CN110958554B - Debugging method and debugging system for hall audio-visual system - Google Patents
Debugging method and debugging system for hall audio-visual system Download PDFInfo
- Publication number
- CN110958554B CN110958554B CN201911135280.6A CN201911135280A CN110958554B CN 110958554 B CN110958554 B CN 110958554B CN 201911135280 A CN201911135280 A CN 201911135280A CN 110958554 B CN110958554 B CN 110958554B
- Authority
- CN
- China
- Prior art keywords
- sound
- value
- pressure level
- measured
- hall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses a debugging method and a debugging system for a hall audio-visual system, which relate to the technical field of audio-visual system debugging and comprise the following steps: setting measuring positions of a plurality of loudspeakers in a hall, and measuring the measured values of sound transmission gain, maximum sound pressure level and sound field unevenness of the loudspeakers at different measuring positions; calculating reference values of the loudspeaker at different measuring positions; adjusting parameters of the audio processor and the parameter equalizer, and measuring the measured values of the transmission frequency characteristics in the hall corresponding to the parameters of the different audio processor and the parameter equalizer; and obtaining parameters of the audio processor and the parameter equalizer corresponding to the optimal value of the transmission frequency characteristic as actual parameters of the audio processor and the parameter equalizer.
Description
Technical Field
The invention relates to the technical field of audio-visual system debugging, in particular to a debugging method and a debugging system for a hall audio-visual system.
Background
The existing hall audio-visual system measures the sound transmission gain, the maximum sound pressure level, the sound field unevenness and the transmission frequency characteristic after the completion of the construction, and determines whether the construction of the audio-visual system meets the predetermined sound construction requirement or not according to the measured sound transmission gain, the maximum sound pressure level, the sound field unevenness and the transmission frequency characteristic.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a debugging method and a debugging system for a hall audio-visual system, which can ensure that the sound of the audio-visual system meets the preset requirements.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
in a first aspect, there is provided a commissioning method for a hall audiovisual system, the audiovisual system comprising a speaker, an audio processor and a parameter equalizer, the commissioning method comprising the steps of:
setting measuring positions of a plurality of loudspeakers in a hall, and measuring the measured values of sound transmission gain, maximum sound pressure level and sound field unevenness of the loudspeakers at different measuring positions;
calculating reference values of the loudspeaker at different measuring positions according to the measured values of the sound transmission gain, the maximum sound pressure level and the sound field unevenness of the loudspeaker at different measuring positions, as well as the standard value of the sound transmission gain, the standard value of the maximum sound pressure level and the standard value of the sound field unevenness;
determining the loudspeaker measuring position with the minimum reference value as the optimal position, and setting the loudspeaker at the optimal position;
adjusting parameters of the audio processor and the parameter equalizer, and measuring the measured values of the transmission frequency characteristics in the hall corresponding to the parameters of the different audio processor and the parameter equalizer;
and taking the measured value with the minimum absolute value subtracted from the standard value of the transmission frequency characteristic in the measured transmission frequency characteristic measured values as the optimal value of the transmission frequency characteristic, and acquiring the parameters of the audio processor and the parameter equalizer corresponding to the optimal value of the transmission frequency characteristic as the actual parameters of the audio processor and the parameter equalizer.
On the basis of the technical scheme, the method for measuring the sound transmission gain, the maximum sound pressure level and the sound field unevenness of the loudspeaker at different measurement positions specifically comprises the following steps:
uniformly selecting a plurality of measuring points in a hall;
a loudspeaker is arranged at a certain measuring position, and the measured values of the sound transmission gain, the maximum sound pressure level and the sound field unevenness among the plurality of measuring points are measured;
respectively averaging the measured values of the sound transmission gain, the maximum sound pressure level and the sound field unevenness of the plurality of measurement points to obtain a measured value of the sound transmission gain, a measured value of the maximum sound pressure level and a measured value of the sound field unevenness;
the above method is used to calculate the measured values of the sound transmission gain, the maximum sound pressure level and the sound field unevenness of the loudspeaker at all the measurement positions.
On the basis of the technical scheme, the method for calculating the reference values of the loudspeaker at different measuring positions specifically comprises the following steps:
subtracting the measured value of the sound transmission gain, the measured value of the maximum sound pressure level and the measured value of the sound field unevenness of the loudspeaker at a certain measuring position from the standard value of the sound transmission gain, the standard value of the maximum sound pressure level and the standard value of the sound field unevenness respectively to obtain a difference value of the sound transmission gain, a difference value of the maximum sound pressure level and a difference value of the sound field unevenness, and averaging the difference value of the sound transmission gain, the difference value of the maximum sound pressure level and the absolute value of the difference value of the sound field unevenness to obtain a reference value of the loudspeaker at the measuring position;
the reference values of the loudspeaker at all measurement positions are calculated by the method.
