CN103336172B - A kind of meter shaft frequency signal detection method and circuit - Google Patents
A kind of meter shaft frequency signal detection method and circuit Download PDFInfo
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- CN103336172B CN103336172B CN201310252955.1A CN201310252955A CN103336172B CN 103336172 B CN103336172 B CN 103336172B CN 201310252955 A CN201310252955 A CN 201310252955A CN 103336172 B CN103336172 B CN 103336172B
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Abstract
This application discloses a kind of meter shaft frequency signal detection method and circuit, comprising: the voltage signal receiving detecting sensor input; Voltage isolation processing is carried out to described voltage signal; Respectively the voltage signal after isolation is carried out to the bandpass filtering of multiple different frequency; All carry out data processing and frequency measurement to the filtering signal after each bandpass filtering treatment, obtain the characteristic information of three frequency signals respectively, described characteristic information comprises: voltage magnitude and frequency values.The method adopts high pass and the combined mode of bandpass filtering, has carried out the process to input voltage signal, and carries out the parallel processing topological structure of three frequency ranges to the voltage signal of input, solves existing axle counting system Problems existing.
Description
Technical field
The application relates to railway equipment detection technique field, particularly relates to a kind of meter shaft frequency signal detection method and circuit.
Background technology
Meter shaft is also known as microcomputer axle-counting, the large installing equipment in station, railway two ends, utilize the closed-loop sensors supervision train wheel being arranged on rail to through number, semiautomatic equipment is utilized to be sent to remote station the wheel logarithm of our station after microsystem and door through being located at indoor detect, train arrives after remote station, automatically opens interval when remote station receives wheel logarithm and tours start here identical.That is, meter shaft is a kind of railway signals equipment that can detect by wheel, because meter shaft does not need attachment rail to insulate, which avoid the sawed-off soldered long rail because inserting insulation, so it can replace many common rail circuit.
In traditional axle counting system, machine comprises 3 kinds of frequency signals to the signal of indoor host computer outdoor: 2500Hz, 4150Hz, 5060Hz.The effect of meter shaft frequency sensor is exactly amplitude and the frequency of measuring these 3 kinds of signals, and has higher requirement to the response time.
The detection method of existing a kind of 50Hz/400Hz voltage sensor scheme, can as shown in Figure 1, in figure, frequency signal enters functional module 2 after isolating respectively through functional module 1 and carries out signal filtering, in functional module 3, complete true rms value convertor, finally exported by bus RS485 again.
But by research to prior art, inventor finds: traditional voltage sensor scheme exists following problem, so that can not supporting application inside axle counting system:
1, can not simultaneously from input mixed signal effectively, extracting and developing 2500Hz, 4150Hz and 5060Hz tri-kinds of frequency signals accurately.
The buffer circuit of 2, traditional voltage sensor is when being applied to 2k-5kHz, and its amplitude versus frequency characte is smooth not, and signal there will be distortion, causes signal measurement to have relatively large deviation.And the frequency range of distortion can affect the measurement of other frequency range, as: the distortion of 2500Hz frequency signal can have influence on the amplitude measurement of 5060Hz frequency range.
3, meter shaft frequency signal there will be change at train wheel through out-of-date, and the time range of change is at 30mS-120mS, and the response time of traditional voltage sensor, at 100mS-300mS, cannot meet actual request for utilization.
Summary of the invention
In view of this, the embodiment of the present application provides a kind of meter shaft frequency signal detection method and circuit, to solve existing axle counting system Problems existing.
To achieve these goals, the technical scheme that provides of the embodiment of the present application is as follows:
A kind of meter shaft frequency signal detection method, comprising:
Receive the voltage signal of detecting sensor input;
Voltage isolation processing is carried out to described voltage signal;
Respectively the voltage signal after isolation is carried out to the bandpass filtering of multiple different frequency;
All carry out data processing and frequency measurement to the filtering signal after each bandpass filtering treatment, obtain the characteristic information of three frequency signals respectively, described characteristic information comprises: voltage magnitude and frequency values.
Preferably, multiple different frequency comprises: 2050Hz, 4150Hz and 5060Hz.
