TW201347566A - Microphone calibration method - Google Patents

Abstract

The present invention is related to a microphone calibration method, comprising: measuring standard sensitivities of a sample microphone under different frequencies of a standard testing sound source; and setting the sample microphone at a first position of a microphone testing system, measuring a first position sensitivity of the first position when a testing sound source of the microphone calibration system outputting a first signal at the first position, and calibrating a sound pressure of the first signal to a sound pressure of the standard testing sound source.

Description

Microphone correction method

The present invention relates to a microphone correction method, and more particularly to a microphone correction method capable of testing and correcting a large number of microphones to be tested.

The microphone is a kind of radio equipment. It has a wide range of applications. It is installed in various electronic devices such as mobile phones, tablet computers and notebook computers. In today's society where mobile devices such as mobile phones are popular, the demand for microphones is increasing. In response to the needs of users, the increase in microphone production, size miniaturization and quality requirements are the basic goals that the industry needs to achieve.

In order to reduce the defect rate when the microphone is shipped, it is necessary to directly test the basic data of the microphone to determine that the assembled microphone can operate normally, and the quality detection of the microphone before leaving the factory is gradually improved in response to the quality of the consumer.

The conventional microphone calibration method first uses a standard sound source to emit a fixed frequency (1 kHz) and a fixed sound pressure (94 dBSPL) sound signal, and uses a standard microphone to measure a sensitivity, and then according to the standard microphone sensitivity correction standard test sound source. The output sound pressure is corrected, and the standard test sound is calibrated to the frequency response of different frequencies, and then the sound signal provided by the standard test source is used to measure the sensitivity of the sample microphone. When testing the microphone to be tested, the microphone to be tested is placed into the test environment one by one to measure its sensitivity, and then compared with the sensitivity of the sample microphone as a reference for subsequent correction.

In order to meet the huge market demand, the industry does not increase the output to meet the needs. However, the above-mentioned conventional microphone method can only send a large number of microphones to be tested to a costly laboratory for testing, whether it is commissioned by the laboratory or Manufacturers set up their own labs, both of which are very expensive, and because they can only be tested for a single microphone to be tested at a time, making calibration testing extremely labor-intensive, is not conducive to the mass production efficiency of the microphone.

Based on the above, it is urgent for the industry to provide a microphone calibration test method capable of simultaneously improving production efficiency and reducing the test calibration cost of the microphone to be tested.

An object of the present invention is to provide a simple, fast and low-cost microphone calibration method, which enables the calibration test of the microphone to be tested to be batch-completed, and does not need to be tested and corrected in the laboratory, thereby improving the production efficiency of the microphone and Test the calibration cost.

For the above purposes and other purposes, the microphone calibration method of the present invention comprises: first measuring a standard sensitivity of a sample microphone at a different frequency of a standard test source; placing the sample microphone in a first position of a microphone test system. When one of the microphone test systems outputs a first signal at the first position, measuring a first position sensitivity of the sample microphone at the first position, and according to the standard sensitivity and the first position sensitivity, Correcting a sound pressure when the test signal source outputs the first signal to a sound pressure of the standard test sound source; using the corrected test sound source to output the first signal, measuring the sample microphone in a second position and second Position sensitivity; and comparing the standard sensitivity with the second position sensitivity to obtain a second position compensation value of the first signal.

Another microphone calibration method of the present invention comprises: first measuring a standard sensitivity of a sample microphone at a different frequency of a standard test sound source; placing the sample microphone in a first position of a microphone test system, the microphone test system When a test sound source outputs a first signal at the first position, measuring a first position sensitivity of the sample microphone at the first position, and outputting the test sound source according to the standard sensitivity and the first position sensitivity The sound pressure correction of the first signal is the sound pressure of the standard test sound source; the first signal is outputted by using the corrected test sound source, and the plurality of sample microphones are simultaneously placed in a plurality of positions of a microphone test system, and the measurement is performed. Sensitivity of the sample microphones to the positions, wherein the first position is different from the positions; and comparing the standard sensitivity with the sensitivity of the positions to obtain compensation values for the positions of the first signal.

