CN105681996A - High-efficiency microphone maximum output voltage measurement method - Google Patents
High-efficiency microphone maximum output voltage measurement method Download PDFInfo
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- CN105681996A CN105681996A CN201610206458.1A CN201610206458A CN105681996A CN 105681996 A CN105681996 A CN 105681996A CN 201610206458 A CN201610206458 A CN 201610206458A CN 105681996 A CN105681996 A CN 105681996A
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- output voltage
- maximum output
- microphone
- total harmonic
- harmonic distortion
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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
- H04R29/004—Monitoring arrangements; Testing arrangements for microphones
- H04R29/005—Microphone arrays
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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)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a high-efficiency microphone maximum output voltage measurement method in audio measurement. The method comprises audio signal inputting, total harmonic distortion calculating and result post-processing. The method is characterized by receiving a one-time test signal and carrying out distortion calculating on the signal, and directly reading the maximum output voltage value of a microphone in a total harmonic distortion graph in the follow-up process, thereby achieving the purposes of improving test efficiency and optimizing test flow and test time.
Description
Technical field
The present invention discloses a kind of maximum output voltage measuring method of microphone efficiently.
Background technology
In audio frequency is measured, the test of microphone is one of them important integral part. The maximum output voltage of microphone is also the important indicator weighing a microphone property quality. The maximum output voltage of microphone refers under the prerequisite that microphone output signal is undistorted, can stablize the maximum voltage value exported, and unit is V.
The output signal distortion of microphone all can exist always, and in accordance with international practices, can think undistorted when distortion is less than 1%. So maximum output voltage, it is possible to think the magnitude of voltage when the distortion value of microphone output signal reaches 1%.
Total harmonic distortion is defined as by IEC
Total harmonic distortion is defined as by IEEE
Usual total harmonic distortion THD takes the mode of definition in IEC standard to calculate.
The maximum output voltage of common microphone is measured, and is the discontinuous single-frequency signal first sending a series of different amplitude, then chooses the magnitude of voltage of total harmonic distortion closest to signal when 1% wherein as the maximum output voltage of microphone. The tolerance range of this kind of measuring method is relatively low, and also has very big uncertainty: discontinuous single-frequency signal, relatively can be fuzzyyer for defining of 1% total harmonic distortion, it is very difficult to be decided to be the total harmonic distortion of 1% accurately; This method also cannot carry out efficient batch testing owing to sending signal number of times reason simultaneously, can only carry out laboratory proofing. The frequency fixed amplitude gradual change that patent of the present invention is taked sweep width signal, the impact that can change of frequency be brought is eliminated, only send a signal when measuring simultaneously, receive a signal and carry out aftertreatment and analysis, substantially increase the efficiency of test, maximum for microphone output voltage production line batch testing is become a reality, product quality management control is had very big help.
Summary of the invention
It is an object of the invention to provide a kind of maximum output voltage measuring method of microphone efficiently, solve the deficiency of existing measuring method in test efficiency.
It is an object of the invention to be achieved through the following technical solutions:
A kind of maximum output voltage measuring method of microphone efficiently, comprising audio input signal, total harmonic distortion calculates, and result aftertreatment calculates. It is characterized in that, send and once sweep width test signal, receive a test signal, it is carried out spectral decomposition and carries out the survey calculation of maximum output voltage.
Described input signal be frequency fixed amplitude gradual change sweep width signal;
Described width signals collecting of sweeping only needs once;
It is the mode of Fast Fourier Transform (FFT) that described input signal carries out the account form of total harmonic distortion;
The aftertreatment of described maximum output voltage is taked to read fixing total harmonic distortion, reads the mode of output voltage values at that time;
Accompanying drawing explanation
With reference to the accompanying drawings the present invention is described in further detail below.
The flow process that Fig. 1 is the testing method that the present invention describes describes;
Embodiment
Embodiment
As shown in Figure 1, the maximum output voltage measuring method of the efficient microphone of one of the present invention, calculates (2) and maximum output voltage aftertreatment (3) comprising input signal (1), total harmonic distortion. It is characterized in that, only need to send once, receive a test signal, it is carried out total harmonic distortion calculating and aftertreatment, the survey calculation of the maximum output voltage of microphone can be realized.
