CN104849549B - Measure the method and system of pulse frequency - Google Patents
Measure the method and system of pulse frequency Download PDFInfo
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- CN104849549B CN104849549B CN201510191123.2A CN201510191123A CN104849549B CN 104849549 B CN104849549 B CN 104849549B CN 201510191123 A CN201510191123 A CN 201510191123A CN 104849549 B CN104849549 B CN 104849549B
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Abstract
A kind of method for measuring pulse frequency, is counted to pulse signal to be measured, to obtain the counted number of pulses K of sampling interval duration pulse signal to be measured between T two trigger signals in time sampling signal；Standard frequency pulse signal is counted, the time T1 between first pulse of the previous trigger signal of time sampling signal and pulse signal to be measured between the two neighboring trigger signal is obtained, and obtains the time T2 between last pulse of trigger signal and pulse signal to be measured between the two neighboring trigger signal described in time sampling signal the latter；Then the frequency f=K/ (T+T1 T2) of pulse signal to be measured is obtained.Calculated by the way that T1 and T2 is introduced, can solve half of pulse problem of head and the tail, substantially reduce or even eliminate measurement error so that measurement is more accurate.The present invention also provides a kind of system for measuring pulse frequency.
Description
Technical field
The present invention relates to electronic surveying field, more particularly to a kind of method and system for measuring pulse frequency.
Background technology
Measurement for pulse frequency, generally there are two kinds of measuring methods：M methods and T methods.
T methods are to measure time conversion between two pulses into the cycle so as to obtain frequency (frequency=1/ cycle), because depositing
In half of chronomere's problem of head and the tail, the error of a chronomere might have.When frequency is higher, cycle for measuring compared with
Small, the ratio shared by error becomes big, so T methods preferably measure low-frequency pulse.However, when half because of head and the tail both be present in the measurement of T methods
Between error caused by unit problem, problems with again be present：When pulse frequency is relatively low, the time interval between two neighboring pulse
(i.e. cycle) will be very big, spillover occurs when may result in rolling counters forward, cause measurement result mistake.
M methods generally preferably measure high-frequency impulse.M methods are that the umber of pulse in cooling water of units of measurement time is converted into frequency (frequency=arteries and veins
Rush number/unit interval), because half of pulse problem of head and the tail in time of measuring be present, it might have the error of two pulses.Example
Such as, pulse frequency is fixed, sampling interval duration is fixed, and number of pulses is respectively N1, N2 in the two neighboring unit interval；N1 and N2
3 kinds of relations are there may be, i.e.,：N1=N2, N1=N2+1, N1=N2-1.When pulse frequency is fixed, sampling interval duration is fixed,
The frequency result of calculation in the two neighboring sampling interval obtained according to M method calculation formula may be inconsistent, this result of calculation
Inconsistent performance and unobvious when sampling interval duration is longer, but the M methods calculation formula when sampling interval duration is shorter
Result of calculation fluctuation is obvious to be increased.And sampling interval duration can not possibly be oversize in actually measuring, because during the longer sampling interval
Between can not reflect the change of pulse frequency and the hysteresis for causing to detect and controlling in time.Thus, traditional M method measuring accuracies
It need to be improved.
The content of the invention
Based on this, it is necessary to provide a kind of measurement pulse frequency that accuracy of measurement can be improved when measuring higher pulse frequencies
The method of rate, further, it would be desirable to provide a kind of system for measuring pulse frequency.
A kind of method for measuring pulse frequency, including：
Receive pulse signal, standard frequency pulse signal and time sampling signal to be measured, the frequency of standard frequency pulse signal
Rate is f1；
Pulse signal to be measured is counted, to obtain two triggerings of sampling interval duration in time sampling signal as T
The counted number of pulses K of pulse signal to be measured between signal；
Standard frequency pulse signal is counted, obtains the previous trigger signal of time sampling signal and arteries and veins to be measured
The time T1 rushed between first pulse of the signal between two trigger signals, and obtain time sampling signal the latter
Time between last pulse of the trigger signal and pulse signal to be measured between the two neighboring trigger signal
T2；
The frequency f=K/ (T+T1-T2) of pulse signal to be measured is obtained, wherein：T is preset value, and T is time sampling signal
Sampling interval duration.