The above objects, technical features, and advantages will be more apparent to those skilled in the art, and the following detailed description of the preferred embodiments of the invention.

The present invention will be explained by the following examples, but the description of the embodiments is merely illustrative of the technical contents of the present invention and the effects thereof, and is not intended to limit the present invention. It should be noted that in the following embodiments and the drawings, components that are not directly related to the present invention have been omitted and are not shown; and the dimensions and relative positional relationships of the components in the drawings are only used for illustration and not for use. Limit the implementation scale and size.

An embodiment of the present invention is a microphone correction method, and the flowchart thereof is as shown in Figs. 1A to 1C. The microphone calibration method of this embodiment is applied to a microphone test system.

As shown in the setting diagrams of FIG. 2A to FIG. 3B, the microphone test system includes: a standard sound source 201, a standard microphone 203, a standard test sound source 205, a sample microphone 207, a test sound source 209, and a microphone setting platform. 211, the microphone setting platform 211 has a plurality of setting positions 31 to 37. The setting position of the embodiment has seven, that is, the first intermediate position 31 and the second position 32 and the third position 33 on both sides. The fourth position 34, the fifth position 35, the sixth position 36, and the seventh position 37. As in this embodiment, the standard test sound source 205 and the test sound source 209 can be any one of a manual mouth, a full-range speaker, or a sounding speaker.

As shown in FIG. 1A to FIG. 1C, the detailed procedure of the microphone calibration method of this embodiment is as follows:

In step 100, please refer to FIG. 2A to FIG. 2B at the same time, the standard sound source 201 can emit a fixed frequency and a fixed sound pressure, for example, a signal with a sound pressure of 94 dBSPL and a frequency of 1000 Hz, and the standard sound source is measured by a standard microphone 203. 201 to obtain a reference sensitivity of the standard microphone 203. Then, the sound pressure of the sound source 205 is tested using the reference sensitivity correction standard of the standard microphone 203; in detail, when the sound pressure of the standard test sound source 205 provides an audio signal, the standard microphone 203 receives a non-standard sensitivity after receiving. At this time, the output sound pressure of the standard test sound source 205 is adjusted based on the reference sensitivity of the standard microphone 203, thereby correcting the standard test sound source 205.

In step 101, please refer to FIG. 2C. In a standard test environment, firstly, the standard test source 205 is used to provide audio signals of different frequencies, and a sample microphone 207 is received to receive audio signals of different frequencies, and the corresponding signals are corresponding to different frequencies. Several standard sensitivities, here the sample microphone 207 is also known as the standard sample (goldensample). The standard test environment is a soundless room, a soundless box or a soundproof box, but is not limited thereto.

Step 103, please refer to FIG. 3A at the same time, set the sample microphone 207 to the first position 31 of the microphone setting platform 211 in the microphone test system, so that the test sound source 209 of the microphone test system outputs a first signal, and then the sample microphone 207 is measured. The first position 31 receives the first position sensitivity of the first signal, and the sample microphone 207 disposed at the first position 31 can receive the sound pressure transmitted by the first signal, and then adopt the first position sensitivity and standard. Sensitivity is the criterion, and the output sound pressure of the test source 209 is corrected to the standard sound pressure of the standard test source 205. The first signal has a first frequency, and the standard sensitivity here, that is, the standard test source 205 provides the first frequency audio signal, the sample microphone 207 receives the standard sensitivity obtained.

In step 105, please refer to FIG. 3B, set the sample microphone 207 to a second position 32, and then use the test source 209 corrected in the previous step to output the first signal, and the measurement sample microphone 207 receives the first signal. A second position sensitivity associated with the second position 32 is generated.