Preferably, described bandpass filtering comprises:
A/D conversion is carried out to the voltage signal after isolation processing, obtains digital voltage signal;
Filter factor and default computing buffered data are loaded to described digital voltage signal, obtains the first signal;
Adopt two 2 rank bandpass filter to carry out bandpass filtering to described first signal successively and obtain secondary signal and the first computing buffered data;
Filter factor and the first computing buffered data are loaded to described secondary signal, obtains the 3rd signal;
Adopt two 2 rank bandpass filter to carry out bandpass filtering to described 3rd signal successively and obtain the 4th signal and the second computing buffered data;
To described 4th signal loading filter factor and the second computing buffered data, obtain the 5th signal;
Adopt two 2 rank bandpass filter to carry out bandpass filtering to described 5th signal successively, obtain filtering signal.
Preferably, described data processing comprises:
Effective value computing is carried out to described filtering signal;
Low-pass filtering treatment is carried out to the signal after described effective value computing;
Signal after described low-pass filtering treatment is corrected, obtains the voltage magnitude of frequency signal.
Preferably, described frequency measurement comprises:
Discrete Fourier transformation is carried out to described filtering signal;
Spectrum Correction is carried out to the signal after described discrete Fourier transformation, obtains the frequency values of frequency signal.
A kind of meter shaft frequency signal detection circuit, comprising:
For receiving the voltage input circuit of the voltage signal of detecting sensor input;
Input end is connected with described voltage input circuit, for carrying out the voltage isolation circuit of voltage isolation processing to described voltage signal;
Input end is connected with the output terminal of described voltage isolation circuit, for carrying out the first bandwidth-limited circuit of different frequency bandpass filtering, the second bandwidth-limited circuit and the 3rd bandwidth-limited circuit to the voltage signal after isolation;
Input end is connected with the output terminal of in described first bandwidth-limited circuit, the second bandwidth-limited circuit, the 3rd bandwidth-limited circuit, obtains three data processing circuits of the voltage magnitude of frequency signal for carrying out data processing to the signal after bandpass filtering;
Input end is connected with the output terminal of in described first bandwidth-limited circuit, the second bandwidth-limited circuit, the 3rd bandwidth-limited circuit, obtains three frequency measurement circuits of the frequency values of frequency signal for carrying out frequency measurement to the filtering signal after bandpass filtering treatment.
Preferably, the frequency of described first bandwidth-limited circuit is 2050Hz, and the frequency of described second bandwidth-limited circuit is 4150Hz, and the frequency of described 3rd bandwidth-limited circuit is 5060Hz.
Preferably, described first bandwidth-limited circuit, the second bandwidth-limited circuit and the 3rd bandwidth-limited circuit comprise respectively:
For carrying out the A/D change-over circuit that A/D is converted to digital voltage signal to the voltage signal after isolation processing;
For obtaining the first loaded circuit of the first signal to described digital voltage signal loading filter factor and computing buffered data;
Be in series, for carrying out to described first signal two 2 rank bandpass filter that bandpass filtering obtains secondary signal and the first computing buffered data successively;
For obtaining the second loaded circuit of the 3rd signal to described secondary signal loading filter factor and the first computing buffered data;
Be in series, for carrying out to described 3rd signal two 2 rank bandpass filter that bandpass filtering obtains the 4th signal and the second computing buffered data successively;
For obtaining the 3rd loaded circuit of the 5th signal to described 4th signal loading filter factor and the second computing buffered data;
Be in series, for carrying out to described 5th signal two 2 rank bandpass filter that bandpass filtering obtains filtering signal successively.
Preferably, described data processing circuit comprises:
For carrying out the first computing circuit of effective value computing to described filtering signal;
For carrying out the low-pass filter circuit of low-pass filtering treatment to the signal after described effective value computing;
For correcting the first correcting circuit of the voltage magnitude obtaining frequency signal to the signal after described low-pass filtering treatment.
Preferably, described frequency measurement circuit comprises:
For carrying out the second computing circuit of discrete Fourier transformation to described filtering signal;
For carrying out the second correcting circuit that Spectrum Correction obtains the frequency values of frequency signal to the signal after described discrete Fourier transformation.
