CN107219393A - A kind of signal power detection method, device and equipment - Google Patents
A kind of signal power detection method, device and equipment Download PDFInfo
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- CN107219393A CN107219393A CN201710397748.3A CN201710397748A CN107219393A CN 107219393 A CN107219393 A CN 107219393A CN 201710397748 A CN201710397748 A CN 201710397748A CN 107219393 A CN107219393 A CN 107219393A
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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 kind of signal power detection method, device and equipment.The signal power detection method that the application is provided, including：Obtain the frequency values of the output signal of Devices to test；According to the frequency values of the output signal, the sampled data of scheduled duration is obtained；The resistance value for the load being connected according to the sampled data of the scheduled duration and with the Devices to test, calculates power output of the output signal under the load；Wherein, when the output signal is asymmetrical signals in the monocycle, the scheduled duration is equal to the integral multiple of the corresponding periodic quantity of the frequency values；When the output signal is symmetric signal in the monocycle, the scheduled duration is equal to the integral multiple of the corresponding periodic quantity half of the frequency values.Signal power detection method, device and equipment that the application is provided, can accurately detect the power output of output signal.
Description
Technical field
The application is related to signal detection field, more particularly to a kind of signal power detection method, device and equipment.
Background technology
In the production process of TV set circuit plate, to ensure the qualification rate of product, it is necessary to detect the defeated of loudspeaker circuit board
Go out power, determining that power output makes loudspeaker noiseless as zero or power output is excessive using the power output by detecting may
Burn the unqualified circuit board of loudspeaker.
Because the resistance of loudspeaker is fixed, at present, when detecting the power output of loudspeaker circuit board, by gathering loudspeaker
The magnitude of voltage of the output signal of circuit board, so by the magnitude of voltage of the output signal collected square to collection duration integration,
The resistance value of obtained value divided by loudspeaker will be integrated again, and power output of the loudspeaker circuit board under loudspeaker is obtained to calculate.
However, when gathering the magnitude of voltage of output signal of loudspeaker circuit board, in order that the signal collected can be serious
Real goes back original output signal, it is necessary to which frequency acquisition is set as into more than 2 times of output signal frequency, so, when by frequency acquisition
Setting it is higher when, due to acquisition system memory data output and data processing amount limitation, it is necessary to will the setting of collection duration very
It is short, one or several cycles of output signal are generally only included in collection duration.So, when collection duration is shorter, sampled point
Adopt and the time near output signal peak point is adopted possibly more than sampled point in the time of output signal zero crossings, either,
Sampled point, which is adopted, to be possibly less than sampled point in the time of output signal zero crossings and adopts time near output signal peak point.And
When calculating power output using existing method, because the length of integrating range is sampling duration, so, cause what is calculated
Power output and real output deviation are larger, and the power output calculated is inaccurate (when sampled point is adopted in output signal zero
When time near point adopts the time near output signal peak point more than sampled point, the power output calculated is compared to reality
Border power output is relatively low；And adopt and adopted in the time of output signal zero crossings less than sampled point in output signal peak value when sampled point
When putting the neighbouring time, the power output calculated is higher compared to real output).
The content of the invention
In view of this, the application provides a kind of signal power detection method, device and equipment, to solve existing signal work(
The problem of accuracy that rate detection method is present is low.
The application first aspect provides a kind of signal power detection method, including：
Obtain the frequency values of the output signal of Devices to test；
According to the frequency values of the output signal, the sampled data of scheduled duration is obtained；Wherein, when the output signal is
In monocycle during asymmetrical signals, the scheduled duration is equal to the integral multiple of the corresponding periodic quantity of the frequency values；When described defeated
Go out signal for during symmetric signal, the scheduled duration is equal to the integer of the corresponding periodic quantity half of the frequency values in the monocycle
Times；
The resistance value for the load being connected according to the sampled data of the scheduled duration and with the Devices to test, calculates described
Power output of the output signal under the load.
Further, the frequency values of the output signal for obtaining Devices to test, are specifically included：
According to output signal described in the first sample frequency and the first sampling duration collection, the first time-domain signal data are obtained；
The first time-domain signal data are subjected to Fourier transformation, the corresponding first frequency domain letter of the first time-domain signal data is obtained
Number；
According to the ordinate value of first frequency-domain signal data, the first peak point is determined；Wherein, first peak point
For the data point that ordinate value in first frequency-domain signal data is maximum；
According to the positional information of first sample frequency, the first sampling duration and first peak point, it is determined that
The corresponding frequency values of first peak point, and the corresponding frequency values of first peak point are defined as the output signal
Frequency values.
Further, the frequency values according to the output signal, obtain the sampled data of scheduled duration, specific bag
Include：
According to the frequency values of the output signal, the second sampling duration is determined；Wherein, when the output signal is the monocycle
During interior asymmetrical signals, the second sampling duration is equal to the integral multiple of the corresponding periodic quantity of the frequency values；When the output
When signal is symmetric signal in the monocycle, the second sampling duration is equal to the integer of the corresponding periodic quantity half of the frequency values
Times；
According to output signal described in the second sample frequency and the second sampling duration collection, the scheduled duration is obtained
Sampled data.
Further, the frequency values according to the output signal, obtain the sampled data of scheduled duration, specific bag
Include：
According to the frequency values of the output signal, the first interception duration is determined；Wherein, it is described first interception duration be less than or
Person is equal to the described first sampling duration, and when the output signal is asymmetrical signals in the monocycle, during first interception
The long integral multiple equal to the corresponding periodic quantity of the frequency values；It is described when the output signal is symmetric signal in the monocycle
First interception duration is equal to the integral multiple of the corresponding periodic quantity half of the frequency values；
The sampled data that duration is equal to the described first interception duration is chosen in the first time-domain signal data, institute is obtained
State the sampled data of scheduled duration.
Further, the Devices to test is the loudspeaker circuit board of television set.
Further, the first sampling duration is equal to sampling number divided by first sample frequency, wherein, it is described to adopt
Number of samples is 2 integer power.
Further, two times of second sample frequency more than the carrier frequency of the output signal.