Step 107: Compare the standard sensitivity with the second position sensitivity to obtain a second position compensation value of the first signal.

In step 109, the sample microphone 207 is set to a third position 33, and the test sound source 209 corrected in step 103 is used to output a first signal. After the measurement sample microphone 207 receives the first signal, the generated third position 33 is generated. Correlating a third position sensitivity; comparing the standard sensitivity with the third position sensitivity to obtain a third position compensation value of the first signal.

In step 111, the sample microphone 207 is set to a fourth position 34, and the test sound source 209 corrected in step 103 is used to output a first signal. After the measurement sample microphone 207 receives the first signal, the generated fourth position 34 is generated. Correlating a fourth position sensitivity; comparing the standard sensitivity with the fourth position sensitivity to obtain a fourth position compensation value of the first signal.

In step 113, the sample microphone 207 is set to a fifth position 35, and the test sound source 209 corrected in step 103 is used to output a first signal. After the sample microphone 207 receives the first signal, the generated sample and the fifth position 35 are generated. Correlating a fifth position sensitivity; comparing the standard sensitivity with the fifth position sensitivity to obtain a fifth position compensation value of the first signal.

In step 115, the sample microphone 207 is set to a sixth position 36, and the test sound source 209 corrected in step 103 is used to output the first signal. After the sample microphone 207 receives the first signal, the generated and sixth position 36 is generated. Correlating a sixth position sensitivity; comparing the standard sensitivity with the sixth position sensitivity to obtain a sixth position compensation value of the first signal.

Step 117, the sample microphone 207 is set to a seventh position 37, and the test sound source 209 corrected in step 103 is used to output the first signal. After the sample microphone receives the first signal, the generated sample is associated with the seventh position 37. a seventh position sensitivity; comparing the standard sensitivity with the seventh position sensitivity to obtain a seventh position compensation value of the first signal.

As shown in FIG. 1C, the following steps 121 to 127 provide the difference between the adjustment of the microphone to be tested in the calibration test when receiving the different frequency signals, and the following steps are adjusted according to the correction step or the requirement, and the sequence is adjusted. Step 103 is performed after, or after any of steps 107 to 117.

In step 121, the sample microphone 207 is set to the first position, and the test sound source 209 corrected in step 103 is used to output a second signal. After the sample microphone 207 receives the second signal, the sample microphone 207 generates the first signal at the first position 31. The first position sensitivity associated with the second signal. The second signal has a second frequency, and the second frequency is different from the first frequency. It should be noted that the first position sensitivity here is related to the second signal, which is different from the first position sensitivity associated with the first signal in step 103.

Step 123: Correct a sound pressure when the test sound source 209 of the microphone test system outputs the second signal at the first position 31 to the sound pressure of the standard test sound source 205.

Step 125, using the corrected test sound source 209 to output a second signal, and measuring the second position sensitivity of the sample microphone 207 at the second position 32. It should be noted that the second position sensitivity here is related to the second signal, which is different from the second position sensitivity associated with the first signal in step 105.

Step 127, comparing the standard sensitivity with the second position sensitivity to obtain a second position compensation value of a second signal. It is noted that the second position compensation value here is related to the second signal, which is different from the second position compensation value associated with the first signal in step 107.

It should be noted that the above steps only test the compensation value of the second signal having the second frequency in the second position, but since the microphone to be tested has to be corrected in a specific frequency range and all the test positions, the sample microphone is still needed. Calibration tests are performed at all locations with signals of other frequencies, and thus can be easily derived by those skilled in the art, and thus will not be further described herein.

Moreover, as shown in FIG. 1D, the following steps 131 to 137 are another way to provide the difference between the required adjustments of the microphone to be tested in the calibration test when receiving different frequency signals, and the following steps may be visually corrected or required. The order of adjustment is adjusted, and is performed after step 103, or after any of steps 107 to 117.