The fixed frequency (such as 1kHz) sent from input signal sweep width signal, define the minimum change to maximum voltage value (such as 0.01～1V, wherein maximum voltage value should be determined on experiment basis), result measured by each magnitude of voltage in this signal is carried out fast Flourier conversion, and the standard according to corresponding IEC (or IEEE) carries out total harmonic distortion calculating, obtain total harmonic distortion frequency response curve, finally on total harmonic distortion frequency response curve, the output voltage values corresponding to certain total harmonic distortion (such as 1%) is read out.
The present invention carries out the test of the maximum output voltage of microphone by a kind of test mode simplified, and can reach the efficiency improving test, reduces the test duration, optimizes the object of batch testing.
Claims (6)
1. a measuring method for the maximum output voltage of the microphone in measuring about audio frequency, calculates (2) and result aftertreatment (3) comprising input signal (1), total harmonic distortion. It is characterized in that, receive a test signal and it is carried out distortion computation, follow-up directly in last handling process, the maximum output voltage value of microphone is automatically read from total harmonic distortion figures.
2. the measuring method of the maximum output voltage of microphone according to claim 1, it is characterised in that input signal (1) sweeps width signal for time domain.
3. the maximum output voltage measuring method of microphone according to claim 1, it is characterised in that time domain is swept width signal and carried out the method that Fast Fourier Transform (FFT) is taked in total harmonic distortion calculating (2).
4. the maximum output voltage measuring method of microphone according to claim 1, when it is characterized in that carrying out result aftertreatment (3), the frequency response curve of the total harmonic distortion obtained after total harmonic distortion is calculated the result of (2) is analyzed.
5. time domain according to claim 2 sweeps width signal, it is characterised in that frequency is fixed, and signal amplitude is from small to large.
6. result aftertreatment (3) according to claim 4, what take is that the mode that the fixing distortion of reading is worth corresponding input amplitude size from the frequency response curve of total harmonic distortion obtains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610206458.1A CN105681996A (en) | 2016-04-06 | 2016-04-06 | High-efficiency microphone maximum output voltage measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610206458.1A CN105681996A (en) | 2016-04-06 | 2016-04-06 | High-efficiency microphone maximum output voltage measurement method |
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| Publication Number | Publication Date |
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| CN105681996A true CN105681996A (en) | 2016-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610206458.1A Pending CN105681996A (en) | 2016-04-06 | 2016-04-06 | High-efficiency microphone maximum output voltage measurement method |
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| CN (1) | CN105681996A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109379689A (en) * | 2018-10-30 | 2019-02-22 | Oppo广东移动通信有限公司 | Loudspeaker total harmonic distortion measurement method, device, storage medium and measuring system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101600144A (en) * | 2008-11-27 | 2009-12-09 | 嘉兴中科声学科技有限公司 | Adopt continuous logarithm swept-frequency signal to obtain the method and system of a plurality of parameters of electro-acoustic product |
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2016
- 2016-04-06 CN CN201610206458.1A patent/CN105681996A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101600144A (en) * | 2008-11-27 | 2009-12-09 | 嘉兴中科声学科技有限公司 | Adopt continuous logarithm swept-frequency signal to obtain the method and system of a plurality of parameters of electro-acoustic product |
Non-Patent Citations (1)
| Title |
|---|
| RS TECH: "《数字麦克风测试指南》", 18 July 2011 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109379689A (en) * | 2018-10-30 | 2019-02-22 | Oppo广东移动通信有限公司 | Loudspeaker total harmonic distortion measurement method, device, storage medium and measuring system |
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| CB02 | Change of applicant information |
Address after: 100102 3A, SOHO tower, Wangjing East Avenue, Beijing, Chaoyang District, 1001 Applicant after: Beijing Ruisen new spectrum Polytron Technologies Inc Applicant after: Zhang Xiaohui Address before: 100102 3A, SOHO tower, Wangjing East Avenue, Beijing, Chaoyang District, 1001 Applicant before: BEIJING RS TECHNOLOGY CO., LTD. Applicant before: Zhang Xiaohui |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160615 |
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| WD01 | Invention patent application deemed withdrawn after publication |