CN111398645A - Signal parameter detection device and method - Google Patents

Signal parameter detection device and method Download PDF

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Publication number
CN111398645A
CN111398645A CN202010357006.XA CN202010357006A CN111398645A CN 111398645 A CN111398645 A CN 111398645A CN 202010357006 A CN202010357006 A CN 202010357006A CN 111398645 A CN111398645 A CN 111398645A
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signal
parameter detection
adder
amplifier
peak detector
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崔渊
房鸿旭
陈祝洋
高倩
戴霞娟
王云松
张丽
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Jiangsu University of Technology
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Jiangsu University of Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/04—Measuring peak values or amplitude or envelope of ac or of pulses
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
    • G01R19/2509—Details concerning sampling, digitizing or waveform capturing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/10—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into a train of pulses, which are then counted, i.e. converting the signal into a square wave
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/16—Spectrum analysis; Fourier analysis
    • G01R23/165—Spectrum analysis; Fourier analysis using filters
    • G01R23/167—Spectrum analysis; Fourier analysis using filters with digital filters

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mathematical Physics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

The invention relates to the field of signal detection, and particularly discloses a signal parameter detection device which comprises a signal amplification module, a signal processing module and a parameter detection module, wherein the input end of the signal amplification module is connected with a signal to be detected, the signal processing module comprises a zero-crossing comparator, a peak detector and an adder, the input ends of the zero-crossing comparator, the peak detector and the adder are all connected with the signal amplification module, the first output end of the peak detector is connected with the adder, the parameter detection module comprises a first controller and a second controller, the first controller is respectively connected with the output end of the zero-crossing comparator and the second output end of the peak detector, the frequency information of the signal to be detected is detected, the second comparator is connected with the adder, the invention is used for detecting the amplitude of the signal to be detected, and can reduce the manufacturing cost and improve the measurement precision.

Description

Signal parameter detection device and method
Technical Field
The present application relates to the field of signal detection, and in particular, to a signal parameter detection apparatus and method.
Background
In addition, new energy, the continuous development of micro-grids and the use of a plurality of impact and nonlinear load devices in the power grids lead current and voltage signals in the power grids to stack a large amount of harmonic signals on the basis of fundamental waves, the harmonic components of the voltage signals and the current signals can worsen the environment of the electric equipment, and disorder the running state of surrounding equipment, and the existing signal detection device is generally expensive in price and low in accuracy.
Summary of the embodiments
The embodiment provides a signal parameter detection device for solving the problems of high cost and inaccuracy of a signal detection device in the prior art.
The technical scheme adopted by the embodiment is as follows:
a signal parameter detection apparatus comprising:
the input end of the signal amplification module is connected with a signal to be detected;
the signal processing module comprises a zero-crossing comparator, a peak detector and an adder, the input ends of the zero-crossing comparator, the peak detector and the adder are all connected with the signal amplification module, and the first output end of the peak detector is connected with the adder;
the parameter detection module comprises a first controller and a second controller, the first controller is respectively connected with the output end of the zero-crossing comparator and the second output end of the peak detector and used for detecting the frequency information of the signal to be detected, and the second comparator is connected with the adder and used for detecting the amplitude of the signal to be detected.
Further, the signal amplification module comprises a first amplifier, a coil inductor and a second amplifier, wherein the input end of the first amplifier is connected with the signal to be detected, the output end of the first amplifier is connected with the coil inductor, the output end of the coil inductor is connected with the second amplifier, and the second amplifier outputs the amplified signal to be detected to the signal processing module.
Furthermore, the signal processing module further comprises a low-pass filter, an input end of the low-pass filter is connected with the second amplifier, the low-pass filter comprises three signal output ends, and the three signal output ends are respectively connected with the zero-crossing comparator, the peak detector and the adder.
Furthermore, the signal parameter detection device further comprises an inverse proportion arithmetic unit, the input end of the inverse proportion arithmetic unit is connected with the low-pass filter, and the output end of the inverse proportion arithmetic unit is respectively connected with the zero-crossing comparator, the peak detector and the adder.