From above technical scheme, high pass and the combined mode of bandpass filtering is adopted in this meter shaft frequency signal detection method that the embodiment of the present application provides and circuit, carry out the process to input voltage signal, and the voltage signal of input is carried out to the parallel processing topological structure of three frequency ranges, compared with prior art, the application has the following advantages:
1, the amplitude-frequency response characteristic of front end buffer circuit is smooth in 2500Hz-5060Hz section, can meet design requirement, and step response characteristic also can meet design requirement;
2, when carrying out the bandpass filtering of 2500Hz, 4150Hz and 5060Hz tri-kinds of frequency signals, empirical tests, all meet design requirement, and step response characteristic also can meet design requirement in passband with gain in stopband.
3, the response time reaches 15mS, can adapt to on-the-spot measurement needs.
4, the width-frequency response limited in frequency domain in whole input should all in the precision of regulation, and the interference between different frequency range is almost nil, mutually can meet on-the-spot measurement.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The schematic flow sheet of a kind of meter shaft frequency signal detection method that Fig. 1 provides for the embodiment of the present application;
The schematic flow sheet of the bandpass filtering that Fig. 2 provides for the embodiment of the present application;
The schematic flow sheet of the data processing that Fig. 3 provides for the embodiment of the present application;
The schematic flow sheet of the frequency measurement that Fig. 4 provides for the embodiment of the present application;
The schematic flow sheet of the another kind of meter shaft frequency signal detection method that Fig. 5 provides for the embodiment of the present application;
The structured flowchart of a kind of meter shaft frequency signal detection circuit that Fig. 6 provides for the embodiment of the present application;
The structural representation of the bandwidth-limited circuit that Fig. 7 provides for the embodiment of the present application;
The structural representation of the data processing circuit that Fig. 8 provides for the embodiment of the present application;
The structural representation of the frequency measurement circuit that Fig. 9 provides for the embodiment of the present application;
The structured flowchart of the another kind of meter shaft frequency signal detection circuit that Figure 10 provides for the embodiment of the present application.
Embodiment
Technical scheme in the application is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
The schematic flow sheet of a kind of meter shaft frequency signal detection method that Fig. 1 provides for the embodiment of the present application
As shown in Figure 1, the method comprises the following steps:
S100: the voltage signal receiving detecting sensor input.
Receive and detect by the detecting sensor being arranged on Test Field the voltage signal obtained, also namely receive the voltage signal that off-premises station sends, the voltage signal received here meets signal, in this voltage signal, includes multiple frequency signal.
S200: voltage isolation processing is carried out to described voltage signal.
Carry out voltage isolation processing to voltage signal, isolation can suppress common mode interference, solving the common ground problem of different system, its objective is in order to avoid preventing signal disturbing, improves accuracy of detection.
S300: the bandpass filtering respectively voltage signal after isolation being carried out to multiple different frequency.
In the embodiment of the present application, 3 kinds of frequency signals are included in the voltage signal received, be respectively: 2500Hz, 4150Hz and 5060Hz, so when carrying out bandpass filtering to the voltage signal after isolation, need to carry out respectively the signal of different frequency respectively, namely need to carry out 2500Hz bandpass filtering, 4150Hz bandpass filtering and 5060Hz bandpass filtering to the voltage signal after isolation simultaneously.
Can by three frequency signal extraction and isolation in the voltage signal that receives out by the bandpass filtering of different frequency, to carry out other subsequent treatment to each frequency signal.
When carrying out bandpass filtering, as shown in Figure 2, in the embodiment of the present application, bandpass filtering can comprise the following steps:
S301: A/D conversion is carried out to the voltage signal after isolation processing, obtains digital voltage signal.
The voltage signal received is generally simulating signal, needs through A/D(modulus) conversion, and then numeric field process is carried out to voltage signal.
S302: filter factor and default computing buffered data are loaded to described digital voltage signal, obtains the first signal.
Adopt and load filter factor and default computing buffered data, wave filter holding time can be reduced, improve arithmetic speed.Because the quantity of wave filter is many, and the operand of often kind of wave filter is all bigger than normal, and the speed resource-constrained of CPU.In this case, reduce wave filter holding time and become extremely important.Because can not there be too large change the computing time used, so can only consider that the time reducing some other links takies, the loading of such as data and storage.Loading and the storage of data have been come by external bus, so reduce CPU to the access of external bus, can save many time.Therefore we adopt batch to load the method for filter coefficient, mass simultaneous memory filter buffered data, can reduce some unnecessary loadings like this and store the speed wasting of resources operating and bring.
