CN205209626U - Sensor based on discernment of characteristic audio frequency - Google Patents
Sensor based on discernment of characteristic audio frequency Download PDFInfo
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- CN205209626U CN205209626U CN201521091496.4U CN201521091496U CN205209626U CN 205209626 U CN205209626 U CN 205209626U CN 201521091496 U CN201521091496 U CN 201521091496U CN 205209626 U CN205209626 U CN 205209626U
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Abstract
The utility model relates to a sensor based on discernment of characteristic audio frequency, it includes piezoelectric element, amplifier circuit, ADC system, singlechip and output circuit, wherein: piezoelectric element turns into the audio electrical signal with the acoustic vibration, the operation amplifier circuit that amplifier circuit includes the leading amplifier circuit who is used for impedance match and is used for enlargeing the audio electrical signal range of carrying on, place the singlechip in the ADC system in, the analog signal after it will amplify turns into data signal, the singlechip carries out digital threshold value filtering to data signal, feature extraction sound frequency, rather than built -in distinctive tone frequency ratio, then output high level or low level signal, the output circuit and the output port of singlechip are connected, adopt the collecting electrode output switch signal of opening a way. The utility model discloses on the basis of singlechip of having integrateed, can direct recognition feature audio frequency to the output switch signal is used for the system, has small in size, simple structure, multiple functional and monitor reliable and stable advantage.
Description
Technical field
The utility model relates to sensor field, specifically a kind of sensor of feature based audio identification.
Background technology
Common audio sensor is generally directly export after the linear amplification system of voice signal detected being amplified, and sensor does not have the function of feature identification.When this kind of sensor is used for voice recognition, after needing to carry out digitized processing by its external application system, software systems are utilized to carry out frequency spectrum discerning.When such audio sensor is for reporting to the police, mainly through detection signal amplitude, comparing with the threshold value of setting and realizing warning function.When the amplitude of noise signal is larger, easily produces wrong report, misrepresent deliberately phenomenon.
Intelligentized feature identification often depends on computer technology, brings puzzlement to the Miniaturization Design of audio sensor.Along with the progress of singlechip technology, the instruction speed of single-chip microcomputer is more and more faster, built-in function also from strength to strength, the such as single-chip microcomputer of STC15S205EA series 8 51 kernels, the systems such as FLASH program storage, EEPROM data-carrier store, electrification reset, program monitoring, clock oscillation, 8 passage ADC are had in it, 20 pin SOP encapsulate, compact size, conveniently encapsulate together with sensor, and self changes with ADC, dominant frequency reaches 33MHz, for the miniaturization of audio sensor, intelligentized design provide conveniently.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of sensor of feature based audio identification, this sensor directly judges feature audio frequency by built-in monolithic function, thus output switching signal, sensor one-piece construction is simple, multiple functional, it is reliable and stable to monitor.
For solving the problems of the technologies described above, the design feature of the sensor of feature based audio identification of the present utility model comprises piezoelectric element, amplifying circuit, ADC system, single-chip microcomputer and output circuit, wherein: acoustic vibration is converted into audio electrical signal by piezoelectric element; Amplifying circuit comprises for the pre-amplification circuit of impedance matching and the operational amplification circuit for carrying out amplitude amplification to audio electrical signal; ADC system is built in single-chip microcomputer, and the simulating signal after amplification is converted into digital signal by it; Single-chip microcomputer carries out digital threshold filtering to digital signal, extracts characteristic sounds frequency, and the distinctive tone frequency ratio built-in with it comparatively, then exports high level or low level signal to its output port; Output circuit is connected with the output port of single-chip microcomputer, adopts open-collector circuit structure output switching signal.
Described pre-amplification circuit is the voltage follower be made up of metal-oxide-semiconductor and multiple resistance, electric capacity.
Described operational amplification circuit is the homophase operational amplification circuit be made up of operational amplifier and peripheral resistive element.
Described operational amplifier is connected with the potentiometer for regulating sensitivity.
Described single-chip microcomputer adopts the STC15S205EA chip of MCS51 kernel, has FLASH program storage, EEPROM data-carrier store, electrification reset, program monitoring, clock oscillation, 8 passage ADC system in it.
Described piezoelectric element is piezoelectric crystal or piezoelectric ceramics.
Principle of work of the present utility model is: piezoelectric element is used for detecting voice signal, by voltage order one follower, element is passed to piezoelectricity and carry out impedance transformation, the amplitude of then carrying out sound signal is amplified, the ADC system built-in by single-chip microcomputer, simulating signal after amplifying is converted to digital signal, digital filtering is carried out again by the software systems of single-chip microcomputer, environmental interference signal is filtered out, the characteristic sounds frequency sent when filtering out glass breaking, compare with built-in feature audio frequency, finally by output circuit output switch information.
