CN109298238A - A kind of frequency measurement method and its measuring system - Google Patents
A kind of frequency measurement method and its measuring system Download PDFInfo
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- CN109298238A CN109298238A CN201811307936.3A CN201811307936A CN109298238A CN 109298238 A CN109298238 A CN 109298238A CN 201811307936 A CN201811307936 A CN 201811307936A CN 109298238 A CN109298238 A CN 109298238A
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- frequency
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- clock signal
- count value
- test signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
- G01R23/10—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into a train of pulses, which are then counted, i.e. converting the signal into a square wave
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- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
The present invention relates to a kind of frequency measurement method and its measuring system, the frequency measurement method includes: to obtain N number of clock signal, while sampling to test signal, wherein the frequency of N number of clock signal is identical, phase is different；The test signal and N number of clock signal obtained according to sampling obtains N number of count value；The frequency of the test signal is obtained according to the frequency of N number of clock signal and N number of count value.Frequency measurement method of the invention is identical by using a set of frequencies, phase different clocks are carried out while being sampled to signal-under-test, to reduce the sampling time, and improves sampling precision, increases the measurement accuracy of frequency.
Description
Technical field
The present invention relates to technical field of frequency measurement, more particularly to a kind of frequency measurement method and its measuring system.
Background technique
With the development of electronics and information industry, signal is as its most basic element, and the measurement of frequency is in Technological research
It becomes more and more important with the effect in practical application.Digital frequency meter is as a kind of most basic frequency measuring instrument, with its measurement essence
The features such as degree is high, speed fast, easy to operate, digital display is widely used.Many physical quantitys (such as temperature, pressure, flow,
Liquid level, pH value, vibration, displacement, speed etc.) signal frequency can be converted by sensor, it is measured with digital frequency meter.Especially
It is combined digital frequency meter with microprocessor, it can be achieved that the multifunction of measuring instrument, programme-controlled and intelligent.With existing
The development of generation science and technology, various measuring instruments, control equipment based on digital frequency meter composition, real-time monitoring system have application to
The various aspects of the international people's livelihood.
Electronic counting method is high with measurement frequency, reading is intuitive, measuring speed is fast and it is automatic to be easy to implement measurement process
The advantages that change.There are two types of modes for the frequency measurement of electronic counting method: first is that direct frequency measurement method, i.e., measure tested letter within certain gate time
Number pulse number；Second is that indirect Measuring Frequency Method, such as period method.Counter digital frequency meter is as one in digital frequency meter
Kind, can directly in digit's time test signal umber of pulse, then display frequency value in digital form.This method measurement
Accuracy is high, quick, is suitble to the needs of different frequency, different precision frequency measurement.
But existing measurement method and measuring system usually sample test signal using single clock, if
Improving measuring accuracy then needs to increase the frequency of sampling clock or increases the time of sampling, and the increase of sample frequency will lead into
This increase, the increase in sampling time will lead to test reaction and slow.
Summary of the invention
Therefore, be to solve technological deficiency of the existing technology and deficiency, the present invention propose a kind of frequency measurement method and
Its measuring system.
Specifically, a kind of frequency measurement method that one embodiment of the invention proposes, the frequency measurement method include:
N number of clock signal is obtained, while test signal is sampled, wherein the frequency phase of N number of clock signal
Same, phase difference；
The test signal and N number of clock signal obtained according to sampling obtains N number of count value；
The frequency of the test signal is obtained according to the frequency of N number of clock signal and N number of count value.
In one embodiment of the invention, the test signal and N number of clock signal obtained according to sampling obtains
Take N number of count value, comprising:
The period of the test signal obtained according to sampling generates enable signal；
N number of count value is obtained according to the enable signal and N number of clock signal.
In one embodiment of the invention, institute is obtained according to the frequency of N number of clock signal and N number of count value
State the frequency of test signal, comprising:
Summation process is carried out to N number of count value, to obtain counting summation position；
Frequency computation model is established according to the frequency of N number of clock signal and the counting summation position；
The frequency of the test signal is obtained according to the frequency computation model.
In one embodiment of the invention, the frequency computation model are as follows:
Wherein, f is the frequency of the test signal, and fclk is the frequency of the clock signal, and S is the counting summation
Position.