S303: adopt two 2 rank bandpass filter to carry out bandpass filtering to described first signal successively and obtain secondary signal and the first computing buffered data.
S304: filter factor and the first computing buffered data are loaded to described secondary signal, obtains the 3rd signal.
S305: adopt two 2 rank bandpass filter to carry out bandpass filtering to described 3rd signal successively and obtain the 4th signal and the second computing buffered data.
S306: to described 4th signal loading filter factor and the second computing buffered data, obtain the 5th signal.
S307: adopt two 2 rank bandpass filter to carry out bandpass filtering to described 5th signal successively, obtain filtering signal.
S400: all data processing and frequency measurement are carried out to the filtering signal after each bandpass filtering treatment.
The fundamental purpose of carrying out data processing is the amplitude size in order to obtain frequency signal, and in the embodiment of the present application, as shown in Figure 3, the process of data processing can comprise:
S401: effective value computing is carried out to described filtering signal.
S402: low-pass filtering treatment is carried out to the signal after described effective value computing.
S403: correct the signal after described low-pass filtering treatment, obtains the voltage magnitude of frequency signal.
The fundamental purpose of carrying out frequency measurement is the frequency values in order to obtain frequency signal, and in the embodiment of the present application, as shown in Figure 4, the process of frequency measurement can comprise:
S404: discrete Fourier transformation is carried out to described filtering signal;
S405: carry out Spectrum Correction to the signal after described discrete Fourier transformation, obtains the frequency values of frequency signal.
In other embodiments of the application, when after the voltage magnitude obtaining three frequency signals by data processing and frequency measurement and frequency values, the voltage magnitude of the frequency signal obtained and frequency values can also be sent.
In addition, in other embodiments of the application, the impact of the data processing that frequency measuring step can also be corresponded, namely after carrying out bandpass filtering, first carry out data processing, after data processing obtains the amplitude of frequency signal, determining whether to carry out frequency measurement.
As shown in Figure 5, the method can also comprise the following steps after step S403:
S500: judge whether the described voltage magnitude to obtaining after a data processing is less than predetermined threshold value.
The object of above-mentioned judgement is to differentiate that whether input signal is too little, this is because in the too little situation of input voltage signal, without the need to carrying out frequency measurement.
In this step, when judged result be voltage magnitude be less than predetermined threshold value time, carry out step S
600: stop the frequency measurement corresponding with described data processing, and described voltage magnitude is exported.
From above technical scheme, this meter shaft frequency signal detection method that the embodiment of the present application provides, middle employing high pass and the combined mode of bandpass filtering, carry out the process to input voltage signal, and the voltage signal of input is carried out to the parallel processing topological structure of three frequency ranges, compared with prior art, the method has the following advantages:
1, the amplitude-frequency response characteristic of front end buffer circuit is smooth in 2500Hz-5060Hz section, can meet design requirement, and step response characteristic also can meet design requirement;
2, when carrying out the bandpass filtering of 2500Hz, 4150Hz and 5060Hz tri-kinds of frequency signals, empirical tests, all meet design requirement, and step response characteristic also can meet design requirement in passband with gain in stopband.
3, the response time reaches 15mS, can adapt to on-the-spot measurement needs.
4, the width-frequency response limited in frequency domain in whole input should all in the precision of regulation, and the interference between different frequency range is almost nil, mutually can meet on-the-spot measurement.
Embodiment two:
The structured flowchart of a kind of meter shaft frequency signal detection circuit that Fig. 6 provides for the embodiment of the present application.
As shown in Figure 6, this meter shaft frequency signal detection circuit comprises: voltage input circuit 10, voltage isolation circuit 20, first bandwidth-limited circuit 31, second bandwidth-limited circuit 32, the 3rd bandwidth-limited circuit 33, three data processing circuits 40 and three frequency measurement circuits 50.
Voltage input circuit 10 is connected with the detecting sensor being arranged on Test Field, for receiving the voltage signal of detecting sensor input, also namely receive the voltage signal that off-premises station sends, the voltage signal received here meets signal, in this voltage signal, include multiple frequency signal.
