Z (s)=ZR(s)+sLe+Rdc；
Displacement-voltage transfer function curves：
Wherein：
S=j ω, s are imaginary part, and ω is angular frequency；
ZRS () is the motional impedance of loudspeaker；
LeIt is the voice coil loudspeaker voice coil inductance of loudspeaker；
RdcIt is the voice coil loudspeaker voice coil D.C. resistance of loudspeaker；
X (s) is the vibration displacement of different frequency；
U (s) is the voltage under different frequency；
Bls is the magnetic flux value under different frequency.
Further, the quantitative relation of the oscillating mass and electric power coupling factor is as follows：
Mms=Cmes (Bl) ^2
Wherein：
Cmes is transformed into the amount at electricity end for oscillating mass；
The quantitative relation of mechanical compliance and electric power coupling factor is as follows：
Cms=Lces/ (Bl) ^2
Wherein：
Lces is the amount at mechanical compliance conversion electricity end.
Compared with prior art, the application has the following advantages：
The application carries out directly test to loudspeaker to replace by equipment such as loudspeaker test system and laser range finders It is traditional to set up indirectly testing that circuit model tested to loudspeaker to analyze the nonlinear problem of loudspeaker vibration, with straight Obtain the nonlinear parameter for taking loudspeaker, it is to avoid because setting up the data error produced by speaker circuit model, can effectively improve The degree of accuracy of DATA REASONING.
【Brief description of the drawings】
In order to illustrate more clearly of the technical scheme in the embodiment of the present application, below will be to make needed for embodiment description Accompanying drawing is briefly described.
Fig. 1 is the circuit diagram of nonlinear loudspeaker parameter test device system；
Fig. 2 is displacement-voltage transfer function curves figure；
Fig. 3 is the nonlinear curve figure of Cms values and BL values.
【Specific embodiment】
Nonlinear loudspeaker parameter test device system as shown in Figure 1, including：DC bias signal output device, laser Rangefinder and loudspeaker test system.
The DC bias signal output device is included for the straight of loudspeaker to be measured output DC offset voltage signal Flow power supply, the voltage regulating device being series between the dc source and loudspeaker to be measured and be parallel to the loudspeaker to be measured Two ends are used to the D.C. voltmeter of the numerical value of the DC offset voltage signal for measuring the loudspeaker two ends to be measured, are adjusted by voltage The regulation of regulating device, the DC bias signal output device is used for the adjustable direct current biasing electricity of loudspeaker output size to be measured Pressure signal, it is preferred that the voltage regulating device be series at it is variable between the loudspeaker to be measured and the dc source Resistor.
Biasing displacement of the voice coil loudspeaker voice coil that the laser range finder is used to measure in loudspeaker to be measured in magnetic gap.
The loudspeaker test system is used to make to be measured raising one's voice by the regulation of the DC bias signal output device Under conditions of the DC offset voltage signal at device two ends keeps constant, export transactional analysis signal to loudspeaker to be measured and measurement is treated Survey the impedance curve and displacement-voltage transfer function curves of loudspeaker, it is preferred that the loudspeaker test system may be selected Soundcheck test systems or B＆K test systems.
Further, the loudspeaker test system is series at the DC bias signal output device and loudspeaker to be measured Between, and the two ends of the loudspeaker test system are also parallel with controlling switch, it is described to raise one's voice when the controlling switch disconnects Device test system can carry out impedance measurement to loudspeaker to be measured output transactional analysis signal and to loudspeaker to be measured.
Directly test is carried out to loudspeaker by equipment such as loudspeaker test system and laser range finders to be raised with direct access The nonlinear parameter of sound device, reduces data error, can effectively improve the degree of accuracy of DATA REASONING.
