CN107219393B - Signal power detection method, device and equipment - Google Patents
Signal power detection method, device and equipment Download PDFInfo
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- CN107219393B CN107219393B CN201710397748.3A CN201710397748A CN107219393B CN 107219393 B CN107219393 B CN 107219393B CN 201710397748 A CN201710397748 A CN 201710397748A CN 107219393 B CN107219393 B CN 107219393B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
- G01R31/2825—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere in household appliances or professional audio/video equipment
Abstract
The application provides a signal power detection method, a signal power detection device and signal power detection equipment. The signal power detection method provided by the application comprises the following steps: acquiring a frequency value of an output signal of equipment to be tested; acquiring sampling data of a preset time length according to the frequency value of the output signal; calculating the output power of the output signal under the load according to the sampling data of the preset time length and the resistance value of the load connected with the equipment to be tested; when the output signal is an asymmetric signal in a single period, the preset time length is equal to integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the predetermined time length is equal to an integral multiple of half of the period value corresponding to the frequency value. The signal power detection method, the signal power detection device and the signal power detection equipment can accurately detect the output power of the output signal.
Description
Technical Field
The present application relates to the field of signal detection, and in particular, to a method, an apparatus, and a device for detecting signal power.
Background
In the production process of the television circuit board, in order to ensure the qualified rate of products, the output power of the loudspeaker circuit board needs to be detected, and the output power is determined to be zero through the detected output power, so that the loudspeaker is silent or the unqualified circuit board of the loudspeaker is possibly burnt due to the fact that the output power is too high.
Because the resistance of the loudspeaker is fixed, at present, when the output power of the loudspeaker circuit board is detected, the voltage value of the output signal of the loudspeaker circuit board is collected, the collected voltage value of the output signal is integrated with the collection duration by the square, and the value obtained by integration is divided by the resistance value of the loudspeaker to calculate the output power of the loudspeaker circuit board under the loudspeaker.
However, when acquiring the voltage value of the output signal of the horn circuit board, in order to enable the acquired signal to restore the output signal more truly, the acquisition frequency needs to be set to be more than 2 times of the frequency of the output signal, so that when the acquisition frequency is set to be higher, the acquisition time length needs to be set to be short due to the limitations of the data storage volume and the data processing volume of the acquisition system, and usually, the acquisition time length only includes one or a few cycles of the output signal. Thus, when the acquisition time is short, the time for sampling the sampling point near the zero point of the output signal may be longer than the time for sampling the sampling point near the peak point of the output signal, or the time for sampling the sampling point near the zero point of the output signal may be shorter than the time for sampling the sampling point near the peak point of the output signal. When the output power is calculated by adopting the existing method, the length of the integral interval is the sampling duration, so that the calculated output power has larger deviation with the actual output power and is inaccurate (when the time of sampling points near the zero point of the output signal is more than the time of sampling points near the peak point of the output signal, the calculated output power is lower than the actual output power, and when the time of sampling points near the zero point of the output signal is less than the time of sampling points near the peak point of the output signal, the calculated output power is higher than the actual output power).
Disclosure of Invention
In view of this, the present application provides a signal power detection method, device and apparatus, so as to solve the problem of low accuracy of the existing signal power detection method.
A first aspect of the present application provides a signal power detection method, including:
acquiring a frequency value of an output signal of equipment to be tested;
acquiring sampling data of a preset time length according to the frequency value of the output signal; when the output signal is an asymmetric signal in a single period, the preset time length is equal to integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetrical signal in a single period, the preset time length is equal to an integral multiple of half of the period value corresponding to the frequency value;
and calculating the output power of the output signal under the load according to the sampling data of the preset time length and the resistance value of the load connected with the equipment to be tested.
Further, the obtaining a frequency value of an output signal of the device under test specifically includes:
acquiring the output signal according to a first sampling frequency and a first sampling duration to obtain first time domain signal data; performing Fourier transform on the first time domain signal data to obtain first frequency domain signal data corresponding to the first time domain signal data;
determining a first peak point according to the ordinate value of the first frequency domain signal data; the first peak point is a data point with the maximum longitudinal coordinate value in the first frequency domain signal data;
and determining a frequency value corresponding to the first peak point according to the first sampling frequency, the first sampling duration and the position information of the first peak point, and determining the frequency value corresponding to the first peak point as the frequency value of the output signal.
Further, the obtaining of the sampling data of the predetermined time duration according to the frequency value of the output signal specifically includes:
determining a second sampling duration according to the frequency value of the output signal; when the output signal is an asymmetric signal in a single period, the second sampling time length is equal to an integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the second sampling time length is equal to an integral multiple of half of the period value corresponding to the frequency value;
and acquiring the output signal according to a second sampling frequency and the second sampling time length to obtain sampling data of the preset time length.
Further, the obtaining of the sampling data of the predetermined time duration according to the frequency value of the output signal specifically includes:
determining a first truncation duration according to the frequency value of the output signal; the first truncation duration is less than or equal to the first sampling duration, and when the output signal is an asymmetric signal in a single period, the first truncation duration is equal to an integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetrical signal in a single period, the first truncation duration is equal to an integral multiple of half of the period value corresponding to the frequency value;
and selecting sampling data with the duration equal to the first truncation duration from the first time domain signal data to obtain the sampling data with the preset duration.
Further, the equipment to be tested is a loudspeaker circuit board of the television.
Further, the first sampling duration is equal to the number of sampling points divided by the first sampling frequency, wherein the number of sampling points is an integer power of 2.
Further, the second sampling frequency is greater than twice the carrier frequency of the output signal.
