CN112985579A - Buzzer testing method and testing device - Google Patents
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- CN112985579A CN112985579A CN201911291418.1A CN201911291418A CN112985579A CN 112985579 A CN112985579 A CN 112985579A CN 201911291418 A CN201911291418 A CN 201911291418A CN 112985579 A CN112985579 A CN 112985579A
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- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- H—ELECTRICITY
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Abstract
The invention provides a buzzer testing method, which comprises the following steps: s0, sending a control signal, wherein the control signal is used for driving an accessed buzzer to sound; s1, receiving the audio signal of the buzzer, and amplifying the audio signal; s2, converting the amplified audio signal into a sampling point array by setting a sampling point and a sampling duration of unit time; s3, carrying out Fourier transformation on the sampling point array, and converting a time domain signal into a frequency domain signal; s4, acquiring the frequency and peak amplitude of the processed buzzer signal; and S5, comparing the detected frequency and peak amplitude with a preset reference frequency and a preset reference peak amplitude to judge the test result of the buzzer, and judging that the buzzer is qualified when the frequency and the peak amplitude simultaneously meet the conditions.
Description
Technical Field
The invention relates to the technical field of intelligent detection, in particular to a buzzer testing method and a buzzer testing device.
Background
At present, in the field of production and manufacturing, in the process of testing a buzzer, the quality of the buzzer is detected by adopting a mode of listening to the ears of a person, the test method has strong subjectivity, the sound of each person is distinguished by a certain difference, the performance and parameters of the buzzer cannot be accurately judged, and the conditions of error detection, omission detection and the like are easy to occur in the long-time test process. Moreover, the test environment is generally noisy, which increases the difficulty in acquiring audio signals. In order to achieve quality uniformity, a reliable, convenient and accurate detection and identification scheme is required.
Disclosure of Invention
The invention provides a buzzer testing method and a testing device, which can automatically detect and analyze a buzzer audio signal after processing, and effectively solve the problem of false detection and omission of the buzzer when human ears detect.
The invention is realized by the following steps:
a buzzer testing method comprises the following steps:
s0, sending a control signal, wherein the control signal is used for driving an accessed buzzer to sound;
s1, receiving the audio signal of the buzzer, and amplifying the audio signal;
s2, converting the amplified audio signal into a sampling point array by setting a sampling point and a sampling duration of unit time;
s3, carrying out Fourier transformation on the sampling point array, and converting a time domain signal into a frequency domain signal;
s4, acquiring the frequency and peak amplitude of the processed buzzer signal;
and S5, comparing the detected frequency and peak amplitude with a preset reference frequency and a preset reference peak amplitude to judge the test result of the buzzer, and judging that the buzzer is qualified when the frequency and the peak amplitude simultaneously meet the conditions.
As a further improvement, in step S0, the control signal is a pulse signal, and the frequency of the pulse signal is 2.7 KHz.
As a further improvement, in step S2, the setting mode of the sample point array is: the unit time is 1S, the sampling point per second is 100000 points, and the acquisition time is 5S; and sampling the amplified audio signal and storing the sampled audio signal into the sampling point array.
In a further improvement, in step S5, the reference frequency is 2.7kHz, and when the detected frequency is in a range of 2.68 to 2.73kHz, it is determined that the frequency of the buzzer satisfies a condition.
In a further modification, in step S5, the reference peak amplitude is 1, and when the detected peak amplitude is 1 or more, it is determined that the peak amplitude of the buzzer satisfies the condition.
A buzzer testing device is externally connected with a buzzer to be tested and comprises a control chip, a control unit and a control unit, wherein the control chip is used for sending a control signal to the buzzer, and the buzzer receives the control signal and sends an audio signal; the audio signal receiving and amplifying device is used for receiving the audio signal of the buzzer and amplifying the audio signal; the data acquisition card is used for converting the amplified audio signals into a sampling point array; the processing unit is used for controlling the control chip to send out a control signal; the Fourier transform is carried out on the sampling point array, and a time domain signal is converted into a frequency domain signal; the processing unit is further used for acquiring the frequency and the peak amplitude of the processed buzzer signal, and comparing the detected frequency and the detected peak amplitude with a preset reference frequency and a preset reference peak amplitude so as to judge the test result of the buzzer; and the display unit is used for displaying the detection values of the frequency and the peak amplitude.
