CN205029873U - Detection device based on time domain analysis - Google Patents
Detection device based on time domain analysis Download PDFInfo
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- CN205029873U CN205029873U CN201520356204.9U CN201520356204U CN205029873U CN 205029873 U CN205029873 U CN 205029873U CN 201520356204 U CN201520356204 U CN 201520356204U CN 205029873 U CN205029873 U CN 205029873U
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Abstract
The utility model relates to a signal pickup assembly's detection technical field especially relates to a detection device based on time domain analysis, include: the standard microphone, the microphone awaits measuring, comparing element, calculating unit, AD translation unit, obtain standard time domain wave form signal respectively and gather the time domain waveform signal, comparing element does standard time domain wave form signal and gathers the time domain waveform signal and does the subtraction and handle and obtain comparison time domain result, it compares the time domain result and comprises variable and constant two parts, calculate comparing the time domain result through calculating unit, get rid of the constant, remain the variable, and make statistics of the variable part, and then can acquire the degree of distortion of variable, the degree of distortion of this variable is the degree of distortion for waiting to detect the microphone promptly. The utility model discloses directly carrying out the comparison to gathering the time domain signal, need not to turn into the frequency -region signal, the operand is less, and its detection efficiency is higher. Need not painstakingly to set up the position of waiting to detect the microphone, its testing goal all can be realized down in arbitrary position.
Description
Technical field
The utility model relates to a kind of detection technique field of signal pickup assembly, particularly relates to a kind of checkout gear based on time domain analysis.
Background technology
Microphone, formal name used at school is microphone, is energy conversion device voice signal being converted to the signal of telecommunication.As the critical elements of speech signal collection, in order to improve the serviceability of microphone, usually before microphone products is dispatched from the factory, need to carry out distortion detection.It is all detected by frequency domain that existing microphone distortion detects, its detection method is specially: microphone to be detected obtains a period of time voice signal, in frequency domain, the spectrum component of voice signal mainly concentrates in the scope of 300Hz ~ 3400Hz, by the band pass filter of an anti-aliasing, the voice signal frequency component within the scope of 300Hz ~ 3400Hz is taken out, then by the sample rate of 8kHz, voice signal is sampled, and continue to do DTFT (discreteFouriertransform discrete Fourier transform) functional transformation process, the time-domain sampling signal of voice signal is transformed to corresponding frequency domain sample signal, obtain the frequency-region signal matched with voice signal, analysis is carried out to frequency-region signal and obtains its frequency spectrum, continue to do low-pass filtering treatment to frequency spectrum, filtering useful signal, retain its distorted signal, continue to do RMS (RootMeamSquare r. m. s. value) integral processing or sampling quantification treatment acquisition result to distorted signal, and then carry out analyzing the distortion factor judging microphone to result, but there is a drawback in this kind of detection method, namely operand is larger, need to carry out Fourier transform and obtain frequency-domain function, RMS integration or sampling quantification treatment, and detection efficiency is relatively slow.
Utility model content
For the deficiencies in the prior art, the utility model provides operand little, a kind of checkout gear based on time domain analysis that detection efficiency is high.
Based on a checkout gear for time domain analysis, be applied to the distortion detection of microphone, wherein,
Comprise:
Standard microphone, in order to gather the voice signal that a sound source sends, and forms a normal clock domain waveform signal output,
Microphone to be measured, in order to gather the described voice signal that described sound source sends, and forms a collection time domain waveform signal output;
Comparing unit, in order to receive described normal clock domain waveform signal and described collection time domain waveform signal respectively, and compares result in time domain according to described normal clock domain waveform signal and described collection time domain waveform signal formation one;
Computing unit, describedly compares result in time domain in order to receive, and calculates formation one result of calculation according to the described result in time domain that compares; The distortion factor information of described collection time domain waveform signal is included in described result of calculation;
A/D converting unit, in order to receive described result of calculation, and exports according to the digital signal that described result of calculation formation one and described result of calculation match.