On the basis of the technical scheme, when the transmission frequency characteristic in the hall is measured, the average sound pressure level of the frequency within the range of 125-4000 Hz is measured.
On the basis of the technical scheme, when the transmission frequency characteristic in the hall is measured, the adopted measuring method is an electric input method or an acoustic input method.
On the basis of the technical scheme, the standard value of the sound transmission gain, the standard value of the maximum sound pressure level and the standard value of the sound field unevenness are-10 dB, 98dB and 8dB respectively.
On the basis of the technical scheme, the standard value of the transmission frequency characteristic is 0 dB.
In a second aspect, a debugging system for a hall audio-visual system is further provided, which comprises a processor and a plurality of test microphones, wherein the processor is respectively connected with the test microphones and the audio-visual system through signals;
the test microphone is used for detecting sound waves in the hall;
the processor is used for obtaining a measured value of the sound transmission gain, a measured value of the maximum sound pressure level, a measured value of the sound field unevenness and a measured value of the transmission frequency characteristic according to the sound wave detected by the test microphone, and obtaining a reference value according to the measured value of the sound transmission gain, the measured value of the maximum sound pressure level and the measured value of the sound field unevenness.
On the basis of the technical scheme, the debugging system further comprises a test amplifier, and the test amplifier is respectively connected with the processor and the test microphone and is used for amplifying the electric signals.
Compared with the prior art, the invention has the advantages that:
the debugging method for the hall audio-visual system can complete the selection of the optimal position of the loudspeaker by obtaining the measured value of the sound transmission gain, the measured value of the maximum sound pressure level, the measured value of the sound field unevenness and the corresponding reference value in the loudspeaker position adjusting range, so that the position of the loudspeaker meets the preset sound establishing requirement, and meanwhile, the parameters of the audio-visual system can meet the adjusting sound establishing requirement by adjusting the actual parameters of an audio processor and a parameter equalizer to the optimal values.
Drawings
Fig. 1 is a flow chart of a debugging method in the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, an embodiment of the present invention provides a debugging method for a hall audiovisual system, where the audiovisual system includes a speaker, an audio processor, and a parameter equalizer, and the debugging method includes the following steps:
setting measuring positions of a plurality of loudspeakers in a hall, and measuring the measured values of sound transmission gain, maximum sound pressure level and sound field unevenness of the loudspeakers at different measuring positions;
calculating reference values of the loudspeaker at different measuring positions according to the measured values of the sound transmission gain, the maximum sound pressure level and the sound field unevenness of the loudspeaker at different measuring positions, as well as the standard value of the sound transmission gain, the standard value of the maximum sound pressure level and the standard value of the sound field unevenness;
determining the loudspeaker measuring position with the minimum reference value as the optimal position, and setting the loudspeaker at the optimal position;
adjusting parameters of the audio processor and the parameter equalizer, and measuring the measured values of the transmission frequency characteristics in the hall corresponding to the parameters of the different audio processor and the parameter equalizer;
and taking the measured value with the minimum absolute value subtracted from the standard value of the transmission frequency characteristic in the measured transmission frequency characteristic measured values as the optimal value of the transmission frequency characteristic, and acquiring the parameters of the audio processor and the parameter equalizer corresponding to the optimal value of the transmission frequency characteristic as the actual parameters of the audio processor and the parameter equalizer.
When the sound transmission gain, the maximum sound pressure level, the sound field unevenness and the transmission frequency characteristic of the hall audio-visual system cannot meet preset requirements, the adjustment of the sound transmission gain, the maximum sound pressure level and the sound field unevenness is completed by adjusting the position of the loudspeaker, wherein the position adjustment of the loudspeaker comprises position adjustment of the position and the orientation in space, the position of the loudspeaker is adjusted to obtain a measured value of the sound transmission gain, a measured value of the maximum sound pressure level and a measured value of the sound field unevenness in an adjustment range, and a corresponding reference value is obtained according to the measured value of the sound transmission gain, the measured value of the maximum sound pressure level and the measured value of the sound field unevenness, so that the selection of the optimal position of the loudspeaker is completed, and the position of the loudspeaker meets the preset sound establishment requirement;
after the position of the loudspeaker is adjusted, parameters of the audio processor and the parameter equalizer are adjusted to obtain different transmission frequency characteristics, a transmission frequency characteristic measured value which is closest to a transmission frequency characteristic standard value is extracted as an optimal value, and actual parameters of the corresponding audio processor and the corresponding parameter equalizer are obtained, so that the parameters of the audio processor and the parameter equalizer are adjusted, namely when the actual parameters are the optimal transmission frequency characteristics, the audio processor and the parameter equalizer need to be adjusted correspondingly, the parameters of the audio-visual system can meet the sound establishment adjustment requirement, namely the sound establishment of the audio-visual system can meet the preset requirement through the position adjustment of the loudspeaker and the parameter adjustment of the audio processor and the parameter equalizer.