In step 131, the sample microphone 207 is set to the first position, and the test sound source 209 is used to output a second signal. The sample microphone 207 receives the second signal and generates the first signal at the first position 31. The first position sensitivity associated with the second signal. The second signal has a second frequency, and the second frequency is different from the first frequency. It should be noted that the first position sensitivity here is related to the second signal, which is different from the first position sensitivity associated with the first signal in step 103.

Step 133: Compare the standard sensitivity with the first position sensitivity to obtain a first position compensation value of the second signal.

In step 135, the second position sensitivity of the sample microphone 207 at the second position 32 is measured using the second signal output by the test source 209. It should be noted that the second position sensitivity here is related to the second signal, which is different from the second position sensitivity associated with the first signal in step 105.

Step 137, comparing the standard sensitivity with the second position sensitivity to obtain a second position compensation value of a second signal. It is noted that the second position compensation value here is related to the second signal, which is different from the second position compensation value associated with the first signal in step 107.

Similarly, the above steps only test the compensation value of the second signal having the second frequency in the second position, but since the microphone to be tested has to be corrected in a specific frequency range and all the test positions, the sample microphone needs to be further The frequency signal is calibrated at all locations, so it is easy for those skilled in the art to push it, so this article will not be repeated. In addition, the main difference between the two methods of step 121 to step 127 and step 131 to step 137 is different operations when the second position is outputted by the first position (step 123 and step 133), the former directly corrects the sound pressure, and the latter uses the compensation. The value is corrected.

In addition, the microphone calibration method of the present invention can also set the sample microphone 207 in the first position 31 to the seventh position 37, that is, the seven sample microphones 207 are provided, thereby obtaining the standard sensitivity of the sample microphone 207 corresponding to different positions, and then By means of simultaneous testing, the sensitivity compensation values for each position are obtained.

In detail, please refer to Figure 4A, which is followed by step 103 above, and instead performs the following steps:

Step 305, the other six sample microphones 207 are also simultaneously disposed in the second position 32 to the seventh position 37, and then the first test signal is outputted by the corrected test sound source 209, and the sample microphone 207 is measured to receive the first signal. Generating a second position sensitivity, a third position sensitivity, a fourth position sensitivity, a fifth position sensitivity, a sixth position sensitivity, and a seventh position sensitivity associated with the second position 32 to the seventh position 37 Wherein the first position 31 to the seventh position 37 are all different.

Step 307, comparing the standard sensitivity and the second position sensitivity to the seventh position sensitivity to obtain one of the first signal second position compensation value, a third position compensation value, a fourth position compensation value, and a first A five-position compensation value, a sixth position compensation value, and a seventh position compensation value.

Compared with the processes of FIG. 2A to FIG. 2B, the above method only needs to execute step 100, step 101, step 103, step 305 and step 307.

As shown in FIG. 4B and FIG. 4C, respectively, it is two flow methods for providing a difference between the required adjustment of the microphone to be tested in the calibration test when receiving different frequency signals. The steps shown in the two figures can also be adjusted according to the requirements of the steps, after step 103, or after any of steps 107 to 117.

As shown in FIG. 4B, in step 401, the sample microphone 207 is set to the first position, and the corrected test sound source 209 outputs a second signal. After the measurement sample microphone receives the second signal, the first position is 31. A first position sensitivity associated with the second signal is generated.

Step 403, correcting a sound pressure when the test sound source 209 of the microphone test system outputs the second signal at the first position 31 to the sound pressure of the standard test sound source 205.

Step 405, the other six sample microphones 207 are also simultaneously disposed in the second position 32 to the seventh position 37, and the second signal is outputted by using the corrected test sound source 209, and the sample microphones 207 are measured to receive the second signal. Generating a second position sensitivity, a third position sensitivity, a fourth position sensitivity, a fifth position sensitivity, a sixth position sensitivity, and a seventh position sensitivity associated with the second position 32 to the seventh position 37 .