The input end of voltage isolation circuit 20 is connected with voltage input circuit 10, for carrying out voltage isolation processing to described voltage signal.
Carry out voltage isolation processing to voltage signal, isolation can suppress common mode interference, solving the common ground problem of different system, its objective is in order to avoid preventing signal disturbing, improves accuracy of detection.In addition, in this application, the amplitude-frequency response characteristic of voltage isolation circuit 20 is in 2500Hz-5060Hz section.
First bandwidth-limited circuit 31, second bandwidth-limited circuit 32 is all connected with the output terminal of voltage isolation circuit 20 with the input end of the 3rd bandwidth-limited circuit 33, for carrying out different frequency bandpass filtering to the voltage signal after isolation.
In the embodiment of the present application, 3 kinds of frequency signals are included in the voltage signal received, be respectively: 2500Hz, 4150Hz and 5060Hz, so when carrying out bandpass filtering to the voltage signal after isolation, need to carry out respectively the signal of different frequency respectively, the frequency of the first bandwidth-limited circuit 31 is 2500Hz, and the frequency of the second bandwidth-limited circuit 32 is 4150Hz, and the frequency of the 3rd bandwidth-limited circuit 33 is 5060Hz.
Can by three frequency signal extraction and isolation in the voltage signal that receives out by the bandpass filtering of different frequency, to carry out other subsequent treatment to each frequency signal.
In the embodiment of the present application, as shown in Figure 7, each bandwidth-limited circuit comprises respectively: A/D change-over circuit 101, first loaded circuit 102, second loaded circuit 103, the 3rd loaded circuit 104 and 62 rank bandpass filter 105, wherein,
A/D change-over circuit 101 is converted to digital voltage signal for carrying out A/D to the voltage signal after isolation processing;
First loaded circuit 102 is for obtaining the first signal to described digital voltage signal loading filter factor and computing buffered data;
Being in series with two 2 rank bandpass filter 105 at the output terminal of the first loaded circuit 102, obtaining secondary signal and the first computing buffered data for carrying out bandpass filtering to described first signal successively;
Second loaded circuit 103 is for obtaining the 3rd signal to described secondary signal loading filter factor and the first computing buffered data;
Being in series with two 2 rank bandpass filter 105 at the output terminal of the second loaded circuit 103, obtaining the 4th signal and the second computing buffered data for carrying out bandpass filtering to described 3rd signal successively;
3rd loaded circuit 104 is for obtaining the 5th signal to described 4th signal loading filter factor and the second computing buffered data;
Being in series with two 2 rank bandpass filter 105 at the output terminal of the 3rd loaded circuit 104, obtaining filtering signal for carrying out bandpass filtering to described 5th signal successively.
In addition, in the embodiment of the present application, after obtaining the first computing buffered data or the second computing buffered data, conveniently subsequent applications, as shown in Figure 7, adopts storer 106 first computing buffered data or the second computing buffered data to be stored.
In addition, in other embodiments of the application, the first loaded circuit 102, second loaded circuit 103, the 3rd loaded circuit 104 can also be a loaded circuit, just realize difference in functionality at different time.
The input end of three data processing circuits 40 is connected, for carrying out to the signal after bandpass filtering the voltage magnitude that data processing obtains frequency signal with the output terminal of in described first bandwidth-limited circuit, the second bandwidth-limited circuit, the 3rd bandwidth-limited circuit.
In the embodiment of the present application, as shown in Figure 8, data processing circuit 40 comprises: the first computing circuit 401, low-pass filter circuit 402 and the first correcting circuit 403, wherein,
First computing circuit 401 is for carrying out effective value computing to described filtering signal;
Low-pass filter circuit 402 is for carrying out low-pass filtering treatment to the signal after described effective value computing;
First correcting circuit 403 is for correcting the voltage magnitude obtaining frequency signal to the signal after described low-pass filtering treatment.
Three frequency measurement circuit 50 input ends are connected, for carrying out to the filtering signal after bandpass filtering treatment the frequency values that frequency measurement obtains frequency signal with the output terminal of in described first bandwidth-limited circuit, the second bandwidth-limited circuit, the 3rd bandwidth-limited circuit.
