CN206865745U - A kind of condenser microphone frequency response measurement system - Google Patents
A kind of condenser microphone frequency response measurement system Download PDFInfo
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- CN206865745U CN206865745U CN201720510286.7U CN201720510286U CN206865745U CN 206865745 U CN206865745 U CN 206865745U CN 201720510286 U CN201720510286 U CN 201720510286U CN 206865745 U CN206865745 U CN 206865745U
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- frequency response
- electric capacity
- response measurement
- condenser microphone
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Abstract
The utility model has opened a kind of condenser microphone frequency response measurement system.Belong to condenser microphone frequency response measurement technical field, frequency response measurement efficiency high.Including DC voltage source module, resistance, electric capacity and No.1 node, it is characterized in that, also include No. two nodes, swept signal generator, multi-channel signal acquiring instrument, computer and the test desk provided with preamplifier, on the upper surface of test desk upwards be provided with can vertical lifting support, electrostatic actuator is provided with support, and the upper surface of the rigid conductive plate of electrostatic actuator and test desk is arranged in parallel；One end of one end of resistance, electrostatic actuator and electric capacity is all connected on No.1 node, the No.1 collection terminal of swept signal generator, the electric capacity other end and multi-channel signal acquiring instrument is all connected on No. two nodes, the other end of resistance is connected with DC voltage source module, preamplifier is connected with No. two collection terminals of multi-channel signal acquiring instrument, and the output end of multi-channel signal acquiring instrument is connected with computer.
Description
Technical field
It the utility model is related to condenser microphone frequency response measurement technical field, and in particular to a kind of condenser microphone frequency response is surveyed
Amount system.
Background technology
The former vertification regulation of frequency response measurement is carried out to condenser microphone at present as shown in figure 1, DC voltage source module provides
800V DC voltages are acted on electrostatic actuator, are provided quiescent biasing for static excitation response, are carried sinusoidal signal generator
The AC signal of confession is operated in linear zone.Sinusoidal signal generator occurs successively according to the Frequency point to be measured, and is swashed by electrostatic
Encourage device and produce electrostatic force on microphone is detected.The response signal of microphone is detected by preamplifier, measurement
Amplifier, electrostatic response of the Frequency point under given amplitude is obtained eventually through digital voltmeter.To all Frequency points
After measurement, typically using 250Hz as reference point, final frequency response is calculated.But measurement efficiency is too low in actual use.It is transaudient
Device frequency response at least provides the 1/3OCT frequencies between 20Hz~20kHz, that is, at least more than 30 individual Frequency point frequency response data, such as
It is bigger that fruit with 1/12OCT frequency provides then workload.Measured in strict accordance with the requirement of a frequency, be unrealistic in many cases
, frequency response measurement it is less efficient.
Utility model content
Above shortcomings when the utility model is to solve the existing progress frequency response measurement to condenser microphone, there is provided
A kind of simple in construction, measurement accuracy is high, and anti-interference is good, a kind of condenser microphone frequency response measurement system of frequency response measurement efficiency high
System.
Above technical problem is that solved by following technical proposal：
A kind of condenser microphone frequency response measurement system, including DC voltage source module, resistance, electric capacity and No.1 node, its
It is characterised by, in addition to No. two nodes, swept signal generator, multi-channel signal acquiring instrument, computer and provided with preposition amplification
The test desk of device, on the upper surface of test desk upwards be provided with can vertical lifting support, electrostatic actuator is provided with support,
And the rigid conductive plate of electrostatic actuator and the upper surface of test desk are arranged in parallel；One end of the resistance, electrostatic actuator
All it is connected on No.1 node with one end of electric capacity, the swept signal generator, the electric capacity other end and multi-channel signal acquiring
The No.1 collection terminal of instrument is all connected on No. two nodes, and the other end of the resistance is connected with DC voltage source module, before described
Put amplifier to connect with No. two collection terminals of multi-channel signal acquiring instrument, output end and the computer of multi-channel signal acquiring instrument connect
Connect.
