CN103176042B - A kind of frequency measurement method, device and frequency meter - Google Patents
A kind of frequency measurement method, device and frequency meter Download PDFInfo
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- CN103176042B CN103176042B CN201110431534.6A CN201110431534A CN103176042B CN 103176042 B CN103176042 B CN 103176042B CN 201110431534 A CN201110431534 A CN 201110431534A CN 103176042 B CN103176042 B CN 103176042B
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Abstract
Embodiments providing a kind of frequency measurement method, device and frequency meter, method includes: input inside digital logic device after measured signal is become the data signal of standard by signal conditioning circuit；Detected the edge of described measured signal by edge sense circuit inside digital logic device；If detecting, the edge of described measured signal occurs, then frequency measurement state of a control machine carries out equally accurate frequency measurement according to frequency measurement command signal or the survey cycle obtains the frequency of described measured signal.The embodiment of the present invention make use of integration and the flexibility of digital logic device, simplify circuit structure, decrease the external environment condition impact on frequency measurement circuit, simultaneously can also be by reset operation recovery original state when system occurs abnormal when, increase the robustness of Frequency Measurement System, finally also add survey cyclic pattern, decrease the measurement time of low frequency signal.
Description
Technical field
The present invention relates to signal measurement field, particularly relate to a kind of frequency measurement method, device and frequency meter.
Background technology
In electronic technology, frequency is one of most basic parameter, and with the measurement side of many electric parameters
Case, measurement result have very close relationship.Therefore the measurement of frequency just seems even more important.
China Patent No. be the patent application of CN2274348Y provide a kind of low cost, equally accurate complete from
Dynamic frequency meter (shown in Fig. 1).Its scheme be by amplification and rectification circuit, gate circuit, counting circuit, with
Step circuit, timing circuit, time base circuit, cpu circuit and display circuit composition.
The operation principle of such scheme is as follows: measured signal inputs from amplification and rectification circuit input, amplifies
Shaping circuit is output as the TTL data signal of standard, the opening time of gate circuit by synchronous circuit control,
Synchronous circuit controls time keeping circuitry simultaneously, so that the initial time of timing and counting is opened with gate circuit
Time synchronized, counting circuit, timing circuit, display circuit pass through data/address bus form and cpu circuit phase
Even, when synchronous circuit sends interrupt requests, cpu circuit reads in and processes in counting circuit and timing circuit
Data, after high accuracy floating-point operation processes, just obtain the measured signal frequency data of equally accurate, and
Control, from selecting range, finally to deliver to display circuit by software by the frequency size measured.When starting to measure,
The I/O end of cpu circuit exports high level to synchronous circuit, and declining occurs in the measured signal after amplifying shaping
Along time, synchronous circuit is output as high level, and cpu circuit measures synchronous circuit when being output as high level, continues
Keeping I/O end to export high level a period of time to synchronous circuit, the length of this retention time is one to set in advance
The fixed value put, afterwards, I/O end is to synchronous circuit output low level, if that now amplifies after shaping is to be measured
When there is trailing edge in signal, synchronous circuit output low level.
Such scheme it is crucial that gate circuit is by synchronous circuit control, and the control of synchronous circuit output
The rising edge of signal is Tong Bu with the trailing edge of the front pulse of the measured signal after amplification shaping, and this control
The trailing edge of signal is Tong Bu, so that gate is electric with the front pulse edge of the measured signal after amplification shaping
The road opening time is the integral multiple in the cycle of measured signal, and then it is intrinsic to ensure not produce mantissa during counting
Quantization error, the frequency values f=N/T of measured signal, the pulse in wherein N is the gate circuit opening time
Number, T is the gate circuit opening time, the frequency height of the frequency measurement accuracy of this method and measured signal
Unrelated, gate circuit open-interval certainty of measurement determine, thus low-and high-frequency signal is had same by realization
The certainty of measurement of sample, i.e. achieves equal precision measurement.