In the embodiment of the present application, as shown in Figure 9, frequency measurement circuit 50 comprises: the second computing circuit 501 and the second correcting circuit 502, wherein,
Second computing circuit 501 is for carrying out discrete Fourier transformation to described filtering signal;
Second correcting circuit 502 is for carrying out to the signal after described discrete Fourier transformation the frequency values that Spectrum Correction obtains frequency signal.
In the embodiment of the present application, conveniently export, as shown in Figure 1, this meter shaft frequency signal detection circuit can also comprise: output circuit 60, for the voltage magnitude of obtain three frequency signals and frequency values being exported.
In addition, in other embodiments of the application, the impact of the data processing that frequency measuring step can also be corresponded, namely after carrying out bandpass filtering, first carry out data processing, after data processing obtains the amplitude of frequency signal, determining whether to carry out frequency measurement.
As shown in Figure 10, this meter shaft frequency signal detection circuit can also comprise: comparer 70.
The input end of comparer 70 is connected with data processing circuit 40, and output terminal is connected with frequency measurement circuit 50, and the effect of comparer 70 is compared the described voltage magnitude obtained after a described data processing circuit and predetermined threshold value.
When described voltage magnitude is less than predetermined threshold value, the frequency measurement circuit 50 corresponding with described data processing circuit stops carrying out frequency measurement, and described voltage magnitude exports by described output circuit 60.
From above technical scheme, this meter shaft frequency signal detection method that the embodiment of the present application provides, middle employing high pass and the combined mode of bandpass filtering, carry out the process to input voltage signal, and the voltage signal of input is carried out to the parallel processing topological structure of three frequency ranges, compared with prior art, the method has the following advantages:
1, the amplitude-frequency response characteristic of front end buffer circuit is smooth in 2500Hz-5060Hz section, can meet design requirement, and step response characteristic also can meet design requirement;
2, when carrying out the bandpass filtering of 2500Hz, 4150Hz and 5060Hz tri-kinds of frequency signals, empirical tests, all meet design requirement, and step response characteristic also can meet design requirement in passband with gain in stopband.
3, the response time reaches 15mS, can adapt to on-the-spot measurement needs.
4, the width-frequency response limited in frequency domain in whole input should all in the precision of regulation, and the interference between different frequency range is almost nil, mutually can meet on-the-spot measurement.
For convenience of description, various unit is divided into describe respectively with function when describing above device.Certainly, the function of each unit can be realized in same or multiple software and/or hardware when implementing the application.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the mode that the application can add required general hardware platform by software and realizes.Based on such understanding, the technical scheme of the application can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the application or embodiment.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for device embodiment, because it is substantially similar to embodiment of the method, so describe fairly simple, relevant part illustrates see the part of embodiment of the method.Device embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
The application can be used in numerous general or special purpose computing system environment or configuration.Such as: personal computer, server computer, handheld device or portable set, laptop device, multicomputer system, system, set top box, programmable consumer-elcetronics devices, network PC, small-size computer, mainframe computer, the distributed computing environment comprising above any system or equipment etc. based on microprocessor.
The application can describe in the general context of computer executable instructions, such as program module.Usually, program module comprises the routine, program, object, assembly, data structure etc. that perform particular task or realize particular abstract data type.Also can put into practice the application in a distributed computing environment, in these distributed computing environment, be executed the task by the remote processing devices be connected by communication network.In a distributed computing environment, program module can be arranged in the local and remote computer-readable storage medium comprising memory device.
The above is only the preferred implementation of the application, those skilled in the art is understood or realizes the application.To be apparent to one skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the application, can realize in other embodiments.Therefore, the application can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. a meter shaft frequency signal detection method, is characterized in that, comprising:
Receive the voltage signal of detecting sensor input;
Voltage isolation processing is carried out to described voltage signal;
Respectively the voltage signal after isolation is carried out to the bandpass filtering of multiple different frequency;
All carry out data processing and frequency measurement to the filtering signal after each bandpass filtering treatment, obtain the characteristic information of three frequency signals respectively, described characteristic information comprises: voltage magnitude and frequency values;
Wherein, described bandpass filtering comprises:
A/D conversion is carried out to the voltage signal after isolation processing, obtains digital voltage signal;
Filter factor and default computing buffered data are loaded to described digital voltage signal, obtains the first signal;
Adopt two 2 rank bandpass filter to carry out bandpass filtering to described first signal successively and obtain secondary signal and the first computing buffered data;
Filter factor and the first computing buffered data are loaded to described secondary signal, obtains the 3rd signal;
Adopt two 2 rank bandpass filter to carry out bandpass filtering to described 3rd signal successively and obtain the 4th signal and the second computing buffered data;
To described 4th signal loading filter factor and the second computing buffered data, obtain the 5th signal;
Adopt two 2 rank bandpass filter to carry out bandpass filtering to described 5th signal successively, obtain filtering signal.