In one of the embodiments, the step of being counted to standard frequency pulse signal, obtaining T1 and T2 includes：
Standard frequency pulse signal is counted, when receiving a pulse of pulse signal to be measured, standard frequency arteries and veins
Reset after rushing the counted number of pulses latch of signal；When receiving the previous trigger signal of time sampling signal, arteries and veins to be measured
Being reset after rushing the counted number of pulses latch of signal, the counted number of pulses of standard frequency pulse signal is latching to ClockCntBack1,
Obtain T1=ClockCntBack1/f1；When receiving trigger signal described in the latter of time sampling signal, pulse letter to be measured
Number counted number of pulses be latching to K after reset, the counted number of pulses of standard frequency pulse signal is latching to ClockCntBack2,
Obtain T2=ClockCntBack2/f1.
In one of the embodiments, in time sampling signal sampling interval duration be T two trigger signals it
Between also clip N-1 trigger signal.
In one of the embodiments, N=1.
In one of the embodiments, the detection rising edge of pulse signal is effective.
A kind of system for measuring pulse frequency, including：
Receiving module, for receiving pulse signal, standard frequency pulse signal and time sampling signal to be measured, standard frequency
The frequency of pulse signal is f1；
First counting module, for being counted to pulse signal to be measured, to obtain the sampling interval in time sampling signal
The counted number of pulses K of pulse signal to be measured between two trigger signals that time is T；
Second counting module, for being counted to standard frequency pulse signal, obtain the previous institute of time sampling signal
The time T1 between first pulse of trigger signal and pulse signal to be measured between two trigger signals is stated, and is obtained
Trigger signal described in time sampling signal the latter and pulse signal to be measured are last between the two neighboring trigger signal
Time T2 between one pulse；
Frequency computing module, for obtaining the frequency f=K/ (T+T1-T2) of pulse signal to be measured, wherein：T is preset value,
T is the sampling interval duration of time sampling signal.
In one of the embodiments, second counting module is used for：
Standard frequency pulse signal is counted, when receiving a pulse of pulse signal to be measured, standard frequency arteries and veins
Reset after rushing the counted number of pulses latch of signal；When receiving the previous trigger signal of time sampling signal, arteries and veins to be measured
Being reset after rushing the counted number of pulses latch of signal, the counted number of pulses of standard frequency pulse signal is latching to ClockCntBack1,
Obtain T1=ClockCntBack1/f1；When receiving trigger signal described in the latter of time sampling signal, pulse letter to be measured
Number counted number of pulses be latching to K after reset, the counted number of pulses of standard frequency pulse signal is latching to ClockCntBack2,
Obtain T2=ClockCntBack2/f1.
In one of the embodiments, in time sampling signal sampling interval duration be T two trigger signals it
Between also clip N-1 trigger signal.
In one of the embodiments, N=1.
In one of the embodiments, the detection rising edge of pulse signal is effective.
The method and system of above-mentioned measurement pulse frequency, are counted to pulse signal to be measured, to obtain time sampling letter
The counted number of pulses K of pulse signal to be measured between two trigger signals that sampling interval duration is T in number；To standard frequency pulse
Signal is counted, and obtains the previous trigger signal of time sampling signal with pulse signal to be measured two neighboring described tactile
The time T1 between first pulse between signalling, and obtain trigger signal described in time sampling signal the latter with it is to be measured
Time T2 between last pulse of pulse signal between the two neighboring trigger signal；Then pulse to be measured is obtained
The frequency f=K/ (T+T1-T2) of signal.Calculated by the way that T1 and T2 is introduced, can solve half of pulse problem of head and the tail, significantly
Reduce and even eliminate measurement error so that measurement is more accurate.
Brief description of the drawings
Fig. 1 is each step schematic diagram of method of measurement pulse frequency；
Fig. 2 is signal timing diagram；
Fig. 3 is the measurement time chart that sampling interval duration is separated into N deciles；
Fig. 4 is the simple block diagram of the system of measurement pulse frequency.
Embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give presently preferred embodiments of the present invention.But the present invention can realize in many different forms, however it is not limited to this paper institutes
The embodiment of description.On the contrary, the purpose for providing these embodiments is to make the understanding to the disclosure more thorough
Comprehensively.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Term used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that the limitation present invention.Term as used herein "and/or" includes one or more related
Listed Items arbitrary and all combination.
Fig. 1 is each step schematic diagram of method of measurement pulse frequency.Although it should be understood that in Fig. 1 flow chart
Each step is shown successively according to the instruction of arrow, but these steps are not the inevitable order according to arrow instruction to be held successively
OK.Unless expressly stating otherwise herein, the order that the execution of these steps is not strict limits, and it can be with other suitable
Sequence performs.Moreover, at least a portion step in Fig. 1 can include more sub-steps or multiple stages, these sub-steps or
Person's stage is not necessarily to perform completion in synchronization, but can be performed different at the time of, and its execution sequence also need not
So to carry out successively, but can with other steps either the sub-step of other steps or at least a portion in stage in turn or
Person alternately performs.