A second aspect of the present application provides a signal power detection apparatus, including: an acquisition module and a processing module, wherein,
the acquisition module is used for acquiring the frequency value of the output signal of the equipment to be tested;
the acquisition module is further used for acquiring sampling data of a preset time length according to the frequency value of the output signal; when the output signal is an asymmetric signal in a single period, the preset time length is equal to integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetrical signal in a single period, the preset time length is equal to an integral multiple of half of the period value corresponding to the frequency value;
and the processing module is used for calculating the output power of the output signal under the load according to the sampling data of the preset time length and the resistance value of the load connected with the equipment to be tested.
A third aspect of the present application provides a signal power detecting apparatus, comprising: an analog-to-digital converter ADC acquisition circuit and a micro control unit MCU, wherein,
the ADC acquisition circuit is used for acquiring an output signal of the equipment to be tested under the control of the MCU;
the MCU is used for acquiring the frequency value of the output signal; acquiring sampling data of a preset time length according to the frequency value of the output signal; calculating the output power of the output signal under the load according to the sampling data of the preset time length and the resistance value of the load connected with the equipment to be tested; when the output signal is an asymmetric signal in a single period, the preset time length is equal to integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the predetermined time length is equal to an integral multiple of half of the period value corresponding to the frequency value.
Further, the ADC acquisition circuit is specifically configured to acquire the output signal according to a first sampling frequency and a first sampling duration to obtain first time domain signal data;
the MCU is specifically used for carrying out Fourier transform on the first time domain signal data to obtain first frequency domain signal data corresponding to the first time domain signal data; determining a first peak point according to the ordinate value of the first frequency domain signal data; determining a frequency value corresponding to the first peak point according to the first sampling frequency, the first sampling duration and the position information of the first peak point, and determining the frequency value corresponding to the first peak point as the frequency value of the output signal; the first peak point is a data point with a maximum ordinate value in the first frequency domain signal data.
According to the signal power detection method, the signal power detection device and the signal power detection equipment, the frequency value of the output signal of equipment to be detected is obtained, and then the sampling data of the preset time length is obtained based on the obtained frequency value of the output signal, so that the output power of the output signal under the load is calculated according to the sampling data of the preset time length and the resistance value of the load connected with the equipment to be detected, wherein when the output signal is an asymmetric signal in a single period, the preset time length is equal to the integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the predetermined time length is equal to an integral multiple of half of the period value corresponding to the frequency value. Therefore, in the sampling data with the preset time length, the time length of the sampling data point near the zero point of the output signal is basically equal to the time length of the sampling data point near the peak point of the output signal, so that the problem that the calculation result is inaccurate due to too large difference between the time lengths of the sampling data point near the peak point and the sampling data point near the zero point when the output power is calculated by the conventional signal power detection method can be solved, and the output power of the output signal can be accurately obtained.
Drawings
Fig. 1 is a schematic view of an application scenario of a signal power detection method, apparatus and device provided in the present application;
FIG. 2 is a flowchart illustrating a first embodiment of a signal power detection method according to the present application;
FIG. 3 is a flowchart illustrating a second embodiment of a signal power detection method according to the present application;
FIG. 4 is a waveform diagram illustrating first time domain signal data according to an exemplary embodiment;
fig. 5 is a waveform diagram corresponding to first frequency domain signal data corresponding to the first time domain signal data shown in fig. 4;
fig. 6 is a flowchart of a third embodiment of a signal power detection method according to the present application;
FIG. 7 is a waveform diagram illustrating sample data for a predetermined time period in accordance with an exemplary embodiment;
FIG. 8 is a waveform diagram illustrating sample data for a predetermined time period in accordance with another exemplary embodiment;
FIG. 9 is a waveform diagram illustrating sample data for a predetermined time period in accordance with yet another exemplary embodiment;
FIG. 10 is a flowchart illustrating a fourth exemplary embodiment of a signal power detection method according to the present application;
fig. 11 is a schematic structural diagram of a signal power detection apparatus according to a first embodiment of the present application;
fig. 12 is a schematic structural diagram of a first embodiment of the signal power detection apparatus according to the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that such uses are interchangeable where appropriate.
The application provides a signal power detection method, a signal power detection device and signal power detection equipment, which are used for solving the problem of low accuracy of the existing signal power detection method.
The signal power detection method, the signal power detection device and the signal power detection equipment can be applied to various fields to detect the output power of an output signal under a specific load. For example, fig. 1 is a schematic view of an application scenario of the signal power detection method, apparatus and device provided in the present application. Referring to fig. 1, the signal power detection method, device and apparatus provided by the present application may be applied to the field of televisions, so as to more accurately detect the output power of the speaker circuit board of the television through the signal power detection method, device and apparatus provided by the present application, and further identify the unqualified circuit board based on the detected output power.
The technical solution of the present application will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 2 is a flowchart of a signal power detection method according to a first embodiment of the present application. The execution main body of the embodiment of the application can be an independent signal power detection device, and can also be a signal power detection device integrated with the signal power detection device. The embodiment of the present application takes an execution subject as a signal power detection device integrated with a signal power detection apparatus as an example. Referring to fig. 2, the signal power detection method provided in this embodiment may include the following steps:
s101, obtaining a frequency value of an output signal of the equipment to be tested.
It should be noted that the device under test may be any device that needs to measure the output power, for example, a speaker circuit board of a television, a speaker circuit board of a computer, or the like. Referring to fig. 1, the following describes in detail a signal power detection method provided by the present application, taking an example that a device to be tested is a speaker circuit board of a television. In addition, the output signal of the device under test is a periodic signal, and the output signal of the device under test may be an asymmetric signal in a single period or a symmetric signal in a single period. In combination with the above example, when the device under test is a speaker circuit board of a television, the output signal is a sinusoidal signal (i.e., the output signal is a symmetrical signal in a single period).
