CN102651842B - Generating device and method for random sound-pressure phase difference of microphone - Google Patents
Generating device and method for random sound-pressure phase difference of microphone Download PDFInfo
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- CN102651842B CN102651842B CN201210044567.XA CN201210044567A CN102651842B CN 102651842 B CN102651842 B CN 102651842B CN 201210044567 A CN201210044567 A CN 201210044567A CN 102651842 B CN102651842 B CN 102651842B
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Abstract
The invention relates to the technical field of acoustic metering and particularly discloses a generating device and method for the random sound-pressure phase difference of a microphone. In the generating device, a plurality of reference microphones are fixedly installed at one ends of a plurality of active coupling cavities in a way of one-to-one correspondence, the reference microphones are connected with a data collection card by a signal amplifier A, the data collection card is connected with a computer, and the signals of the active coupling cavities, which are detected by the reference microphones, are collected by the data collection card and are input into the computer after the signals are amplified by the signal amplifier A; and the computer is connected with the active coupling cavities by a multi-channel signal source and is used for controlling the signals input to the active coupling cavities by the multi-channel signal source. According to the generating device and the method, the synchronous control of the sound fields of a multi-channel microphone can be realized, random sound-pressure phase difference between every two channels is generated, and analog sound sources with various modes can be provided for calibrating a multi-channel acoustic testing system. According to the generating device and the method for the random sound-pressure phase difference of the microphone, the sound-pressure level control accuracy reaches 0.1dB, and the phase-difference control accuracy can reach 0.1 degree.
Description
Technical field
The invention belongs to acoustic metrology technical field, be specifically related to the poor generating means of any sound pressure phase of a kind of microphone and method.
Background technology
Microphone claims again " acoustic-electrical transducer ", is the converting means that acoustical signal in air is converted to the signal of telecommunication, and its sensitivity has phase characteristic.In recent years along with modern acoustics measuring technology development, there is acoustical holography analysis, sounding target localization, sounding accident analysis, the sound coupling analysis that shakes, the new technologies such as standing-wave-tube method material parameter analysis, the measuring system of these technology generally needs two above microphones, for example, in sounding target localization measuring system, due to the time delay feature of acoustic propagation, sound pressure amplitude and phase place that many microphones measure at diverse location have difference, multichannel measuring system can calculate the intensity of sound source by the relative position of microphone and the sound pressure phase information of many microphones, size, direction and distance, phase difference between the each passage of measuring system is the principal element that affects measurement result accuracy, not yet there is at present correlation technique can produce standard source, to reach the object of calibration multichannel acoustics measuring system.
Summary of the invention
The object of the present invention is to provide the poor generating means of any sound pressure phase of a kind of microphone and method, can realize the control of multiple channel acousto field synchronization, there is any sound pressure amplitude and phase difference between each passage, standard source simulation and the phase difference synchronous calibration problem of Solving Multichannel measuring system.
Technical scheme of the present invention is as follows: the poor method for generation of any sound pressure phase of a kind of microphone, the method specifically comprises the steps:
Step 1, M microphone of multichannel acoustics measuring system is arranged on respectively to one end of M active coupling cavity, M with reference to the microphone corresponding other end that is arranged on active coupling cavity one by one respectively, wherein, and M ∈ (2,30);
Step 2, according to the relative coordinate between M microphone of multichannel acoustics measuring system, simulation sound source, with respect to coordinate and the radiation intensity thereof of M microphone, is calculated the sound pressure amplitude P of M microphone present position of acquisition
nwith phase
n(n=1,2 ..., M);
Step 3, utilization drive active coupling cavity to produce sound pressure signal by data collecting card, signal amplifier A with M the computer control multi channel signals source being connected with reference to microphone, monitor sound pressure amplitude and the phase place in active coupling cavity with reference to microphone for M, feed back to computer by signal amplifier A and data collecting card, form M independently FEEDBACK CONTROL closed loop, sound pressure amplitude and phase place in the active coupling cavity of computer control equal the result of calculation P in step 2
n, φ
n(n=1,2 ..., M);
Step 4, M microphone being connected with multichannel acoustics measuring system by signal amplifier B are now under simulation sound source environment, the parameters of simulation sound source is all known, can relatively realize the Measurement and calibration of the simulation sound source to this system by the result of measuring with multichannel acoustics measuring system.