In following methods, the detection rising edge of pulse signal is effective.
A kind of method for measuring pulse frequency, comprises the following steps：
Step S100：Receive pulse signal Pulse, standard frequency pulse signal Clock and time sampling signal to be measured
Timer.Standard frequency pulse signal Clock frequency is f1, in one of the embodiments, standard frequency pulse signal
Clock is in general high frequency clock signal.
Fig. 2 is signal timing diagram.
Step S200：Pulse signal Pulse to be measured is counted, between obtaining sampling in time sampling signal Timer
Every the counted number of pulses K that the time is pulse signal Pulse to be measured between T two trigger signals Timer1 and Timer2.Time
Sampling interval duration is also to clip N-1 triggering between T two trigger signals Timer1 and Timer2 in sampled signal Timer
Signal.In one of the embodiments, N=1, i.e. two trigger signals Timer1 and Timer2 are two adjacent triggering letters
Number.In Fig. 2, ClockCnt is standard frequency pulse signal Clock counted number of pulses.
Step S300：Standard frequency pulse signal Clock is counted, it is previous to obtain time sampling signal Timer
First pulses of the trigger signal Timer1 and pulse signal Pulse to be measured between two trigger signals Timer1 and Timer2
Time T1 between P1, and obtain time sampling signal Timer the latter trigger signal Timer2 and pulse signal Pulse to be measured
The time T2 between last pulse P2 between two neighboring trigger signal Timer1 and Timer2.
Specifically, being counted to standard frequency pulse signal Clock, one of pulse signal Pulse to be measured is received
During pulse P1, reset after standard frequency pulse signal Clock counted number of pulses latch；Receive time sampling signal Timer
Previous trigger signal Timer1 when, pulse signal Pulse to be measured counted number of pulses is reset after latching, standard frequency pulse
Signal Clock counted number of pulses is latching to ClockCntBack1, obtains T1=ClockCntBack1/f1；Receive the time
During sampled signal Timer the latter trigger signal Timer2, after pulse signal Pulse to be measured counted number of pulses is latching to K
Reset, standard frequency pulse signal Clock counted number of pulses is latching to ClockCntBack2, obtains T2=
ClockCntBack2/f1。
Step S400：Pulse signal Pulse to be measured frequency f=K/ (T+T1-T2) is obtained, wherein：T is preset value, and T is
The sampling interval duration of time sampling signal.
The method of above-mentioned measurement pulse frequency, is counted to pulse signal to be measured, to obtain adopting in time sampling signal
The counted number of pulses K of pulse signal to be measured between two trigger signals that sample interval time is T；Standard frequency pulse signal is entered
Row counts, and obtains the previous trigger signal of time sampling signal with pulse signal to be measured in the two neighboring trigger signal
Between first pulse between time T1, and obtain trigger signal described in time sampling signal the latter and pulse to be measured and believe
The time T2 between last pulse number between the two neighboring trigger signal；Then pulse signal to be measured is obtained
Frequency f=K/ (T+T1-T2).Calculated by the way that T1 and T2 is introduced, can solve half of pulse problem of head and the tail, substantially reduce very
To eliminating measurement error so that measurement is more accurate.
Because sampling interval duration T can not possibly be oversize (because longer sampling interval duration can not be timely in actual measure
The hysteresis for reflecting the change of pulse frequency and causing to detect and controlling), therefore during the use above method, can be by the sampling interval
Time T is separated into N deciles, starts to use the above method at each decile moment, equivalent in two sampling interval duration T
N+1 wheel measurements are just completed, then the result of measure is filtered and can further improve high frequency stage measurement accuracy, reduce unit
Tested the speed caused by time delay.Fig. 3 is the measurement time chart that sampling interval duration T is separated into N deciles.
A kind of system of the measurement pulse frequency applied to the above method is described below, Fig. 4 is for measurement pulse frequency
The simple block diagram of system.In the following description, the detection rising edge of pulse signal is effective.
A kind of system for measuring pulse frequency, including：
Receiving module 100, for receiving pulse signal Pulse, standard frequency pulse signal Clock and time sampling to be measured
Signal Timer.Standard frequency pulse signal Clock frequency is f1, in one of the embodiments, standard frequency pulse signal
Clock is in general high frequency clock signal.