The invention has the beneficial effects that:
(1) by a simple circuit and a mature theorem theory, the test detection of single-frequency sound signals can be effectively optimized and solved, any shielding box and sound insulation equipment are not needed, most of the existing production lines can be conveniently used, manual judgment is changed into computer software control judgment, and stable and efficient identification detection is realized;
(2) the testing method of the buzzer can be input into Labview software installed in a computer through programming, a buzzer acquisition module user interface is generated on a computer display, a control command is input into the user interface to control the buzzer to sound, then a processed audio signal is acquired through a data acquisition card, and the processed audio signal is analyzed through a program written in advance by the software to obtain a detection result of the buzzer; the detection is accurate;
(3) a kind of audio signal receives and the amplifier, the circuit is modularized, on the industrial test application, when the buzzer is sounded, only need to connect this amplifier circuit with processing unit, can obtain the audio signal suitable for processing unit to detect; the amplifying circuit is modularized, so that the detection efficiency is improved;
(4) the audio signal of the buzzer is amplified in two stages through the audio signal receiving and amplifying device, so that the amplified audio signal has high precision, and the subsequent processing requirement is met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flowchart of a buzzer testing method provided in an embodiment of the present invention;
fig. 2 is a block diagram of a buzzer detecting device according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a buzzer driving circuit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of an audio signal receiving and amplifying circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of software programming provided by an embodiment of the present invention;
fig. 6 is a diagram of a computer-end user operation interface according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
A buzzer testing method, as shown in fig. 1, includes the following steps:
s0, sending a control signal, wherein the control signal is used for driving an accessed buzzer to sound;
s1, receiving the audio signal of the buzzer, and amplifying the audio signal;
s2, converting the amplified audio signal into a sampling point array by setting a sampling point and a sampling duration of unit time;
s3, carrying out Fourier transformation on the sampling point array, and converting a time domain signal into a frequency domain signal;
s4, acquiring the frequency and peak amplitude of the processed buzzer signal;
and S5, comparing the detected frequency and peak amplitude with a preset reference frequency and a preset reference peak amplitude to judge the test result of the buzzer, and judging that the buzzer is qualified when the frequency and the peak amplitude simultaneously meet the conditions.
In the step S0, the control signal is a pulse signal, and the frequency of the pulse signal is 2.7 KHz. In step S2, the setting method of the sample point array is: the unit time is 1S, the sampling point per second is 100000 points, and the acquisition time is 5S; and sampling the amplified audio signal and storing the sampled audio signal into the sampling point array. In the step S5, the reference frequency is 2.7kHz, and when the detected frequency is in the range of 2.68 to 2.73kHz, it is determined that the frequency of the buzzer satisfies a condition; in step S5, the reference peak amplitude is 1, and when the detected peak amplitude is 1 or more, it is determined that the peak amplitude of the buzzer satisfies the condition.
Referring to fig. 2, the buzzer testing device is externally connected with a buzzer to be tested and comprises a control chip, a first signal processing module and a second signal processing module, wherein the control chip is used for sending a control signal to the buzzer, and the buzzer receives the control signal and sends an audio signal; the audio signal receiving and amplifying device is used for receiving the audio signal of the buzzer and amplifying the audio signal; the data acquisition card is used for converting the amplified audio signals into a sampling point array; the processing unit is used for carrying out Fourier change on the sampling point array and converting a time domain signal into a frequency domain signal; the processing unit is further used for acquiring the frequency and the peak amplitude of the processed buzzer signal, and comparing the detected frequency and the detected peak amplitude with a preset reference frequency and a preset reference peak amplitude so as to judge the test result of the buzzer; and the display unit is used for displaying the detection values of the frequency and the peak amplitude.
In this embodiment, the control chip, the processing unit, the data acquisition card, and the display unit may be integrated together, for example, integrated in a computer. The processing unit may be a CPU of a computer, and the display unit may be a display screen of the computer. The data acquisition card can be connected to the computer through a USB bus and is integrally arranged on the computer. The control chip can also be integrated in the computer. The buzzer is connected with the control chip through a buzzer driving circuit.
In the present embodiment, the control chip is a timer chip of STM 32. And sending an instruction at a computer end, outputting a pulse signal with the frequency of 2.7kHz through STM32_ PWM after the control chip receives the instruction, and driving a buzzer to sound. The function of the command is to control the buzzer to sound after the PC end sends the command, so that the acquisition tool knows when to start acquisition. When the data acquisition card acquires the audio signal of the buzzer, firstly, an external sampling clock is set, and undistorted sampling can be performed based on the sampling signal which is two times or more higher than the sampled signal, so that the sampling point per second is set to be 100000 points, and the acquisition time is 5S. And through the acquisition of the voltage value of the amplified audio signal, the data form a sampling point array according to a time sequence.