Step 407, comparing the standard sensitivity with the second position sensitivity to the seventh position sensitivity to obtain one of the second signal second position compensation value, a third position compensation value, a fourth position compensation value, and a first A five-position compensation value, a sixth position compensation value, and a seventh position compensation value.

In another aspect, as shown in FIG. 4C, in step 411, the sample microphone 207 is set to the first position, and the corrected test source 209 is used to output a second signal, and after the measurement sample microphone receives the second signal, A first position sensitivity associated with the second signal is generated at the first location 31.

Step 413: Compare the standard sensitivity with the first position sensitivity to obtain a first position compensation value associated with the second signal.

Step 415, the other six sample microphones 207 are also simultaneously disposed in the second position 32 to the seventh position 37, and the second test signal source 209 is used to output the second signal, and the sample microphones 207 are measured to receive the second signal. Generating a second position sensitivity, a third position sensitivity, a fourth position sensitivity, a fifth position sensitivity, a sixth position sensitivity, and a seventh position sensitivity associated with the second position 32 to the seventh position 37 .

Step 417, comparing the standard sensitivity with the second position sensitivity to the seventh position sensitivity, and referring to the first position compensation value of the second signal to obtain a second position compensation value of the second signal, respectively. a three-position compensation value, a fourth position compensation value, a fifth position compensation value, a sixth position compensation value, and a seventh position compensation value.

After the steps of the above-mentioned microphone calibration method are performed, the microphones to be tested to be tested can be set in the above seven positions, and the respective position compensation values of the different frequency signals obtained according to the foregoing steps can be used to correct the test settings in different positions. Measuring the microphone, improving the calibration test efficiency, and thus reducing the calibration test cost. It should be noted that the above seven positions are merely examples, and those skilled in the art can easily push the test methods and component configurations of other numbers of test positions.

Since the conventional microphone test calibration needs to be performed in the laboratory, the test calibration cost is extremely high. If the microphone to be tested is sent to the laboratory and is commissioned by others, it is necessary to set up a laboratories with high prices. The cost of testing is costly, and when it comes to mass production of microphones, it creates cost, professionalism and enforceability difficulties.

The microphone calibration method provided by the invention not only does not need to perform the test of the microphone to be tested in the laboratory, but also can test a plurality of microphones to be tested simultaneously by a single test sound source, and each position compensation value provided by the microphone correction method can be achieved one by one. The effect of the test. Therefore, the microphone calibration method of the present invention can greatly reduce the cost of subsequent calibration tests when the microphone is produced, and can simplify the complicated calibration test steps, and improve the productivity and improve the competitiveness of the manufacturer.

The invention has been described above in terms of the preferred embodiments, and it should be understood by those skilled in the art that the present invention is not intended to limit the scope of the invention. It should be noted that variations and permutations equivalent to those of the embodiments are intended to be included within the scope of the present invention. Therefore, the scope of protection of the present invention is defined by the scope of the patent application.

201. . . Standard source

203. . . Standard microphone

205. . . Standard test source

207. . . Sample microphone

209. . . Test source

211. . . Microphone setup platform

31, 32, 33, 34, 35, 36, 37. . . First position, second position, third position, fourth position, fifth position, sixth position, seventh position

1A to 1D and 4A to 4C are flowcharts of a microphone correction method according to an embodiment of the present invention;

2A to 3B are diagrams showing the arrangement of a microphone test system using the microphone correction method of the present invention.