Furthermore, the signal parameter detection device further comprises a voltage follower, and the inverse proportion arithmetic unit is connected with the zero-crossing comparator, the peak detector and the adder through the voltage follower.
Furthermore, the signal parameter detection device also comprises a key module, and the key module is connected with the parameter detection module.
The embodiment provides a signal parameter detection method for solving the problems of high cost and inaccuracy of a signal detection device in the prior art.
A signal parameter detection method, comprising:
acquiring key information;
outputting corresponding information according to the acquired key information;
when the first key is pressed down, frequency information is output;
when the second key is pressed, outputting amplitude information.
Compared with the prior art, the beneficial effect of this embodiment:
the signal parameter detection device provided by this embodiment amplifies a signal to be detected through the signal amplification module, so that a subsequent circuit can detect the signal to be detected, the amplified signal to be detected outputs three paths of output signals after passing through the signal processing circuit, the three paths of output signals are respectively input to the first controller and the second controller, and the frequency, the peak value and the peak value of the signal to be detected are measured through the first controller and the second controller.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the embodiments, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a first schematic block diagram of a signal parameter detection apparatus according to an embodiment of the present invention;
fig. 2 is a second schematic block diagram of a signal parameter detection apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of current frequency detection provided by an embodiment of the present invention;
FIG. 4 is a schematic block diagram of current magnitude detection provided by an embodiment of the present invention;
fig. 5 is a circuit diagram of a first amplifier provided in the embodiment;
FIG. 6 is a circuit diagram of a low pass filter according to an embodiment of the present invention;
FIG. 7 is a circuit diagram of an inverse proportion operator according to an embodiment of the present invention;
FIG. 8 is a circuit diagram of a voltage follower according to an embodiment of the present invention;
FIG. 9 is a circuit diagram of an adder according to an embodiment of the present invention;
FIG. 10 is a flow chart of a signal parameter detection method according to an embodiment of the present invention;
FIG. 11 is a flowchart of a method for detecting a frequency of a current signal according to an embodiment of the present invention;
FIG. 12 is a flow chart of a frequency measurement interrupt according to an embodiment of the present invention;
fig. 13 is a flowchart of a fundamental wave and harmonic wave signal detection method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments, but not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the embodiment, its application, or uses. All other embodiments obtained by persons skilled in the art based on the embodiments in the present embodiment without any creative efforts belong to the protection scope of the present embodiment.
Fig. 1 shows a signal parameter detection apparatus provided in an embodiment of the present invention, which includes a signal amplification module, a signal processing module, and a parameter detection module, wherein an input end of the signal amplification module is connected to a signal to be detected, the signal processing module includes a zero-crossing comparator, a peak detector, and an adder, input ends of the zero-crossing comparator, the peak detector, and the adder are all connected to the signal amplification module, a first output end of the peak detector is connected to the adder, the parameter detection module includes a first controller and a second controller, the first controller is respectively connected to an output end of the zero-crossing comparator and a second output end of the peak detector, and is configured to detect frequency information of the signal to be detected, and the second comparator is connected to the adder, and is configured to detect an amplitude of the signal to be detected.
It should be noted that, the signal parameter detection device provided in this embodiment amplifies the signal to be detected by the signal amplification module, so that a subsequent circuit can detect the signal to be detected conveniently, the amplified signal to be detected outputs three output signals after passing through the signal processing circuit, the three output signals are respectively input to the first controller and the second controller, and the frequency, the peak value, and the peak-to-peak value of the signal to be detected are measured by the first controller and the second controller.