And the processing unit performs Fourier change on the sampling point array, converts the time domain signal into a frequency domain signal, and acquires the frequency and the peak amplitude of the processed buzzer signal to obtain the detected frequency and the peak amplitude. When the buzzer is detected to be qualified, the frequency is not accurate to 2.7KH but is in the range of 2.68-2.73 kHz because a certain error exists in calculation. The input end of the audio signal receiving and amplifying device collects the audio signal of the buzzer through the microphone, so that the calculated amplitude value of the peak amplitude is influenced by the distance between the buzzer and the collecting microphone, and the peak amplitude is influenced by factors such as different buzzer sound sizes and amplification factors of the amplifying circuit. When the amplification factor is too large, signal distortion is caused, so under the condition that the signal distortion is not too large as much as possible, the strength of the sound of the buzzer is distinguished by adjusting the amplification factor. Therefore, the standard peak amplitude is set to be 1 by adjusting the amplification factor, and the standard peak amplitude is used as a boundary of the sound size of the buzzer, so that the buzzer with critical loudness is debugged and calibrated by a quality inspector in first production.
Referring to fig. 3, the buzzer driving circuit includes: the PNP triode circuit comprises a resistor R146, a resistor R148, a resistor R150, a PNP triode Q10 (the model is LMBT3904), a diode D4 and a buzzer LS1 (the model is BZ _ D9X4), wherein a control parameter of the buzzer is input from a computer end, a BUZ _ PWM signal is output through a control chip, one end of the resistor R146 is input into the buzzer circuit, the other end of the resistor R146 and one end of the resistor R148 are both connected to the base electrode of the PNP triode Q10, the emitter electrode of the PNP triode Q10 is connected in series with the resistor R150 and then connected with the other end of the resistor R148 to be grounded, a first voltage V5.0 is connected with the diode D4 and then connected to the collector electrode of the PNP triode Q10 and the LS1 at the No. 2 pin, and a No. 1 pin of the buzzer 1 is connected to the first voltage V5.0.
Referring to fig. 4, the audio signal receiving and amplifier circuit includes: the buzzer audio signal is input from the first-stage amplifying circuit 1, and the second-stage amplifying circuit 2 outputs the amplified audio signal; the primary amplifying circuit 1 comprises a first operational amplifier U15A and a first peripheral circuit thereof, and the secondary amplifying circuit 2 comprises a second operational amplifier U16B and a second peripheral circuit thereof; the models of the first operational amplifier U15A and the second operational amplifier U16B are TLC274 CDR.
The first peripheral circuit includes: the voltage regulator comprises a capacitor C16, a resistor R115, a first voltage V5.0, a second voltage Vref, a resistor R116, a capacitor C17, a capacitor C18, a resistor R117, a potentiometer VR1, a capacitor C15, a resistor R119 and a capacitor C19; one end of the capacitor C16 is grounded, the other end of the capacitor C16 is connected to the 2 nd pin of the first operational amplifier U15A after being connected to the resistor R115 in series, the second voltage Vref is connected to one end of the resistor R116, the other end of the resistor R116 is connected to the 3 rd pin of the first operational amplifier U15A and one end of the capacitor C17, the other end of the capacitor C17 is grounded, one end of the capacitor C18 and one end of the resistor R117 are both connected to the 2 nd pin of the first operational amplifier U15A, the other end of the resistor R117 is connected to the potentiometer VR1 in series and the other end of the capacitor C18 are both connected to the 1 st pin of the first operational amplifier U15A, one end of the resistor R119 connected to the capacitor C19 in parallel is connected to the 1 st pin of the first operational amplifier U15A, the other end of the resistor R119 is connected to the capacitor C2 in parallel and the other end is connected to the input end of the secondary amplification circuit, the capacitor C15 is grounded at one end, the other end of the capacitor C15 is connected to the 8 th pin of the first operational amplifier U15A, the 8 th pin of the first operational amplifier U15A is connected to the first voltage V5.0, and the 4 th pin of the first operational amplifier U15A is grounded; the buzzer audio signal is input from pin 3 of the first operational amplifier U15A. The primary amplification circuit further includes a welding microphone JP2 connected to the 3 rd pin of the first operational amplifier U15A, from which the buzzer audio signal is input JP 2.