Visible, sensor of the present utility model, can Direct Recognition feature audio frequency on the basis being integrated with single-chip microcomputer, thus output switching signal is applied for system, and it has compact, and structure is simple, multiple functional and monitor reliable and stable advantage.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
Fig. 1 is structural principle schematic block diagram of the present utility model;
Fig. 2 is circuit theory schematic diagram of the present utility model.
Embodiment
With reference to accompanying drawing, the sensor of this feature based audio identification comprises piezoelectric element S1, amplifying circuit, ADC system, single-chip microcomputer U1 and output circuit 1.Simply introduce each components and parts in Fig. 2 below: the piezoelectric element of S1 representative system in Fig. 2, it is responsible for receiving extraneous information; T1 is metal-oxide-semiconductor; A1 represents operational amplifier; RW is adjustment of sensitivity potentiometer; T2 is NPN type triode; J1 represents connector, and it comprises power interface and signal output interface; U1 is single-chip microcomputer, and Single Chip Microcomputer (SCM) system adopts the 15S205EA single-chip microcomputer of STC series; System connects 5V power supply, and VSS connects working power negative pole.
Piezoelectric element S1 its acoustic vibration is converted into audio electrical signal, piezoelectric crystal or piezoelectric ceramics can be adopted, utilize piezoelectric effect that mechanical wave is converted to electric signal.
Amplifying circuit comprises for the pre-amplification circuit 2 of impedance matching and the operational amplification circuit 3 for carrying out amplitude amplification to audio electrical signal.Pre-amplification circuit 2 is the voltage follower be made up of metal-oxide-semiconductor T1 and multiple resistance, electric capacity.Operational amplification circuit 3 is the homophase operational amplification circuit be made up of operational amplifier A 1 and peripheral resistive element.As shown in Figure 2, pre-amplification circuit forms voltage follower by metal-oxide-semiconductor T1 and peripheral cell C1, C2, C3 and R1, R2, R3, R4, the high input impedance charcteristic of circuit and the high internal resistance feature of piezoelectric element are convenient to realize impedance matching, are beneficial to the stability improving sensor-based system; And the low output impedance characteristic of circuit is convenient to and operational amplification circuit interface, therefore pre-amplification circuit not only has the effect of voltage follow, also has the effect of impedance matching; Operational amplifier A 1 and peripheral cell R5, R6, R7 form homophase operational amplification circuit, are used for carrying out amplitude amplification to the voice signal that pre-amplification circuit is followed the tracks of so that with the ADC interface of Single Chip Microcomputer (SCM) system.Operational amplifier A 1 being connected with the potentiometer RW for regulating sensitivity, being adjusted the sensitivity of operational amplifier A 1 by the size adjusting potentiometer.
ADC system is built in single-chip microcomputer U1, and the simulating signal after amplification is converted into digital signal by it; Single-chip microcomputer U1 carries out digital threshold filtering to digital signal, extracts characteristic sounds frequency, and the distinctive tone frequency ratio built-in with it comparatively, then exports high level or low level signal to its output port.Output circuit 1 is connected with the output port of single-chip microcomputer U1, adopts open-collector circuit structure output switching signal.
Single-chip microcomputer U1 adopts the STC15S205EA chip of MCS51 kernel, FLASH program storage, EEPROM data-carrier store, electrification reset, program monitoring, clock oscillation, 8 passage ADC system are had in it, adopt the SOP of 20 pins to encapsulate, internal resource enriches, and is convenient to simplify system.Single-chip microcomputer U1 is except realizing intelligentized control method function, its built-in ADC system is also utilized to complete analog to digital conversion, detected voice signal is after amplifying circuit amplifies, deliver to the I/O mouth P1.0 of U1, by the inside ADC system connecting this mouthful, simulating signal is converted to digital signal, and is stored in data field.Digital threshold filtering is completed by scm software system, tentatively judge whether to need the data to digital signal to be further analyzed, when signal amplitude exceedes the threshold value of setting, scm software system will carry out the identification of signature analysis and feature audio frequency to the data block of data field, and comparatively realize exporting control, finally by output circuit output switch information with the distinctive tone frequency ratio arranged.