But, such scheme remains following defect:
1, whole scheme uses discrete component to build hardware circuit to realize frequency measurement function, adds PCB
The difficulty of Butut and the difficulty of debugging, the quality of frequency measurement is by external environment such as temperature, humidity, electricity
Pressure, noise impact bigger.
2, synchronous circuit crucial in scheme, is made up of JK flip-flop and phase inverter, once JK flip-flop
Occurring metastable state in circuit, circuit can not eliminate, and will mistake be continued, and causes whole system not
Can normally work.
3, owing to only with equal precision measuring frequency way, this, measuring low frequency signal when, can be greatly increased survey
The amount time.
Summary of the invention
The embodiment of the present invention provides a kind of frequency measurement method, device and frequency meter, is used for simplifying circuit knot
Structure, reduces the external environment condition impact on frequency measurement circuit, increases the robustness of Frequency Measurement System and reduces low frequency
The measurement time of signal.
On the one hand, embodiments providing a kind of frequency measurement method, the method includes: by be measured
Signal is inputted inside digital logic device become the data signal of standard by signal conditioning circuit after；Counting
The internal edge being detected described measured signal by edge sense circuit of word logical device；If detecting described
The edge of measured signal occurs, then frequency measurement state of a control machine carries out equally accurate frequency measurement according to frequency measurement command signal
Or the survey cycle obtains the frequency of described measured signal.
Preferably, in the embodiment of the present invention, frequency measurement state of a control machine carries out equally accurate according to frequency measurement command signal
Frequency measurement includes: when the edge of described measured signal occurs, frequency measurement state of a control machine enables time counting simultaneously
Device and measured signal number timer, when the value of described time counter arrives the gate time and again preset
Secondary edge measured signal being detected occurs, then terminate to measure and according to described time counter and letter to be measured
Number number timer calculates measured signal frequency, the edge wherein detected for twice be all upper edge or under
Edge.
Preferably, the embodiment of the present invention carries out the survey cycle according to frequency measurement command signal to include: treat described
When the edge of survey signal occurs, frequency measurement state of a control machine enables time counter, when letter to be measured again being detected
Number edge when occurring, then terminate to measure and calculate measured signal frequency according to the value of described time counter
Rate, the edge wherein detected for twice is all upper edge or lower edge.
Preferably, the method for the embodiment of the present invention also includes: if after receiving frequency measurement command signal, pass through
Preset Time is not fully complete frequency measurement, then reset Frequency Measurement System.
Preferably, the method for the embodiment of the present invention also includes: automatically carry out frequency according to frequency measurement command signal
Measure, specifically include: judge whether gate time alreadys more than maximum, if the maximum of alreading more than,
Then carry out the frequency surveying cycleoperation to measure measured signal, if not less than maximum, then carry out equally accurate
Frequency measurement operation is to measure the frequency of measured signal.
Preferably, the embodiment of the present invention carries out equally accurate frequency measurement behaviour when gate time not less than maximum
Make to include with measurement measured signal frequency: step 1, transmission trigger an equally accurate and survey after stopping frequency measurement order
Frequently；Step 2, after a stand-by period, judging whether equally accurate frequency measurement completes, if completing, entering step
3, if being not fully complete, enter step 4, the wherein said stand-by period is more than set gate time；Step 3,
Send stop frequency measurement order retaking of a year or grade measured signal counter in time between the value of counter, when described individual
The value of counter is more than predetermined number Nfreq, and the value of described counter and described time counter
Value when at least differing 1, or when the value of described counter is more than predetermined number Nfreq, and currently
When gate time is maximum, frequency measurement completes；Otherwise change gate time and return step 1；Step 4,
Send stop frequency measurement order retaking of a year or grade measured signal counter in time between the value of counter, when described individual
The value of counter is more than predetermined number Nfreq, and the value of described counter and described time counter
Value when at least differing 1, increase the described stand-by period and wait that equally accurate frequency measurement completes；Otherwise change lock
The door time also returns step 1.