The second peripheral circuit comprises a resistor R120, a capacitor C20, a resistor R121, a capacitor C21, a resistor R128, a resistor R125 and a capacitor C22; one end of the resistor R120 is connected to one end of the resistor R121 to serve as an input end of the secondary amplifying circuit, the other end of the resistor R120 is connected in series with the capacitor C20 and then grounded, the other end of the resistor R121, one end of the capacitor C21, and one end of the resistor R128 are all connected to the 6 th pin of the second operational amplifier U16B, the other end of the capacitor C21 and the other end of the resistor R128 are all connected to the 7 th pin of the second operational amplifier U16B, the second voltage Vref is connected to the 5 th pin of the second operational amplifier U16B after being connected to the resistor R125, the 4 th pin of the second operational amplifier U16B is grounded, the 8 th pin of the second operational amplifier U16B is connected to the first voltage V5.0, and the 7 th pin of the second operational amplifier U16B is connected to the capacitor C22 and then serves as an output end of the secondary amplifying circuit. The secondary amplifying circuit further comprises an audio output interface JP1 connected to the output end of the secondary amplifying circuit, and the buzzer audio signal is amplified and then output from the audio output interface JP 1.
The audio signal receiving and amplifier circuit further includes a power supply circuit 3, an input voltage of the power supply circuit 3 is the first voltage V5.0, an output voltage of the power supply circuit is the second voltage Vref, the power supply circuit includes: the resistor R123, the resistor R124, the capacitor C25, the capacitor C24 and the capacitor C23; one end of the resistor R123, one end of the capacitor C25, and one end of the capacitor C24 are all connected to the first voltage V5.0, the other end of the capacitor C25 is connected in parallel with the other end of the capacitor C24 and then grounded, the other end of the resistor R123, one end of the resistor R124, and one end of the capacitor C23 are all connected to the second voltage Vref, and the other end of the resistor R124 and the other end of the capacitor C23 are connected and then grounded.
In the audio signal receiving and amplifying device, the operational amplifier adopts TLC274CDR, and the operational amplifier of the model has low cost and micro power consumption. The microphone is used for receiving the sound emitted by the buzzer and finally amplifying the voltage. The first-stage amplifying circuit is added with a potentiometer VR1 which can be used for adjusting the amplification factor of the voltage and finally output to software for frequency selection. The audio signal receiving and amplifying device can be designed into a module, is convenient to use on a production line and can be directly connected with a computer, and the amplifying circuit is modularized to improve the detection efficiency. And, two paths of signals can be simultaneously input for amplification.
Referring to fig. 5, in the present embodiment, Labview software is installed in the computer, a graphical program suitable for the Labview software is compiled by using the above-mentioned testing method, a user interface as shown in fig. 6 can be generated, and the user interface is positioned as a "buzzer collection module" during the programming process. In the generated user interface, the test parameters can be input in a preset input box for configuration, and the result of the buzzer detecting the frequency and the peak amplitude is also arranged on the user interface.
In this embodiment, after buzzer testing arrangement connects, set up the buzzer into interval sound production through the computer, by computer end control sound production time length, sound production number of times, control circuit gathers audio signal when the sound production simultaneously, gathers this audio signal after, software is the sampling point array with audio signal conversion on the time domain. The Fourier change is carried out on the multiple groups of sampling point arrays through programmed software, time domain signals are converted into frequency domain signals, the frequency domain peak value can be obtained at the moment, the buzzer signals with single frequency ringing can be obtained in the environment with external noise at the moment, and if the required frequency signals are not found, the fact that the buzzer does not sound is shown. If the required frequency signal is found, displaying the frequency and the amplitude on a user interface, and comparing the detected frequency and the detected peak amplitude with a preset reference frequency and a preset reference peak amplitude so as to judge the test result of the buzzer; and when the frequency and the peak amplitude simultaneously meet the conditions, judging that the buzzer is tested to be qualified.
And when the numerical value of the frequency within the range of 2.68-2.73 kHz is displayed on the user interface, and the peak amplitude is greater than or equal to the numerical value within the range of 1, the buzzer is qualified. And when the frequency is out of the range of 2.68-2.73 kHz or the peak amplitude is in the range of less than 1, judging that the buzzer is unqualified. Therefore, the quality of the buzzer can be easily and accurately detected by manual operation at the PC end.
