KR20100119323A - Method of measuring sensitivity for a microphone - Google Patents

Method of measuring sensitivity for a microphone Download PDF

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Publication number
KR20100119323A
KR20100119323A KR1020090038384A KR20090038384A KR20100119323A KR 20100119323 A KR20100119323 A KR 20100119323A KR 1020090038384 A KR1020090038384 A KR 1020090038384A KR 20090038384 A KR20090038384 A KR 20090038384A KR 20100119323 A KR20100119323 A KR 20100119323A
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KR
South Korea
Prior art keywords
microphone
sensitivity
microcomputer
frequency
measuring
Prior art date
Application number
KR1020090038384A
Other languages
Korean (ko)
Inventor
민원식
Original Assignee
주식회사 현대오토넷
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Publication date
Application filed by 주식회사 현대오토넷 filed Critical 주식회사 현대오토넷
Priority to KR1020090038384A priority Critical patent/KR20100119323A/en
Publication of KR20100119323A publication Critical patent/KR20100119323A/en

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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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/04—Structural association of microphone with electric circuitry therefor
    • 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

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

Abstract

PURPOSE: A method for measuring the sensitivity of a microphone is provided to maintain the performance of the microphone by improving the quality of voice according to the state of the microphone. CONSTITUTION: A microcomputer(40) regulates the applying time and frequency of power to a microphone(20) by controlling a power switching part(30). The microcomputer supplies power to the microphone based on frequency band by controlling the power switching part. The microphone calculates the output waveform of the microphone. The performance of the microphone for each frequency is verified and the quality of voice is improved using a comparison table including inputted voltage from the microphone, a pre-set output time, and an input time.

Description

How to measure the sensitivity of a microphone {Method of measuring sensitivity for a microphone}

The present invention relates to a microphone, and more particularly, to a method for measuring the sensitivity of a microphone for controlling the power supplied to the microphone to grasp the operating performance of the microphone for each frequency and improving the sensitivity.

A microphone is an electro-acoustic transducer used to convert acoustic energy into electrical energy. According to the principle of operation, a dynamic microphone and a condenser microphone, piezoelectric microphone using piezoelectric phenomenon, carbon microphone using contact resistance of carbon particles, sound pressure There are omnidirectional pressure microphones that produce proportional output and bidirectional speed microphones that produce output proportional to the sound particle velocity.

Hereinafter, a conventional microphone will be described.

Microphones are commonly used in mobile phones, laptops, hands-free microphones, and other electronic devices, and demand is expected to increase further.

Small microphones are often installed in small electronics to function as microphones, but there are many improvements in sound quality and performance.

For example, the frequency-specific sensitivity of the microphone during voice sampling for measuring the operation of the conventional microphone could not be measured. Since the operation of the microphone could not be checked as appropriate, the microphone could not actively respond to changes in the sensitivity of the microphone and could not compensate for the degradation of the call quality and recognition rate of the microphone, and thus the reliability of the microphone was not high.

The present invention solves the above-described problems, the present invention is to determine the sensitivity of the microphone by checking whether the operation of the microphone is appropriate to determine the sensitivity of the microphone and to improve the performance of the microphone by adjusting the gain when the quality is degraded It aims to provide.

The present invention provides a method for measuring the sensitivity of the microphone to control the power supplied to the microphone on and off to grasp the output waveform of the microphone for each frequency to determine the performance of the microphone and to improve the sensitivity by adjusting the gain of the inferior frequency band For the purpose of

The method of the present invention for achieving the above object is a first step of supplying by controlling the application of the power to the microphone in the microcomputer and the operation of the microphone by frequency by receiving the output signal of the microphone when the power supply from the microcomputer It characterized in that it comprises a second step of measuring.

In addition, the first step of the present invention is to control the power switching unit in the microcomputer to adjust the application time of the power supplied to the microphone to distinguish the frequency band and to supply power by switching the power off, on or on, off by half wavelength of the frequency band It characterized in that it comprises.

In addition, measuring the operation of the microphone of the present invention includes counting the time when the output voltage of the microphone enters the high section in the microcomputer and using the reference output time and input time comparison table to determine the performance of the microphone for each frequency Determining the performance of the microphone is characterized in that to improve the sound quality by controlling the amplification rate for each frequency of the speech processing unit if the sensitivity measurement result compensation in the microcomputer.

In addition, measuring the operation of the microphone is a time difference between the original signal by measuring the time (b) and the magnitude (a) of receiving the output waveform output from the microphone through the A / D converter at the microcomputer to reach the highest voltage level And determining the performance of the microphone for each frequency by comparing the amplitude and the size, and determining the performance of the microphone by controlling the gain of an equalizer chip or amplification circuit connected to the voice processing unit in the microphone. It characterized in that it comprises improving.

The present invention can grasp the performance of the microphone used in various electronic devices, such as mobile phones, laptops, MP3, hands-free microphone, and compensates for any abnormality, thereby improving the performance of the microphone.