Specifically, in a possible implementation manner of the present application, the frequency value of the output signal of the device under test may be obtained by the following method, specifically, the method may include the following steps: (1) sending a frequency value obtaining instruction to front-end equipment of the equipment to be tested, wherein the front-end equipment inputs the output signal to the equipment to be tested; (2) and receiving a feedback signal sent by the front-end equipment, wherein the feedback signal carries the frequency value of the output signal. Thus, based on the above steps, the frequency value of the output signal can be accurately obtained. For example, in this embodiment, the frequency value of the output signal obtained from the speaker circuit board of the television set is 150Hz by the above method.
S102, acquiring sampling data of a preset time length according to the frequency value of the output signal; when the output signal is an asymmetric signal in a single period, the predetermined time length is equal to an integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the predetermined time length is equal to an integral multiple of half of the period value corresponding to the frequency value.
Specifically, to facilitate the description of the technical solution of the embodiment, the predetermined time is recordedIs L (unit is s), the frequency value of the output signal is denoted as f
0(in Hz), the period value of the output signal is denoted as T (where T is 1/f)
0Seconds). Thus, when the output signal is an asymmetric signal in a single period, the predetermined time period is equal to an integral multiple of the period value corresponding to the frequency value, i.e., L is NT, where N is a positive integer. For example, N may equal 12. In this embodiment, the predetermined time length is set to be an integral multiple of the period value of the output signal, and the sampling data of the predetermined time length is obtained based on the set predetermined time length. In this way, it is ensured that, in the above-mentioned sample data of the predetermined time period, the time period of taking the sample data point near the peak point of the output signal and the time period of taking the sample data point near the zero point of the output signal are substantially equal.
Accordingly, when the output signal is a symmetric signal in a single period, the predetermined time length is equal to an integral multiple of half of the period value corresponding to the frequency value, i.e., L is NT/2, where N is a positive integer. For example, N may be equal to 1. With reference to the above example (the device to be tested is a speaker circuit board of a television, the output signal of the speaker circuit board of the television is a sinusoidal signal, that is, the output signal is a symmetric signal in a single period, and the frequency value of the output signal obtained from the speaker circuit board of the television is equal to 150Hz), in this embodiment, the predetermined time period may be equal to 1/300 seconds. In the case where the output signal is a symmetrical signal in a single period, it can be seen from the power calculation formula that, after the voltage value of the output signal is squared, the period of the square of the voltage value of the output signal is equal to half of the period of the voltage value of the output signal (that is, after the voltage value of the output signal is squared, the period of the square of the voltage value of the output signal is equal to T/2 (the period value of the output signal is equal to T)). In this way, in this case, when the output signal is a symmetric signal within a single period, it is only necessary to set the predetermined time length to be an integral multiple of half of the period value of the output signal, so that it is ensured that, in the sample data of the predetermined time length, the time length of sampling data points taken near the peak point of the output signal and the time length of sampling data points taken near the zero point of the output signal are substantially equal.
It should be noted that the type of the output signal may be obtained by issuing a command to the front-end device of the device under test (i.e., determining whether the output signal is a symmetric signal in a single period or an asymmetric signal in a single period), or determining the type of the output signal based on the acquired data.
More specifically, in this step, when acquiring the sampling data of a predetermined time period according to the frequency value of the output signal, the following method may be used. For example, in one possible implementation, the sampling duration may be set to the predetermined duration, and then the sampling is performed according to the set sampling duration to obtain the sampling data of the predetermined duration. For another example, in another possible implementation manner, sampling may be performed according to a preset sampling duration to obtain sampling data of the output signal, and then sampling data of a predetermined duration may be selected from the collected sampling data. The specific implementation process of this step will be described in detail below with specific embodiments, and will not be described herein again.
The sampling data may be sampling data obtained by collecting a voltage value of the output signal, or may be sampling data obtained by collecting a current value of the output signal. In this embodiment, a description will be given taking sampling data obtained by collecting voltage values of output signals as an example.
And S103, calculating the output power of the output signal under the load according to the sampling data of the preset time length and the resistance value of the load connected with the equipment to be tested.
Specifically, when the sampled data is the sampled data obtained by collecting the voltage value of the output signal, in this step, the output power of the output signal under the specific load may be calculated according to equation (1).
Wherein, P is output power;
x (n) is the ordinate value of the nth data point in the sampling data of the preset time length;
l is sampling duration;
r is the resistance value of the load.
It should be noted that, when the sampled data is the sampled data obtained by acquiring the current value of the output signal, a corresponding power calculation formula may be used to calculate the output power of the output signal under a specific load.
In the implementation, when the output power of the output signal under a specific load is calculated, the frequency value of the output signal of the device to be tested is obtained, and then the sampling data of the preset time length is obtained based on the obtained frequency value of the output signal, wherein when the output signal is an asymmetric signal in a single period, the preset time length is equal to the integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the predetermined time length is equal to an integral multiple of half of the period value corresponding to the frequency value. Therefore, when the output power of the output signal under the load is calculated according to the sampling data with the preset time length and the resistance value of the load connected with the device to be measured, the time length of sampling data points near the peak point of the output signal and the time length of sampling data points near the zero point of the output signal in the sampling data with the preset time length can be basically equal, the problem that the calculation result is inaccurate due to the fact that the difference between the time length of sampling data points near the peak point of the output signal and the time length of sampling data points near the zero point of the output signal is too large when the output power is calculated by the existing method can be solved, the calculation precision can be improved, and the accuracy of the calculation result is improved (the calculated output power is not greatly deviated from the actual output power).