The poor generating means of a kind of any sound pressure phase of microphone, this generating means comprises several active coupling cavitys, several are with reference to microphone, computer and multi channel signals source, wherein, several are with reference to microphone corresponding one end that is fixedly mounted on several active coupling cavitys one by one, several are connected with data collecting card by signal amplifier A with reference to microphone, data collecting card is connected with computer, the signal of several active coupling cavitys will be detected with reference to microphone by several, after signal amplifier A amplifies, by data collecting card Gather and input in computer, computer is connected by the active coupling cavity of multi channel signals source and several, controls the signal that is input to several active coupling cavitys by multi channel signals source.
Several described active coupling cavitys are provided with several other ends with reference to microphone and are installed with several microphones, several microphones are connected with multichannel acoustics measuring system by signal amplifier B, sound pressure amplitude by several active coupling cavitys of computer control and phase place and preset value are in full accord, thereby provide known standard source simulation for multichannel acoustics measuring system.
Described multi channel signals source is made up of some 33220A type function generators, and each channel signal that multi channel signals source produces is produced by a 3320A type function generator separately.
Described data collecting card is NI-PCI-4472 dynamic signal acquisition card.
Remarkable result of the present invention is: the poor generating means of any sound pressure phase of a kind of microphone of the present invention and method, can realize multichannel microphone sound source Synchronization Control, occur between each passage that sound pressure phase is poor arbitrarily, can be calibration multichannel acoustics test macro provides the simulation sound source of various patterns; Meanwhile, sound pressure level control precision reaches 0.1dB, and phase difference control precision can reach 0.1 °.
Brief description of the drawings
Fig. 1 is the poor generating means schematic diagram of any sound pressure phase of a kind of microphone of the present invention;
In figure: 1, microphone; 2, active coupling cavity; 3, with reference to microphone; 4, signal amplifier A; 5, data collecting card; 6, computer; 7, multi channel signals source; 8, multichannel acoustics measuring system; 9, signal amplifier B.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in Figure 1, the poor generating means of a kind of any sound pressure phase of microphone, comprise several active coupling cavitys 2, several are with reference to microphone 3, computer 6 and multi channel signals source 7, wherein, several are with reference to microphone 3 corresponding one end that is fixedly mounted on several active coupling cavitys 2 one by one, several are connected with data collecting card 5 by signal amplifier A4 with reference to microphone 3, data collecting card 5 is connected with computer 6, the signal of several active coupling cavitys 2 will be detected with reference to microphone 3 by several, after signal amplifier A4 amplifies, by data collecting card 5 Gather and inputs in computer 6, computer 6 is connected by the active coupling cavity 2 of multi channel signals source 7 and several, controls the signal that is input to several active coupling cavitys 2 by multi channel signals source 7.
The poor generating means specific works of any sound pressure phase of a kind of microphone of the present invention process is: by 3 microphones 1 that are connected with multichannel acoustics measuring system 8 by signal amplifier B9 other end of 3 active coupling cavitys 2 of corresponding fixed installation one by one, make 3 microphones 1 with 3 with reference to the microphone 3 corresponding two ends that are arranged on active coupling cavity 2 one by one; Computer 6 is inputted default acoustic pressure by controlling multi channel signals source 7 to 3 active coupling cavitys 2, monitor 3 sound pressure amplitude and phase places in active coupling cavity 2 with reference to microphone 3 for 3, after signal amplifier A4 and data collecting card 5, feed back to computer 6, form 3 independently FEEDBACK CONTROL closed loops, computer 6 is controlled multi channel signals source 7, makes 3 sound pressure amplitude and phase places in active coupling cavity 2 reach preset value, thereby simulates for multichannel acoustics measuring system 8 provides standard source.