The present embodiment also discloses the method for testing of nonlinear loudspeaker parameter, comprises the following steps：
A, DC bias signal output device apply DC offset voltage signal to loudspeaker to be measured makes the loudspeaker to be measured Voice coil loudspeaker voice coil biased in magnetic gap；
B, the offset bit that the voice coil loudspeaker voice coil of the loudspeaker to be measured under the DC offset voltage signal is measured by laser range finder Move；
C, the DC offset voltage at the regulation holding loudspeaker two ends to be measured by DC bias signal output device are believed Under conditions of number value is constant, exports transactional analysis signal and obtain this to loudspeaker to be measured by loudspeaker test system and to be measured raise Impedance curve and displacement-voltage transfer function curves of the voice coil loudspeaker voice coil of sound device under offset position, the displacement-voltage transmission letter Number curve is as shown in Figure 2；
D, calculated by impedance curve and displacement-voltage transfer function curves the loudspeaker to be measured occur in voice coil loudspeaker voice coil it is inclined The numerical value of each nonlinear parameter under configuration state；
E, the size that DC offset voltage signal is varied multiple times by the regulation of DC bias signal output device, repeat to walk Rapid B to step D, measures biasing of the voice coil loudspeaker voice coil of the loudspeaker to be measured under corresponding DC offset voltage signal in magnetic gap Displacement and the numerical value of the nonlinear parameter of the loudspeaker to be measured under corresponding voice coil loudspeaker voice coil biasing displacement is calculated to obtain The nonlinear curve of each nonlinear parameter in the loudspeaker to be measured.
Further, the nonlinear parameter includes electric power coupling factor Bl, oscillating mass Mms and mechanical compliance Cms, institute The nonlinear curve figure for stating electric power coupling factor Bl and mechanical compliance Cms is as shown in Figure 3.
Further, the DC bias signal output device includes being used for exporting DC offset voltage to loudspeaker to be measured The dc source of signal, the variable resistance being series between dc source and loudspeaker to be measured and it is parallel to loudspeaker to be measured two The D.C. voltmeter at end, and in step C, the DC offset voltage for measuring the loudspeaker two ends to be measured by D.C. voltmeter is believed Number value, and when loudspeaker test system exports transactional analysis signal to loudspeaker to be measured, by adjusting variable resistance so that The DC offset voltage signal value at the loudspeaker two ends to be measured that D.C. voltmeter shows keeps constant.
Further, in step C, the loudspeaker test system is series at the DC bias signal output device and treats Survey between loudspeaker, and the two ends of the loudspeaker test system are also parallel with controlling switch, when the controlling switch disconnects, The loudspeaker test system can carry out impedance measurement to loudspeaker to be measured output transactional analysis signal and to loudspeaker to be measured.
Further, the impedance curve and displacement-voltage transfer function curves are as follows：
Impedance curve：
Z (s)=ZR(s)+sLe+Rdc；
Displacement-voltage transfer function curves：
Wherein：
S=j ω, s are imaginary part, and ω is angular frequency；
ZRS () is the motional impedance of loudspeaker；
LeIt is the voice coil loudspeaker voice coil inductance of loudspeaker；
RdcIt is the voice coil loudspeaker voice coil D.C. resistance of loudspeaker；
X (s) is the vibration displacement of different frequency；
U (s) is the voltage under different frequency；
Bls is the magnetic flux value under different frequency.
Further, the quantitative relation of the oscillating mass and electric power coupling factor is as follows：
Mms=Cmes (Bl) ^2
Wherein：
Cmes is transformed into the amount at electricity end for oscillating mass；
The quantitative relation of mechanical compliance and electric power coupling factor is as follows：
Cms=Lces/ (Bl) ^2
Wherein：
Lces is the amount at mechanical compliance conversion electricity end.
It is as described above to combine a kind of implementation method that particular content is provided, does not assert the specific implementation office of the application It is limited to these explanations.It is all approximate with the present processes, structure etc., identical, if or for being made under the application concept thereof Dry technology deduction or replace, should all be considered as the protection domain of the application.