Visible, sensor of the present utility model, can Direct Recognition feature audio frequency on the basis being integrated with single-chip microcomputer, thus output switching signal is applied for system, and it has compact, and structure is simple, multiple functional and monitor reliable and stable advantage.Sensor of the present utility model is mainly used in glass breaking and reports to the police, can using the characteristic spectrum of glass breaking sound as preset parameter, after sensor completes characteristic frequency spectrum analysis to detected sound, compare with preset parameter, thus determine whether detected sound meets alert if, send the result of feature identification.
In sum, the utility model is not limited to above-mentioned embodiment.Those skilled in the art, under the prerequisite not departing from spirit and scope of the present utility model, can do some changes and modification.Protection domain of the present utility model should be as the criterion with claim of the present utility model.
Claims (6)
1. a sensor for feature based audio identification, is characterized in that comprising piezoelectric element (S1), amplifying circuit, ADC system, single-chip microcomputer (U1) and output circuit (1), wherein:
Piezoelectric element (S1), acoustic vibration is converted into audio electrical signal by it;
Amplifying circuit, it comprises for the pre-amplification circuit (2) of impedance matching and the operational amplification circuit (3) for carrying out amplitude amplification to audio electrical signal;
ADC system, is built in single-chip microcomputer (U1), and the simulating signal after amplification is converted into digital signal by it;
Single-chip microcomputer, it carries out digital threshold filtering to digital signal, extracts characteristic sounds frequency, and the distinctive tone frequency ratio built-in with it comparatively, then exports high level or low level signal to its output port;
Output circuit (1), it is connected with the output port of single-chip microcomputer (U1), adopts open-collector circuit structure output switching signal.
2. the sensor of feature based audio identification as claimed in claim 1, is characterized in that described pre-amplification circuit (2) is the voltage follower be made up of metal-oxide-semiconductor (T1) and multiple resistance, electric capacity.
3. the sensor of feature based audio identification as claimed in claim 1, is characterized in that described operational amplification circuit (3) is the homophase operational amplification circuit be made up of operational amplifier (A1) and peripheral resistive element.
4. the sensor of feature based audio identification as claimed in claim 3, is characterized in that the potentiometer (RW) described operational amplifier (A1) is connected with for regulating sensitivity.
5. the sensor of feature based audio identification as claimed in claim 1, it is characterized in that described single-chip microcomputer (U1) adopts the STC15S205EA chip of MCS51 kernel, in it, have FLASH program storage, EEPROM data-carrier store, electrification reset, program monitoring, clock oscillation, 8 passage ADC system.
6. the sensor of the feature based audio identification according to any one of claim 1-5, is characterized in that described piezoelectric element (S1) is for piezoelectric crystal or piezoelectric ceramics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521091496.4U CN205209626U (en) | 2015-12-25 | 2015-12-25 | Sensor based on discernment of characteristic audio frequency |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521091496.4U CN205209626U (en) | 2015-12-25 | 2015-12-25 | Sensor based on discernment of characteristic audio frequency |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519148A (en) * | 2018-03-22 | 2018-09-11 | 广州通导信息技术服务有限公司 | A kind of sound wave sensing device of contact |
| CN108983018A (en) * | 2018-05-23 | 2018-12-11 | 奇酷互联网络科技（深圳）有限公司 | Capacitor is uttered long and high-pitched sounds detection method, system, readable storage medium storing program for executing and device |
| CN109187743A (en) * | 2018-08-27 | 2019-01-11 | 深圳市刻锐智能科技有限公司 | Glass breaking detection method, glass breaking alarm and storage medium |
-
2015
- 2015-12-25 CN CN201521091496.4U patent/CN205209626U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519148A (en) * | 2018-03-22 | 2018-09-11 | 广州通导信息技术服务有限公司 | A kind of sound wave sensing device of contact |
| CN108983018A (en) * | 2018-05-23 | 2018-12-11 | 奇酷互联网络科技（深圳）有限公司 | Capacitor is uttered long and high-pitched sounds detection method, system, readable storage medium storing program for executing and device |
| CN108983018B (en) * | 2018-05-23 | 2021-04-06 | 奇酷互联网络科技（深圳）有限公司 | Capacitor squeal detection method, system, readable storage medium and device |
| CN109187743A (en) * | 2018-08-27 | 2019-01-11 | 深圳市刻锐智能科技有限公司 | Glass breaking detection method, glass breaking alarm and storage medium |
| CN109187743B (en) * | 2018-08-27 | 2021-04-13 | 深圳市刻锐智能科技有限公司 | Glass breakage detection method, glass breakage alarm and storage medium |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160504 Termination date: 20161225 |