2. method according to claim 1, is characterized in that, multiple different frequency comprises: 2050Hz, 4150Hz and 5060Hz.
3. method according to claim 2, is characterized in that, described data processing comprises:
Effective value computing is carried out to described filtering signal;
Low-pass filtering treatment is carried out to the signal after described effective value computing;
Signal after described low-pass filtering treatment is corrected, obtains the voltage magnitude of frequency signal.
4. method according to claim 3, is characterized in that, described frequency measurement comprises:
Discrete Fourier transformation is carried out to described filtering signal;
Spectrum Correction is carried out to the signal after described discrete Fourier transformation, obtains the frequency values of frequency signal.
5. a meter shaft frequency signal detection circuit, is characterized in that, comprising:
For receiving the voltage input circuit of the voltage signal of detecting sensor input;
Input end is connected with described voltage input circuit, for carrying out the voltage isolation circuit of voltage isolation processing to described voltage signal;
Input end is connected with the output terminal of described voltage isolation circuit, for carrying out the first bandwidth-limited circuit of different frequency bandpass filtering, the second bandwidth-limited circuit and the 3rd bandwidth-limited circuit to the voltage signal after isolation;
Input end is connected with the output terminal of in described first bandwidth-limited circuit, the second bandwidth-limited circuit, the 3rd bandwidth-limited circuit, obtains three data processing circuits of the voltage magnitude of frequency signal for carrying out data processing to the signal after bandpass filtering;
Input end is connected with the output terminal of in described first bandwidth-limited circuit, the second bandwidth-limited circuit, the 3rd bandwidth-limited circuit, obtains three frequency measurement circuits of the frequency values of frequency signal for carrying out frequency measurement to the filtering signal after bandpass filtering treatment;
Wherein, described first bandwidth-limited circuit, the second bandwidth-limited circuit and the 3rd bandwidth-limited circuit comprise respectively:
For carrying out the A/D change-over circuit that A/D is converted to digital voltage signal to the voltage signal after isolation processing;
For obtaining the first loaded circuit of the first signal to described digital voltage signal loading filter factor and computing buffered data;
Be in series, for carrying out to described first signal two 2 rank bandpass filter that bandpass filtering obtains secondary signal and the first computing buffered data successively;
For obtaining the second loaded circuit of the 3rd signal to described secondary signal loading filter factor and the first computing buffered data;
Be in series, for carrying out to described 3rd signal two 2 rank bandpass filter that bandpass filtering obtains the 4th signal and the second computing buffered data successively;
For obtaining the 3rd loaded circuit of the 5th signal to described 4th signal loading filter factor and the second computing buffered data;
Be in series, for carrying out to described 5th signal two 2 rank bandpass filter that bandpass filtering obtains filtering signal successively.
6. circuit according to claim 5, is characterized in that, the frequency of described first bandwidth-limited circuit is 2050Hz, and the frequency of described second bandwidth-limited circuit is 4150Hz, and the frequency of described 3rd bandwidth-limited circuit is 5060Hz.
7. circuit according to claim 6, is characterized in that, described data processing circuit comprises:
For carrying out the first computing circuit of effective value computing to described filtering signal;
For carrying out the low-pass filter circuit of low-pass filtering treatment to the signal after described effective value computing;
For correcting the first correcting circuit of the voltage magnitude obtaining frequency signal to the signal after described low-pass filtering treatment.
8. circuit according to claim 7, is characterized in that, described frequency measurement circuit comprises:
For carrying out the second computing circuit of discrete Fourier transformation to described filtering signal;
For carrying out the second correcting circuit that Spectrum Correction obtains the frequency values of frequency signal to the signal after described discrete Fourier transformation.
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