The method for measuring the sound transmission gain, the maximum sound pressure level and the sound field unevenness of the loudspeaker at different measurement positions specifically comprises the following steps:
uniformly selecting a plurality of measuring points in a hall;
a loudspeaker is arranged at a certain measuring position, and the measured values of the sound transmission gain, the maximum sound pressure level and the sound field unevenness among the plurality of measuring points are measured;
respectively averaging the measured values of the sound transmission gain, the maximum sound pressure level and the sound field unevenness of the plurality of measurement points to obtain a measured value of the sound transmission gain, a measured value of the maximum sound pressure level and a measured value of the sound field unevenness;
the above method is used to calculate the measured values of the sound transmission gain, the maximum sound pressure level and the sound field unevenness of the loudspeaker at all the measurement positions.
By selecting a plurality of measuring points, the accuracy of measuring the acoustic gain, the maximum sound pressure level and the sound field unevenness can be ensured.
Calculating reference values of the loudspeaker at different measuring positions, specifically comprising the following steps:
subtracting the measured value of the sound transmission gain, the measured value of the maximum sound pressure level and the measured value of the sound field unevenness of the loudspeaker at a certain measuring position from the standard value of the sound transmission gain, the standard value of the maximum sound pressure level and the standard value of the sound field unevenness respectively to obtain a difference value of the sound transmission gain, a difference value of the maximum sound pressure level and a difference value of the sound field unevenness, and averaging the difference value of the sound transmission gain, the difference value of the maximum sound pressure level and the absolute value of the difference value of the sound field unevenness to obtain a reference value of the loudspeaker at the measuring position;
the reference values of the loudspeaker at all measurement positions are calculated by the method.
Further, when the transmission frequency characteristic in the hall is measured, the average sound pressure level of the frequency within the range of 125-4000 Hz is measured; the adopted measuring method is an electrical input method or an acoustic input method;
wherein, the standard value of the sound transmission gain, the standard value of the maximum sound pressure level and the standard value of the sound field unevenness are respectively-10 dB, 98dB and 8 dB; the standard value of the transmission frequency characteristic is 0 dB.
The embodiment of the invention also provides a debugging system for the hall audio-visual system, which comprises a processor and a plurality of test microphones, wherein the processor is respectively connected with the test microphones and the audio-visual system through signals;
the test microphone is used for detecting sound waves in the hall and converting the sound waves into electric signals;
the processor is used for obtaining a measured value of the sound transmission gain, a measured value of the maximum sound pressure level, a measured value of the sound field unevenness and a measured value of the transmission frequency characteristic according to the sound wave detected by the test microphone, and obtaining a reference value according to the measured value of the sound transmission gain, the measured value of the maximum sound pressure level and the measured value of the sound field unevenness.
Detecting sound waves of a measuring point in a hall by a testing microphone, obtaining corresponding sound pressure levels by a processor, respectively generating the sound pressure levels corresponding to the sound waves when the sound transmission gain, the maximum sound pressure level, the sound field unevenness and the transmission frequency characteristic are measured according to an audio-visual system, obtaining a measured value of the sound transmission gain, a measured value of the maximum sound pressure level, a measured value of the sound field unevenness and a measured value of the transmission frequency characteristic, and completing the adjustment of the position of a loudspeaker and the adjustment of actual parameters of an audio processor and a parameter equalizer according to the measured value of the sound transmission gain, the measured value of the maximum sound pressure level, the measured value of the sound field unevenness and the measured value of the transmission frequency characteristic;
wherein, the measured value of the transmission gain is the difference value between the average value of the steady-state sound pressure level at each measuring point in the hall and the sound pressure level at the loudspeaker; the measured value of the maximum sound pressure level is the highest steady state peak sound pressure level generated at each measuring point in the hall; the measured value of the unevenness of the sound field is the difference of the steady-state sound pressure levels at different measuring points in the hall; the measured value of the transmission frequency characteristic is the amplitude-frequency response of the average value of steady-state sound pressure of each measuring point in the hall relative to the sound pressure at the loudspeaker or the voltage at the input end of the loudspeaker.