Further, as shown in fig. 2 and fig. 5, the signal amplifying module includes a first amplifier, a coil inductor, and a second amplifier, an input end of the first amplifier is connected to the signal to be detected, an output end of the first amplifier is connected to the coil inductor, an output end of the coil inductor is connected to the second amplifier, and the second amplifier outputs the amplified signal to be detected to the signal processing module, specifically, the first amplifier provided in this embodiment is configured as a power amplifier, as shown in fig. 5, the power amplifier is composed of an amplifier designed by taking OP07 operational amplifier as a core and a high-speed buffer current amplifier designed by taking a BUF634 chip as a core, the OP07 amplifier is selected to improve the signal-to-noise ratio and pre-amplify the signal, the output current of the BUF634 is 250mA at most, the two parallel stages of BUF634 correspond to a doubling of the maximum output current, i.e. 500mA, which is sufficient to drive the load resistance.
Further, as shown in fig. 2 and fig. 6, the signal processing module further includes a low pass filter, an input end of the low pass filter is connected to the second amplifier, the low pass filter includes three signal output ends, and the three signal output ends are respectively connected to the zero-crossing comparator, the peak detector and the adder, specifically, in this embodiment, a 3KHz low pass filter is designed by means of FliterPro Desktop to remove clutter influence generated in current mutual inductance, the low pass filter adopted in this embodiment is a fourth-order low pass filter, the fourth-order low pass filter adopts a butterworth type, and is formed by cascading two second-order low pass filters, and a frequency response curve in a passband is flattest.
Further, as shown in fig. 2, the signal parameter detecting device further includes an inverse proportion calculator, an input end of the inverse proportion calculator is connected to the low-pass filter, and the low-pass filter is connected to the zero-crossing comparator, the peak detector and the adder through the inverse proportion calculator.
Specifically, as shown in fig. 7, the inverse proportion operator takes an OP07 chip as a core, and an OP07 chip is a low-noise, non-chopper-stabilized bipolar operational amplifier integrated circuit. Because the OP07 has very low input offset voltage (maximum 25 muV for OP 07A), the OP07 does not need extra zero-setting measures in many application occasions, and the OP07 has the characteristics of low input bias current (OP07A is +/-2 nA) and high open-loop gain (300V/mV for OP 07A), and the characteristics of low offset and high open-loop gain make the OP07 particularly suitable for high-gain measuring equipment and weak signals of an amplification sensor.
Specifically, as shown in fig. 9, the adder adds the peak value of the signal output by the peak detection and the signal of the second amplifier to raise the signal of the second amplifier to a positive level and sends the signal to the second controller for processing, and two input voltages are applied to the inverting input terminal of the integrated operational amplifier to form an inverting input addition operation circuit.
Further, as shown in fig. 2 and 8, the signal parameter detecting device further includes a voltage follower, the inverse proportion arithmetic unit is connected to the zero-crossing comparator, the peak detector and the adder through the voltage follower, the input voltage of the voltage follower is in phase with the output voltage and the voltage amplification factor is constantly smaller than and close to 1, the voltage follower has the characteristics of high input resistance and low output resistance, when the input impedance is very high, the voltage follower is equivalent to an open circuit to the previous stage circuit, when the output impedance is very low, the voltage follower is equivalent to a constant voltage source, i.e. the output voltage is not affected by the impedance of the next stage circuit, a circuit which is equivalent to an open circuit to the previous stage circuit and the output voltage is not affected by the impedance of the next stage circuit has an isolation function, even if the previous stage circuit and the next stage circuit are not affected by each other, the embodiment realizes the isolation function by adopting the voltage follower, the isolation function is to isolate the influence of the load on the, the voltage follower is arranged between the front stage and the power amplifier, so that the interference of the back electromotive force of the power amplifier on the front stage can be cut off, and the distortion degree is reduced.
