CN203299278U - Loudspeaker impedance measuring device - Google Patents
Loudspeaker impedance measuring device Download PDFInfo
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- CN203299278U CN203299278U CN2013203675921U CN201320367592U CN203299278U CN 203299278 U CN203299278 U CN 203299278U CN 2013203675921 U CN2013203675921 U CN 2013203675921U CN 201320367592 U CN201320367592 U CN 201320367592U CN 203299278 U CN203299278 U CN 203299278U
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Abstract
The utility model discloses a loudspeaker impedance measuring device, comprising a detector, wherein one end of an output point of the detector is electrically connected with a positive electrode of a loudspeaker to be measured through a power amplifier, and another end of the output point is electrically connected with a negative electrode of the loudspeaker to be measured after being serially connected with a sampling resistor; two ends of an input point of the detector are respectively and electrically connected with the positive electrode and the negative electrode of the loudspeaker to be measured; and two ends of another input point of the detector are respectively and electrically connected with two ends of the sampling resistor. The loudspeaker impedance measuring device has the advantages of convenient operation and accurate measuring results.
Description
Technical field
The utility model relates to loudspeaker quality inspection technology field, specifically, relates to a kind of loudspeaker impedance measurement mechanism.
Background technology
Along with the development of loudspeaker industry, some application scenarios are more and more higher to the quality requirements of loudspeaker.Therefore the performance parameter of measuring exactly loudspeaker becomes the inevitable requirement of industry.
, by the impedance curve of loudspeaker, can derive the parameter for the speaker system design, so the impedance curve of loudspeaker is the important parameter that loudspeaker is only second to frequency response curve.
The impedance measurement method of existing loudspeaker the most easily is constant flow method, be about to the resistance series connection (for example resistance of 1K ohm) of loudspeaker to be measured and relative large resistance, because the impedance ranges of loudspeaker is much smaller than 1K ohm, when the output signal constant magnitude during with frequency change, electric current approximately constant in loop, only need to measure the voltage curve at loudspeaker two ends, divided by constant current value, namely obtain impedance curve.But there is following shortcoming in the impedance curve that adopts this constant flow method to measure loudspeaker:
1. constant current drive mode is not the service condition of loudspeaker reality, during the loudspeaker real work be to adopt the constant voltage type of drive, so constant flow method does not meet the actual service condition of loudspeaker.
2. when constant flow method is measured the impedance curve of loudspeaker, the constant current that output just is similar to, measurement result is inaccurate, has measuring error.
3. when constant flow method is measured the impedance curve of loudspeaker, because the series impedance resistance is large, signal source output size is restricted, therefore the electric current that flows through loudspeaker also is restricted, the power that finally is added on loudspeaker is less, and the actual service condition much smaller than loudspeaker, make measurement result inaccurate.
4. while measuring the impedance curve of loudspeaker due to constant flow method, the power that loudspeaker obtains is restricted, and the voltage on loudspeaker can't accomplish constant voltage, therefore can not measure simultaneously the frequency response curve of loudspeaker, also need to measure in addition the frequency response curve of loudspeaker, waste time and energy.
The utility model content
Technical problem to be solved in the utility model is: a kind of easy to operate, measurement result loudspeaker impedance measurement mechanism accurately is provided.
For solving the problems of the technologies described above, the technical solution of the utility model is:
A kind of loudspeaker impedance measurement mechanism, comprise detecting device, one end of an output point of described detecting device is electrically connected to the positive pole of loudspeaker to be measured after power amplifier, be connected with the negative electricity of described loudspeaker to be measured after the other end series connection sampling resistor of described output point; The two ends of an input point of described detecting device are connected with negative electricity with the positive pole of described loudspeaker to be measured respectively; The two ends of another input point of described detecting device are electrically connected to the two ends of described sampling resistor respectively.
Preferably, described detecting device is the audio-frequency test platform, and described audio-frequency test platform comprises the PC terminal and is installed to data collecting card on described PC terminal.
Preferably, described output point is the output point of described data collecting card, and described input point is the input point of described data collecting card.
