CN204101170U - Hummer testing circuit - Google Patents
Hummer testing circuit Download PDFInfo
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- CN204101170U CN204101170U CN201420403974.XU CN201420403974U CN204101170U CN 204101170 U CN204101170 U CN 204101170U CN 201420403974 U CN201420403974 U CN 201420403974U CN 204101170 U CN204101170 U CN 204101170U
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Abstract
The utility model belongs to field of electronics, particularly relates to a kind of hummer testing circuit.Specifically, the acoustic-electric conversion unit, signal amplification unit, bandpass filtering unit and the single-chip microcomputer judging unit that connect successively is comprised.According to the hummer testing circuit that the utility model provides, first the sound that hummer sends is converted into electric signal (current signal or voltage transformation signal) by acoustic-electric conversion unit, again after the amplification filtering of signal amplification unit and bandpass filtering unit, export the electric signal consistent with the bass signal of hummer to carry out sampling to single-chip microcomputer judging unit and judge, thus judge the quality of hummer, achieve the automatic detection of hummer.
Description
Technical field
The utility model belongs to field of electronics, particularly relates to a kind of hummer testing circuit.
Background technology
In the production run of current electron trade electronic controller, the production testing of the microphone devices such as hummer is substantially all sound judging quality by artitificial ear, but all there is the larger problem of noise ratio in the production environment in general workshop, and the sound of the microphone devices such as hummer is also smaller, so the fault recall rate in production run is very low, the key property of product can not be ensured completely.For this kind of situation, be badly in need of the testing circuit of a kind of microphone device for small volumes such as hummers of design, use the mode automatically detected to carry out sound detection, to reach desirable fault detection criteria.
Utility model content
Namely the purpose of this utility model is to provide a kind of hummer testing circuit, carries out sound detection, reach the fault detection criteria of production run middle ideal by the mode automatically detected.
Hummer testing circuit that the utility model provides, comprises and connecting successively:
Acoustic-electric conversion unit, for gathering the sound that hummer sends, and is translated into electric signal;
Signal amplification unit, for carrying out amplification process by described electric signal;
Bandpass filtering unit, carries out bandpass filtering for the electric signal exported described signal amplification unit; And
Single-chip microcomputer judging unit, for carrying out sampling processing to the electric signal through bandpass filtering, judges the quality of described hummer with this.
Further, described acoustic-electric conversion unit comprises a microphone.
Further, described microphone is electret microphone, first output terminal of described electret microphone connects positive source through a resistance R1, first output terminal of described electret microphone also connects the input end of described signal amplification unit, the second output head grounding of described electret microphone simultaneously by an electric capacity C1.
Further, described acoustic-electric conversion unit also comprises an electrochemical capacitor E1 be serially connected between described positive source and ground.
Further, described signal amplification unit comprises NPN type triode Q1 and biasing resistor R4; The base stage of described NPN type triode Q1 is the input end of described signal amplification unit, the grounded emitter of described NPN type triode Q1, the output terminal of the very described signal amplification unit of current collection of described NPN type triode Q1, connect the input end of positive source and described bandpass filtering unit simultaneously, described biasing resistor R4 be connected to described NPN type triode Q1 base stage and collector between.
Further, described signal amplification unit also comprises the current-limiting resistance R2 between a collector being connected to described positive source and described NPN type triode Q1.
Further, described bandpass filtering unit comprises electric capacity C2, electric capacity C3, resistance R3 and resistance R5; Described resistance R3 is connected between the output terminal of described signal amplification unit and the first end of described electric capacity C3, resistance R5 described in second termination of described electric capacity C3, between the first end that described electric capacity C2 is connected to described electric capacity C3 and ground, the connecing altogether of described resistance R5 and described electric capacity C3 hold for described pass filtering unit output terminal, connect described single-chip microcomputer judging unit.
Further, described bandpass filtering unit also comprises an electrochemical capacitor E2; Described electrochemical capacitor E2 is connected between the output terminal of described signal amplification unit and described resistance R3.
Further, the enlargement factor of described NPN type triode Q1 is between 110 times to 150 times.
According to the hummer testing circuit that the utility model provides, first the sound that hummer etc. sends is converted into electric signal (current signal or voltage transformation signal), again after amplification filtering, export the electric signal consistent with the bass signal of the hummer collected to carry out sampling to single-chip microcomputer and judge, thus judge the quality of hummer, realize the automatic detection of hummer.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the hummer testing circuit that the utility model provides;
Fig. 2 is the electronics exemplary plot of the hummer testing circuit that the utility model one preferred embodiment provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 1 is the structured flowchart of the hummer testing circuit that the utility model provides; For convenience of explanation, illustrate only part related to the present embodiment, as shown in the figure:
Hummer testing circuit, comprises the acoustic-electric conversion unit 10, signal amplification unit 20, bandpass filtering unit 30 and the single-chip microcomputer judging unit 40 that connect successively.Wherein, the sound that acoustic-electric conversion unit 10 sends for gathering hummer, and be translated into electric signal; Signal amplification unit 20 is for carrying out amplification process by described electric signal; Bandpass filtering unit 30 carries out bandpass filtering for the electric signal exported described signal amplification unit; Single-chip microcomputer judging unit 40 in the end for carrying out sampling processing to the electric signal through bandpass filtering, judges the quality of described hummer with this.