The above-mentioned checkout gear based on time domain analysis, wherein, also comprise filter unit, preset a filtering bandwidth, describedly result in time domain is compared in order to receive, retain mate with described filtering bandwidth described and compare result in time domain, and filtering process is done to the described result in time domain that compares, and export the described result in time domain that compares through filtering process to described computing unit.
The above-mentioned checkout gear based on time domain analysis, wherein, described computing unit comprises
Differentiator, describedly compares result in time domain in order to receive, and catches and describedly compare jump signal in result in time domain;
Integrator, receives described jump signal, and does integral and calculating to described jump signal, forms the described result of calculation including described distortion factor information and exports.
The above-mentioned checkout gear based on time domain analysis, wherein, shown comparing unit is formed by subtracter, described subtracter receives described normal clock domain waveform signal and described collection time domain waveform signal respectively, and does subtraction to described normal clock domain waveform signal and described collection time domain waveform signal and formed and describedly compare result in time domain.
The above-mentioned checkout gear based on time domain analysis, wherein, described differentiator is formed primarily of high pass filter.
The above-mentioned checkout gear based on time domain analysis, wherein, described integrator is formed primarily of low pass filter.
The above-mentioned checkout gear based on time domain analysis, wherein, also comprises a display unit, in order to receive and show described A/D converting unit export described digital signal.
Compared with prior art, the utility model has the advantages that:
In the application, obtain normal clock domain waveform signal respectively and gather time domain waveform signal, comparing unit does normal clock domain waveform signal and collection time domain waveform signal and does subtraction process and obtain and compare result in time domain, it compares result in time domain and is made up of variable and constant two parts, is calculated comparing result in time domain by computing unit, removes constant, retain variable, and variable part is added up, and then the distortion factor of variable can be obtained, the distortion factor of this variable is the distortion factor of microphone to be detected.The utility model directly compares collection time-domain signal, and without the need to being converted into frequency-region signal, operand is less, and its detection efficiency is higher.Simultaneously without the need to deliberately arranging the position of microphone to be detected, under any position, all its testing goal can be realized.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the checkout gear based on time domain analysis.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as restriction of the present utility model.
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of the utility model protection.
It should be noted that, when not conflicting, the embodiment in the utility model and the feature in embodiment can combine mutually.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as restriction of the present utility model.
As shown in Figure 1, a kind of checkout gear based on time domain analysis, is applied to the distortion detection of microphone, wherein,
Comprise:
Standard microphone, in order to gather the voice signal that a sound source sends, and form a normal clock domain waveform signal output, its distortion factor of standard microphone is less, and the voice signal thus gathered by standard microphone can be used as normal clock domain waveform signal.
Microphone to be measured, in order to gather the voice signal that sound source sends, and forms a collection time domain waveform signal output.Microphone to be detected can be arranged at any time arrange, when detecting microphone and being consistent with the distance between sound source and the distance between standard microphone and sound source, normal clock domain waveform signal is identical with the amplitude gathering time domain waveform signal, when the distance detected between microphone and sound source and the distance between standard microphone and sound source inconsistent time, normal clock domain waveform signal is different with the amplitude of collection time domain waveform signal
Comparing unit, in order to receive normal clock domain waveform signal respectively and to gather time domain waveform signal, and compares result in time domain according to normal clock domain waveform signal and collection time domain waveform signal formation one.
Computing unit, compares result in time domain in order to receive, and calculates formation one result of calculation according to comparing result in time domain; The distortion factor information gathering time domain waveform signal is included in result of calculation.
A/D converting unit, in order to receive result of calculation, and exports according to the digital signal that result of calculation formation one and result of calculation match.
Operation principle of the present utility model is: standard microphone gathers the voice signal that a sound source sends, and forms a normal clock domain waveform signal output, the voice signal that the same sound source of microphone collection to be measured sends, and forms a collection time domain waveform signal output; Comparing unit forms one according to normal clock domain waveform signal and collection time domain waveform signal and compares result in time domain, and computing unit calculates formation one result of calculation according to comparing result in time domain; Include the distortion factor information gathering time domain waveform signal in result of calculation, the digital signal that A/D converting unit matches according to result of calculation formation one and result of calculation exports.