Therefore, the present invention has the effect of maintaining the performance of a more uniform microphone because it grasps the state of the microphone used in a plurality of electronic devices and improves the sound quality.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted.

The present invention checks the sensitivity of the microphone by checking whether the operation of the microphone, such as a mobile phone, a notebook, an MP3, an electronic dictionary, etc., which is recently increased in utilization, is appropriate and checks the sensitivity of the microphone and adjusts the gain by adjusting the gain when the quality is deteriorated. A method of measuring the sensitivity of a microphone that provides performance.

1 is a block diagram for measuring the sensitivity of the microphone according to an embodiment of the present invention.

The present invention inputs a pulse for each frequency to the power supply terminal of the microphone and detects the waveform output from the microphone after the pulse input, and measure the voltage and frequency of the waveform to determine whether the sensitivity of the microphone is appropriate for each frequency and the performance is not normal Adjust.

Referring to the drawings, the configuration of the present invention includes a microphone 20, a power switching unit 30, a microcomputer 40, and a voice processing unit 50.

The present invention is to adjust the frequency by controlling the application time of the power supplied to the microphone 20 by controlling the power switching unit 30 in the microcomputer 40, switching the power from off to on by half wavelength of the corresponding frequency band do.

The microcomputer 40 controls the power switching unit 30 to supply power to the microphone 20 for each frequency band (input waveform), and calculates and outputs the output waveform of the microphone 20 from the microcomputer 40. In this case, when the output voltage of the microphone 20 is too small, it may be detected by the microcomputer 40 by adding an amplifier circuit.

The microcomputer 40 counts the time point at which the voltage input from the microphone 20 enters the high recognition section, and determines the performance of the microphone for each frequency using a preset output time and input time comparison table.

When tested in this manner, the microphone 20 having poor performance does not enter the high recognition section or is late and enters quickly when the sensitivity is good.

As described above, the present invention is to grasp the performance of the microphone 20 for each frequency band by adjusting the application time of the power supplied to the microphone 20. The microphone 20 is checked by checking the output of the microphone 20 for an input voltage. Judge the performance.

In this case, when the sensitivity of the microphone 20 is determined and it is determined that compensation is necessary, the microcomputer 40 uses the aforementioned output time and input time comparison table to determine the amplification ratio for each frequency of the portion where the performance of the microphone for each frequency is insufficient. Control through 50 to improve sound quality.

In addition, the hardware may be applied to improve the sensitivity of the microphone 20 for each frequency by installing an equalizer chip or an amplifier circuit between the microphone 20 and the voice processing unit 50 and adjusting gain. At this time, it is also possible to provide an equalizer chip or an amplifier circuit in the voice processing unit 50.

Figure 2 is a block diagram for measuring the sensitivity of the microphone according to an embodiment of the present invention.

Referring to the drawings, the configuration of FIG. 2 of the present invention includes a microphone 20, a power switching unit 30, a microcomputer 40, an analog-to-digital converter 60, and a voice processing unit 50. It is made to include.

2 is different from FIG. 1, in which an A / D converter (analog to digital converter) 60 is mounted on the microcomputer 40 to measure and improve the sensitivity of the microphone 20.

Referring to the operation, the microcomputer 40 controls the power switching unit 30 to adjust the application time of the power supplied to the microphone 20 to distinguish the frequencies, and switch the power from off to on by half wavelength of the corresponding frequency band. do.

The microcomputer 40 controls the power switching unit 30 and power is supplied to the microphone 20 (input waveform), and the output waveform of the microphone 20 is converted into an analog to digital converter (60). Receive calculation at the microcomputer 40 through). In this case, when the output voltage of the microphone 20 is too small, it may be detected by the microcomputer 40 by adding an amplifier circuit.

An analog-to-digital converter (60) 60 uses the output waveform of the microphone 20 to measure the peak arrival time of the returned voltage.

The microcomputer 40 calculates the time and wavelength of the output waveform of the microphone 20 received through the analog-to-digital converter 60 to determine the performance of the microphone 20 for each frequency.

Referring to the graph of FIG. 3, the microcomputer 40 measures the time (b) and the magnitude (a) when the output waveform of the microphone 20 reaches the voltage highest level (recovery waveform), thereby measuring the time difference and magnitude with the original signal. Compare the values to determine whether they are working properly, and if any abnormality is found, adjust the amplification factor for each frequency to improve the microphone's performance.

As described above, the present invention is to grasp the performance of the microphone 20 by frequency band by adjusting the application time of the power supplied to the microphone 20, and checks the output waveform of the microphone 20 with respect to the input voltage to the reference microphone. In comparison, the performance of the microphone 20 is determined, and if necessary, the amplification ratio for each frequency is adjusted to compensate.

When the sensitivity of the microphone 20 is judged to be necessary to compensate, the microcomputer 40 improves the sound quality by controlling the amplification rate for each frequency of the portion where the performance of the microphone for each frequency is insufficient through the voice processing unit 50.