One embodiment of the invention also proposes that a kind of frequency measuring system, the frequency measuring system include:
Sampling clock module samples, wherein N number of described for obtaining N number of clock signal, while to test signal
The frequency of clock signal is identical, phase is different；
Data generating module, by obtained according to the obtained test signal of sampling and N number of clock signal it is N number of based on
Numerical value；
Data processing module, for obtaining the test according to the frequency and N number of count value of N number of clock signal
The frequency of signal.
In one embodiment of the invention, the sampling clock module includes N number of sequentially connected phase inverter.
In one embodiment of the invention, the data generating module includes:
The period of gate circuit, the test signal for being obtained according to sampling generates enable signal；
Count value generation module, for obtaining N number of count value according to the enable signal and N number of clock signal.
In one embodiment of the invention, the count value generation module includes N number of counter.
The embodiment of the present invention, have it is following the utility model has the advantages that
Frequency measurement method of the invention is identical by using a set of frequencies, phase different clocks carry out signal-under-test
It samples simultaneously, to reduce the sampling time, and improves sampling precision, increase the measurement accuracy of frequency.
The present invention generates multiple clocks using sampling clock module, then samples to test signal, improves sampling
Precision, and reduce the sampling time, improves test reaction speed, and the corresponding counter of each clock in a cycle or
It is counted in multiple periods using counter, so that the frequency measurement accuracy of test signal improves.
Through the following detailed description with reference to the accompanying drawings, other aspects of the invention and feature become obvious.But it should know
Road, which is only the purpose design explained, not as the restriction of the scope of the present invention, this is because it should refer to
Appended claims.It should also be noted that unless otherwise noted, it is not necessary to which scale attached drawing, they only try hard to concept
Ground illustrates structure and process described herein.
Detailed description of the invention
Below in conjunction with attached drawing, specific embodiments of the present invention will be described in detail.
Fig. 1 is a kind of flow diagram of frequency measurement method provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of frequency measuring system provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of sampling clock module provided in an embodiment of the present invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
Referring to Figure 1, the embodiment of the present invention provides a kind of frequency measurement method, which includes:
Step 1: obtaining N number of clock signal, while test signal is sampled；
Specifically, N number of clock signal is generated by sampling clock module, while according to N number of clock signal to test signal
It is sampled, wherein the frequency of N number of clock signal is identical, phase is different.
For example, test signal can be temperature, pressure, flow, liquid level, pH value, vibration, displacement, speed etc..
Step 2: the test signal and N number of clock signal that are obtained according to sampling obtain N number of count value；
Specifically, the period of the test signal obtained according to sampling generates enable signal；
Further, the test signal sampled passes through gate circuit, generates enable signal according to the period of test signal,
The enable signal that gate circuit generates can be 1 period or multiple periods of test signal.
Specifically, N number of count value is obtained according to enable signal and N number of clock signal；
Further, under conditions of N number of clock signal, N number of counter starts counting under the control of enable signal, often
A counter correspondence obtains a count value, amounts to and obtains N number of count value.
Step 3: obtaining the frequency of test signal according to the frequency of N number of clock signal and N number of count value；
Specifically, summation process is carried out to N number of count value, the result summed is to count summation position.
Specifically, frequency computation model, frequency computation model are established according to the frequency of N number of clock signal and counting summation position
Are as follows:
Wherein, f is the frequency for testing signal, and fclk is the frequency of clock signal, and S is to count summation position.
Specifically, the frequency of test signal is obtained according to frequency computation model.
In practical applications, it carries out if only using 1 clock to test signals samples, sampling error if is 1 clock
It is generated in period, then time error is 1/fclk, and the embodiment of the present invention adopts test signal using N number of clock
Sample, then each sampling error was generated in 1 clock cycle, then total sampling error is then surveyed for (1/fclk)/N
The frequency test precision response of trial signal will improve N times.
Frequency measurement method of the invention is identical by using a set of frequencies, phase different clocks carry out signal-under-test
It samples simultaneously, and seeks the frequency of test signal using count value identical with clock number, not only reduce the sampling time, also
Sampling precision is improved, the measurement accuracy of frequency is increased.
The present invention samples test signal using multiple clocks, improves sampling precision, and reduce the sampling time,
Test reaction speed, and the corresponding count value of each clock signal are improved, so that the frequency measurement accuracy of test signal mentions
It is high.
Fig. 2 is referred to, the embodiment of the present invention also provides a kind of frequency measuring system, which includes:
Sampling clock module samples, wherein N number of described for obtaining N number of clock signal, while to test signal
The frequency of clock signal is identical, phase is different；
Specifically, N number of clock signal is generated by sampling clock module, while according to N number of clock signal samples clock mould
Block samples test signal；
Further, Fig. 3 is referred to, sampling clock module is made of N number of sequentially connected phase inverter.