Specifically, in this embodiment, a signal to be measured is generated by a signal generator, an arbitrary waveform signal generated by the signal generator is sent to a first amplifier for signal amplification, and is connected to a resistive load through a wire to form a current loop, and then is made into a current transformer coupling induced current through a winding coil, and the signal to be measured is further amplified by a second amplifier, and then is sent to a low-pass filter for filtering noise and taking out an effective signal, and the low-pass filter outputs three effective signals, which are:
the first path of effective signal generates square waves through a zero-crossing comparator, is sent to a first controller to measure the frequency of the sine waves, and is displayed on a liquid crystal display screen;
the second path of effective signal passes through a peak detector, outputs an effective value of the signal, converts the signal to be detected into a voltage signal through a current-current conversion circuit, then collects the voltage signal, finally sends the collected signal into a second controller for processing, measures the amplitude of the sine wave and displays the amplitude on a liquid crystal display screen;
the third effective signal is superposed with a direct current signal output by peak detection on the basis of an effective signal output by the low-pass filter, the direct current signal is lifted to a positive level and then sent to a second controller for FFT operation, so that the amplitude and the frequency of a non-sinusoidal fundamental wave and each subharmonic signal are obtained, and then the second controller is sent to the first controller through serial port communication and displayed on a liquid crystal display screen.
Specifically, fig. 4 shows a schematic diagram of current frequency measurement in this embodiment, where the first controller provided in this embodiment adopts an MSP430 single chip microcomputer, and in this embodiment, the MSP430 single chip microcomputer is used to measure the frequency, and first a zero-crossing comparator is used to convert a sine wave output by a signal generator into a square wave, and then a timer and a counter of the MSP430 single chip microcomputer are used to count the number of pulses within 1s, so as to directly measure the frequency of the signal, and finally the measured frequency is sent to a display module for display.
Specifically, fig. 5 shows a schematic diagram of current amplitude measurement provided in this embodiment, a signal adopted by the second controller provided in this embodiment is an STM32 single chip, the second controller provided in this embodiment is configured to detect amplitude information of a current signal, first obtain an induced current through coil induction, after passing through a second amplifier (i.e. AD623), the current signal is converted into a voltage signal and the signal to be measured is further amplified, after the further amplified signal to be measured passes through a voltage follower (the output of the former stage signal does not affect the input of the latter stage signal), one path is subjected to peak detection to obtain the size of a signal peak, the other path is connected with a level shift circuit (namely an adder), and finally, is collected by an AD module of an STM32 singlechip, then calls an FFT function through an STM32 singlechip, and performing FFT operation on the signal to be detected, and sending the peak value of the detected signal to a display module for displaying.
Furthermore, the signal parameter detection device also comprises a key module, wherein the key module is connected with the parameter detection module and controls the measurement function through keys.
The embodiment also provides a signal parameter detection method, which includes:
acquiring key information;
outputting corresponding information according to the acquired key information;
when the first key is pressed down, frequency information is output;
when the second key is pressed, outputting amplitude information.
Fig. 10 shows a general flowchart of the signal parameter detection method provided in this embodiment, in which the measurement of the signal frequency and amplitude is implemented by programming two single-chip microcomputers, that is, MSP430F149 and STM32103RC, as follows:
(1) an interrupt timer is adopted in an MSP430F149 singlechip to complete the frequency measurement of sine wave signals, and the sine wave signals are sent to a liquid crystal display for display; an AD acquisition module is used in the MSP430F149 singlechip to acquire sine wave data, the amplitude measurement of sine wave signals is completed, and the sine wave signals are sent to a liquid crystal display for display;
(2) adopt AD acquisition module to gather non-sinusoidal wave data in STM32103RC singlechip, after STM32103 RC's AD acquisition module accomplished non-sinusoidal wave data acquisition, carry out data processing such as FFT operation and obtain fundamental wave and each subharmonic's frequency and amplitude, send fundamental wave and each subharmonic measured data by STM32103 RC's serial ports, MSP430F 149's serial ports receives corresponding data and sends into the LCD screen and shows.
Further, fig. 11 shows a flow chart of the signal frequency measurement provided by this embodiment, the sinusoidal frequency measurement is performed by using the timer A, B of the MSP430F149, in this embodiment, the clock source of the timer B uses the auxiliary clock AC L K with the frequency of 32678HZ, the counting mode is the up-counting mode, the tbcc 0 is set to 32767, when the counter TBR of the timer B is equal to the value in the tbcc 0, an interrupt is triggered, after the interrupt response, an interrupt routine is executed, and the timing time is a product of one counting time (the inverse of the counting frequency) and the total number of counts
Figure BDA0002473818350000091
Thereby realizing 1s timing of the timer B.