When detecting microphone and being consistent with the distance between sound source and the distance between standard microphone and sound source, normal clock domain waveform signal is identical with the amplitude gathering time domain waveform signal, comparing unit does normal clock domain waveform signal and collection time domain waveform signal and does subtraction process and obtain and compare result in time domain, it compares result in time domain and is made up of variable and constant two parts, the distorted portion sudden change gathered in time domain waveform signal is a variable, undistorted part then remains constant (because normal clock domain waveform signal is identical with the amplitude gathering time domain waveform signal, its constant is zero), calculated comparing result in time domain by computing unit, remove constant, retain variable, and statistical disposition is carried out to variable part, and then the distortion factor of variable can be obtained, the distortion factor of this variable is the distortion factor of microphone to be detected.
When the distance detected between microphone and sound source and the distance between standard microphone and sound source inconsistent time, normal clock domain waveform signal is different from the amplitude gathering time domain waveform signal, comparing unit does normal clock domain waveform signal and collection time domain waveform signal and does subtraction process and obtain and compare result in time domain, it compares result in time domain and is made up of variable and constant two parts, the distorted portion sudden change gathered in time domain waveform signal is a variable, undistorted part then remains constant (because normal clock domain waveform signal is different from the amplitude gathering time domain waveform signal, its constant is normal clock domain waveform signal and the difference in magnitude gathering time domain waveform signal), calculated comparing result in time domain by computing unit, remove constant, retain variable, and statistical disposition is carried out to variable part, and then the distortion factor of variable can be obtained, the distortion factor of this variable is the distortion factor of microphone to be detected.
Adopt the checkout gear based on time domain analysis that the utility model provides, directly compare collection time-domain signal (speech signal is time-domain signal inherently), without the need to being converted into frequency-region signal, operand is less, and its detection efficiency is higher.Simultaneously without the need to deliberately arranging the position of microphone to be detected, under any position, all its testing goal can be realized.
As further preferred implementation, the above-mentioned checkout gear based on time domain analysis, wherein, also comprise filter unit, preset a filtering bandwidth, compare result in time domain in order to receive, and do filtering process to comparing result in time domain, what reservation was mated with filtering bandwidth compares result in time domain, and exports the comparison result in time domain through filtering process to computing unit.Filtering bandwidth specifically can be arranged according to practical application, usually can be set between 300Hz ~ 3000Hz, is only one more preferably scope herein, is not to concrete restriction of the present utility model.
As further preferred embodiment, the above-mentioned checkout gear based on time domain analysis, wherein, computing unit comprises
Differentiator, compare result in time domain in order to receive, and jump signal in result in time domain (jump signal is formed by the variable compared in result in time domain) is compared in seizure, further, differentiator is formed primarily of high pass filter.Differentiator only exports the variable part compared in result in time domain, does not then export for constant part, is equivalent to remove the constant part compared in result in time domain, retains the variable part compared in result in time domain.
Integrator, receives jump signal, and does integral and calculating to jump signal, forms the result of calculation including distortion factor information and exports.Further, integrator is formed primarily of low pass filter.By carrying out integration to variable part, this integral result is the distortion factor information gathering time domain waveform signal.
As further preferred embodiment, the above-mentioned checkout gear based on time domain analysis, wherein, shown comparing unit is formed by subtracter, subtracter receives normal clock domain waveform signal respectively and gathers time domain waveform signal, and to normal clock domain waveform signal with gather time domain waveform signal and do subtraction and formed and compare result in time domain.
As further preferred embodiment, the above-mentioned checkout gear based on time domain analysis, wherein, also comprises a display unit, in order to receive and show A/D converting unit export digital signal.In order to show the distortion factor of microphone to be measured intuitively.
These are only the utility model preferred embodiment; not thereby execution mode of the present utility model and protection range is limited; to those skilled in the art; should recognize and all should be included in the scheme that equivalent replacement done by all utilization the utility model specifications and diagramatic content and apparent change obtain in protection range of the present utility model.