The application second aspect provides a kind of signal power detection means, including：Acquisition module and processing module, wherein,
The acquisition module, the frequency values of the output signal for obtaining Devices to test；
The acquisition module, is additionally operable to the frequency values according to the output signal, obtains the sampled data of scheduled duration；Its
In, when the output signal is asymmetrical signals in the monocycle, the scheduled duration is equal to the frequency values corresponding cycle
The integral multiple of value；When the output signal is symmetric signal in the monocycle, the scheduled duration is equal to frequency values correspondence
Periodic quantity half integral multiple；
The processing module, the load being connected for the sampled data according to the scheduled duration and with the Devices to test
Resistance value, calculate the power output of the output signal under the load.
The application third aspect provides a kind of signal power measuring equipment, including：Analog-digital converter ADC Acquisition Circuits and micro-
Control unit MCU, wherein,
The ADC Acquisition Circuits, the output signal for gathering Devices to test under the control of the MCU；
The MCU, the frequency values for obtaining the output signal；And according to the frequency values of the output signal, obtain
The sampled data of scheduled duration；And sampled data according to the scheduled duration and the load that is connected with the Devices to test
Resistance value, calculates power output of the output signal under the load；Wherein, when the output signal is non-in the monocycle
During symmetric signal, the scheduled duration is equal to the integral multiple of the corresponding periodic quantity of the frequency values；When the output signal is single
In cycle during symmetric signal, the scheduled duration is equal to the integral multiple of the corresponding periodic quantity half of the frequency values.
Further, the ADC Acquisition Circuits, specifically for according to the first sample frequency and the first sampling duration collection institute
Output signal is stated, the first time-domain signal data are obtained；
The MCU, specifically for the first time-domain signal data are carried out into Fourier transformation, obtains first time domain
Corresponding first frequency-domain signal data of signal data；And according to the ordinate value of first frequency-domain signal data, determine first
Peak point；And the positional information of sampled according to first sample frequency, described first duration and first peak point, really
Determine the corresponding frequency values of first peak point, and the corresponding frequency values of first peak point are defined as the output signal
Frequency values；Wherein, first peak point is the data point of ordinate value maximum in first frequency-domain signal data.
Signal power detection method, device and equipment that the application is provided, by the output signal for obtaining Devices to test
Frequency values, and then based on the frequency values of the output signal got, the sampled data of scheduled duration is obtained, so that according to above-mentioned pre-
The long sampled data of timing and the resistance value for the load being connected with above-mentioned Devices to test, calculate above-mentioned output signal in above-mentioned load
Under power output, wherein, when output signal be the monocycle in asymmetrical signals when, scheduled duration be equal to said frequencies value correspondingly
Periodic quantity integral multiple；When output signal is symmetric signal in the monocycle, it is corresponding that scheduled duration is equal to said frequencies value
The integral multiple of periodic quantity half.So, due in the sampled data of scheduled duration, adopting the hits in output signal zero crossings
The duration at strong point and the duration for adopting the sampled data points near output signal peak point are of substantially equal, accordingly, it is possible to resolve existing
Signal power detection method calculate power output when, because of the sampled data points and the hits of zero crossings near peak point
The problem of result of calculation that the duration difference at strong point is caused greatly very much is inaccurate, can accurately get the output work of output signal
Rate.
Brief description of the drawings
The application scenarios schematic diagram of signal power detection method, device and equipment that Fig. 1 provides for the application；
Fig. 2 is the flow chart of the application signal power detection method embodiment one；
Fig. 3 is the flow chart of the application signal power detection method embodiment two；
Fig. 4 is the corresponding oscillogram of the first time-domain signal data shown in an exemplary embodiment；
Fig. 5 is the corresponding oscillogram of corresponding first frequency-domain signal data of the first time-domain signal data shown in Fig. 4；
Fig. 6 is the flow chart of the application signal power detection method embodiment three；
Fig. 7 is the corresponding oscillogram of sampled data of the scheduled duration shown in an exemplary embodiment；
Fig. 8 is the corresponding oscillogram of sampled data of the scheduled duration shown in another exemplary embodiment；
Fig. 9 is the corresponding oscillogram of sampled data of the scheduled duration shown in further example embodiment；
Figure 10 is the flow chart of the application signal power detection method example IV；
Figure 11 is the structural representation of the application signal power detection means embodiment one；
Figure 12 is the structural representation of the application signal power measuring equipment embodiment one.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects be described in detail in claims, the application.
It is the purpose only merely for description specific embodiment in term used in this application, and is not intended to be limiting the application.
" one kind ", " described " and "the" of singulative used in the application and appended claims are also intended to including majority
Form, unless context clearly shows that other implications.It is also understood that term "and/or" used herein refers to and wrapped
It may be combined containing one or more associated any or all of project listed.
It should be noted that term " first " " second " in the description and claims of this application and accompanying drawing etc. is
The similar object for distinguishing, without for describing specific order or precedence.It should be appreciated that such use
It can exchange in appropriate circumstances.
The application provides a kind of signal power detection method, device and equipment, to solve existing signal power detection side
The problem of accuracy that method is present is low.
Signal power detection method, device and equipment that the application is provided, can be applied to every field, to detect output letter
Power output number under specific load.For example, signal power detection method, device and equipment that Fig. 1 provides for the application
Application scenarios schematic diagram.Fig. 1 is refer to, signal power detection method, device and equipment that the application is provided can be applied to TV
Machine field, with the accurate loudspeaker for detecting television set of the signal power detection method, device and the equipment that are provided by the application
The power output of circuit board, and then unqualified circuit board is identified based on the power output detected.
The technical scheme of the application is described in detail with specific embodiment below.These specific implementations below
Example can be combined with each other, and may be repeated no more for same or analogous concept or process in some embodiments.
Fig. 2 is the flow chart of the application signal power detection method embodiment one.The executive agent of the embodiment of the present application can
To be single signal power detection means or be integrated with the signal power measuring equipment of signal power detection means.
The embodiment of the present application is illustrated so that executive agent is to be integrated with the signal power measuring equipment of signal power detection means as an example.
Fig. 2 is refer to, the signal power detection method that the present embodiment is provided may include steps of：
S101, the output signal of acquisition Devices to test frequency values.