In the signal power detection method provided in this embodiment, a frequency value of an output signal of a device to be detected is obtained, and then sample data of a predetermined duration is obtained based on the obtained frequency value of the output signal, so that output power of the output signal under a load is calculated according to the sample data of the predetermined duration and a resistance value of the load connected to the device to be detected, where, when the output signal is an asymmetric signal in a single period, the predetermined duration is equal to an integer multiple of a period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the predetermined time length is equal to an integral multiple of half of the period value corresponding to the frequency value. Therefore, the output power of the output signal under the load can be accurately acquired.
Fig. 3 is a flowchart of a second embodiment of the signal power detection method of the present application. The embodiment relates to a specific process of how to obtain the frequency value of the output signal of the device under test. On the basis of the first embodiment, step S101 specifically includes:
s201, acquiring the output signal according to a first sampling frequency and a first sampling duration to obtain first time domain signal data.
Specifically, an acquisition module is arranged in the signal power detection device, and the output signal of the equipment to be detected can be acquired by the acquisition module. In specific implementation, the obtaining module may be implemented by an Analog-to-Digital Converter (ADC) acquisition circuit.
It should be noted that, according to the sampling theorem, to recover the original signal without distortion by using the sampling signal, the sampling frequency should be 2 times higher than the highest frequency of the original signal. Therefore, in this embodiment, the first sampling frequency should be greater than 2 times the highest frequency of the output signal. For example, in this embodiment, when the device under test is a speaker circuit board of a television, the output signal is a sound signal, and the frequency of the sound signal is between 20Hz and 20KHz, therefore, the first sampling frequency should be at least twice as high as 20KHz, that is, the first sampling frequency should be greater than 40 KHz. For example, the first sampling frequency may be 48 KHz. It should be noted that, in order to accurately determine the frequency value of the output signal, the smaller the first sampling frequency, the better.
Further, the first sampling time length is set by a user according to actual needs. Specifically, the user may determine the first sampling duration according to the data storage capacity, the data processing capacity, and the first sampling frequency of the signal power detection apparatus. Optionally, in a possible implementation manner of the present application, in order to meet the requirement of the fourier transform, the first sampling duration may be determined by a method that the first sampling duration is equal to the number of sampling points divided by the first sampling frequency, where the number of sampling points is an integer power of 2. Further, in the present embodiment, in order to achieve both the calculation accuracy and the data storage capability of the signal power detection apparatus, the number of sampling points may be determined to be 4096. Thus, in connection with the above example, when the first sampling frequency is 48KHz, the first sampling duration is 4096/48000 seconds (i.e., 4096 data points can be acquired within that sampling duration).
In conjunction with the above example, when the first sampling frequency is 48KHz and the first sampling duration is 4096/48000 seconds, and at this time, when the output signal is collected according to the first sampling frequency and the first sampling duration, the collected first time domain signal data may be as shown in fig. 4 (fig. 4 is a waveform diagram corresponding to the first time domain signal data shown in an exemplary embodiment).
S202, performing fourier transform on the first time domain signal data to obtain first frequency domain signal data corresponding to the first time domain signal data.
Specifically, in this step, first, fourier transform is performed on the first time domain signal data to obtain first frequency domain signal data corresponding to the first time domain signal data. It should be noted that, for a specific implementation procedure and implementation principle of the fourier transform, reference may be made to descriptions in the prior art, and details are not described herein. For example, in this embodiment, after performing fourier transform on the first time domain signal data shown in fig. 4, the first frequency domain signal data shown in fig. 5 is obtained (specifically, fig. 5 is a waveform diagram corresponding to the first frequency domain signal data corresponding to the first time domain signal data shown in fig. 4). In addition, since the time domain signal data is a real number and the front and rear halves of the frequency domain signal data obtained by fourier transform are symmetrical, in this embodiment, the time domain signal data is only the front half.
S203, determining a first peak point according to the ordinate value of the first frequency domain signal data; the first peak point is a data point with a maximum ordinate value in the first frequency domain signal data.
Specifically, after the first time domain signal data is subjected to fourier transform, and first frequency domain signal data corresponding to the first time domain signal data is obtained, several peak points (see fig. 5, two peak points exist) exist in the first frequency domain signal data, and at this time, the first peak point is determined according to the ordinate value of the first frequency domain signal data. It should be noted that the first peak point is a data point with the largest ordinate in the first frequency domain signal data. Referring to fig. 5, in the present embodiment, the first peak point is the 13 th data point in the first frequency-domain signal data (see fig. 5, the first peak point is the peak point on the left side in fig. 5, where 13 is the position information of the data point).
And S204, determining a frequency value corresponding to the first peak value according to the first sampling frequency, the first sampling duration and the position information of the first peak value, and determining the frequency value corresponding to the first peak value as the frequency value of the output signal.
It should be noted that the position information of the first peak point represents that the first peak point is the second sampled data point, for example, in combination with the above example, when the position information of the first peak point is 13, the first peak point is represented as the 13 th sampled data point.
Specifically, for clearly describing a specific implementation process of this step, a first sampling frequency is denoted as a, a first sampling duration is denoted as t, position information corresponding to a first peak point is denoted as m, and a frequency value corresponding to the first peak point is denoted as f. At this time, the frequency value f corresponding to the first peak point is calculated according to the following formula: namely, it is
In combination with the above example, in the present embodiment, the frequency value f corresponding to the first peak point is calculated to be equal to 152.34375Hz (f is 13 × 48000/4096 — 152.34375 Hz). Thus, after the frequency value corresponding to the first peak point is obtained through calculation, the frequency value corresponding to the first peak point is determined as the frequency value of the output signal (the frequency value of the output signal obtained through the method is not greatly different from the actual frequency value (150Hz) of the output signal).