On the other hand, the embodiment of the present invention additionally provides a kind of frequency measuring equipment, and this device includes: letter
Number modulate circuit, digital logic device, digital signal processor and Man Machine Interface, described numeral is patrolled
Collect device and include edge sense circuit, frequency measurement state of a control machine and frequency measurement module, wherein: signal condition electricity
Road, for measured signal becomes the data signal of standard, and exports to the edge in digital logic device
Testing circuit and frequency measurement module；Digital signal processor, is used for being received by described Man Machine Interface
The frequency measurement command signal at family；Edge sense circuit, for detecting the edge of described measured signal；Frequency measurement control
State machine processed, for when the edge that described edge sense circuit detects measured signal occurs, according to institute
State frequency measurement command signal control described frequency measurement module carry out equally accurate frequency measurement or the survey cycle obtain described in treat
Survey the frequency of signal.
Preferably, the frequency measurement module of the embodiment of the present invention includes time counter and measured signal number timing
Device, when carrying out equally accurate frequency measurement, described frequency measurement state of a control machine is specifically at described measured signal
When edge occurs, frequency measurement state of a control machine enables time counter and measured signal number timer simultaneously, when
The value of described time counter arrives the gate time preset and again detects that the edge of measured signal goes out
Existing, then terminate to measure, the edge wherein detected for twice is all upper edge or lower edge；Described numeral letter
Number processor is for calculating letter to be measured according to the value of described time counter and measured signal number timer
Number frequency.
Preferably, the embodiment of the present invention when carrying out the survey cycle, described frequency measurement state of a control machine specifically for
When the edge of described measured signal occurs, frequency measurement state of a control machine enables time counter, when again detecting
When edge to measured signal occurs, then terminating to measure, the edge wherein detected for twice is all upper edge
Or lower edge；Described digital signal processor is for calculating letter to be measured according to the value of described time counter
Number frequency.
Preferably, the digital logic device of the embodiment of the present invention also includes reseting module, for receiving survey
Frequently after command signal, if being not fully complete frequency measurement through Preset Time, then reset frequency measuring device.
Preferably, the digital signal processor of the embodiment of the present invention is additionally operable to by described Man Machine Interface
Receiving the automatic frequency measurement command signal of user, described digital signal processor also includes: judging unit, uses
In when receiving automatic frequency measurement command signal, it is judged that gate time has arrived maximum；Equally accurate
Frequency measurement control unit, for when gate time not less than maximum time, carry out equally accurate frequency measurement control；Survey
Periodic Control unit, for when exceeding maximum gate time, carries out surveying periodic Control.
Preferably, the equally accurate frequency measurement control unit of the embodiment of the present invention includes: stop frequency measurement module, uses
Frequency measurement order is stopped in sending；Trigger module, for triggering an equally accurate frequency measurement；First judge module,
For judging whether equally accurate frequency measurement completes after a stand-by period, waiting time is more than set gate
Time；Retaking of a year or grade module, the value of counter between retaking of a year or grade measured signal counter is timely；Second sentences
Disconnected module, for judging whether the value of a counter is more than predetermined number Nfreq, and described counting number
The value of device and the value of described time counter the most at least differ 1, or judge when current gate time is as
When being worth greatly, it is judged that whether the value of described counter is more than predetermined number Nfreq；Gate time changes mould
Block, for when described second judge module judged result is no, changes gate time；Stand-by period changes
Becoming module, for judging that equally accurate frequency measurement is not fully complete when described first judge module, and described second judges
When module is judged as YES, increase the described stand-by period.
On the other hand, the embodiment of the present invention additionally provides a kind of frequency meter, surveys including frequency as above
Amount device.