Preferably, described PC terminal is computing machine or industrial computer.
After having adopted technique scheme, the beneficial effects of the utility model are:
Loudspeaker impedance measurement mechanism of the present utility model in use, first with the noninductive resistance that a resistance equals the rated impedance of loudspeaker to be measured, replace loudspeaker to be measured, gain coefficient K to power amplifier calibrates, determine the driving voltage Vout=U1/K of the output point of detecting device, wherein, U1 is the rated voltage of described loudspeaker to be measured; Make the driving voltage Vout of the output point output of described detecting device carry out frequency sweep in the scope of 20HZ to 20KHZ, record the voltage curve Vspk at described loudspeaker to be measured two ends by an input point of described detecting device; Make the driving voltage Vout of the output point output of described detecting device carry out frequency sweep in the scope of 20HZ to 20KHZ, record the voltage curve Vimp at described sampling resistor two ends by another input point of described detecting device; Calculate the electric current I=Vimp/Zimp in described loudspeaker to be measured loop, wherein Zimp is the resistance of described sampling resistor, can draw thus the impedance curve Zspk=Vspk/I of described loudspeaker to be measured, and wherein, Zspk is the impedance of described loudspeaker to be measured.Therefore, loudspeaker impedance measurement mechanism of the present utility model, adopted the constant voltage type of drive, easy to operate, as to meet loudspeaker actual service condition, and because the impedance of the resistance value ratio loudspeaker to be measured of sampling resistor is little, the power that is added on loudspeaker to be measured is larger, so measurement result is accurate; In addition, loudspeaker impedance measurement mechanism of the present utility model, what take is the constant voltage type of drive, can measure simultaneously the frequency response curve of loudspeaker to be measured, has reduced the surveying work amount of loudspeaker to be measured.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples:
Fig. 1 is the structural representation of loudspeaker impedance measurement mechanism of the present utility model;
In figure: 1, Labview audio-frequency test platform; 11, PC terminal; 12, data collecting card; 121, output point; 122, input point; 123, another input point; 2, loudspeaker to be measured; 3, power amplifier; 4, sampling resistor.
Embodiment
Fig. 1 is the structural representation of loudspeaker impedance measurement mechanism of the present utility model, with reference to Fig. 1, loudspeaker impedance measurement mechanism of the present utility model, comprise detecting device, in the present embodiment, detecting device is Labview audio-frequency test platform 1, and Labview audio-frequency test platform 1 comprises PC terminal 11 and is installed to data collecting card 12 on PC terminal 11.Certainly, detecting device also can adopt other audio-frequency test platform, and PC terminal 11 is computing machine or industrial computer.
One end of an output point 121 of data collecting card 12 is electrically connected to the positive pole of loudspeaker 2 to be measured after power amplifier 3, be connected with the negative electricity of loudspeaker 2 to be measured after the other end series connection sampling resistor 4 of output point 121; The two ends of an input point 122 of data collecting card 12 are connected with negative electricity with the positive pole of loudspeaker 2 to be measured respectively; The two ends of another input point 123 of data collecting card 12 are electrically connected to the two ends of sampling resistor 4 respectively.
The method of using loudspeaker impedance measurement mechanism of the present utility model to measure the impedance curve of loudspeaker 2 to be measured is:
A. replace loudspeaker 2 to be measured with the noninductive resistance that a resistance equals loudspeaker 2 rated impedances to be measured, gain coefficient K to power amplifier 3 calibrates, determine the driving voltage VOUT=U1/K of the output point of detecting device, wherein, U1 is the rated voltage of loudspeaker 2 to be measured; Replace noninductive resistance with loudspeaker 2 to be measured again;
B. make the driving voltage Vout of output point 121 outputs of detecting device carry out frequency sweep in the scope of 20HZ to 20KHZ, record the voltage curve Vspk at loudspeaker to be measured 2 two ends by an input point 122 of detecting device;
C. make the driving voltage Vout of output point 121 outputs of detecting device carry out frequency sweep in the scope of 20HZ to 20KHZ, record the voltage curve Vimp at employing resistance 4 two ends by another input point 123 of detecting device;
D. calculate the electric current I=Vimp/Zimp in loudspeaker to be measured 2 loops, wherein Zimp is the resistance of sampling resistor 4, can draw thus the impedance curve Zspk=Vspk/I of loudspeaker 2 to be measured, and wherein, Zspk is the impedance of loudspeaker 2 to be measured.