In the signal power detection method provided by this embodiment, when obtaining the frequency value of the output signal of the device to be detected, the output signal is first collected according to a first sampling frequency and a first sampling duration to obtain first time domain signal data, then the first time domain signal data is subjected to fourier transform to obtain first frequency domain signal data corresponding to the first time domain signal data, and further, the frequency value of the output signal is obtained based on the first frequency domain signal data. Therefore, the frequency value of the output signal can be accurately acquired, and the sampling data of the preset time length can be acquired based on the acquired frequency value of the output signal, so that the output power of the output signal under the specific load can be calculated according to the sampling data of the preset time length and the resistance value of the load connected with the equipment to be tested. Therefore, the calculation precision can be improved, and the accuracy of the calculation result can be improved.
Two specific embodiments are given below for describing the signal power detection method provided in the present application in detail.
Fig. 6 is a flowchart of a third embodiment of the signal power detection method of the present application. The present embodiment relates to the whole process of the signal power detection method. Referring to fig. 6, the signal power detection method provided in this embodiment may include the following steps:
s301, obtaining the frequency value of the output signal of the device to be tested.
It should be noted that, for a specific implementation process and an implementation principle of the step, reference may be made to the description of step S101 in the first embodiment or the description of the second embodiment, and details are not described here again.
Specifically, the present embodiment takes the method described in the second embodiment as an example for explanation. In this way, in this embodiment, through steps S201 to S204, the frequency value of the output signal obtained from the device under test is 152.34375 Hz.
S302, determining a second sampling duration according to the frequency value of the output signal; when the output signal is an asymmetric signal in a single period, the second sampling time length is equal to the integral multiple of the period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the second sampling duration is equal to an integral multiple of half of the period value corresponding to the frequency value.
Specifically, after the frequency value of the output signal is obtained in step S301, in this embodiment, the second sampling duration is determined according to the frequency value of the output signal, and the output signal is further collected based on the determined second sampling duration to obtain the sampling data of the predetermined duration.
Specifically, in this step, when determining the second sampling duration according to the frequency value of the output signal, and when the output signal is an asymmetric signal within a single period, determining that the second sampling duration is equal to an integer multiple of a period value corresponding to the frequency value; and when the output signal is a symmetrical signal in a single period, determining that the second sampling time length is equal to the integral multiple of half of the period value corresponding to the frequency value. In this embodiment, in combination with the above example, the output signal of the speaker circuit board of the television set is a sinusoidal signal, so that, at this time, the second sampling duration may be determined to be equal to an integral multiple of half of the period value corresponding to the frequency value. For example, in the present embodiment, the second sampling duration may be determined to be equal to 0.003282 seconds (where 0.003282 ═ 1/(2 × 152.3437)).
And S303, acquiring the output signal according to a second sampling frequency and the second sampling time length to obtain sampling data with preset time length.
Specifically, the second sampling frequency is determined by the user according to actual needs. For example, in the present embodiment, the second sampling frequency may be 48 KHz. Optionally, in a possible implementation manner of the present application, to reduce the influence of the carrier wave on the calculation result, the second sampling frequency may be set to be greater than twice the carrier frequency of the output signal. For example, in the present embodiment, the second sampling frequency may be 1 MHz.
The second sampling period is 0.003282 seconds, and the second sampling frequency is 1 MHz. Specifically, after the second sampling duration (0.003282S) is determined in step S301, in this step, the output signal is collected according to the second sampling frequency (1MHz) and the second sampling duration (0.003282S), so as to obtain sampling data of a predetermined duration (0.003282S). As shown in any one of fig. 7, 8 and 9, fig. 7, 8 and 9 are waveform diagrams corresponding to sampling data of a predetermined time length respectively, which is shown in an exemplary embodiment. Fig. 7, 8, and 9 are different in that sampling start points are different, where fig. 7 is sample data obtained with a zero point as the sampling start point, fig. 8 is sample data obtained with a vicinity of the zero point as the sampling start point, and fig. 9 is sample data obtained with a vicinity of a peak point as the sampling start point.
And S304, calculating the output power of the output signal under the load according to the sampling data of the preset time length and the resistance value of the load connected with the equipment to be tested.
It should be noted that, for a specific implementation process and an implementation principle of the step, reference may be made to the description of step S103 in the first embodiment, and details are not described here.
Specifically, in connection with the above example, for example, with respect to the sampled data shown in fig. 7, the output power P0 of the output signal under the above load is calculated to be equal to 0.5528/R; for the sampled data shown in fig. 8, the output power P1 of the output signal under the load is calculated to be equal to 0.5505/R; for the sampled data shown in fig. 9, the output power P2 of the output signal under the above-mentioned load is calculated to be equal to 0.5394/R. It should be noted that, when the output power is calculated according to the method provided in this embodiment, with respect to fig. 7, 8, and 9, the calculated difference of the output power is equal to 2.01% (where 2.01% (P1-P2)/P0), the difference is small, and the calculated output power is more accurate (that is, although the sampling starting point is different for fig. 7, 8, and 9, the difference of the output power calculated by the method provided in this embodiment is small (the difference is small from the actual output power of the device under test, and the calculation result is more accurate)).