Like this, hummer testing circuit according to Fig. 1, first the sound that hummer sends is converted into electric signal (current signal or voltage transformation signal) by acoustic-electric conversion unit 10, again after the amplification filtering of signal amplification unit 20 and bandpass filtering unit 30, export the electric signal consistent with the bass signal of hummer to carry out sampling to single-chip microcomputer judging unit 40 and judge, thus judge the quality of hummer, achieve the automatic detection of hummer.
Fig. 2 is the electronics exemplary plot of the hummer testing circuit that the utility model one preferred embodiment provides.For convenience of explanation, illustrate only part related to the present embodiment, as shown in the figure:
Acoustic-electric conversion unit 10 comprises a microphone B1.When specific implementation, microphone B1 selects common microphone just.In the present embodiment, as preferably, this microphone B1 selects electret microphone, first output terminal of electret microphone connects+5V positive source through a resistance R1, first output terminal of electret microphone also connects the input end of signal amplification unit 20, the second output head grounding of electret microphone simultaneously by an electric capacity C1.
Further, acoustic-electric conversion unit 10 also comprises an electrochemical capacitor E1 be serially connected between+5v positive source and ground, plays the effect of energy storage, voltage stabilizing.
Signal amplification unit 20 mainly comprises NPN type triode Q1 and biasing resistor R4; The base stage of NPN type triode Q1 be signal amplification unit 20 input end, meet electric capacity C1, the grounded emitter of NPN type triode Q1, the current collection of NPN type triode Q1 very signal amplification unit 20 output terminal, connect the input end of+5V positive source and bandpass filtering unit 30 simultaneously, biasing resistor R4 be connected to NPN type triode Q1 base stage and collector between.When specific implementation, the best magnification of the NPN type triode Q1 selected is between 110 times to 150 times.
Further, signal amplification unit 20 also comprises one and is connected to current-limiting resistance R2 between+5V positive source and the collector of NPN type triode Q1.
Bandpass filtering unit 30 comprises electric capacity C2, electric capacity C3, resistance R3 and resistance R5; Resistance R3 is connected between the output terminal of signal amplification unit 20 and the first end of electric capacity C3, the second terminating resistor R5 of electric capacity C3, between the first end that electric capacity C2 is connected to electric capacity C3 and ground, the connecing altogether of resistance R5 and electric capacity C3 hold for bandpass filtering unit 30 output terminal, connect single-chip microcomputer judging unit 40.
Further, bandpass filtering unit 40 also comprises an electrochemical capacitor E2; This electrochemical capacitor E2 is connected between the output terminal of signal amplification unit 30 and resistance R3.
In specific implementation process, all resistance can select same model, and electrochemical capacitor E1 and E2 the most handy short electric capacity, consider that the capacity ratio of 100uF is higher, volume is also a little large, generally can select 47uF's.
Below for the hummer testing circuit that this preferred embodiment provides, brief description is carried out to its principle of work.First microphone B1 is utilized to replace people's ear, for receiving the voice signal of hummer, current signal is converted into again according to the frequency change of voice signal, then the change in voltage at electric capacity C1 two ends is converted into, change in voltage feeds back to the base stage of NPN type triode Q1 by C1, then by the amplification of NPN type triode Q1, voltage signal is fed back to collector, the collector voltage of NPN type triode Q1 is coupled to resistance R3 and resistance R5 by electrochemical capacitor E2 again, and then pass through the filter action of electric capacity C2 and electric capacity C3, between resistance R3 and resistance R5, export the voltage signal consistent with the low voice signal of the hummer that microphone B1 collects supply single-chip microcomputer and sample, thus realize the automatic detection of hummer.Other, as resistance R1 and resistance R2 etc., are all the effects of current limliting or voltage stabilizing, just repeat no more at this.
In fact, according to the hummer testing circuit that the utility model embodiment provides, also may be used for detecting other microphone devices, as long as the component parameter of signal amplification unit and bandpass filtering unit is modified and is matched, single-chip microcomputer judging unit is sent to after realizing frequency-selecting, can judge that the quality of other microphone devices is good and bad equally, also repeat no more at this.