Wherein, detecting device is Labview audio-frequency test platform 1, and Labview audio-frequency test platform 1 comprises PC terminal 11 and is installed to data collecting card 12 on PC terminal 11.Labview is a kind of programming development environment, developed by American National instrument (NI) company, be similar to C and BASIC Labview development environment, but the remarkable difference of Labview and other computereses is: other computereses are all to adopt the text based language to produce code, and Labview be use be graphical author language G coding, the program of generation is the form of block diagram.Output point 121 is the output point of data collecting card 12, and input point is the input point of data collecting card.PC terminal 11 is computing machine or industrial computer.
Loudspeaker impedance measurement mechanism of the present utility model, adopted the constant voltage type of drive, easy to operate, as to meet loudspeaker actual service condition, and because the impedance of the resistance value ratio of sampling resistor 4 loudspeaker 2 to be measured is little, the power that is added on loudspeaker 2 to be measured is larger, so measurement result is accurate; In addition, loudspeaker impedance measurement mechanism of the present utility model and measuring method thereof, what take is the constant voltage type of drive, can measure simultaneously the frequency response curve of loudspeaker 2 to be measured, has reduced the surveying work amount of loudspeaker 2 to be measured.
The above is giving an example of the utility model preferred forms, and the part of wherein not addressing in detail is those of ordinary skills' common practise.Protection domain of the present utility model is as the criterion with the content of claim, and any equivalent transformation that carries out based on technology enlightenment of the present utility model, also within protection domain of the present utility model.
Claims (4)
1. loudspeaker impedance measurement mechanism, it is characterized in that: comprise detecting device, one end of an output point of described detecting device is electrically connected to the positive pole of loudspeaker to be measured after power amplifier, be connected with the negative electricity of described loudspeaker to be measured after the other end series connection sampling resistor of described output point; The two ends of an input point of described detecting device are connected with negative electricity with the positive pole of described loudspeaker to be measured respectively; The two ends of another input point of described detecting device are electrically connected to the two ends of described sampling resistor respectively.
2. loudspeaker impedance measurement mechanism as claimed in claim 1, it is characterized in that: described detecting device is the audio-frequency test platform, described audio-frequency test platform comprises the PC terminal and is installed to data collecting card on described PC terminal.
3. loudspeaker impedance measurement mechanism as claimed in claim 2, it is characterized in that: described output point is the output point of described data collecting card, described input point is the input point of described data collecting card.
4. loudspeaker impedance measurement mechanism as claimed in claim 2 or claim 3, it is characterized in that: described PC terminal is computing machine or industrial computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203675921U CN203299278U (en) | 2013-06-25 | 2013-06-25 | Loudspeaker impedance measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203675921U CN203299278U (en) | 2013-06-25 | 2013-06-25 | Loudspeaker impedance measuring device |
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| Publication Number | Publication Date |
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| CN203299278U true CN203299278U (en) | 2013-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013203675921U Expired - Lifetime CN203299278U (en) | 2013-06-25 | 2013-06-25 | Loudspeaker impedance measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103338429A (en) * | 2013-06-25 | 2013-10-02 | 歌尔声学股份有限公司 | Device and method for measuring impedance of loudspeaker |
-
2013
- 2013-06-25 CN CN2013203675921U patent/CN203299278U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103338429A (en) * | 2013-06-25 | 2013-10-02 | 歌尔声学股份有限公司 | Device and method for measuring impedance of loudspeaker |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee after: GOERTEK Inc. Address before: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee before: Goertek Inc. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131120 |