In the signal power detection method provided in this embodiment, a second sampling duration is determined by obtaining a frequency value of an output signal of a device to be detected and further based on the obtained frequency value of the output signal, so as to collect the output signal according to the second sampling duration to obtain sampling data with a predetermined length, where, when the output signal is an asymmetric signal in a single period, the second sampling duration is equal to an integer multiple of a period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the second sampling duration is equal to an integral multiple of half of the period value corresponding to the frequency value. Therefore, the output power of the output signal under the load is calculated according to the sampling data with the preset length and the resistance value of the load connected with the equipment to be measured, the time length of the sampling data point near the zero point of the output signal in the sampling data with the preset time length can be ensured to be basically equal to the time length of the sampling data point near the peak point of the output signal, the problem that the calculation result is inaccurate in the existing method can be solved, the calculation precision can be improved, and the accuracy of the calculation result can be improved.
Fig. 10 is a flowchart of a fourth embodiment of the signal power detection method of the present application. The present embodiment relates to the whole process of the signal power detection method. Referring to fig. 10, the signal power detection method provided in this embodiment may include the following steps:
s401, acquiring an output signal of the device to be tested according to the first sampling frequency and the first sampling duration to obtain first time domain signal data.
S402, performing fourier transform on the first time domain signal data to obtain first frequency domain signal data corresponding to the first time domain signal data.
S403, determining a first peak point according to the ordinate value of the first frequency domain signal data; the first peak point is a data point with a maximum ordinate value in the first frequency domain signal data.
S404, determining a frequency value corresponding to the first peak point according to the first sampling frequency, the first sampling duration, and the position information of the first peak point, and determining the frequency value corresponding to the first peak point as the frequency value of the output signal.
It should be noted that, for specific implementation procedures and implementation principles of steps S401 to S404, reference may be made to descriptions of steps S201 to S204 in the second embodiment, which are not described herein again.
S405, determining a first interception duration according to the frequency value of the output signal; wherein, the first truncation duration is less than or equal to the first sampling duration, and when the output signal is an asymmetric signal in a single period, the first truncation duration is equal to an integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the first truncation duration is equal to an integral multiple of half of the period value corresponding to the frequency value.
Specifically, the first truncation period may be determined according to the following method (for convenience of describing the technical solution of the present application, the first truncation period is denoted as L1, and the unit is second), first, a period value T of the output signal may be determined according to the frequency value of the output signal (please continue to refer to fig. 3, and in conjunction with the above example, through steps S401 to S404, the frequency value of the output signal of the device under test is determined to be 152.34375Hz, and accordingly, the period value of the output signal is determined to be 1/152.34375 second), and then, the first truncation period L1 is determined according to the following formula, specifically, when the output signal is an asymmetric signal in a single period, L1 is equal to nT, where n is a positive integer. And when the output signal is a symmetrical signal in a single period, L is nT/2, wherein n is a positive integer.
It should be noted that, in this embodiment, the first truncation period is less than or equal to the first sampling period. For example, when the output signal is a sinusoidal signal, if the first sampling duration is greater than aT/2 and less than bT/2 (where a is less than b, and a and b are adjacent positive integers), then the first truncation duration can only be equal to aT/2 aT most. Referring to fig. 4, for example, in the embodiment, the first sampling duration is 4096/48000 seconds, and it is determined through steps S401 to S404 that the frequency value of the output signal of the device under test is 152.34375Hz, at this time, 25T/2 < (4096/480000) < 26T/2, so at this time, the first truncation duration may be 25T/2 seconds at maximum, that is, the first truncation duration may be 0.082S at maximum (the first truncation duration may be equal to T/2, T, 3T/2 … …, 25T/2). It should be noted that, in a specific implementation, in order to fully utilize the collected data points to calculate the output power of the output signal under a specific load, the first truncation time period is generally equal to 0.082s (that is, the first truncation time period is a maximum value of values that can be taken). The first truncation period is described below as being equal to 0.082 s.
S406, selecting sampling data with a duration equal to the first truncation duration from the first time domain signal data, and obtaining sampling data with a predetermined duration.
Specifically, after the first truncation period is determined in step S405, in this step, sampling data with a period equal to the first truncation period is selected from the first time domain signal data, so as to obtain sampling data with a predetermined period. With continuing reference to fig. 4, and in conjunction with the above example, the sample data with the duration equal to 0.082s is truncated in fig. 4 to obtain the sample data with the predetermined duration. It should be noted that, as can be seen from fig. 4, in the sampling data of the predetermined time length, the time length of sampling data points taken near the peak point of the output signal and the time length of sampling data points taken near the zero point of the output signal are substantially equal.
And S407, calculating the output power of the output signal under the load according to the sampling data of the preset time length and the resistance value of the load connected with the device to be tested.
It should be noted that, for a specific implementation process and an implementation principle of the step, reference may be made to the description of step S103 in the first embodiment, and details are not described here again.
In the signal power detection method provided in this embodiment, after a frequency value of an output signal is determined according to collected first time domain signal data, a first truncation duration is further determined according to the frequency value, and then, by using the first truncation duration, sample data with a duration equal to the first truncation duration is truncated from the first time domain signal data to obtain sample data with a predetermined duration, where the first truncation duration is less than or equal to the first sample duration, and when the output signal is an asymmetric signal in a single period, the first truncation duration is equal to an integer multiple of a period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the first truncation duration is equal to an integral multiple of half of the period value corresponding to the frequency value. Therefore, the output power of the output signal under the specific load is calculated according to the sampling data with the preset time length and the resistance value of the load connected with the equipment to be measured, the time length of the sampling data point near the zero point of the output signal in the sampling data with the preset time length can be ensured to be equal to the time length of the sampling data point near the peak point of the output signal, the problem that the calculation result is inaccurate in the existing method can be solved, the calculation precision can be improved, and the accuracy of the calculation result can be improved.