This programme has mainly done 3 aspects and changed compared with the instrumentation plan that former vertification regulation provides：
First, substituting original sinusoidal signal generator using swept signal generator carries out static excitation, a frequency sweep is then
The measurement of all frequencies can be completed.
Second, substituting former measuring amplifier using multi-channel signal acquiring instrument, the electrostatic that binary channels gathers microphone simultaneously swashs
Encourage response signal and swept-frequency signal.Compared by binary channels, reduce the stand-by period of signal stabilization, while the signal hair that can forgo
The frequency response error of raw device.
Third, the transmission using PC software real-time trackings swept frequency, progress narrow band analyzing, two channel datas of calculating responds,
Replace the digital voltmeter used in former code.By narrow band detection, the interference free performance of system is improved.
This programme is simple in construction, improves measurement accuracy, improves anti-interference, frequency response measurement efficiency high.
Preferably, the left end of a horizontal cross bar is fixed on support, the pedestal of a motor is fixed on the level
The right-hand member of cross bar, and the rotating shaft of motor is arranged straight down, and electrostatic can be fixed by, which being fixed with the rotating shaft lower end of motor, swashs
Encourage the fixed mount of device.
Allow electrostatic actuator to rotate in measurement, the precision and reliability of detection can be greatly improved.
Preferably, also including microcontroller, the control terminal and computer of motor are connected with microcontroller respectively.
First by computer to micro-controller instructions, then by microcontroller to motor command, the rotation of controlled motor, automation
Degree is high, good reliability.
Preferably, the electric capacity is filter capacitor.
The utility model can reach following effect：
This practical new construction is simple, improves measurement accuracy, improves anti-interference, frequency response measurement efficiency high.
Brief description of the drawings
Fig. 1 is a kind of instrumentation plan of former vertification regulation.
Fig. 2 is a kind of instrumentation plan of the utility model vertification regulation.
Fig. 3 is a kind of attachment structure schematic diagram at the utility model support.
Fig. 4 is a kind of attachment structure schematic diagram that microcontroller is connected with computer and motor respectively.
Embodiment
The utility model is further described with embodiment below in conjunction with the accompanying drawings.
Embodiment, a kind of condenser microphone frequency response measurement system, referring to shown in Fig. 2, Fig. 3, Fig. 4, including direct voltage source
Module 1, resistance 2, electric capacity 4 and No.1 node 19, in addition to No. two nodes 20, swept signal generator, multi-channel signal acquirings
Instrument, computer and the test desk provided with preamplifier 6, on the upper surface of test desk upwards be provided with can vertical lifting support
13, electrostatic actuator 5, and the rigid conductive plate of electrostatic actuator cloth parallel with the upper surface of test desk are provided with support
Put；One end of one end of the resistance, electrostatic actuator and electric capacity is all connected on No.1 node, and the swept-frequency signal occurs
The No.1 collection terminal of device, the electric capacity other end and multi-channel signal acquiring instrument is all connected on No. two nodes, the resistance it is another
End is connected with DC voltage source module, and the preamplifier connects with No. two collection terminals of multi-channel signal acquiring instrument, more logical
The output end of road signal sampler is connected with computer.The electric capacity is filter capacitor.
The left end of a piece horizontal cross bar 14 is fixed on support, and the pedestal 15 of a motor 21 is fixed on the horizontal cross bar
Right-hand member, and the rotating shaft 16 of motor is arranged straight down, and static excitation can be fixed by being fixed with the rotating shaft lower end of motor
The fixed mount 17 of device.Also include microcontroller 22, the control terminal and computer of motor are connected with microcontroller respectively.