Data generating module, by obtained according to the obtained test signal of sampling and N number of clock signal it is N number of based on
Numerical value；
Further, data generating module includes gate circuit and count value generation module；
Specifically, the period of gate circuit, the test signal for being obtained according to sampling generates enable signal；
Further, the test signal sampled passes through gate circuit, and gate circuit is generated according to the period of test signal
Enable signal, the enable signal that gate circuit generates can be 1 period or multiple periods of test signal.
Specifically, count value generation module, based on N number of according to the enable signal and N number of clock signal acquisition
Numerical value.
Further, count value generation module includes N number of counter.Under conditions of N number of clock signal, N number of meter
Number device starts counting under the control of enable signal, and each counter correspondence obtains a count value, amounts to and obtains N number of counting
Value.
Data processing module, for obtaining the test according to the frequency and N number of count value of N number of clock signal
The frequency of signal.
Specifically, data processing module carries out summation process to N number of count value, and the result summed is to count summation
Position.
Specifically, data processing module obtains the frequency of the test signal according to frequency computation model, and frequency calculates mould
Type are as follows:
Wherein, f is the frequency for testing signal, and fclk is the frequency of clock signal, and S is to count summation position.
The embodiment of the present invention generates multiple clocks using sampling clock module, then samples, mentions to test signal
High sampling precision, and the sampling time is reduced, test reaction speed is improved, and the corresponding counter of each clock is one
It is counted in a period or multiple periods using counter, so that the frequency measurement accuracy of test signal improves.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (8)
1. a kind of frequency measurement method, which is characterized in that the frequency measurement method includes:
It obtains N number of clock signal, while test signal is sampled, wherein the frequency of N number of clock signal is identical, phase
Position is different；
The test signal and N number of clock signal obtained according to sampling obtains N number of count value；
The frequency of the test signal is obtained according to the frequency of N number of clock signal and N number of count value.
2. frequency measurement method according to claim 1, which is characterized in that according to the obtained test signal of sampling and
N number of clock signal obtains N number of count value, comprising:
The period of the test signal obtained according to sampling generates enable signal；
N number of count value is obtained according to the enable signal and N number of clock signal.
3. frequency measurement method according to claim 1, which is characterized in that according to the frequency and N of N number of clock signal
A count value obtains the frequency of the test signal, comprising:
Summation process is carried out to N number of count value, to obtain counting summation position；
Frequency computation model is established according to the frequency of N number of clock signal and the counting summation position；
The frequency of the test signal is obtained according to the frequency computation model.
4. frequency measurement method according to claim 3, which is characterized in that the frequency computation model are as follows:
Wherein, f is the frequency of the test signal, and fclk is the frequency of the clock signal, and S is the counting summation position.
5. a kind of frequency measuring system, which is characterized in that the frequency measuring system includes:
Sampling clock module samples, wherein N number of clock for obtaining N number of clock signal, while to test signal
The frequency of signal is identical, phase is different；
Data generating module, the test signal and N number of clock signal for being obtained according to sampling obtain N number of counting
Value；
Data processing module, for obtaining the test signal according to the frequency and N number of count value of N number of clock signal
Frequency.
6. frequency measuring system according to claim 5, which is characterized in that the sampling clock module include it is N number of successively
The phase inverter of connection.
7. frequency measuring system according to claim 5, which is characterized in that the data generating module includes:
The period of gate circuit, the test signal for being obtained according to sampling generates enable signal；
Count value generation module, for obtaining N number of count value according to the enable signal and N number of clock signal.
8. frequency measuring system according to claim 7, which is characterized in that the count value generation module includes N number of meter
Number device.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111352010A (en) * | 2020-04-23 | 2020-06-30 | 刘文辉 | Switch board insulation fault early warning device |
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| JPH0448271A (en) * | 1990-06-15 | 1992-02-18 | Yokogawa Electric Corp | Measuring device for frequency change |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111352010A (en) * | 2020-04-23 | 2020-06-30 | 刘文辉 | Switch board insulation fault early warning device |
| CN111352010B (en) * | 2020-04-23 | 2022-06-14 | 烟台海珐电气科技有限公司 | Switch board insulation fault early warning device |
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Application publication date: 20190201 |