It should be noted that Devices to test can be any equipment for needing to measure power output, for example, it may be TV
The loudspeaker circuit board of machine, loudspeaker circuit board of computer etc..Reference picture 1, below using Devices to test as the loudspeaker circuit board of television set
Exemplified by, the signal power detection method of the application offer is provided.In addition, the output signal of Devices to test is periodic signal,
And the output signal of Devices to test can be asymmetrical signals or symmetric signal in the monocycle in the monocycle.With reference to upper
The example in face, when Devices to test is the loudspeaker circuit board of television set, output signal is that (i.e. output signal is single-revolution to sinusoidal signal
Symmetric signal in phase).
Specifically, in a kind of possible implementation of the application, Devices to test can be obtained by the following method
The frequency values of output signal, specifically, this method may include steps of：(1) sent out to the headend equipment of the Devices to test
Frequency values are sent to obtain instruction, wherein, above-mentioned headend equipment is the equipment that above-mentioned output signal is inputted to above-mentioned Devices to test；(2)
The feedback signal that the headend equipment is sent is received, wherein, the feedback signal carries the frequency values of the output signal.This
Sample, based on above-mentioned steps, just can be accurately obtained the frequency values of output signal.For example, in this embodiment, passing through above-mentioned side
Method, the frequency values for getting the output signal of the loudspeaker circuit board of television set are 150Hz.
S102, the frequency values according to above-mentioned output signal, obtain the sampled data of scheduled duration；Wherein, when above-mentioned output
When signal is asymmetrical signals in the monocycle, above-mentioned scheduled duration is equal to the integral multiple that said frequencies are worth corresponding periodic quantity；When
When above-mentioned output signal is symmetric signal in the monocycle, above-mentioned scheduled duration is equal to said frequencies and is worth corresponding periodic quantity half
Integral multiple.
Specifically, introducing the technical scheme of the present embodiment for convenience, scheduled duration is designated as L (unit is s), output is believed
Number frequency values be designated as f0(unit is Hz), T (wherein, T=1/f are designated as by the periodic quantity of output signal0Second).So, output is worked as
When signal is asymmetrical signals in the monocycle, scheduled duration is equal to the integral multiple that said frequencies are worth corresponding periodic quantity, i.e. L=
NT, wherein, N is positive integer.For example, N can be equal to 12.In the present embodiment, by the way that scheduled duration is set as into output signal
The integral multiple of periodic quantity, and based on the scheduled duration set, obtain the sampled data of scheduled duration.So, it is ensured that upper
In the sampled data for stating scheduled duration, adopt the duration of the sampled data points near output signal peak point and adopt in output signal
Zero crossings sampled data points duration it is of substantially equal.
Correspondingly, when output signal is symmetric signal in the monocycle, scheduled duration is equal to said frequencies and is worth corresponding week
The integral multiple of time value half, i.e. L=NT/2, wherein, N is positive integer.For example, N can be equal to 1.It is (to be measured with reference to above example
Equipment is the loudspeaker circuit board of television set, and the output signal of the loudspeaker circuit board of television set is for sinusoidal signal, i.e. output signal
Symmetric signal in monocycle, and get the loudspeaker circuit board of television set output signal frequency values be equal to 150Hz), this
In embodiment, scheduled duration can be equal to 1/300 second.It should be noted that when output signal is symmetric signal in the monocycle,
Now, it can be seen from rating formula, the magnitude of voltage of output signal is carried out after square operation, the magnitude of voltage of output signal
Square cycle be equal to output signal magnitude of voltage cycle half (i.e. by the magnitude of voltage of output signal progress square operation
Afterwards, the cycle of the square value of the magnitude of voltage of output signal is equal to T/2 (periodic quantity of output signal is equal to T)).So, this
In the case of, when output signal is symmetric signal in the monocycle, it is only necessary to which scheduled duration is set as to the periodic quantity of output signal
The integral multiple of half, you can ensure in the sampled data of above-mentioned scheduled duration, adopts adopting near the peak point of output signal
The duration of sample data point and the duration adopted in the sampled data points of the zero crossings of output signal are of substantially equal.
It should be noted that the class of output signal can be obtained by way of being said the word to the headend equipment of Devices to test
Type (determines that output signal is symmetric signal or asymmetrical signals in the monocycle in the monocycle), or the number based on collection
According to the type for determining output signal.
More specifically,, can when obtaining the sampled data of scheduled duration in the frequency values according to output signal in this step
To be realized by the following method.For example, in a kind of possible implementation, sampling duration can be set as into above-mentioned pre- timing
It is long, then sampled according to the sampling duration set, to obtain the sampled data of scheduled duration.For another example alternatively possible
Implementation in, can according to it is default sampling duration sampling, the sampled data of output signal is obtained, then from the collection
To sampled data in choose scheduled duration sampled data.The specific of this step will be discussed in detail with specific embodiment below
Implementation process, here is omitted.
It should be noted that above-mentioned sampled data can gather the sampled data that the voltage of output signal is worth to,
Can gather the sampled data that the electric current of output signal is worth to.In the present embodiment, using sampled data as collection output signal
The sampled data that is worth to of voltage exemplified by illustrate.
S103, the sampled data according to above-mentioned scheduled duration and the load being connected with above-mentioned Devices to test resistance value, meter
Count in stating power output of the output signal under above-mentioned load.
Specifically, when the sampled data that sampled data is worth to for the voltage of collection output signal, in this step, can press
The power output of output signal under specific load is calculated according to formula (1).
Wherein, P is power output；
X (n) for scheduled duration sampled data in nth strong point ordinate value；
L is sampling duration；
R is the resistance value of load.
It should be noted that when the sampled data that sampled data is worth to for the electric current of collection output signal, can use
Corresponding rating formula calculates the power output of output signal under specific load.
In this implementation, when calculating the power output of output signal under specific load, by obtaining the defeated of Devices to test
Go out the frequency values of signal, and then based on the frequency values of the output signal got, obtain the sampled data of scheduled duration, wherein,
When output signal is asymmetrical signals in the monocycle, scheduled duration is equal to the integral multiple that said frequencies are worth corresponding periodic quantity；
When output signal is symmetric signal in the monocycle, scheduled duration is equal to the integer that said frequencies are worth corresponding periodic quantity half
Times.So, in the sampled data according to scheduled duration and the resistance value for the load being connected with above-mentioned Devices to test, output letter is calculated
During power output number under a load, it is ensured that in the sampled data of above-mentioned scheduled duration, adopt the peak point in output signal
The duration of neighbouring sampled data points and the duration adopted in the sampled data points of the zero crossings of output signal are of substantially equal, can solve
Certainly existing method is when calculating power output, because adopting the duration of the sampled data points near the peak point of output signal and adopting
The problem of the result of calculation that the duration difference of the sampled data points of the zero crossings of output signal is caused greatly very much is inaccurate, it can carry
High computational accuracy, improves the accuracy of result of calculation (power output and real output deviation calculated is little).