Claims (15)

A method for correcting a microphone includes: first measuring a standard sensitivity of a sample microphone at a different frequency of a standard test source; placing the sample microphone in a first position of a microphone test system, one of the test systems of the microphone test system is When the first position outputs a first signal, measuring a first position sensitivity of the sample microphone at the first position, and outputting the test signal source to the first signal according to the standard sensitivity and the first position sensitivity One of the sound pressure corrections is the sound pressure of the standard test source. The method for correcting a microphone according to claim 1, further comprising: outputting the first signal by using the corrected test source, measuring a second position sensitivity of the sample microphone in a second position; and comparing the standard The sensitivity and the second position sensitivity are used to obtain a second position compensation value of the first signal. The microphone calibration method of claim 1, further comprising: placing the sample microphone in the first position, and measuring the sample microphone in the first position when the test sound source outputs a second signal at the first position The first position sensitivity of the position; and the sound pressure of the test source outputting the second signal is corrected to the sound pressure of the standard test source according to the standard sensitivity and the first position sensitivity. The microphone calibration method of claim 1, further comprising: placing the sample microphone in the first position, and measuring the sample microphone in the first position when the test sound source outputs a second signal at the first position The first position sensitivity of a position; and comparing the standard sensitivity with the first position sensitivity to obtain a first position compensation value of the second signal. The microphone calibration method of claim 3, further comprising: outputting the second signal by using the test source, measuring the sensitivity of the second position of the sample microphone at the second position; and comparing the standard sensitivity with the second The position sensitivity is obtained by a second position compensation value of one of the second signals. The microphone calibration method of claim 4, further comprising: outputting the second signal by using the test sound source, measuring the second position sensitivity of the sample microphone at the second position; and comparing the standard sensitivity with the second The position sensitivity is obtained by a second position compensation value of one of the second signals. The microphone calibration method of claim 1, wherein the first position is an intermediate position and the second position is a side position. The microphone calibration method of claim 1, wherein the first signal has a first frequency, wherein the first frequency is 1000 Hz. The microphone calibration method according to claim 3 or 4, wherein the second signal has a second frequency. The method for correcting the microphone according to claim 1 further includes: before measuring the standard sensitivity of a sample microphone at a different frequency, using a standard source to correct a standard microphone, and then using the standard microphone. The standard test source is calibrated, wherein the standard source can emit a fixed frequency and a fixed sound pressure. The microphone calibration method of claim 7, wherein the step of testing the sample microphone using a standard test source to obtain the standard sensitivity of the sample microphone is performed in a standard test environment. The microphone calibration method according to claim 9, wherein the standard test environment is a soundless room, a soundless box or a soundproof box. A method for correcting a microphone includes: first measuring a standard sensitivity of a sample microphone at a different frequency of a standard test source; placing the sample microphone in a first position of a microphone test system, one of the test systems of the microphone test system is When the first position outputs a first signal, measuring a first position sensitivity of the sample microphone at the first position, and outputting the test signal source to the first signal according to the standard sensitivity and the first position sensitivity The sound pressure is corrected to the sound pressure of the standard test source; the corrected test source is used to output the first signal, and the plurality of sample microphones are simultaneously placed in a plurality of positions of a microphone test system, and the sample microphones are measured. Sensitivity at the locations, wherein the first location is different from the locations; and comparing the standard sensitivity to the sensitivity of the locations to obtain compensation values for the locations of the first signal. The microphone calibration method of claim 13, further comprising: the test sound source outputting a second signal, measuring the first position sensitivity of the sample microphone at the first position; and testing the microphone test system The sound pressure is corrected to the sound pressure of the standard test source when the second signal is outputted from the first position; the second signal is outputted by the corrected test source, and the sample microphones are measured at the positions. Sensitivity; and comparing the sensitivity of the standard to the sensitivity of the locations to obtain compensation values for the locations of the second signal. The microphone calibration method of claim 13, further comprising: the test sound source outputting a second signal, measuring the first position sensitivity of the sample microphone at the first position; comparing the standard sensitivity with the first The position sensitivity is obtained by using the first position compensation value of the second signal; using the test sound source to output the second signal, and measuring the sensitivity of the sample microphones at the positions; and comparing the sensitivity of the standard with the sensitivity of the positions The compensation value of the positions of the second signal is obtained.