The embodiment of the present invention make use of integration and the flexibility of digital logic device, simplifies circuit structure,
Decrease the external environment condition impact on frequency measurement circuit, can also pass through when system occurs abnormal when simultaneously
Reset operation recovery original state, increases the robustness of Frequency Measurement System, finally also add survey cyclic pattern,
Decrease the measurement time of low frequency signal.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art,
Do not pay creation laborious on the premise of, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The schematic flow sheet of a kind of frequency measurement method that Fig. 1 provides for the embodiment of the present invention；
The schematic flow sheet that Fig. 2 measures for a kind of automatic frequency that the embodiment of the present invention provides；
The structural representation of a kind of frequency measuring equipment that Fig. 3 provides for the embodiment of the present invention；
The structural representation of a kind of frequency measurement module that Fig. 4 provides for the embodiment of the present invention；
The structural representation of a kind of equally accurate frequency measurement control unit that Fig. 5 provides for the embodiment of the present invention；
The structural representation of a kind of frequency meter that Fig. 6 provides for the embodiment of the present invention.
Detailed description of the invention
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with concrete real
Execute mode and accompanying drawing, the present invention is described in further details.Here, the schematic embodiment party of the present invention
Formula and explanation thereof are used for explaining the present invention, but not as a limitation of the invention.
It is illustrated in figure 1 the schematic flow sheet of a kind of frequency measurement method that the embodiment of the present invention provides, should
Method comprises the steps:
S101: input numeral after measured signal is become by signal conditioning circuit the data signal of standard and patrol
Collect device inside.
In the present embodiment, signal conditioning circuit can be amplified to measured signal, filter, decay etc.
Operation, so that it is converted into the data signal of the standard that digital logic device can identify, it should be pointed out that
, this signal conditioning circuit can't change the frequency of measured signal.And the numeral in the present embodiment is patrolled
Collect device and such as can use i.e. field programmable gate array (Field-Programmable Gate
Array, FPGA), CPLD (Complex Programmable Logic Device,
CPLD) or ASIC (Application Specific Integrated Circuit,
ASIC) etc..
S102: by the edge of edge sense circuit detection measured signal in digital logic device.
In the present embodiment, the upper edge of detection measured signal can both have been set, it is also possible to set letter to be measured
Number lower edge, be not limited at this.
S103: the edge of measured signal occurs if detecting, then frequency measurement state of a control machine instructs according to frequency measurement
Signal carries out equally accurate frequency measurement or the survey cycle obtains the frequency of measured signal.
Frequency measurement state of a control machine in the present embodiment falls within a part for digital logic device, and it can connect
Receive the frequency measurement command signal that issues of user, user such as can by Man Machine Interface to data signal at
Reason device (DSP) issues frequency measurement command signal, is conveyed to frequency measurement state of a control machine by DSP the most again and controls
Frequency measurement operates.In the present embodiment, according to the difference of user instruction, equally accurate frequency measurement can be carried out respectively
Or side cycleoperation.
As one embodiment of the present of invention, frequency measurement state of a control machine carries out waiting essence according to frequency measurement command signal
Degree frequency measurement comprises the steps: that frequency measurement state of a control machine enables number simultaneously when the edge of measured signal occurs
Time counter within word logical device and measured signal number timer, when the value of time counter arrives
Reach default gate time and (this edge type and beginning when the edge of measured signal occurs again detected
During counting, the edge type of institute's foundation is identical, is i.e. all upper edge or lower edge), then terminate to measure and root
Measured signal frequency is calculated according to time counter and measured signal number timer.?
The calculating process of rear frequency can be completed by DSP, it is assumed that the value of time counter is T, measured signal
The value of counter is N, then the frequency of measured signal is f=N/T.
As one embodiment of the present of invention, frequency measurement state of a control machine carries out surveying week according to frequency measurement command signal
Phase comprises the steps: that frequency measurement state of a control machine enables time counter when the edge of measured signal occurs,
When edge measured signal again being detected occurs, then terminate measurement the value meter according to time counter
Calculate measured signal frequency.The calculating process of last frequency can be completed by DSP in the present embodiment,
The value assuming time counter is T, then the frequency of measured signal is f=1/T.