The signal power detection method that the present embodiment is provided, the frequency values of the output signal by obtaining Devices to test enter
And based on the frequency values of the output signal got, the sampled data of scheduled duration is obtained, so that according to above-mentioned scheduled duration
Sampled data and the resistance value for the load being connected with above-mentioned Devices to test, calculate output of the above-mentioned output signal under above-mentioned load
Power, wherein, when output signal is asymmetrical signals in the monocycle, scheduled duration is equal to said frequencies and is worth corresponding periodic quantity
Integral multiple；When output signal is symmetric signal in the monocycle, scheduled duration is equal to said frequencies and is worth corresponding periodic quantity one
Half integral multiple.So, the power output of output signal under a load can accurately be got.
Fig. 3 is the flow chart of the application signal power detection method embodiment two.The present embodiment refers to how to obtain
The detailed process of the frequency values of the output signal of Devices to test.On the basis of embodiment one, step S101 is specifically included：
S201, the above-mentioned output signal of duration collection of being sampled according to the first sample frequency and first, obtain the first time-domain signal
Data.
Specifically, being provided with acquisition module in signal power detection means, Devices to test is obtained using acquisition module
Output signal.When implementing, acquisition module can by analog-digital converter (Analog-to-Digital Converter,
Abbreviation ADC) Acquisition Circuit realization.
It should be noted that according to sampling thheorem, to utilize the undistorted recovery original signal of sampled signal, sample frequency should
More than 2 times of original signal highest frequency.Therefore, in the present embodiment, the first sample frequency should be greater than the 2 of output signal highest frequency
Times.For example, in the present embodiment, when Devices to test is the loudspeaker circuit board of television set, output signal is a voice signal, sound
The frequency of message number is between 20Hz to 20KHz, therefore, and the first sample frequency minimum should be two times of 20KHz, i.e., first adopts
Sample frequency should be greater than 40KHz.For example, the first sample frequency can be 48KHz.It should be noted that defeated accurately to determine
Go out the frequency values of signal, the first sample frequency should be made the smaller the better.
Further, the first sampling duration is that user sets according to actual needs.Specifically, user can be according to signal
Data storage capacities, data-handling capacity and the first sample frequency of power detection device determine the first sampling duration.Alternatively,
In the possible implementation of the application one, the need for coordinating Fourier transformation, can be determined using following methods
One sampling duration, i.e., the first sampling duration is equal to sampling number divided by above-mentioned first sample frequency, wherein, above-mentioned sampling number is
2 integer power.Further, in the present embodiment, in order to take into account the data storage of computational accuracy and signal power detection means
Ability, can be defined as 4096 by sampling number.So, with reference to above example, when the first sample frequency is 48KHz, first
(in the sampling duration, 4096 data points can be gathered) a length of 4096/48000 second during sampling.
With reference to above example, when the first sample frequency is 48KHz, a length of 4096/48000 second during the first sampling, this
When, during according to the first sample frequency and the first sampling above-mentioned output signal of duration collection, collecting the first time-domain signal data can
Using (Fig. 4 is the corresponding oscillogram of the first time-domain signal data shown in an exemplary embodiment) as shown in Figure 4.
S202, by above-mentioned first time-domain signal data carry out Fourier transformation, obtain above-mentioned first time-domain signal data pair
The first frequency-domain signal data answered.
Specifically, in this step, first, the first time-domain signal data are carried out into Fourier transformation, the first time domain letter is obtained
Corresponding first frequency-domain signal data of number.It should be noted that implementing process and realization about Fourier transformation
Principle may refer to description of the prior art, not repeat herein.For example, in the present embodiment, when by shown in Fig. 4 first when
Domain signal data obtains the first frequency-domain signal data as shown in Figure 5 (specifically, Fig. 5 shows for Fig. 4 after Fourier transformation
The corresponding oscillogram of corresponding first frequency-domain signal data of the first time-domain signal data gone out).It should be noted that due to time domain
Signal data is real number, and the front and rear two halves partial data of its frequency-domain signal data obtained after Fourier transformation is symmetrical, because
This, in this embodiment, time-domain signal data only take first half.
S203, the ordinate value according to above-mentioned first frequency-domain signal data, determine the first peak point；Wherein, above-mentioned first
Peak point is the data point of ordinate value maximum in above-mentioned first frequency-domain signal data.
Specifically, after the first time-domain signal data are carried out into Fourier transformation, obtaining the first time-domain signal data correspondence
The first frequency-domain signal data after, in first frequency-domain signal data, there are several peak points and (referring to Fig. 5, there are two peaks
It is worth point), now, according to the ordinate value of the first frequency-domain signal data, determine the first peak point.It should be noted that first peak
Value point is the data point of ordinate maximum in the first frequency-domain signal data.With reference to Fig. 5, in the present embodiment, the first peak point is
In first frequency-domain signal data the 13rd data point (referring to Fig. 5, the first peak point is that peak point in left side in Fig. 5, its
In, 13 be the positional information of the data point).
S204, the positional information according to above-mentioned first sample frequency, above-mentioned first sampling duration and above-mentioned first peak point,
The corresponding frequency values of above-mentioned first peak point are determined, and the corresponding frequency values of above-mentioned first peak point are defined as above-mentioned output letter
Number frequency values.
It should be noted which sampled data points are the positional information of the first peak point characterize first peak point for,
For example, with reference to above example, when the positional information of the first peak point is 13, it is the 13rd sampling to characterize first peak point
Data point.
Specifically, implementing process for clearly introduce this step, the first sample frequency is designated as A, the first sampling
Duration is designated as t, and the corresponding positional information of the first peak point is designated as m, and the corresponding frequency values of the first peak point are designated as f.Now, first
The corresponding frequency values f of peak point is calculated according to equation below：I.e.