In addition, by applying a hardware, it is possible to improve the sensitivity of the microphone 20 for each frequency by installing an equalizer chip or an amplifier circuit between the microphone 20 and the voice processing unit 50 and adjusting the gain. It is also possible to provide an equalizer chip or an amplifier circuit in the processing unit 50.

In the software method, the gain corrected by the microcomputer 40 may be received by the voice processing unit 50 to improve sensitivity of the microphone 20 for each frequency. In this case, the voice processing unit 50 is a unit including both an equalizer and an audio digital signal processor (DSP).

3 is an example of an input / output graph for processing sensitivity measurement of a microphone according to an embodiment of the present invention.

Referring to the drawings, the waveform on the left is an input waveform supplied to the microphone 20 by controlling the power switching unit 30 in the microcomputer 40, and the recovery waveform on the right is a waveform output from the microphone 20, as described above. As described above, the microcomputer 40 calculates the size and time of the input / output waveform to determine whether the microphone 20 is normally operated for each frequency and compensates for abnormality to improve performance.

In the case of FIG. 1, the performance of the microphone for each frequency is determined by counting a time point at which the output voltage of the microphone 20 enters a high section and using a preset output time and input time comparison table. Figure 1 is presented as a simple implementation using a general port without using an A / D converter.

As described above, the present invention measures and compensates the sensitivity for each frequency of the microphone by measuring the voltage and frequency reduced after the pulse input by inputting the pulse for each frequency to the power terminal of the microphone.

So far, the configuration and operation of the embodiment of the present invention have been described. The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims but also by the equivalents of the claims.

1 is a block diagram for measuring the sensitivity of the microphone according to an embodiment of the present invention.

Figure 2 is a block diagram for measuring the sensitivity of the microphone according to an embodiment of the present invention.

Figure 3 is an example of the input and output graph processing the sensitivity measurement of the microphone according to an embodiment of the present invention.

<Description of Major Symbols in Drawing>

20: microphone 30: power switching unit

40: microcomputer 50: voice processing unit

60: A / D converter

Claims (9)

A first step of supplying by controlling the application of power to the microphone from the microcomputer; And And measuring the operation of the microphone for each frequency by receiving and grasping the output signal of the microphone when power is supplied from the microcomputer. The method of claim 1, The first step is And controlling the power switching unit in the microcomputer to adjust an application time of the power supplied to the microphone to distinguish frequency bands, and supplying power by switching off, on, on, or off by half wavelength of the frequency band. How to measure the sensitivity of a microphone. The method of claim 1, Measuring the operation of the microphone, The method of measuring the sensitivity of the microphone, characterized in that the microcomputer counts the time when the output voltage of the microphone enters a high interval, and the performance of the microphone by frequency using a reference output time and the input time comparison table . The method of claim 3, wherein Determining the performance of the microphone, If the microcomputer needs to compensate for the result of the sensitivity measurement, the method of measuring the sensitivity of the microphone, characterized in that it comprises improving the sound quality by controlling the amplification rate for each frequency of the speech processing unit. The method of claim 3, wherein Determining the performance of the microphone, And if the microcomputer needs to compensate for the result of the sensitivity measurement, controlling the gain of the equalizer chip or the amplification circuit connected to the voice processing unit to improve the sound quality for each microphone. The method of claim 1, Measuring the operation of the microphone, The microcomputer receives the output waveform output from the microphone through an A / D converter and measures the time (b) and the magnitude (a) of reaching the highest voltage level, and compares the time difference with the magnitude of the original signal and the magnitude value. Method for measuring the sensitivity of the microphone, characterized in that it comprises determining the performance of the star microphone. The method of claim 6, Determining the performance of the microphone, Wherein the microcomputer is a method of measuring the sensitivity of the microphone, characterized in that to improve the sound quality for each frequency by adjusting the amplification rate for each frequency of the voice processing unit if the result of the sensitivity measurement of the microphone. The method according to claim 4 or 7, The speech processing unit is a sensitivity measuring method of the microphone, characterized in that the equalizer and the audio DSP. The method of claim 6, Determining the performance of the microphone, And controlling the gain of the equalizer chip or the amplification circuit connected to the voice processing unit in the microphone to improve the sound quality for each microphone.
KR1020090038384A 2009-04-30 2009-04-30 Method of measuring sensitivity for a microphone KR20100119323A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016111583A1 (en) * 2015-01-08 2016-07-14 한국기술교육대학교 산학협력단 Microphone

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016111583A1 (en) * 2015-01-08 2016-07-14 한국기술교육대학교 산학협력단 Microphone
CN107113522A (en) * 2015-01-08 2017-08-29 韩国技术教育大学产学协力团 Microphone
US10182288B2 (en) 2015-01-08 2019-01-15 Korea University Of Technology And Education Industry-University Cooperation Foundation Microphone
CN107113522B (en) * 2015-01-08 2020-06-09 韩国技术教育大学产学协力团 Microphone

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