The present embodiment when in use, detected microphone 9 is placed on test desk 18.Use swept signal generator 10
Substitute original sinusoidal signal generator 3 and carry out static excitation, a frequency sweep can then complete the measurement of all frequencies.Using more logical
Road signal sampler 11 replaces measuring amplifier 7.Former measuring amplifier is substituted with multi-channel signal acquiring instrument, binary channels is adopted simultaneously
Collect the static excitation response signal and swept-frequency signal of microphone.Compared by binary channels, reduce the stand-by period of signal stabilization,
While the frequency response error for the signal generator that can forgo.Digital voltmeter 8 is replaced with computer 12, is provided with PC points in a computer
Analyse software.Using computer real-time tracking swept frequency, the transmission response for carrying out narrow band analyzing, calculating two channel datas, replace
The digital voltmeter used in former code.By narrow band detection, the interference free performance of system is improved.The letter of the present embodiment structure
It is single, improve measurement accuracy, improve anti-interference, frequency response measurement efficiency high.
Do not limited when describing embodiment of the present utility model above in conjunction with accompanying drawing, but realizing by above-described embodiment, this
Field those of ordinary skill can make a variety of changes or change within the scope of the appended claims.
Claims (4)
1. a kind of condenser microphone frequency response measurement system, including DC voltage source module, resistance, electric capacity and No.1 node, it is special
Sign is, in addition to No. two nodes, swept signal generator, multi-channel signal acquiring instrument, computer and provided with preamplifier
Test desk, on the upper surface of test desk upwards be provided with can vertical lifting support, electrostatic actuator is provided with support, and
And the rigid conductive plate of electrostatic actuator and the upper surface of test desk are arranged in parallel；One end of the resistance, electrostatic actuator and
One end of electric capacity is all connected on No.1 node, the swept signal generator, the electric capacity other end and multi-channel signal acquiring instrument
No.1 collection terminal be all connected on No. two nodes, the other end of the resistance is connected with DC voltage source module, described preposition
Amplifier connects with No. two collection terminals of multi-channel signal acquiring instrument, and output end and the computer of multi-channel signal acquiring instrument connect
Connect.
2. a kind of condenser microphone frequency response measurement system according to claim 1, it is characterised in that horizontal cross bar
Left end is fixed on support, and the pedestal of a motor is fixed on the right-hand member of the horizontal cross bar, and the rotating shaft of motor vertically to
Lower arrangement, the fixed mount that can fix electrostatic actuator is fixed with the rotating shaft lower end of motor.
3. a kind of condenser microphone frequency response measurement system according to claim 2, it is characterised in that also including microcontroller
Device, the control terminal and computer of motor are connected with microcontroller respectively.
4. a kind of condenser microphone frequency response measurement system according to claim 1, it is characterised in that the electric capacity is filtering
Electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720510286.7U CN206865745U (en) | 2017-05-09 | 2017-05-09 | A kind of condenser microphone frequency response measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720510286.7U CN206865745U (en) | 2017-05-09 | 2017-05-09 | A kind of condenser microphone frequency response measurement system |
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| Publication Number | Publication Date |
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| CN206865745U true CN206865745U (en) | 2018-01-09 |
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| CN201720510286.7U Active CN206865745U (en) | 2017-05-09 | 2017-05-09 | A kind of condenser microphone frequency response measurement system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108989963A (en) * | 2018-07-11 | 2018-12-11 | 杭州爱华仪器有限公司 | A kind of multifrequency point static excitation calibrating installation and its working method |
| CN110007160A (en) * | 2019-03-15 | 2019-07-12 | 山东超越数控电子股份有限公司 | A kind of Electrostatic Potential Measure System, method and equipment |
| CN112291692A (en) * | 2020-10-13 | 2021-01-29 | 皓骏科技(北京)有限公司 | Detection device |
-
2017
- 2017-05-09 CN CN201720510286.7U patent/CN206865745U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108989963A (en) * | 2018-07-11 | 2018-12-11 | 杭州爱华仪器有限公司 | A kind of multifrequency point static excitation calibrating installation and its working method |
| CN110007160A (en) * | 2019-03-15 | 2019-07-12 | 山东超越数控电子股份有限公司 | A kind of Electrostatic Potential Measure System, method and equipment |
| CN112291692A (en) * | 2020-10-13 | 2021-01-29 | 皓骏科技(北京)有限公司 | Detection device |
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