First counting module 200, for being counted to pulse signal Pulse to be measured, to obtain time sampling signal
Pulse signal Pulse to be measured pulse between sampling interval duration is T in Timer two trigger signals Timer1 and Timer2
Count value K.Between sampling interval duration is T in time sampling signal Timer two trigger signals Timer1 and Timer2 also
Clip N-1 trigger signal.In one of the embodiments, N=1, i.e. two trigger signals Timer1 and Timer2 are adjacent
Two trigger signals.In Fig. 2, ClockCnt is standard frequency pulse signal Clock counted number of pulses.
Second counting module 300, for being counted to standard frequency pulse signal Clock, obtain time sampling signal
Timer previous trigger signal Timer1 and pulse signal Pulse to be measured are between two trigger signals Timer1 and Timer2
First pulse P1 between time T1, and obtain time sampling signal Timer the latter trigger signal Timer2 with it is to be measured
Time between last pulse P2 of the pulse signal Pulse between two neighboring trigger signal Timer1 and Timer2
T2。
Specifically, being counted to standard frequency pulse signal Clock, one of pulse signal Pulse to be measured is received
During pulse P1, reset after standard frequency pulse signal Clock counted number of pulses latch；Receive time sampling signal Timer
Previous trigger signal Timer1 when, pulse signal Pulse to be measured counted number of pulses is reset after latching, standard frequency pulse
Signal Clock counted number of pulses is latching to ClockCntBack1, obtains T1=ClockCntBack1/f1；Receive the time
During sampled signal Timer the latter trigger signal Timer2, after pulse signal Pulse to be measured counted number of pulses is latching to K
Reset, standard frequency pulse signal Clock counted number of pulses is latching to ClockCntBack2, obtains T2=
ClockCntBack2/f1。
Frequency computing module 400, for obtaining the frequency f=K/ (T+T1-T2) of pulse signal to be measured, wherein：T is default
Value, T are the sampling interval duration of time sampling signal.
The system of above-mentioned measurement pulse frequency, is counted to pulse signal to be measured, to obtain adopting in time sampling signal
The counted number of pulses K of pulse signal to be measured between two trigger signals that sample interval time is T；Standard frequency pulse signal is entered
Row counts, and obtains the previous trigger signal of time sampling signal with pulse signal to be measured in the two neighboring trigger signal
Between first pulse between time T1, and obtain trigger signal described in time sampling signal the latter and pulse to be measured and believe
The time T2 between last pulse number between the two neighboring trigger signal；Then pulse signal to be measured is obtained
Frequency f=K/ (T+T1-T2).Calculated by the way that T1 and T2 is introduced, can solve half of pulse problem of head and the tail, substantially reduce very
To eliminating measurement error so that measurement is more accurate.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
- A kind of 1. method for measuring pulse frequency, it is characterised in that including：Pulse signal, standard frequency pulse signal and time sampling signal to be measured are received, the frequency of standard frequency pulse signal is f1；Pulse signal to be measured is counted, to obtain in time sampling signal sampling interval duration as T two trigger signals Between pulse signal to be measured counted number of pulses K；Standard frequency pulse signal is counted, the previous trigger signal of time sampling signal is obtained and believes with pulse to be measured The time T1 between first pulse number between two trigger signals, and obtain described in time sampling signal the latter Time T2 between last pulse of trigger signal and pulse signal to be measured between the two neighboring trigger signal；Its In, when receiving a pulse of pulse signal to be measured, reset after the counted number of pulses latch of standard frequency pulse signal；Receive To time sampled signal the previous trigger signal when, the counted number of pulses of pulse signal to be measured is reset after latching, standard The counted number of pulses of frequency pulse signal is latching to ClockCntBack1, obtains T1=ClockCntBack1/f1；When receiving Between sampled signal the latter described in trigger signal when, the counted number of pulses of pulse signal to be measured is reset after being latching to K, standard frequency The counted number of pulses of rate pulse signal is latching to ClockCntBack2, obtains T2=ClockCntBack2/f1；The frequency f=K/ (T+T1-T2) of pulse signal to be measured is obtained, wherein：T is preset value, and T is the sampling of time sampling signal Interval time.
- 2. the method for measurement pulse frequency according to claim 1, it is characterised in that sampling interval in time sampling signal Time also clips N-1 trigger signal between T two trigger signals.
- 3. the method for measurement pulse frequency according to claim 2, it is characterised in that N=1.
- 4. the method for measurement pulse frequency according to claim 1, it is characterised in that the detection rising edge of pulse signal has Effect.