With reference to above example, in the present embodiment, calculating obtains the corresponding frequency values f of first peak value point and is equal to
(152.34375Hz f=13*48000/4096=152.34375Hz).So, when calculating obtains the corresponding frequency of first peak value point
After rate value, just by the corresponding frequency values of the first peak point be defined as output signal frequency values (by this method get it is defeated
Go out the frequency values of signal and the actual frequency values (150Hz) of output signal are more or less the same).
The signal power detection method that the present embodiment is provided, it is first when obtaining the frequency values of output signal of Devices to test
Elder generation obtains the first time-domain signal data, then by inciting somebody to action according to the first sample frequency and the first sampling duration collection output signal
First time-domain signal data carry out Fourier transformation, obtain the corresponding first frequency-region signal number of above-mentioned first time-domain signal data
According to, and then based on the frequency values of the first frequency-domain signal data acquisition output signal.So, accurate output signal can be got
Frequency values, and then frequency values based on the output signal got obtain the sampled data of scheduled duration, so as to according to pre-
The long sampled data of timing and the resistance value for the load being connected with Devices to test, calculate the output of output signal under specific load
Power.So, computational accuracy can be improved, the accuracy of result of calculation is improved.
Two specific embodiments are given below, the signal power detection method for the application offer to be discussed in detail.
Fig. 6 is the flow chart of the application signal power detection method embodiment three.The present embodiment refers to signal power
The whole process of detection method.Fig. 6 is refer to, the signal power detection method that the present embodiment is provided may include steps of：
S301, the output signal of acquisition Devices to test frequency values.
It should be noted that the step implement process and realization principle may refer to step S101 in embodiment one
Description or embodiment two description, will not be repeated here.
Specifically, the present embodiment is illustrated by taking the method introduced in embodiment two as an example.So, in the present embodiment, warp
Step S201 to S204 is crossed, the frequency values for getting the output signal of Devices to test are 152.34375Hz.
S302, the frequency values according to above-mentioned output signal, determine the second sampling duration；Wherein, when above-mentioned output signal is
In monocycle during asymmetrical signals, the second sampling duration is equal to the integral multiple that said frequencies are worth corresponding periodic quantity；When above-mentioned defeated
Go out signal for during symmetric signal, above-mentioned second sampling duration is equal to said frequencies and is worth the whole of corresponding periodic quantity half in the monocycle
Several times.
Specifically, after the frequency values of output signal are got by step S301, in the present embodiment, then being believed according to output
Number frequency values, the second sampling duration is determined, and then the based on determination second sampling duration further gathers output signal, to obtain
Take the sampled data of scheduled duration.
Specifically, in this step, in the frequency values according to output signal, when determining the second sampling duration, working as output signal
During asymmetrical signals, to determine that the second sampling duration is equal to the integral multiple of the corresponding periodic quantity of said frequencies value in the monocycle；When
When output signal is symmetric signal in the monocycle, determine that the second sampling duration is equal to the corresponding periodic quantity half of said frequencies value
Integral multiple.In the present embodiment, with reference to above example, the output signal of the loudspeaker circuit board of television set is sinusoidal signal, because
This, now, it may be determined that the second sampling duration is equal to the integral multiple that said frequencies are worth corresponding periodic quantity half.For example, this implementation
In example, it may be determined that the second sampling duration is equal to 0.003282 second (wherein, 0.003282=1/ (2*152.3437)).
S303, the above-mentioned output signal of duration collection of being sampled according to the second sample frequency and above-mentioned second, obtain scheduled duration
Sampled data.
Determined according to actual needs specifically, the second sample frequency is user.For example, in the present embodiment, second adopts
Sample frequency can be 48KHz.Alternatively, in a kind of possible implementation of the application, to reduce carrier wave to result of calculation
Second sample frequency, can be set greater than two times of the carrier frequency of output signal by influence.For example, in the present embodiment, the
Two sample frequencys can be 1MHz.
Below with second sample when a length of 0.003282 second, the second sample frequency be 1MHz exemplified by illustrate.Specifically,
After the second sampling duration (0.003282s) is determined by step S301, in this step, just according to the second sample frequency
(1MHz) and the second sampling duration (0.003282s) gather the output signal, obtain scheduled duration (0.003282s) sampling
Data.As shown in any one accompanying drawing in Fig. 7, Fig. 8, Fig. 9, wherein, Fig. 7, Fig. 8, Fig. 9 are respectively that an exemplary embodiment is shown
Scheduled duration the corresponding oscillogram of sampled data.It should be noted that Fig. 7, Fig. 8, Fig. 9 difference are to sample
Initial point is different, wherein, Fig. 7 is the sampled data obtained using zero point as first sampling point, and Fig. 8 is to be used as sampling using zero crossings
The sampled data that starting point is obtained, Fig. 9 is the sampled data obtained using near peak point as first sampling point.
S304, the sampled data according to above-mentioned scheduled duration and the load being connected with above-mentioned Devices to test resistance value, meter
Count in stating power output of the output signal under above-mentioned load.
It should be noted that the step implement process and realization principle may refer to step S103 in embodiment one
Description, do not repeating herein.
Specifically, with reference to above example, for example, for the sampled data shown in Fig. 7, calculating obtains output signal upper
The power output P0 stated under load is equal to 0.5528/R；For the sampled data shown in Fig. 8, calculating obtains output signal above-mentioned
Power output P1 under load is equal to 0.5505/R；For the sampled data shown in Fig. 9, calculating obtains output signal above-mentioned negative
Power output P2 under carrying is equal to 0.5394/R.It should be noted that when the method provided according to the present embodiment calculates output work
During rate, for Fig. 7, Fig. 8 and Fig. 9, the difference of the power output calculated be equal to 2.01% (wherein, 2.01%=(P1-P2)/
P0), difference is smaller, calculates obtained power output relatively accurate (i.e. for Fig. 7, Fig. 8 and Fig. 9, although first sampling point is not
Together, but using the present embodiment the smaller (reality output with Devices to test of difference for the power output that the method provided is calculated
Power difference is smaller, and result of calculation is more accurate)).