Fig. 11 is a schematic structural diagram of a signal power detection apparatus according to a first embodiment of the present application. The device can be realized by software, hardware or a combination of software and hardware, and the device can be a separate signal power detection device, and can also be other equipment integrated with the signal power detection device. As shown in fig. 11, the signal power detection apparatus provided in this embodiment may include: an acquisition module 100 and a processing module 200, wherein,
the obtaining module 100 is configured to obtain a frequency value of an output signal of a device to be tested;
the obtaining module 100 is further configured to obtain sampling data of a predetermined duration according to the frequency value of the output signal; when the output signal is an asymmetric signal in a single period, the preset time length is equal to integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetrical signal in a single period, the preset time length is equal to an integral multiple of half of the period value corresponding to the frequency value;
and the processing module 200 is configured to calculate the output power of the output signal under the load according to the sampling data of the predetermined time length and the resistance value of the load connected to the device to be tested.
The apparatus of this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 2, and the implementation principle and the technical effect are similar, which are not described herein again.
Further, the obtaining module 100 is specifically configured to collect the output signal according to a first sampling frequency and a first sampling duration to obtain first time domain signal data; performing Fourier transform on the first time domain signal data to obtain first frequency domain signal data corresponding to the first time domain signal data; determining a first peak point according to the ordinate value of the first frequency domain signal data; and determining a frequency value corresponding to the first peak point according to the first sampling frequency, the first sampling duration and the position information of the first peak point, and determining the frequency value corresponding to the first peak point as the frequency value of the output signal, wherein the first peak point is a data point with a maximum ordinate value in the first frequency domain signal data.
The apparatus of this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 3, and the implementation principle and the technical effect are similar, which are not described herein again.
Further, the obtaining module 100 is further specifically configured to determine a second sampling duration according to the frequency value of the output signal; acquiring the output signal according to a second sampling frequency and the second sampling time length to obtain sampling data of the preset time length; when the output signal is an asymmetric signal in a single period, the second sampling time length is equal to an integral multiple of a period value corresponding to the frequency value; and when the output signal is a symmetrical signal in a single period, the second sampling time length is equal to the integral multiple of half of the period value corresponding to the frequency value.
Further, the obtaining module 100 is further specifically configured to determine a first truncation time according to the frequency value of the output signal; selecting sampling data with the duration equal to the first truncation duration from the first time domain signal data to obtain sampling data with the preset duration; the first truncation duration is less than or equal to the first sampling duration, and when the output signal is an asymmetric signal in a single period, the first truncation duration is equal to an integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the first truncation duration is equal to an integral multiple of half of the period value corresponding to the frequency value.
Fig. 12 is a schematic structural diagram of a first embodiment of the signal power detection apparatus according to the present application. Referring to fig. 12, the signal power detection apparatus provided in this embodiment includes: an analog-to-digital converter ADC acquisition circuit 600 and a micro control Unit 700 (MCU for short), wherein,
the ADC acquisition circuit 600 is configured to acquire an output signal of a device to be tested under the control of the MCU 700;
the MCU700 is configured to obtain a frequency value of the output signal; acquiring sampling data of a preset time length according to the frequency value of the output signal; calculating the output power of the output signal under the load according to the sampling data of the preset time length and the resistance value of the load connected with the equipment to be tested; when the output signal is an asymmetric signal in a single period, the preset time length is equal to integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the predetermined time length is equal to an integral multiple of half of the period value corresponding to the frequency value.
The device of this embodiment may be configured to execute the technical solution of the method embodiment shown in fig. 2, and the implementation principle and the technical effect are similar, which are not described herein again.
Further, the ADC acquisition circuit 600 is specifically configured to acquire the output signal according to a first sampling frequency and a first sampling duration to obtain first time domain signal data;
the MCU700 is specifically configured to perform fourier transform on the first time domain signal data to obtain first frequency domain signal data corresponding to the first time domain signal data; determining a first peak point according to the ordinate value of the first frequency domain signal data; determining a frequency value corresponding to the first peak point according to the first sampling frequency, the first sampling duration and the position information of the first peak point, and determining the frequency value corresponding to the first peak point as the frequency value of the output signal; the first peak point is a data point with a maximum ordinate value in the first frequency domain signal data.
The device of this embodiment may be configured to execute the technical solution of the method embodiment shown in fig. 3, and the implementation principle and the technical effect are similar, which are not described herein again.
Further, the MCU700 is further configured to determine a second sampling duration according to the frequency value of the output signal; when the output signal is an asymmetric signal in a single period, the second sampling time length is equal to integral multiple of the period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the second sampling time length is equal to an integral multiple of half of the period value corresponding to the frequency value;
the ADC acquisition circuit 600 is further configured to acquire the output signal according to a second sampling frequency and the second sampling duration under the control of the MCU600, so as to obtain the sampling data of the predetermined duration.
Further, the MCU700 is further configured to determine a first truncation time according to the frequency value of the output signal; and selecting sampling data with the duration equal to the first truncation duration from the first time domain signal data to obtain the sampling data with the preset duration. The first truncation duration is less than or equal to the first sampling duration, and when the output signal is an asymmetric signal in a single period, the first truncation duration is equal to an integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the first truncation duration is equal to an integral multiple of half of the period value corresponding to the frequency value.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (9)
1. A method for signal power detection, comprising:
acquiring an output signal of equipment to be tested according to a first sampling frequency and a first sampling duration, and acquiring a frequency value of the output signal, wherein the first sampling frequency is more than 2 times of the maximum frequency of the output signal;
acquiring sampling data of a preset time length according to the frequency value of the output signal; when the output signal is an asymmetric signal in a single period, the preset time length is equal to integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetrical signal in a single period, the preset time length is equal to an integral multiple of half of the period value corresponding to the frequency value; acquiring sampling data of a predetermined time duration according to the frequency value of the output signal comprises: determining a second sampling duration according to the frequency value of the output signal, and acquiring sampling data of the preset duration based on the second sampling duration and a second sampling frequency, wherein the second sampling frequency is greater than 2 times of the carrier frequency of the output signal;
and calculating the output power of the output signal under the load according to the sampling data of the preset time length and the resistance value of the load connected with the equipment to be tested.