Claims (7)
1., based on a checkout gear for time domain analysis, be applied to the distortion detection of microphone, it is characterized in that,
Comprise:
Standard microphone, in order to gather the voice signal that a sound source sends, and forms a normal clock domain waveform signal output,
Microphone to be measured, in order to gather the described voice signal that described sound source sends, and forms a collection time domain waveform signal output;
Comparing unit, in order to receive described normal clock domain waveform signal and described collection time domain waveform signal respectively, and compares result in time domain according to described normal clock domain waveform signal and described collection time domain waveform signal formation one;
Computing unit, describedly compares result in time domain in order to receive, and calculates formation one result of calculation according to the described result in time domain that compares; The distortion factor information of described collection time domain waveform signal is included in described result of calculation;
A/D converting unit, in order to receive described result of calculation, and exports according to the digital signal that described result of calculation formation one and described result of calculation match.
2. the checkout gear based on time domain analysis according to claim 1, it is characterized in that, also comprise filter unit, preset a filtering bandwidth, describedly result in time domain is compared in order to receive, and filtering process is done to the described result in time domain that compares, retain mate with described filtering bandwidth described and compare result in time domain, and export the described result in time domain that compares through filtering process to described computing unit.
3. the checkout gear based on time domain analysis according to claim 1, is characterized in that, described computing unit comprises
Differentiator, describedly compares result in time domain in order to receive, and catches and describedly compare jump signal in result in time domain;
Integrator, receives described jump signal, and does integral and calculating to described jump signal, forms the described result of calculation including described distortion factor information and exports.
4. the checkout gear based on time domain analysis according to claim 1, it is characterized in that, shown comparing unit is formed by subtracter, described subtracter receives described normal clock domain waveform signal and described collection time domain waveform signal respectively, and does subtraction to described normal clock domain waveform signal and described collection time domain waveform signal and formed and describedly compare result in time domain.
5. the checkout gear based on time domain analysis according to claim 3, is characterized in that, described differentiator is formed primarily of high pass filter.
6. the checkout gear based on time domain analysis according to claim 3, is characterized in that, described integrator is formed primarily of low pass filter.
7. the checkout gear based on time domain analysis according to claim 1, is characterized in that, also comprises a display unit, in order to receive and show described A/D converting unit export described digital signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520356204.9U CN205029873U (en) | 2015-05-28 | 2015-05-28 | Detection device based on time domain analysis |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520356204.9U CN205029873U (en) | 2015-05-28 | 2015-05-28 | Detection device based on time domain analysis |
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| CN205029873U true CN205029873U (en) | 2016-02-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106303879A (en) * | 2015-05-28 | 2017-01-04 | 钰太芯微电子科技（上海）有限公司 | A kind of detection device based on time-domain analysis and detection method |
| CN111263284A (en) * | 2020-01-09 | 2020-06-09 | 河南讯飞智元信息科技有限公司 | Microphone fault detection method and device, electronic equipment and storage medium |
-
2015
- 2015-05-28 CN CN201520356204.9U patent/CN205029873U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106303879A (en) * | 2015-05-28 | 2017-01-04 | 钰太芯微电子科技（上海）有限公司 | A kind of detection device based on time-domain analysis and detection method |
| CN106303879B (en) * | 2015-05-28 | 2024-01-16 | 钰太芯微电子科技（上海）有限公司 | Detection device and detection method based on time domain analysis |
| CN111263284A (en) * | 2020-01-09 | 2020-06-09 | 河南讯飞智元信息科技有限公司 | Microphone fault detection method and device, electronic equipment and storage medium |
| CN111263284B (en) * | 2020-01-09 | 2021-10-15 | 河南讯飞智元信息科技有限公司 | Microphone fault detection method and device, electronic equipment and storage medium |
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Granted publication date: 20160210 Effective date of abandoning: 20240116 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20160210 Effective date of abandoning: 20240116 |