The signal power detection method that the present embodiment is provided, the frequency values of the output signal by obtaining Devices to test enter
And based on the frequency values of the output signal got, the second sampling duration is determined, so that according to the second sampling duration collection output
Signal, to obtain the sampled data of predetermined length, wherein, when above-mentioned output signal is asymmetrical signals in the monocycle, second
Duration of sampling is equal to the integral multiple that said frequencies are worth corresponding periodic quantity；When above-mentioned output signal is symmetric signal in the monocycle
When, above-mentioned second sampling duration is equal to the integral multiple that said frequencies are worth corresponding periodic quantity half.So, according to predetermined length
Sampled data and the load being connected with Devices to test resistance value, calculate power output of the output signal under above-mentioned load,
In the sampled data that scheduled duration can be ensured, adopt the sampled data points of the zero crossings of output signal duration and adopt output
The duration of sampled data points near the peak point of signal is of substantially equal, it is possible to resolve the result of calculation that existing method is present is forbidden
Really the problem of, computational accuracy can be improved, improve the accuracy of result of calculation.
Figure 10 is the flow chart of the application signal power detection method example IV.The present embodiment refers to signal power
The whole process of detection method.Figure 10 is refer to, the signal power detection method that the present embodiment is provided can include following step
Suddenly：
S401, according to the first sample frequency and first sampling duration collection Devices to test output signal, when obtaining first
Domain signal data.
S402, by above-mentioned first time-domain signal data carry out Fourier transformation, obtain above-mentioned first time-domain signal data pair
The first frequency-domain signal data answered.
S403, the ordinate value according to above-mentioned first frequency-domain signal data, determine the first peak point；Wherein, above-mentioned first
Peak point is the data point of ordinate value maximum in above-mentioned first frequency-domain signal data.
S404, the positional information according to above-mentioned first sample frequency, above-mentioned first sampling duration and above-mentioned first peak point,
The corresponding frequency values of above-mentioned first peak point are determined, and the corresponding frequency values of above-mentioned first peak point are defined as above-mentioned output letter
Number frequency values.
It should be noted that step S401 to S404 implement process and realization principle may refer to embodiment two
Step S201 to S204 description, is not being repeated herein.
S405, the frequency values according to above-mentioned output signal, determine the first interception duration；Wherein, above-mentioned first interception duration
Less than or equal to the above-mentioned first sampling duration, and when above-mentioned output signal is asymmetrical signals in the monocycle, above-mentioned first
Intercept duration and be equal to the integral multiple that said frequencies are worth corresponding periodic quantity；When above-mentioned output signal is symmetric signal in the monocycle
When, above-mentioned first interception duration is equal to the integral multiple that said frequencies are worth corresponding periodic quantity half.
Specifically, the first interception duration can be determined as follows, (technical scheme of the application, is incited somebody to action for convenience of description
First interception duration is designated as L1, and unit is the second), first, the periodic quantity of output signal can be determined according to the frequency values of output signal
T (continues referring to Fig. 3, with reference to above example, by step S401 to S404, determines the frequency of the output signal of Devices to test
Rate value is equal to 152.34375Hz, correspondingly, determines that the periodic quantity of output signal is equal to 1/152.34375 second), afterwards, according to such as
Lower formula determines the first interception duration L1, specifically, when output signal is asymmetrical signals in the monocycle, L1=nT, wherein,
N is positive integer.When output signal is symmetric signal in the monocycle, L=nT/2, wherein, n is positive integer.
It should be noted that in the present embodiment, the first interception duration is less than or equal to the first sampling duration.For example, working as
When output signal is sinusoidal signal, if the first sampling duration is more than aT/2 and (wherein, a is less than b, and a, b are phase less than bT/2
Adjacent positive integer) when, now, the first interception duration maximum only have to be equal to aT/2.Fig. 4 is continued referring to, for example, in the present embodiment
In, a length of 4096/48000 second during the first sampling, and pass through the frequency that step S401 to S404 determines the output signal of Devices to test
Rate value is 152.34375Hz, now, 25T/2 ＜ (4096/480000) ＜ 26T/2, therefore, now, and the first interception duration is maximum
It can take 25T/2 seconds, i.e., the first interception duration maximum can take 0.082s, and (the first interception duration can be equal to T/2, T, 3T/
2……、25T/2).It should be noted that when implementing, in order to make full use of the data point calculation output signal collected
Power output under specific load, typically taking the first interception duration to be equal to 0.082s, (the i.e. first interception duration takes it to take
Maximum in value).Illustrated below so that the first interception duration is equal to 0.082s as an example.
S406, in above-mentioned first time-domain signal data choose duration be equal to above-mentioned first interception duration sampled data,
Obtain the sampled data of scheduled duration.
Specifically, after the first interception duration is determined by step S405, in this step, just in the first time-domain signal number
It is equal to the sampled data of the above-mentioned first interception duration according to middle selection duration, obtains the sampled data of scheduled duration.Continue referring to
Fig. 4, with reference to above example, intercepts the sampled data that duration is equal to 0.082s, obtains the hits of scheduled duration in Fig. 4
According to.It should be noted that figure 4, it is seen that in the sampled data of the scheduled duration, the peak point adopted in output signal is attached
The duration of near sampled data points and the duration adopted in the sampled data points of the zero crossings of output signal are of substantially equal.
S407, the sampled data according to above-mentioned scheduled duration and the load being connected with above-mentioned Devices to test resistance value, meter
Count in stating power output of the output signal under above-mentioned load.
It should be noted that the step implement process and realization principle may refer to the step S103 of embodiment one
Description, here is omitted.
The signal power detection method that the present embodiment is provided, it is defeated being determined according to the first time-domain signal data collected
Go out after the frequency values of signal, further according to said frequencies value, determine the first interception duration, and then when being intercepted using above-mentioned first
It is long, the sampled data that duration is equal to the above-mentioned first interception duration is intercepted in above-mentioned first time-domain signal data, to be made a reservation for
The sampled data of duration, wherein, the first interception duration is less than or equal to the above-mentioned first sampling duration, and when above-mentioned output signal
For during asymmetrical signals, above-mentioned first interception duration is equal to the integral multiple that said frequencies are worth corresponding periodic quantity in the monocycle；When
When above-mentioned output signal is symmetric signal in the monocycle, above-mentioned first interception duration is equal to said frequencies and is worth corresponding periodic quantity one
Half integral multiple.So, in the sampled data according to scheduled duration and the resistance value for the load being connected with Devices to test, calculate defeated
Go out the power output of signal under specific load, it is ensured that in the sampled data of scheduled duration, the zero point adopted in output signal is attached
The duration of near sampled data points is equal with the duration for adopting the sampled data points near the peak point of output signal, it is possible to resolve existing
With the presence of method result of calculation it is inaccurate the problem of, can improve computational accuracy, improve the accuracy of result of calculation.