The debugging system also comprises a test amplifier which is respectively connected with the processor and the test microphone and used for amplifying the electric signals, and the signal power measured by the test microphone can be amplified through the arranged test amplifier, so that errors caused by small signal power when a measured value of the sound transmission gain, a measured value of the maximum sound pressure level, a measured value of the sound field unevenness and a measured value of the transmission frequency characteristic are calculated are avoided.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (8)
1. A commissioning method for a hall audiovisual system, said audiovisual system comprising a loudspeaker, an audio processor and a parameter equalizer, characterized in that said commissioning method comprises the steps of:
setting measuring positions of a plurality of loudspeakers in a hall, and measuring the measured values of sound transmission gain, maximum sound pressure level and sound field unevenness of the loudspeakers at different measuring positions;
calculating reference values of the loudspeaker at different measuring positions according to the measured values of the sound transmission gain, the maximum sound pressure level and the sound field unevenness of the loudspeaker at different measuring positions, as well as the standard value of the sound transmission gain, the standard value of the maximum sound pressure level and the standard value of the sound field unevenness;
determining the loudspeaker measuring position with the minimum reference value as the optimal position, and setting the loudspeaker at the optimal position;
adjusting parameters of the audio processor and the parameter equalizer, and measuring the measured values of the transmission frequency characteristics in the hall corresponding to the parameters of the different audio processor and the parameter equalizer;
taking the measured value with the minimum absolute value subtracted from the standard value of the transmission frequency characteristic in the measured values of the transmission frequency characteristic as the optimal value of the transmission frequency characteristic, and acquiring the parameters of the audio processor and the parameter equalizer corresponding to the optimal value of the transmission frequency characteristic as the actual parameters of the audio processor and the parameter equalizer;
calculating reference values of the loudspeaker at different measuring positions, specifically comprising the following steps:
subtracting the measured value of the sound transmission gain, the measured value of the maximum sound pressure level and the measured value of the sound field unevenness of the loudspeaker at a certain measuring position from the standard value of the sound transmission gain, the standard value of the maximum sound pressure level and the standard value of the sound field unevenness respectively to obtain a difference value of the sound transmission gain, a difference value of the maximum sound pressure level and a difference value of the sound field unevenness, and averaging the difference value of the sound transmission gain, the difference value of the maximum sound pressure level and the absolute value of the difference value of the sound field unevenness to obtain a reference value of the loudspeaker at the measuring position; the reference values of the loudspeaker at all measurement positions are calculated by the method.
2. A commissioning method for a hall audiovisual system according to claim 1, wherein the measurements of the sound transmission gain, the maximum sound pressure level and the sound field inhomogeneity of the loudspeakers at different measurement positions are measured, comprising the specific steps of:
uniformly selecting a plurality of measuring points in a hall;
a loudspeaker is arranged at a certain measuring position, and the measured values of the sound transmission gain, the maximum sound pressure level and the sound field unevenness among the plurality of measuring points are measured;
respectively averaging the measured values of the sound transmission gain, the maximum sound pressure level and the sound field unevenness of the plurality of measurement points to obtain a measured value of the sound transmission gain, a measured value of the maximum sound pressure level and a measured value of the sound field unevenness;
the above method is used to calculate the measured values of the sound transmission gain, the maximum sound pressure level and the sound field unevenness of the loudspeaker at all the measurement positions.
3. A commissioning method for a hall audiovisual system as recited in claim 1, wherein: when the transmission frequency characteristic in the hall is measured, the average sound pressure level of the measuring frequency within the range of 125-4000 Hz is measured.
4. A commissioning method for a hall audiovisual system as recited in claim 1, wherein: when the transmission frequency characteristic in the hall is measured, the adopted measuring method is an electric input method or an acoustic input method.
5. A commissioning method for a hall audiovisual system as recited in claim 1, wherein: the standard value of the sound transmission gain, the standard value of the maximum sound pressure level and the standard value of the sound field unevenness are-10 dB, 98dB and 8dB respectively.
6. A commissioning method for a hall audiovisual system as recited in claim 1, wherein: the standard value of the transmission frequency characteristic is 0 dB.