2. The method according to claim 1, wherein acquiring an output signal of a device under test according to a first sampling frequency and a first sampling duration to obtain a frequency value of the output signal comprises:
acquiring the output signal according to a first sampling frequency and a first sampling duration to obtain first time domain signal data;
performing Fourier transform on the first time domain signal data to obtain first frequency domain signal data corresponding to the first time domain signal data;
determining a first peak point according to the ordinate value of the first frequency domain signal data; the first peak point is a data point with the maximum longitudinal coordinate value in the first frequency domain signal data;
and determining a frequency value corresponding to the first peak point according to the first sampling frequency, the first sampling duration and the position information of the first peak point, and determining the frequency value corresponding to the first peak point as the frequency value of the output signal.
3. The method of claim 2, wherein determining a second sampling duration based on the frequency value of the output signal, and obtaining the sampling data for the predetermined duration based on the second sampling duration and the second sampling frequency specifically comprises:
determining a second sampling duration according to the frequency value of the output signal; when the output signal is an asymmetric signal in a single period, the second sampling time length is equal to an integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the second sampling time length is equal to an integral multiple of half of the period value corresponding to the frequency value;
and acquiring the output signal according to a second sampling frequency and the second sampling time length to obtain sampling data of the preset time length.
4. The method of claim 2, wherein obtaining sample data for a predetermined period of time based on the frequency value of the output signal further comprises:
determining a first truncation duration according to the frequency value of the output signal; the first truncation duration is less than or equal to the first sampling duration, and when the output signal is an asymmetric signal in a single period, the first truncation duration is equal to an integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetrical signal in a single period, the first truncation duration is equal to an integral multiple of half of the period value corresponding to the frequency value;
and selecting sampling data with the duration equal to the first truncation duration from the first time domain signal data to obtain the sampling data with the preset duration.
5. The method according to any one of claims 1 to 4, wherein the device under test is a speaker circuit board of a television set.
6. The method of claim 2, wherein the first sampling duration is equal to a number of samples divided by the first sampling frequency, wherein the number of samples is an integer power of 2.
7. A signal power detection apparatus, comprising: the device comprises an acquisition module and a processing module, wherein the acquisition module is used for acquiring an output signal of a device to be tested according to a first sampling frequency and a first sampling duration, and acquiring a frequency value of the output signal, wherein the first sampling frequency is greater than 2 times of the maximum frequency of the output signal;
the acquisition module is further used for acquiring sampling data of a preset time length according to the frequency value of the output signal; when the output signal is an asymmetric signal in a single period, the preset time length is equal to integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetrical signal in a single period, the preset time length is equal to an integral multiple of half of the period value corresponding to the frequency value; acquiring sampling data of a predetermined time duration according to the frequency value of the output signal comprises: determining a second sampling duration according to the frequency value of the output signal, and acquiring sampling data of the preset duration based on the second sampling duration and a second sampling frequency, wherein the second sampling frequency is greater than 2 times of the carrier frequency of the output signal;
and the processing module is used for calculating the output power of the output signal under the load according to the sampling data of the preset time length and the resistance value of the load connected with the equipment to be tested.
8. A signal power detection device, comprising: an analog-to-digital converter ADC acquisition circuit and a micro control unit MCU, wherein,
the ADC acquisition circuit is used for acquiring an output signal of the equipment to be detected according to a first sampling frequency and a first sampling duration under the control of the MCU, wherein the first sampling frequency is more than 2 times of the maximum frequency of the output signal;
the MCU is used for acquiring the frequency value of the output signal; acquiring sampling data of a preset time length according to the frequency value of the output signal; calculating the output power of the output signal under the load according to the sampling data of the preset time length and the resistance value of the load connected with the equipment to be tested; when the output signal is an asymmetric signal in a single period, the preset time length is equal to integral multiple of a period value corresponding to the frequency value; when the output signal is a symmetric signal in a single period, the predetermined duration is equal to an integral multiple of half of a period value corresponding to the frequency value, and obtaining sampling data of the predetermined duration according to the frequency value of the output signal comprises: and determining a second sampling time length according to the frequency value of the output signal, and acquiring the sampling data of the preset time length based on the second sampling time length and a second sampling frequency, wherein the second sampling frequency is more than 2 times of the carrier frequency of the output signal.
9. The apparatus of claim 8,
the ADC acquisition circuit is specifically used for acquiring the output signal according to a first sampling frequency and a first sampling duration to obtain first time domain signal data;
the MCU is specifically used for carrying out Fourier transform on the first time domain signal data to obtain first frequency domain signal data corresponding to the first time domain signal data; determining a first peak point according to the ordinate value of the first frequency domain signal data; determining a frequency value corresponding to the first peak point according to the first sampling frequency, the first sampling duration and the position information of the first peak point, and determining the frequency value corresponding to the first peak point as the frequency value of the output signal; the first peak point is a data point with a maximum ordinate value in the first frequency domain signal data.
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| CN102445595B (en) * | 2011-09-23 | 2013-11-13 | 重庆大学 | Real-time measuring method for time-varying power of electrical power system |
| CN103458430B (en) * | 2012-05-31 | 2016-08-10 | 京信通信系统（中国）有限公司 | The power detecting method of GSM time slot signal and power-sensing circuit |
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