Embodiment 1
The poor method for generation of a kind of any sound pressure phase of microphone, the method specifically comprises the steps:
Step 1,3 microphones 1 of multichannel acoustics measuring system 8 are arranged on respectively to one end of 3 active coupling cavitys 2,3 with reference to the microphone 3 corresponding other end that is arranged on active coupling cavity 2 one by one respectively;
Step 2, according to the relative coordinate between 3 microphones 1 of multichannel acoustics measuring system 8, simulation points sound source is with respect to coordinate and the radiation intensity thereof of 3 microphones 1, calculates the sound pressure amplitude P that obtains 3 microphone 1 present positions
nwith phase
n(n=1,2,3);
Step 3, utilization are controlled multi channel signals source 7 by data collecting card 5, signal amplifier A4 with 3 computers that are connected with reference to microphone 36 and are driven active coupling cavity 2 to produce sound pressure signal, monitor sound pressure amplitude and the phase place in active coupling cavity 2 with reference to microphone 3 for 3, feed back to computer 6 by signal amplifier A4 and data collecting card 5, form 3 independently FEEDBACK CONTROL closed loops, sound pressure amplitude and phase place that computer 6 is controlled in active coupling cavity 2 equal the result of calculation P in step 2
n, φ
n(n=1,2,3);
Step 4,3 microphones 1 being connected with multichannel acoustics measuring system 8 by signal amplifier B9 are now under the point sound source environment in simulation, position and the radiation intensity of point sound source are known, can relatively realize the point sound source Measurement and calibration to this system by the result of measuring with multichannel acoustics measuring system 8.
Embodiment 2
The poor method for generation of a kind of any sound pressure phase of microphone, the method specifically comprises the steps:
Step 1,6 microphones 1 of multichannel acoustics measuring system 8 are arranged on respectively to one end of 6 active coupling cavitys 2,6 with reference to the microphone 3 corresponding other end that is arranged on active coupling cavity 2 one by one respectively;
Step 2, according to the relative coordinate between 6 microphones 1 of multichannel acoustics measuring system 8, the size of simulation spherical source, with respect to coordinate and the radiation intensity thereof of 6 microphones 1, calculates the sound pressure amplitude P that obtains 6 microphone 1 present positions
nwith phase
n(n=1,2 ..., 6);
Step 3, utilization are controlled multi channel signals source 7 by data collecting card 5, signal amplifier A4 with 6 computers that are connected with reference to microphone 36 and are driven active coupling cavity 2 to produce sound pressure signal, monitor sound pressure amplitude and the phase place in active coupling cavity 2 with reference to microphone 3 for 6, feed back to computer 6 by signal amplifier A4 and data collecting card 5, form 6 independently FEEDBACK CONTROL closed loops, sound pressure amplitude and phase place that computer 6 is controlled in active coupling cavity 2 equal the result of calculation P in step 2
n, φ
n(n=1,2 ..., 6);
Step 4,6 microphones 1 being connected with multichannel acoustics measuring system 8 by signal amplifier B9 are now under the spherical source environment in simulation, size, position and the radiation intensity of spherical source are known, can relatively realize the spherical source Measurement and calibration to this system by the result of measuring with multichannel acoustics measuring system 8.
Embodiment 3
The poor method for generation of a kind of any sound pressure phase of microphone, the method specifically comprises the steps:
Step 1, N microphone 1 of multichannel acoustics measuring system 8 is arranged on respectively to one end of N active coupling cavity 2, N with reference to the microphone 3 corresponding other end that is arranged on active coupling cavity 2 one by one respectively, wherein, and N ∈ (6,30);
Step 2, according to the relative coordinate between N microphone 1 of multichannel acoustics measuring system 8, the diameter, spacing in simulation dipole ball source, with respect to coordinate and the radiation intensity thereof of N microphone 1, calculate the sound pressure amplitude P of N microphone 1 present position of acquisition
nwith phase
n(n=1,2 ..., N);
Step 3, utilization are controlled multi channel signals source 7 by data collecting card 5, signal amplifier A4 with N the computer 6 being connected with reference to microphone 3 and are driven active coupling cavity 2 to produce sound pressure signal, monitor sound pressure amplitude and the phase place in active coupling cavity 2 with reference to microphone 3 for N, feed back to computer 6 by signal amplifier A4 and data collecting card 5, form N independently FEEDBACK CONTROL closed loop, sound pressure amplitude and phase place that computer 6 is controlled in active coupling cavity 2 equal the result of calculation P in step 2
n, φ
n(n=1,2 ..., N);
Step 4, N microphone 1 being connected with multichannel acoustics measuring system 8 by signal amplifier B9 are now under the spherical source environment in simulation, diameter, spacing, position and the radiation intensity of spherical source are known, can relatively realize the dipole ball source Measurement and calibration to this system by the result of measuring with multichannel acoustics measuring system 8.