- A kind of 5. system for measuring pulse frequency, it is characterised in that including：Receiving module, for receiving pulse signal, standard frequency pulse signal and time sampling signal to be measured, standard frequency pulse The frequency of signal is f1；First counting module, for being counted to pulse signal to be measured, to obtain sampling interval duration in time sampling signal The counted number of pulses K of pulse signal to be measured between T two trigger signals；Second counting module, for being counted to standard frequency pulse signal, it is previous described tactile to obtain time sampling signal Time T1 between first pulse of signalling and pulse signal to be measured between two trigger signals, and obtain the time Last of trigger signal described in sampled signal the latter and pulse signal to be measured between the two neighboring trigger signal Time T2 between pulse；Wherein, when receiving a pulse of pulse signal to be measured, the pulsimeter of standard frequency pulse signal Numerical value is reset after latching；When receiving the previous trigger signal of time sampling signal, the pulsimeter of pulse signal to be measured Numerical value is reset after latching, and the counted number of pulses of standard frequency pulse signal is latching to ClockCntBack1, obtains T1= ClockCntBack1/f1；When receiving trigger signal described in the latter of time sampling signal, the pulse of pulse signal to be measured Count value is reset after being latching to K, and the counted number of pulses of standard frequency pulse signal is latching to ClockCntBack2, obtains T2= ClockCntBack2/f1；Frequency computing module, for obtaining the frequency f=K/ (T+T1-T2) of pulse signal to be measured, wherein：T is preset value, and T is The sampling interval duration of time sampling signal.
- 6. the system of measurement pulse frequency according to claim 5, it is characterised in that sampling interval in time sampling signal Time also clips N-1 trigger signal between T two trigger signals.
- 7. the system of measurement pulse frequency according to claim 6, it is characterised in that N=1.
- 8. the system of measurement pulse frequency according to claim 5, it is characterised in that the detection rising edge of pulse signal has Effect.
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| CN106950429A (en) * | 2017-02-27 | 2017-07-14 | 广州市香港科大霍英东研究院 | A kind of position signalling fast decoding method and system |
| CN109490624B (en) * | 2018-10-19 | 2020-11-10 | 陕西长岭电子科技有限责任公司 | Pulse signal frequency measurer |
| CN109737995B (en) * | 2019-01-10 | 2021-05-04 | 安徽酷哇机器人有限公司 | Acquisition system and method of incremental encoder based on distributed timer |
| CN110673532B (en) * | 2019-10-31 | 2020-08-04 | 重庆凯瑞汽车试验设备开发有限公司 | Pulse signal processing and collecting device |
| CN110988467B (en) * | 2019-12-18 | 2022-01-11 | 北京自动化控制设备研究所 | Frequency measurement system and frequency measurement method thereof |
| CN115166284A (en) * | 2022-06-28 | 2022-10-11 | 大陆汽车车身电子系统（芜湖）有限公司 | Frequency signal acquisition system and frequency signal acquisition method |
| CN116908537B (en) * | 2023-09-13 | 2023-12-19 | 西安西电高压开关有限责任公司 | Current voltage frequency calculation circuit and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3985955A (en) * | 1973-11-22 | 1976-10-12 | Siemens Aktiengesellschaft | Apparatus for measuring the distortion of data signals |
| CN102128981A (en) * | 2010-12-29 | 2011-07-20 | 上海大学 | Method for measuring pulse signal period |
| CN102353837A (en) * | 2011-10-10 | 2012-02-15 | 国电联合动力技术有限公司 | Method and device for measuring pulse frequency |
| CN102928677A (en) * | 2012-11-09 | 2013-02-13 | 湖南航天远望测控技术有限公司 | Nano pulse signal acquiring method |
| CN103698602A (en) * | 2013-12-16 | 2014-04-02 | 北京自动化控制设备研究所 | Large dynamic high-precision synchronization continuous frequency measurement method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4126117B2 (en) * | 1998-09-14 | 2008-07-30 | 株式会社鷺宮製作所 | Flowmeter |
-
2015
- 2015-04-21 CN CN201510191123.2A patent/CN104849549B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3985955A (en) * | 1973-11-22 | 1976-10-12 | Siemens Aktiengesellschaft | Apparatus for measuring the distortion of data signals |
| CN102128981A (en) * | 2010-12-29 | 2011-07-20 | 上海大学 | Method for measuring pulse signal period |
| CN102353837A (en) * | 2011-10-10 | 2012-02-15 | 国电联合动力技术有限公司 | Method and device for measuring pulse frequency |
| CN102928677A (en) * | 2012-11-09 | 2013-02-13 | 湖南航天远望测控技术有限公司 | Nano pulse signal acquiring method |
| CN103698602A (en) * | 2013-12-16 | 2014-04-02 | 北京自动化控制设备研究所 | Large dynamic high-precision synchronization continuous frequency measurement method |
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