Figure 11 is the structural representation of the application signal power detection means embodiment one.The device can by software,
Hardware or the mode of soft or hard combination are realized, and the device can be single signal power detection means or integrated
The other equipment of signal power detection means.As shown in figure 11, the signal power detection means that the present embodiment is provided, can be wrapped
Include：Acquisition module 100 and processing module 200, wherein,
The acquisition module 100, the frequency values of the output signal for obtaining Devices to test；
The acquisition module 100, is additionally operable to the frequency values according to the output signal, obtains the hits of scheduled duration
According to；Wherein, when the output signal is asymmetrical signals in the monocycle, it is corresponding that the scheduled duration is equal to the frequency values
The integral multiple of periodic quantity；When the output signal is symmetric signal in the monocycle, the scheduled duration is equal to the frequency values
The integral multiple of corresponding periodic quantity half；
The processing module 200, is connected for the sampled data according to the scheduled duration and with the Devices to test
The resistance value of load, calculates power output of the output signal under the load.
The device of the present embodiment, can be used for the technical scheme for performing embodiment of the method shown in Fig. 2, its realization principle and skill
Art effect is similar, and here is omitted.
Further, the acquisition module 100, specifically for according to the first sample frequency and the first sampling duration collection institute
Output signal is stated, the first time-domain signal data are obtained；And the first time-domain signal data are subjected to Fourier transformation, obtain institute
State corresponding first frequency-domain signal data of the first time-domain signal data；And according to the ordinate of first frequency-domain signal data
Value, determines the first peak point；And according to the position of first sample frequency, the first sampling duration and first peak point
Confidence ceases, and determines the corresponding frequency values of first peak point, and the corresponding frequency values of first peak point are defined as into institute
The frequency values of output signal are stated, first peak point is the data of ordinate value maximum in first frequency-domain signal data
Point.
The device of the present embodiment, can be used for the technical scheme for performing embodiment of the method shown in Fig. 3, its realization principle and skill
Art effect is similar, and here is omitted.
Further, the acquisition module 100, also particularly useful for the frequency values according to the output signal, determines second
Sampling duration；And according to output signal described in the second sample frequency and the second sampling duration collection, obtain the pre- timing
Long sampled data；Wherein, when the output signal is asymmetrical signals in the monocycle, the second sampling duration is equal to institute
State the integral multiple of the corresponding periodic quantity of frequency values；When the output signal is symmetric signal in the monocycle, second sampling
Duration is equal to the integral multiple of the corresponding periodic quantity half of the frequency values.
Further, the acquisition module 100, also particularly useful for the frequency values according to the output signal, determines first
Intercept duration；And the sampled data that duration is equal to the described first interception duration is chosen in the first time-domain signal data, obtain
To the sampled data of the scheduled duration；Wherein, the first interception duration is less than or equal to the described first sampling duration, and
When the output signal is asymmetrical signals in the monocycle, the first interception duration is equal to the frequency values corresponding cycle
The integral multiple of value；When the output signal is symmetric signal in the monocycle, the first interception duration is equal to the frequency values
The integral multiple of corresponding periodic quantity half.
Figure 12 is the structural representation of the application signal power measuring equipment embodiment one.It refer to Figure 12, the present embodiment
The signal power measuring equipment of offer, including：Analog-digital converter ADC Acquisition Circuits 600 and micro-control unit 700
(Microcontroller Unit, abbreviation MCU), wherein,
The ADC Acquisition Circuits 600, the output signal for gathering Devices to test under the control of the MCU700；
The MCU700, the frequency values for obtaining the output signal；And according to the frequency values of the output signal, obtain
Take the sampled data of scheduled duration；And sampled data according to the scheduled duration and the load that is connected with the Devices to test
Resistance value, calculate the power output of the output signal under the load；Wherein, when the output signal is in the monocycle
During asymmetrical signals, the scheduled duration is equal to the integral multiple of the corresponding periodic quantity of the frequency values；When the output signal is
In monocycle during symmetric signal, the scheduled duration is equal to the integral multiple of the corresponding periodic quantity half of the frequency values.
The equipment of the present embodiment, can be used for the technical scheme for performing embodiment of the method shown in Fig. 2, its realization principle and skill
Art effect is similar, and here is omitted.
Further, the ADC Acquisition Circuits 600, specifically for being adopted according to the first sample frequency and the first sampling duration
Collect the output signal, obtain the first time-domain signal data；
The MCU700, specifically for the first time-domain signal data are carried out into Fourier transformation, obtains described first
Corresponding first frequency-domain signal data of time-domain signal data；And according to the ordinate value of first frequency-domain signal data, it is determined that
First peak point；And believed according to the position of first sample frequency, the first sampling duration and first peak point
Breath, determines the corresponding frequency values of first peak point, and the corresponding frequency values of first peak point is defined as described defeated
Go out the frequency values of signal；Wherein, first peak point is the data of ordinate value maximum in first frequency-domain signal data
Point.
The equipment of the present embodiment, can be used for the technical scheme for performing embodiment of the method shown in Fig. 3, its realization principle and skill
Art effect is similar, and here is omitted.
Further, the MCU700, is additionally operable to the frequency values according to the output signal, determines the second sampling duration；
Wherein, when the output signal is asymmetrical signals in the monocycle, the second sampling duration is equal to the frequency values corresponding week
The integral multiple of time value；When the output signal is symmetric signal in the monocycle, the second sampling duration is equal to the frequency
It is worth the integral multiple of corresponding periodic quantity half；
The ADC Acquisition Circuits 600, are additionally operable under the control of the MCU600 according to the second sample frequency and described
Output signal described in two sampling duration collections, obtains the sampled data of the scheduled duration.