Specifically, fig. 12 is a flow chart of frequency measurement interrupt, the interrupt program function of the timer B within 1s is to start the timer a, the clock source of the timer a is input from the external pin P2.1, P2.1 is connected to the signal to be measured, an up-edge triggered count-up mode is adopted, the count magnitude TAR is stored in the freq variable, two interrupt counts for reducing error cycles are performed, an average value is obtained, and the frequency f of the signal to be measured is the frequency fsIs calculated by the formula
Figure BDA0002473818350000101
Further, fig. 13 is a flowchart of a fundamental wave and harmonic signal detection method, in which after the fundamental wave and harmonic signal detection adopts an AD acquisition module to acquire non-sinusoidal wave data, data processing such as FFT operation is performed to obtain the frequency and amplitude of the fundamental wave and each subharmonic, and the current harmonic measurement frequency provided in this embodiment does not exceed 1kHz, that is, the highest frequency f of the signal is not more than 1kHzhIs 1KHZ, and the sampling frequency is set as f according to the Nyquist sampling lawsThen f iss≥2fh＝2KHz。
In order to facilitate the FFT operation, generally, the number N of sampling points is an integer power of 2, in this embodiment, N is 4096, the sampling frequency is 4096HZ, and the resolution is 1HZ, FFT operation is performed on the number N of sampling points of 4096 points, calculation is performed by using the existing FFT algorithm in the DSP library provided by the ARM, the FFT operation result is 4096 complex numbers, the real part and the imaginary part of each complex number are sequentially stored in the Voltage _ Output variable, and the amplitude of each complex number, that is, the amplitude of each frequency point is calculated. After FFT operation, fundamental wave frequency points are maximum amplitude points in a frequency domain, harmonic frequency is integral multiple of the fundamental wave frequency, FFT operation is firstly carried out on 4096 point data collected by an ADC, amplitude values of all points in the frequency domain are calculated, the amplitude value of a non-zero frequency position of a frequency domain signal is set to be A, the amplitude value of a signal in a corresponding time domain is set to be B, then starting from 25HZ, taking 1HZ as a step length until the end of 250HZ, the maximum amplitude value in a traversing searching time domain signal is the fundamental wave amplitude value, and the corresponding frequency is the fundamental wave frequency. And traversing and searching frequency points with the amplitude not being zero from the fundamental frequency to 1KHZ by taking the fundamental frequency as a step length, namely the harmonic frequency.
The signal detection results of this example are as follows:
(1) the signal generator outputs a 10V sine signal, the oscilloscope is used for observing whether the signal waveform on the 10 ohm load is distorted or not and the signal amplitude, and the measurement result is shown in table 1.
TABLE 1 Power Amplifier load Current
Figure BDA0002473818350000111
(2) The signal generator outputs 100 mV-10V sine signals, the current peak value and the frequency of a 10 ohm load are measured and displayed through the single chip microcomputer, the measurement accuracy is calculated, and the measurement result is shown in Table 2.
TABLE 2 sine wave Peak-Peak value, frequency measurement result and error Table
Figure BDA0002473818350000112
Figure BDA0002473818350000121
(3) The signal generator outputs a non-sinusoidal wave with the fundamental wave frequency range of 50-200 HZ, the amplitude and frequency of the fundamental wave and the harmonic wave of the current on the 10-ohm load are measured and displayed through the single chip microcomputer, the measurement error is calculated, and the measurement of the peak value of the frequency peak of the non-sinusoidal wave with the K12 pressed is shown in Table 3.