Claims (10)

1. nonlinear loudspeaker parameter test device system, it is characterised in that including：
DC bias signal output device, it is in series with loudspeaker to be measured, for adjustable to loudspeaker output size to be measured DC offset voltage signal；
Laser range finder, biasing displacement of the voice coil loudspeaker voice coil that it is used to measure in loudspeaker to be measured in magnetic gap；
Loudspeaker test system, it is used to make loudspeaker two ends to be measured by the regulation of the DC bias signal output device DC offset voltage signal keep constant under conditions of, exported to loudspeaker to be measured and transactional analysis signal and measure to be measured raising one's voice The impedance curve and displacement-voltage transfer function curves of device.
2. nonlinear loudspeaker parameter test device system according to claim 1, it is characterised in that the direct current biasing Signal output apparatus include：
Dc source, it is used to export DC offset voltage signal to loudspeaker to be measured；
Voltage regulating device, it is series between the dc source and the loudspeaker to be measured, is used to adjust loudspeaker to be measured The DC offset voltage signal at two ends；
D.C. voltmeter, its two ends for being parallel to the loudspeaker to be measured is used to measure the direct current at the loudspeaker two ends to be measured The numerical value of biasing voltage signal.
3. nonlinear loudspeaker parameter test device system according to claim 2, it is characterised in that the voltage-regulation Device is the variable resistance being series between the loudspeaker to be measured and the dc source.
4. nonlinear loudspeaker parameter test device system according to claim 1, it is characterised in that the loudspeaker is surveyed Test system is series between the DC bias signal output device and loudspeaker to be measured, and the loudspeaker test system two End is also parallel with controlling switch, and when the controlling switch disconnects, the loudspeaker test system can be exported to loudspeaker to be measured Transactional analysis signal and impedance measurement is carried out to loudspeaker to be measured.
5. the method for testing of nonlinear loudspeaker parameter, it is characterised in that comprise the following steps：
A, DC bias signal output device apply DC offset voltage signal to loudspeaker to be measured makes the sound of the loudspeaker to be measured Circle is biased in magnetic gap；
B, the biasing displacement that the voice coil loudspeaker voice coil of the loudspeaker to be measured under the DC offset voltage signal is measured by laser range finder；
C, the DC offset voltage signal value at the regulation holding loudspeaker two ends to be measured by DC bias signal output device Under conditions of constant, by the way that loudspeaker test system is to loudspeaker to be measured output transactional analysis signal and obtains the loudspeaker to be measured Impedance curve and displacement-voltage transfer function curves of the voice coil loudspeaker voice coil under offset position；
D, calculated by impedance curve and displacement-voltage transfer function curves the loudspeaker to be measured voice coil loudspeaker voice coil occur biasing shape The numerical value of each nonlinear parameter under state；
E, the size that DC offset voltage signal is varied multiple times by the regulation of DC bias signal output device, repeat step B To step D, offset bit of the voice coil loudspeaker voice coil of the loudspeaker to be measured under corresponding DC offset voltage signal in magnetic gap is measured The numerical value of the nonlinear parameter of the loudspeaker to be measured under corresponding voice coil loudspeaker voice coil biasing displacement is moved and calculated to obtain this The nonlinear curve of each nonlinear parameter in loudspeaker to be measured.
6. the method for testing of nonlinear loudspeaker parameter according to claim 5, it is characterised in that the direct current biasing letter Number output device include for the dc source to loudspeaker to be measured output DC offset voltage signal, be series at dc source and Variable resistance between loudspeaker to be measured and the D.C. voltmeter at loudspeaker two ends to be measured is parallel to, and in step C, passed through D.C. voltmeter measures the DC offset voltage signal value at the loudspeaker two ends to be measured, and is raised to be measured in loudspeaker test system During sound device output transactional analysis signal, by adjusting variable resistance so that the loudspeaker two ends to be measured that show of D.C. voltmeter DC offset voltage signal value keeps constant.
7. the method for testing of nonlinear loudspeaker parameter according to claim 5, it is characterised in that described to raise in step C Sound device test system is series between the DC bias signal output device and loudspeaker to be measured, and loudspeaker test system The two ends of system are also parallel with controlling switch, and when the controlling switch disconnects, the loudspeaker test system can raise one's voice to be measured Device exports transactional analysis signal and carries out impedance measurement to loudspeaker to be measured.
8. the method for testing of nonlinear loudspeaker parameter according to claim 5, it is characterised in that the nonlinear parameter Include electric power coupling factor Bl, oscillating mass Mms and mechanical compliance Cms.
9. the method for testing of nonlinear loudspeaker parameter according to claim 8, it is characterised in that the impedance curve and Displacement-voltage transfer function curves are as follows：
Impedance curve：
Z (s)=ZR(s)+sLe+Rdc；
Displacement-voltage transfer function curves：
H x ( s ) = x ( s ) U ( s ) = Z R ( s ) Z ( s ) . 1 B l s ;
Wherein：
S=j ω, s are imaginary part, and ω is angular frequency；
ZRS () is the motional impedance of loudspeaker；
LeIt is the voice coil loudspeaker voice coil inductance of loudspeaker；
RdcIt is the voice coil loudspeaker voice coil D.C. resistance of loudspeaker；
X (s) is the vibration displacement of different frequency；
U (s) is the voltage under different frequency；
Bls is the magnetic flux value under different frequency.
10. the method for testing of nonlinear loudspeaker parameter according to claim 8, it is characterised in that the oscillating mass Quantitative relation with electric power coupling factor is as follows：
Mms=Cmes (Bl) ^2
Wherein：
Cmes is transformed into the amount at electricity end for oscillating mass；
The quantitative relation of mechanical compliance and electric power coupling factor is as follows：
Cms=Lces/ (Bl) ^2
Wherein：
Lces is the amount at mechanical compliance conversion electricity end.
CN201710105148.5A 2017-02-25 2017-02-25 Nonlinear loudspeaker parameter test device system and method for testing Pending CN106851514A (en)

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CN110650424A (en) * 2018-09-21 2020-01-03 奥音科技（北京）有限公司 Measuring device for measuring the force factor of a dynamic loudspeaker driver
CN113615211A (en) * 2019-01-10 2021-11-05 零件快递国际公司 Measuring non-linearity and asymmetry of a loudspeaker
CN113615211B (en) * 2019-01-10 2023-09-08 零件快递国际公司 Measuring non-linearities and asymmetries of loudspeakers
CN109783941A (en) * 2019-01-16 2019-05-21 珠海市精实测控技术有限公司 A kind of linear motor BL method based on small voltage model
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WO2021052110A1 (en) * 2019-09-18 2021-03-25 华为技术有限公司 Method and device for improving sound quality of speaker
CN110787983A (en) * 2019-10-25 2020-02-14 山东理工大学 Micro-beam nonlinear vibration combination signal generation device based on multi-frequency excitation
CN110787983B (en) * 2019-10-25 2021-04-02 山东理工大学 Micro-beam nonlinear vibration combination signal generation device based on multi-frequency excitation
CN111654799A (en) * 2019-12-31 2020-09-11 广州励丰文化科技股份有限公司 Loudspeaker unit identification method and device
WO2021248528A1 (en) * 2020-06-12 2021-12-16 瑞声声学科技(深圳)有限公司 Loudspeaker system identification method and apparatus therefor, storage medium, and communication terminal
CN111800713A (en) * 2020-06-12 2020-10-20 瑞声科技(新加坡)有限公司 Signal nonlinear compensation method and device, electronic equipment and storage medium
CN111796791A (en) * 2020-06-12 2020-10-20 瑞声科技(新加坡)有限公司 Bass enhancement method, system, electronic device and storage medium
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CN115550829B (en) * 2022-11-28 2023-02-28 杭州兆华电子股份有限公司 Method and system for testing T/S parameters of loudspeaker

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