To sum up, according to the hummer testing circuit that the utility model provides, first the sound that the microphone devices such as hummer send is converted into electric signal, again after amplification filtering, export the electric signal consistent with the voice signal collected to carry out sampling to single-chip microcomputer and judge, thus the quality of the microphone devices such as hummer can be judged, realize the automatic detection of the microphone devices such as hummer.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, although carried out comparatively detailed description with reference to previous embodiment to the utility model, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments or carry out equivalent replacement to wherein portion of techniques feature.All do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (9)
1. a hummer testing circuit, is characterized in that, described circuit comprises and connecting successively:
Acoustic-electric conversion unit, for gathering the sound that hummer sends, and is translated into electric signal;
Signal amplification unit, for carrying out amplification process by described electric signal;
Bandpass filtering unit, carries out bandpass filtering for the electric signal exported described signal amplification unit; And
Single-chip microcomputer judging unit, for carrying out sampling processing to the electric signal through bandpass filtering, judges the quality of described hummer with this.
2. hummer testing circuit as claimed in claim 1, it is characterized in that, described acoustic-electric conversion unit comprises a microphone.
3. hummer testing circuit as claimed in claim 2, it is characterized in that, described microphone is electret microphone, first output terminal of described electret microphone connects positive source through a resistance R1, first output terminal of described electret microphone also connects the input end of described signal amplification unit, the second output head grounding of described electret microphone simultaneously by an electric capacity C1.
4. hummer testing circuit as claimed in claim 3, it is characterized in that, described acoustic-electric conversion unit also comprises an electrochemical capacitor E1 be serially connected between described positive source and ground.
5. hummer testing circuit as claimed in claim 1, it is characterized in that, described signal amplification unit comprises NPN type triode Q1 and biasing resistor R4;
The base stage of described NPN type triode Q1 is the input end of described signal amplification unit, the grounded emitter of described NPN type triode Q1, the output terminal of the very described signal amplification unit of current collection of described NPN type triode Q1, connect the input end of positive source and described bandpass filtering unit simultaneously, described biasing resistor R4 be connected to described NPN type triode Q1 base stage and collector between.
6. hummer testing circuit as claimed in claim 5, is characterized in that, described signal amplification unit also comprises the current-limiting resistance R2 between a collector being connected to described positive source and described NPN type triode Q1.
7. hummer testing circuit as claimed in claim 5, it is characterized in that, described bandpass filtering unit comprises electric capacity C2, electric capacity C3, resistance R3 and resistance R5;
Described resistance R3 is connected between the output terminal of described signal amplification unit and the first end of described electric capacity C3, resistance R5 described in second termination of described electric capacity C3, between the first end that described electric capacity C2 is connected to described electric capacity C3 and ground, the connecing altogether of described resistance R5 and described electric capacity C3 hold for described pass filtering unit output terminal, connect described single-chip microcomputer judging unit.
8. hummer testing circuit as claimed in claim 7, it is characterized in that, described bandpass filtering unit also comprises an electrochemical capacitor E2;
Described electrochemical capacitor E2 is connected between the output terminal of described signal amplification unit and described resistance R3.
9. hummer testing circuit as claimed in claim 5, it is characterized in that, the enlargement factor of described NPN type triode Q1 is between 110 times to 150 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420403974.XU CN204101170U (en) | 2014-07-21 | 2014-07-21 | Hummer testing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420403974.XU CN204101170U (en) | 2014-07-21 | 2014-07-21 | Hummer testing circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204101170U true CN204101170U (en) | 2015-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420403974.XU Expired - Fee Related CN204101170U (en) | 2014-07-21 | 2014-07-21 | Hummer testing circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106802196A (en) * | 2017-01-16 | 2017-06-06 | 中国计量大学 | For the electronic thermometer buzzer sound sound detection device and method of automatic Verification |
| CN108931293A (en) * | 2018-10-08 | 2018-12-04 | 伟创力电子技术(苏州)有限公司 | A kind of method and sensor of on-line testing buzzer |
| CN109932603A (en) * | 2019-04-04 | 2019-06-25 | 滁州星联电子有限公司 | A kind of air conditioner electric control plate buzzer sounding detection method and circuit board |
-
2014
- 2014-07-21 CN CN201420403974.XU patent/CN204101170U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106802196A (en) * | 2017-01-16 | 2017-06-06 | 中国计量大学 | For the electronic thermometer buzzer sound sound detection device and method of automatic Verification |
| CN106802196B (en) * | 2017-01-16 | 2023-07-18 | 中国计量大学 | Electronic thermometer buzzer sound detection device and method for automatic verification |
| CN108931293A (en) * | 2018-10-08 | 2018-12-04 | 伟创力电子技术(苏州)有限公司 | A kind of method and sensor of on-line testing buzzer |
| CN109932603A (en) * | 2019-04-04 | 2019-06-25 | 滁州星联电子有限公司 | A kind of air conditioner electric control plate buzzer sounding detection method and circuit board |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150114 Termination date: 20210721 |
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| CF01 | Termination of patent right due to non-payment of annual fee |