Further, the MCU700, is additionally operable to the frequency values according to the output signal, determines the first interception duration；
And the sampled data that duration is equal to the described first interception duration is chosen in the first time-domain signal data, obtain described predetermined
The sampled data of duration.Wherein, the first interception duration is less than or equal to the described first sampling duration, and when the output
When signal is asymmetrical signals in the monocycle, the first interception duration is equal to the integer of the corresponding periodic quantity of the frequency values
Times；When the output signal is symmetric signal in the monocycle, the first interception duration is equal to the frequency values corresponding week
The integral multiple of time value half.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above-mentioned each method embodiment can lead to
The related hardware of programmed instruction is crossed to complete.Foregoing program can be stored in a computer read/write memory medium.The journey
Sequence upon execution, performs the step of including above-mentioned each method embodiment；And foregoing storage medium includes：ROM, RAM, magnetic disc or
Person's CD etc. is various can be with the medium of store program codes.
Finally it should be noted that：Various embodiments above is only to the technical scheme for illustrating the application, rather than its limitations；To the greatest extent
The application is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from each embodiment technology of the application
The scope of scheme.
Claims (10)
1. a kind of signal power detection method, it is characterised in that including：
Obtain the frequency values of the output signal of Devices to test；
According to the frequency values of the output signal, the sampled data of scheduled duration is obtained；Wherein, when the output signal is single-revolution
In phase during asymmetrical signals, the scheduled duration is equal to the integral multiple of the corresponding periodic quantity of the frequency values；When the output letter
Number for during symmetric signal, the scheduled duration is equal to the integral multiple of the corresponding periodic quantity half of the frequency values in the monocycle；
The resistance value for the load being connected according to the sampled data of the scheduled duration and with the Devices to test, calculates the output
Power output of the signal under the load.
2. according to the method described in claim 1, it is characterised in that the frequency values of the output signal for obtaining Devices to test,
Specifically include：
According to output signal described in the first sample frequency and the first sampling duration collection, the first time-domain signal data are obtained；
The first time-domain signal data are subjected to Fourier transformation, corresponding first frequency of the first time-domain signal data is obtained
Domain signal data；
According to the ordinate value of first frequency-domain signal data, the first peak point is determined；Wherein, first peak point is institute
State the maximum data point of ordinate value in the first frequency-domain signal data；
According to the positional information of first sample frequency, the first sampling duration and first peak point, it is determined that described
The corresponding frequency values of first peak point, and the corresponding frequency values of first peak point are defined as to the frequency of the output signal
Value.
3. method according to claim 2, it is characterised in that the frequency values according to the output signal, obtains pre-
The long sampled data of timing, is specifically included：
According to the frequency values of the output signal, the second sampling duration is determined；Wherein, when the output signal is non-in the monocycle
During symmetric signal, the second sampling duration is equal to the integral multiple of the corresponding periodic quantity of the frequency values；When the output signal
For during symmetric signal, the second sampling duration is equal to the integral multiple of the corresponding periodic quantity half of the frequency values in the monocycle；
According to output signal described in the second sample frequency and the second sampling duration collection, the sampling of the scheduled duration is obtained
Data.
4. method according to claim 2, it is characterised in that the frequency values according to the output signal, obtains pre-
The long sampled data of timing, is specifically included：
According to the frequency values of the output signal, the first interception duration is determined；Wherein, the first interception duration is less than or waited
In the described first sampling duration, and when the output signal is asymmetrical signals in the monocycle, described first interception duration etc.
In the integral multiple of the corresponding periodic quantity of the frequency values；When the output signal is symmetric signal in the monocycle, described first
Intercept the integral multiple that duration is equal to the corresponding periodic quantity half of the frequency values；
The sampled data that duration is equal to the described first interception duration is chosen in the first time-domain signal data, obtains described pre-
The long sampled data of timing.
5. the method according to claim any one of 1-4, it is characterised in that the Devices to test is electric for the loudspeaker of television set
Road plate.
6. method according to claim 2, it is characterised in that the first sampling duration is equal to sampling number divided by described
First sample frequency, wherein, the sampling number is 2 integer power.
7. method according to claim 3, it is characterised in that second sample frequency is more than the load of the output signal
Two times of wave frequency rate.
8. a kind of signal power detection means, it is characterised in that including：Acquisition module and processing module, wherein,
The acquisition module, the frequency values of the output signal for obtaining Devices to test；
The acquisition module, is additionally operable to the frequency values according to the output signal, obtains the sampled data of scheduled duration；Wherein,
When the output signal is asymmetrical signals in the monocycle, the scheduled duration is equal to the corresponding periodic quantity of the frequency values
Integral multiple；When the output signal is symmetric signal in the monocycle, the scheduled duration is equal to the frequency values corresponding week
The integral multiple of time value half；
The processing module, the electricity for the load being connected for the sampled data according to the scheduled duration and with the Devices to test
Resistance, calculates power output of the output signal under the load.
9. a kind of signal power measuring equipment, it is characterised in that including：Analog-digital converter ADC Acquisition Circuits and micro-control unit
MCU, wherein,
The ADC Acquisition Circuits, the output signal for gathering Devices to test under the control of the MCU；
The MCU, the frequency values for obtaining the output signal；And according to the frequency values of the output signal, obtain predetermined
The sampled data of duration；And sampled data and the resistance for the load being connected with the Devices to test according to the scheduled duration
Value, calculates power output of the output signal under the load；Wherein, when the output signal is asymmetric in the monocycle
During signal, the scheduled duration is equal to the integral multiple of the corresponding periodic quantity of the frequency values；When the output signal is the monocycle
During interior symmetric signal, the scheduled duration is equal to the integral multiple of the corresponding periodic quantity half of the frequency values.
10. equipment according to claim 9, it is characterised in that
The ADC Acquisition Circuits, specifically for according to output signal described in the first sample frequency and the first sampling duration collection, obtaining
To the first time-domain signal data；
The MCU, specifically for the first time-domain signal data are carried out into Fourier transformation, obtains first time-domain signal
Corresponding first frequency-domain signal data of data；And according to the ordinate value of first frequency-domain signal data, determine the first peak value
Point；And according to the positional information of first sample frequency, the first sampling duration and first peak point, determine institute
The corresponding frequency values of the first peak point are stated, and the corresponding frequency values of first peak point are defined as to the frequency of the output signal
Rate value；Wherein, first peak point is the data point of ordinate value maximum in first frequency-domain signal data.
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| WO2018218838A1 (en) | 2018-12-06 |
| CN107219393B (en) | 2020-02-11 |
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