7. A commissioning system using the commissioning method for a hall audiovisual system as recited in claim 1, comprising a processor and a plurality of test microphones, said processor being in signal connection with said test microphones and said audiovisual system, respectively;
the test microphone is used for detecting sound waves in the hall;
the processor is used for obtaining a measured value of the sound transmission gain, a measured value of the maximum sound pressure level, a measured value of the sound field unevenness and a measured value of the transmission frequency characteristic according to the sound wave detected by the test microphone, and obtaining a reference value according to the measured value of the sound transmission gain, the measured value of the maximum sound pressure level and the measured value of the sound field unevenness.
8. The debugging system of claim 7 wherein: the debugging system also comprises a test amplifier which is respectively connected with the processor and the test microphone and is used for amplifying the electric signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911135280.6A CN110958554B (en) | 2019-11-19 | 2019-11-19 | Debugging method and debugging system for hall audio-visual system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911135280.6A CN110958554B (en) | 2019-11-19 | 2019-11-19 | Debugging method and debugging system for hall audio-visual system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110958554A CN110958554A (en) | 2020-04-03 |
| CN110958554B true CN110958554B (en) | 2021-06-04 |
Family
ID=69977710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911135280.6A Active CN110958554B (en) | 2019-11-19 | 2019-11-19 | Debugging method and debugging system for hall audio-visual system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110958554B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116405863B (en) * | 2023-06-08 | 2023-08-29 | 深圳东原电子有限公司 | Stage sound equipment fault detection method and system based on data mining |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414991A (en) * | 2013-05-21 | 2013-11-27 | 杭州联汇数字科技有限公司 | Self-adaptive adjustment method for indoor sound reinforcement system |
| CN106507261A (en) * | 2015-09-04 | 2017-03-15 | 音乐集团公司 | Method for determination or clarifying space relation in speaker system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG115665A1 (en) * | 2004-04-06 | 2005-10-28 | Sony Corp | Method and apparatus to generate an audio beam with high quality |
| CN103414990B (en) * | 2013-05-21 | 2016-02-10 | 杭州联汇数字科技有限公司 | Indoor sound reinforcement device detection method |
| CN106507240A (en) * | 2015-09-04 | 2017-03-15 | 音乐集团公司 | A kind of physical location of the speaker by speaker system is associated to the method for speaker identifier |
-
2019
- 2019-11-19 CN CN201911135280.6A patent/CN110958554B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414991A (en) * | 2013-05-21 | 2013-11-27 | 杭州联汇数字科技有限公司 | Self-adaptive adjustment method for indoor sound reinforcement system |
| CN106507261A (en) * | 2015-09-04 | 2017-03-15 | 音乐集团公司 | Method for determination or clarifying space relation in speaker system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110958554A (en) | 2020-04-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9565504B2 (en) | Speaker device | |
| US8223981B2 (en) | Wide dynamic range microphone | |
| US8577048B2 (en) | Self-calibrating loudspeaker system | |
| CN102655628B (en) | Device and method for detecting high sound pressure-phase shifting characteristic of microphone | |
| CN104125524A (en) | Sound effect adjustment method, apparatus and devices | |
| CN101513085A (en) | Identification method and apparatus in an audio system | |
| CN105516873A (en) | Device and method for testing sensitivity and frequency response curve of microphone | |
| EP1999996A1 (en) | Method and apparatus in an audio system | |
| CN104427441B (en) | Integrated audio signal processing circuit, audio system and the method for reducing cross-talk noise | |
| US11626850B2 (en) | Automated tuning by measuring and equalizing speaker output in an audio environment | |
| CN110958554B (en) | Debugging method and debugging system for hall audio-visual system | |
| CN107231597B (en) | Method and system for testing harmonic distortion value of loudspeaker | |
| GB2610708A (en) | System and method for evaluating an ear seal using normalization | |
| KR100638836B1 (en) | An automatic calibaration system for a sound level meter and the method thereof | |
| CN108776176B (en) | Method and system for measuring sound insulation quantity of sound insulation cover of reactor | |
| CN205040031U (en) | Microphone sensitivity and frequency response curve testing arrangement | |
| KR100965878B1 (en) | Apparatus and method for compensating the characteristic of speaker automatically | |
| KR101442797B1 (en) | Hearing aid calibrator | |
| US20100202624A1 (en) | Equipment, method and use of the equipment in an audio system | |
| CN115103266B (en) | Sound field equalization implementation method | |
| JP4737758B2 (en) | Audio signal processing method and playback apparatus | |
| CN102270454A (en) | method and device for improving audio output | |
| US20240007809A1 (en) | Microphone calibration method, in particular microphone for aeronautical use | |
| CN118225229A (en) | Noise monitoring device calibration verification system and method | |
| KR100650709B1 (en) | Meansurement system of noise with c-microphone |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |