CN202168211U - Device for measuring loudspeaker parameters by laser sensor - Google Patents
Device for measuring loudspeaker parameters by laser sensor Download PDFInfo
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- CN202168211U CN202168211U CN2011200959975U CN201120095997U CN202168211U CN 202168211 U CN202168211 U CN 202168211U CN 2011200959975 U CN2011200959975 U CN 2011200959975U CN 201120095997 U CN201120095997 U CN 201120095997U CN 202168211 U CN202168211 U CN 202168211U
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- laser sensor
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Abstract
The utility model puts forward a device for measuring loudspeaker parameters by a laser sensor, comprising a computer and a testing bracket, wherein the computer is connected with a digital analogy analog-to-digital conversion module; the digital analogy analog-to-digital conversion module is connected with a power amplifier, a laser sensor and a current sensor; and the laser sensor is arranged on the testing bracket. The device can be applied to the design verification and product quality inspection of loudspeakers.
Description
Technical field
The utility model belongs to the parameter measuring apparatus of loud speaker, specifically through vibrating diaphragm Oscillation Amplitude and load current are carried out System Discrimination, obtains the device
of a plurality of parameters of electro-acoustic product.The loud speaker research and development and the product quality that can be widely used in electroacoustic enterprise detect.
Background technology
The meaning of loud speaker parameter measurement:
The loud speaker parameter has important effect to speaker design, manufacturing and quality control.Since 1970, Australian A. N. Thiele and R. H. Small have proposed the T/S parameter of speaker system, make the possibility that is designed to that realizes speaker system through the filter synthesis method.Small-signal parameter wherein is in small signal driving, system's output, to record under the negligible situation of distortion, so claim linear dimensions again.This parameter can be used for characterizing the low frequency performance of loud speaker, should be in the quality control of speaker design and production.
The parameter measurement of loud speaker; Particularly the measurement of nonlinear parameter is the difficult problem of electroacoustic measurement circle; The measurement mechanism one of existing linear dimensions and nonlinear parameter is to need secondary to measure, troublesome poeration, and the result is inaccurate; The 2nd, influenced by ambient noise, ambient temperature and humidity, the 3rd, the equilbrium position of vibrating diaphragm is changed.
Summary of the invention
The purpose of the utility model is to propose a kind of device
that uses laser sensor testing of loudspeakers linearity and nonlinear parameter.
The utility model will solve is the troublesome poeration that has the testing of loudspeakers parameter devices to exist, and the result is inaccurate, measures the warm and humid problem that influences etc. of ambient noise, environment that receives.
The technical scheme of the utility model is:
It comprises computer and test bracket.Computer is connected with the digital-to-analogue analog-to-digital conversion module, the digital-to-analogue analog-to-digital conversion module is connected with power amplifier, laser sensor, current sensor, and laser sensor is installed on the test bracket.
Be provided with pumping signal generation module, response signal collection and the processing module, linear dimensions recognition module, nonlinear parameter recognition module, Subscriber Interface Module SIM and the calibration module that generate pumping signal in the computer; Pumping signal generation module, response signal collection and processing module are connected with the digital-to-analogue analog-to-digital conversion module; Subscriber Interface Module SIM is connected with pumping signal generation module, linear dimensions recognition module, nonlinear parameter recognition module; Linear dimensions recognition module, nonlinear parameter recognition module and response signal collection and processing module are connected, and calibration module is connected with the pumping signal generation module.
The utility model advantage is: at first, laser measurement is a non-cpntact measurement, need not to change equilbrium position, quality of vibrating diaphragm etc., and speaker operation is in normal condition; Secondly, laser measurement does not receive noise effect, and it is little that laser sensor is influenced by humiture.The 3rd, laser triangulation type displacement transducer precision can satisfy the measurement demand, does not receive material, quality, the shape of measured object, the restriction of reflectivity, and price and microphone are suitable.Therefore the utility model can satisfy the production line testing requirement of loud speaker.
?
Description of drawings
Fig. 1 is for using the method module map of laser sensor testing of loudspeakers parameter.
Fig. 2 is for using the system and device module map of laser sensor testing of loudspeakers parameter.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is further described.
As shown in the figure, the described a kind of device of current sensor measurement loud speaker parameter that uses of the utility model comprises computer 7 and test bracket 12.Computer 7 is connected with digital-to-analogue analog-to-digital conversion module 8, digital-to-analogue analog-to-digital conversion module 8 is connected with power amplifier 9, laser sensor 10, current sensor 11, and laser sensor 10 is installed on the test bracket 12.
Be provided with pumping signal generation module 1, response signal collection and the processing module 2, linear dimensions recognition module 3, nonlinear parameter recognition module 4, Subscriber Interface Module SIM 6 and the calibration module 5 that generate pumping signal in the computer 7; Pumping signal generation module 1, response signal collection and processing module 2 are connected with digital-to-analogue analog-to-digital conversion module 8; Subscriber Interface Module SIM 6 is connected with pumping signal generation module 1, linear dimensions recognition module 3, nonlinear parameter recognition module 4; Linear dimensions recognition module 3, nonlinear parameter recognition module 4 and response signal collection and processing module 2 are connected, and calibration module 5 is connected with pumping signal generation module 1.
The digital-to-analogue analog-to-digital conversion module 8 of the utility model is the parts that have been calibrated, so can be used for the calibration to system's intermediate power amplifier 9, laser sensor 10, current sensor 11.
Before the testing of loudspeakers parameter, calibration module control digital-to-analogue analog-to-digital conversion module 8 sends pumping signal, and the voltage of measuring under the power amplifier 9 two ends bringing onto load situation is corresponding, thereby calculates the frequency response and the distortion of power amplifier 9.Several of terraced steps through measuring the known specification on the test bracket 12 can calculate displacement-voltage ratio by fitting a straight line apart from corresponding voltage value, realize the calibration of laser sensor 10.Output with the calibrating resistance access power amplifier 9 of known resistance obtains the output loop electric current by output voltage than calibrating resistance value, is obtained the equivalent resistance of current sensor 11 again by current sensor 11 voltage specific output loop currents.
Subscriber Interface Module SIM 6 functions of the utility model be for Subscriber Interface Module SIM provide test interface, for user's input parameter judge and preserve, for The measured results show etc.
Digital-to-analogue analog-to-digital conversion module 8 has been realized the mutual conversion of digital signal and analog signal.The pumping signal that pumping signal generation module 1 in the computer 7 generates is a digital signal, after this module converts, is output as analog signal.
Power amplifier 9 amplifies the analog signal of digital-to-analogue analog-to-digital conversion module 8, exports tested speaker 13 to.Parameters such as the frequency response of power amplifier 9, distortion can realize calibration by calibration module.Be connected in series current sensor 11 in the output loop of power amplifier 9, the voltage at current sensor 11 two ends adopts four line mensurations to insert digital-to-analogue analog-to-digital conversion module 8.
What laser sensor 10 used is the laser triangulation displacement.Focus on diaphragm of loudspeaker surface with beam of laser with certain angle, the laser facula on the body surface images on the photoelectric sensor.The vibrating diaphragm displacement is different, and the position height of surperficial hot spot is different, and the angle of institute's scattering that receives or reflection ray is difference also.Photoelectric sensor can be measured the position of laser image spot, calculates the angle of chief ray, thereby calculates the immediate movement of vibrating diaphragm.
Press its testing procedure of order explanation of each module of the utility model at present:
1) the pumping signal generation module of being located in the computer 71 generates pumping signal, and pumping signal is a simple signal.This pumping signal is a digital signal, and this digital signal is exported after the digital-to-analogue analog-to-digital conversion module converts analog signal into;
2) power amplifier 9 exports measured device to after the analog signal of digital-to-analogue analog-to-digital conversion module 8 outputs is amplified;
3) laser sensor 10 is measured the displacement response signal of measured device 13; Current sensor 11 is measured the current responsing signal that flows through measured device; Current signal that obtains and displacement signal input digital-to-analogue analog-to-digital conversion module 8; Send into response signal collection and processing module after converting digital signal into through digital-to-analogue analog-to-digital conversion module 8; Be input to linear dimensions recognition module 3 and nonlinear parameter recognition module 4 to after treatment signal again,, obtain the linear dimensions and the nonlinear parameter of loud speaker through the linear dimensions identification model identification processing of linear parameter identification module 3 and the large-signal Volterra Model Distinguish processing of nonlinear parameter recognition module.
The linear dimensions of loud speaker comprises
R e,
l 0,
L Ces ,
R Es With
C Mes The nonlinear parameter linear dimensions bag of loud speaker
Draw together
Bl(
x),
K(
x) and
Le(
x), wherein:
Bl(
x)?=?
b 0?+?
b 1 x?+?
b 2 x 2
K(
x)?=?
k 0?+?
k 1 x?+?
k 2 x 2
L e (
x)?=?
l 0?+?
l 1 x?+?
l 2 x 2 。
Measured device 13 comprises that moving-coil speaker unit or loud speaker close case system or loud speaker phase inverting box system.
Above embodiment only in order to the explanation the utility model and and the described technical scheme of unrestricted the utility model; Therefore, although this specification has carried out detailed explanation to the utility model with reference to each above-mentioned embodiment,, those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the utility model; And all do not break away from the technical scheme and the improvement thereof of the spirit and the scope of utility model, and it all should be encompassed in the middle of the claim scope of the utility model.
Described each meaning of parameters of the utility model sees the following form:
Claims (1)
1. device that uses laser sensor testing of loudspeakers parameter; Comprise computer and test bracket; It is characterized in that computer is connected with the digital-to-analogue analog-to-digital conversion module, the digital-to-analogue analog-to-digital conversion module is connected with power amplifier, laser sensor, current sensor, laser sensor is installed on the test bracket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200959975U CN202168211U (en) | 2011-04-02 | 2011-04-02 | Device for measuring loudspeaker parameters by laser sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200959975U CN202168211U (en) | 2011-04-02 | 2011-04-02 | Device for measuring loudspeaker parameters by laser sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202168211U true CN202168211U (en) | 2012-03-14 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200959975U Expired - Lifetime CN202168211U (en) | 2011-04-02 | 2011-04-02 | Device for measuring loudspeaker parameters by laser sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202168211U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105307099A (en) * | 2015-11-11 | 2016-02-03 | 西安工程大学 | System for testing power of loudspeaker and method for testing power and low-frequency parameter |
| CN106714067A (en) * | 2015-11-17 | 2017-05-24 | 研祥智能科技股份有限公司 | Automatic detection method on production line and automatic detection device thereof |
| CN108111704A (en) * | 2016-11-24 | 2018-06-01 | 中国科学院声学研究所 | A kind of non-contact type self adaption echo cancelling device and echo cancel method |
-
2011
- 2011-04-02 CN CN2011200959975U patent/CN202168211U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105307099A (en) * | 2015-11-11 | 2016-02-03 | 西安工程大学 | System for testing power of loudspeaker and method for testing power and low-frequency parameter |
| CN105307099B (en) * | 2015-11-11 | 2018-10-02 | 西安工程大学 | A kind of test method of Loudspeaker Power Test System and power and low-frequency parameter |
| CN106714067A (en) * | 2015-11-17 | 2017-05-24 | 研祥智能科技股份有限公司 | Automatic detection method on production line and automatic detection device thereof |
| CN106714067B (en) * | 2015-11-17 | 2020-12-15 | 研祥智能科技股份有限公司 | Automatic detection method and device on production line |
| CN108111704A (en) * | 2016-11-24 | 2018-06-01 | 中国科学院声学研究所 | A kind of non-contact type self adaption echo cancelling device and echo cancel method |
| CN108111704B (en) * | 2016-11-24 | 2019-12-24 | 中国科学院声学研究所 | Non-contact self-adaptive echo cancellation device and echo cancellation method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120314 |