According to the buzzer testing method, the steps of the buzzer testing method can be input into Labview software installed in a computer through programming, a buzzer acquisition module user interface is generated on a computer display, a control command is input into the user interface to control the buzzer to sound, then a processed audio signal is acquired through a data acquisition card, and the processed audio signal is analyzed through a program written in advance by the software to obtain the detection result of the buzzer; the detection is accurate; the test method can also be applied to testing single-frequency sound signals.
Through simple circuit and mature theorem theory, can effectively optimize the detection of solving single-frequency sound signal to do not need any shielded cell and sound insulation equipment, be convenient for present most of use of producing the line, change artifical judgement into computer software control judgement, realized stable efficient differentiation and detect.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A buzzer testing method is characterized by comprising the following steps:
s0, sending a control signal, wherein the control signal is used for driving an accessed buzzer to sound;
s1, receiving the audio signal of the buzzer, and amplifying the audio signal;
s2, converting the amplified audio signal into a sampling point array by setting a sampling point and a sampling duration of unit time;
s3, carrying out Fourier transformation on the sampling point array, and converting a time domain signal into a frequency domain signal;
s4, acquiring the frequency and peak amplitude of the processed buzzer signal;
and S5, comparing the detected frequency and peak amplitude with a preset reference frequency and a preset reference peak amplitude to judge the test result of the buzzer, and judging that the buzzer is qualified when the frequency and the peak amplitude simultaneously meet the conditions.
2. The buzzer test method as claimed in claim 1, wherein in step S0, the control signal is a pulse signal, and the frequency of the pulse signal is 2.7 KHz.
3. The buzzer test method as claimed in claim 1, wherein in step S2, the sampling point array is set as follows: the unit time is 1S, the sampling point per second is 100000 points, and the acquisition time is 5S; and sampling the amplified audio signal and storing the sampled audio signal into the sampling point array.
4. The buzzer testing method according to claim 1, wherein in the step S5, the reference frequency is 2.7kHz, and when the detected frequency is in the range of 2.68-2.73 kHz, the frequency of the buzzer is judged to meet the condition.
5. The buzzer test method according to claim 1, wherein in said step S5, the value of said reference peak amplitude is 1, and when said detected peak amplitude is greater than or equal to 1, it is determined that the peak amplitude of said buzzer satisfies the condition.
6. A buzzer testing device, characterized in that a buzzer to be tested is externally connected, and the buzzer testing device comprises:
the control chip is used for sending a control signal to the buzzer, and the buzzer receives the control signal and sends an audio signal;
the audio signal receiving and amplifying device is used for receiving the audio signal of the buzzer and amplifying the audio signal;
the data acquisition card is used for converting the amplified audio signals into a sampling point array;
the processing unit is used for controlling the control chip to send out a control signal; the Fourier transform is carried out on the sampling point array, and a time domain signal is converted into a frequency domain signal; the processing unit is further used for acquiring the frequency and the peak amplitude of the processed buzzer signal, and comparing the detected frequency and the detected peak amplitude with a preset reference frequency and a preset reference peak amplitude so as to judge the test result of the buzzer;
and the display unit is used for displaying the detection values of the frequency and the peak amplitude.
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| CN103512650A (en) * | 2012-06-21 | 2014-01-15 | 鸿富锦精密工业（深圳）有限公司 | Buzzer testing circuit |
| US20150215717A1 (en) * | 2014-01-28 | 2015-07-30 | Primax Electronics Ltd. | Buzz detecting method and system |
| US20190099152A1 (en) * | 2017-10-04 | 2019-04-04 | Ausculsciences, Inc. | Auscultatory sound-or-vibration sensor |
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| CN1906473A (en) * | 2004-09-13 | 2007-01-31 | 日本精工株式会社 | Abnormality diagnosis device and abnormality diagnosis method |
| CN1959352A (en) * | 2005-11-02 | 2007-05-09 | 鸿富锦精密工业（深圳）有限公司 | System and method for testing buzzer |
| CN103512650A (en) * | 2012-06-21 | 2014-01-15 | 鸿富锦精密工业（深圳）有限公司 | Buzzer testing circuit |
| US20150215717A1 (en) * | 2014-01-28 | 2015-07-30 | Primax Electronics Ltd. | Buzz detecting method and system |
| US20190099152A1 (en) * | 2017-10-04 | 2019-04-04 | Ausculsciences, Inc. | Auscultatory sound-or-vibration sensor |
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