Claims (4)
1. the poor method for generation of any sound pressure phase of microphone, is characterized in that: the method specifically comprises the steps:
Step 1, M the microphone (1) of multichannel acoustics measuring system (8) is arranged on respectively to one end of M active coupling cavity (2), M with reference to microphone (3) respectively one by one correspondence be arranged on the other end of active coupling cavity (2), wherein, M ∈ (2,30);
Step 2, according to the relative coordinate between M the microphone (1) of multichannel acoustics measuring system (8), simulation sound source, with respect to coordinate and the radiation intensity thereof of M microphone (1), is calculated the sound pressure amplitude P that obtains M microphone (1) present position
nwith phase
n(n=1,2 ..., M);
Step 3, utilize by data collecting card (5), signal amplifier A (4) controls multi channel signals source (7) with M the computer (6) being connected with reference to microphone (3) and drives active coupling cavity (2) to produce sound pressure signal, monitor sound pressure amplitude and the phase place in active coupling cavity (2) with reference to microphone (3) for M, feed back to computer (6) by signal amplifier A (4) and data collecting card (5), form M independently FEEDBACK CONTROL closed loop, sound pressure amplitude and phase place that computer (6) is controlled in active coupling cavity (2) equal the result of calculation P in step 2
n, φ
n(n=1,2 ..., M),
Step 4, M the microphone (1) that be connected with multichannel acoustics measuring system (8) by signal amplifier B (9) are now under simulation sound source environment, the parameters of simulation sound source is all known, can relatively realize the Measurement and calibration of the simulation sound source to this system by the result of measuring with multichannel acoustics measuring system (8).
2. the poor generating means of any sound pressure phase of microphone, it is characterized in that: this generating means comprises several active coupling cavitys (2), several are with reference to microphone (3), computer (6) and multi channel signals source (7), wherein, several with reference to microphone (3) one by one correspondence be fixedly mounted on one end of several active coupling cavitys (2), several are connected with data collecting card (5) by signal amplifier A (4) with reference to microphone (3), data collecting card (5) is connected with computer (6), signal of several active coupling cavitys (2) to be detected by several with reference to microphone (3), after signal amplifier A (4) amplifies, by data collecting card (5) Gather and input in computer (6), computer (6) is connected with several active coupling cavitys (2) by multi channel signals source (7), controls the signal that is input to several active coupling cavitys (2) by multi channel signals source (7), several described active coupling cavitys (2) are provided with several other ends with reference to microphone (3) and are installed with several microphones (1), several microphones (1) are connected with multichannel acoustics measuring system (8) by signal amplifier B (9), control the sound pressure amplitude of several active coupling cavitys (2) and phase place and preset value by computer (6) in full accord, thereby provide known standard source simulation for multichannel acoustics measuring system (8).
3. the poor generating means of any sound pressure phase of a kind of microphone according to claim 2, it is characterized in that: described multi channel signals source (7) is made up of some 33220A type function generators, each channel signal that multi channel signals source (7) produce is produced by a 3320A type function generator separately.
4. the poor generating means of any sound pressure phase of a kind of microphone according to claim 2, is characterized in that: described data collecting card (5) is NI-PCI-4472 dynamic signal acquisition card.
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| CN201210044567.XA CN102651842B (en) | 2012-02-23 | 2012-02-23 | Generating device and method for random sound-pressure phase difference of microphone |
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| CN201210044567.XA CN102651842B (en) | 2012-02-23 | 2012-02-23 | Generating device and method for random sound-pressure phase difference of microphone |
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| CN102651842B true CN102651842B (en) | 2014-12-10 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2909198Y (en) * | 2005-07-11 | 2007-06-06 | 中国船舶重工集团公司第七一一研究所 | Sound field measuring instrument using transmission method |
| CN101895809A (en) * | 2010-07-01 | 2010-11-24 | 北京航空航天大学 | Microphone calibrator and calibration method thereof |
| CN202488714U (en) * | 2012-02-23 | 2012-10-10 | 北京航天计量测试技术研究所 | Generation device for any phase difference of sound pressure of microphones |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2909198Y (en) * | 2005-07-11 | 2007-06-06 | 中国船舶重工集团公司第七一一研究所 | Sound field measuring instrument using transmission method |
| CN101895809A (en) * | 2010-07-01 | 2010-11-24 | 北京航空航天大学 | Microphone calibrator and calibration method thereof |
| CN202488714U (en) * | 2012-02-23 | 2012-10-10 | 北京航天计量测试技术研究所 | Generation device for any phase difference of sound pressure of microphones |
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