TABLE 3 non-sinusoidal wave frequency, amplitude measurement and error table
Figure BDA0002473818350000122
From the above three tables, the voltage on the 10 ohm resistor can reach the undistorted 10V voltage. The amplitude measurement error is within 5%, and the frequency error is within 1%, so that the small-signal current detection and the measurement of each harmonic wave are successfully realized.
In summary, the signal parameter detection apparatus and method provided in this embodiment can reduce the manufacturing cost and improve the measurement accuracy.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware that is related to instructions of a program, and the program may be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present embodiment. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above embodiments are merely descriptions of the preferred embodiments of the present embodiment, and do not limit the scope of the present embodiment, and various modifications and improvements made to the technical solutions of the present embodiment by those skilled in the art without departing from the design spirit of the present embodiment should fall within the protection scope defined by the claims of the present embodiment.

Claims (7)

1. A signal parameter detection apparatus, comprising:
the input end of the signal amplification module is connected with a signal to be detected;
the signal processing module comprises a zero-crossing comparator, a peak detector and an adder, the input ends of the zero-crossing comparator, the peak detector and the adder are all connected with the signal amplification module, and the first output end of the peak detector is connected with the adder;
the parameter detection module comprises a first controller and a second controller, the first controller is respectively connected with the output end of the zero-crossing comparator and the second output end of the peak detector and used for detecting the frequency information of the signal to be detected, and the second comparator is connected with the adder and used for detecting the amplitude of the signal to be detected.
2. The signal parameter detection device according to claim 1, wherein the signal amplification module includes a first amplifier, a coil inductor, and a second amplifier, an input end of the first amplifier is connected to the signal to be detected, an output end of the first amplifier is connected to the coil inductor, an output end of the coil inductor is connected to the second amplifier, and the second amplifier outputs the amplified signal to be detected to the signal processing module.
3. The signal parameter detection device of claim 2, wherein the signal processing module further comprises a low-pass filter, an input terminal of the low-pass filter is connected to the second amplifier, the low-pass filter comprises three signal output terminals, and the three signal output terminals are respectively connected to the zero-crossing comparator, the peak detector and the adder.
4. The signal parameter detection device according to claim 3, further comprising an inverse proportion operator, wherein an input terminal of the inverse proportion operator is connected to the low-pass filter, and an output terminal of the inverse proportion operator is connected to the zero-crossing comparator, the peak detector and the adder, respectively.
5. The signal parameter detection device according to claim 4, further comprising a voltage follower, wherein the inverse proportion operator is connected to the zero-crossing comparator, the peak detector and the adder via the voltage follower.
6. The signal parameter detection device according to claim 1, further comprising a key module, wherein the key module is connected to the parameter detection module.
7. A method for signal parameter detection, comprising:
acquiring key information;
outputting corresponding information according to the acquired key information;
when the first key is pressed down, frequency information is output;
when the second key is pressed, outputting amplitude information.
CN202010357006.XA 2020-04-29 2020-04-29 Signal parameter detection device and method Pending CN111398645A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112345812A (en) * 2020-09-25 2021-02-09 华东光电集成器件研究所 Amplifier signal amplitude-frequency detection circuit
CN112698086A (en) * 2021-01-11 2021-04-23 雷蕾潇 Power grid harmonic detection method and power grid harmonic detection device
CN115616266A (en) * 2022-10-11 2023-01-17 广州致远仪器有限公司 Waveform amplitude value measuring method and device, terminal equipment and storage medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112345812A (en) * 2020-09-25 2021-02-09 华东光电集成器件研究所 Amplifier signal amplitude-frequency detection circuit
CN112698086A (en) * 2021-01-11 2021-04-23 雷蕾潇 Power grid harmonic detection method and power grid harmonic detection device
CN115616266A (en) * 2022-10-11 2023-01-17 广州致远仪器有限公司 Waveform amplitude value measuring method and device, terminal equipment and storage medium
CN115616266B (en) * 2022-10-11 2023-08-18 广州致远仪器有限公司 Waveform amplitude value measuring method and device, terminal equipment and storage medium

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