In the present embodiment, only need during equally accurate frequency measurement to use time counter and measured signal counter two
Individual stone counter, decreases a counter relative to 3 counters of prior art, thus saves
The practicality of counter, decreases the waste of hardware resource.As one embodiment of the present of invention, if DSP exists
After receiving frequency measurement command signal, it is not fully complete frequency measurement through Preset Time, then reset frequency measurement state of a control
Machine, time counter and measured signal counter return original state.
As one embodiment of the present of invention, DSP can also receive the automatic frequency measurement command signal of user, so
After carry out automatic frequency measurement, be illustrated in figure 2 the embodiment of the present invention provide a kind of automatic frequency measure
Schematic flow sheet, the method comprises the steps:
S201: judge whether gate time alreadys more than maximum, if the maximum of alreading more than, enters step
S202, if not less than maximum, then enters step S206.
If gate time has arrived maximum, illustrate that measured signal frequency is relatively low, therefore use cycle test method relatively
For properly, otherwise, equal precision measuring frequency way can be used.
S202: trigger and once survey cycleoperation, i.e. DSP send and survey cycles per instruction to frequency measurement state of a control machine,
Controlled corresponding counter by frequency measurement state of a control to carry out surveying cycleoperation.
S203: wait a Preset Time, this Preset Time is more than measured signal cycle time.
S204: judge whether the survey cycle completes, if completing, then the value of retaking of a year or grade time counter, otherwise returns
Return step S203.
S205: judge the maximum cycle the value whether periodic quantity calculated can be surveyed less than equal precision measuring frequency way,
The most then return step S201, otherwise terminate to measure.
S206: send and trigger an equally accurate frequency measurement after stopping frequency measurement order.
Equally accurate frequency measurement specifically may refer to the description of above-described embodiment, does not repeats them here.
S207: through a stand-by period, waiting time is more than set gate time.
S208: judge whether equally accurate frequency measurement completes, if completing, enters step S209, otherwise enters step
S211。
S209: send stop frequency measurement order retaking of a year or grade measured signal counter timely between the value of counter.
S210: judge whether the value of measured signal counter is more than predetermined number Nfreq, and letter to be measured
Number the value of counter and the value of time counter the most at least differ 1, the most then frequency measurement completes, if
Otherwise enter step S213.If it is pointed out that the most maximum gate time, then have only to
The value meeting survey signal counter is more than predetermined number Nfreq, completes with regard to frequency measurement.
S211: send stop frequency measurement order retaking of a year or grade measured signal counter timely between the value of counter.
S212: judge whether the value of measured signal counter is more than predetermined number Nfreq, and letter to be measured
Number the value of counter and the value of time counter the most at least differ 1, if being to increase the described stand-by period
And wait that equally accurate frequency measurement completes, so it is possible to prevent to occur because the stand-by period is inadequate, and is mistakenly considered to survey
Frequency does not complete (if actually waited long enough for, be to complete operation), thus just
It is no longer necessary to change and re-starts equally accurate frequency measurement and operate gate time, save the frequency measurement time.
S213: change gate time and return step S201.Here change and generally refer to gate time increase
Gate time.
The embodiment of the present invention make use of integration and the flexibility of digital logic device, simplifies circuit structure,
Decrease the external environment condition impact on frequency measurement circuit, can also pass through when system occurs abnormal when simultaneously
Reset operation recovery original state, increases the robustness of Frequency Measurement System, finally also add survey cyclic pattern,
Decrease the measurement time of low frequency signal.
It is illustrated in figure 3 the structural representation of a kind of frequency measuring equipment that the embodiment of the present invention provides, should
Device includes: signal conditioning circuit 310, digital logic device 320, digital signal processor 330 and people
Machine interactive interface 340, wherein digital logical processor 320 also includes edge sense circuit 321, frequency measurement shape
State controls machine 322 and frequency measurement module 323.
Signal conditioning circuit 310 is for becoming by measured signal into the data signal of standard, and exports to numeral
Edge sense circuit 321 in logical device 320 and frequency measurement module 323.Signal conditioning circuit 310 is permissible
Be amplified to measured signal, filter, the operation such as decay so that it is converted into digital logic device 320
The data signal of the standard that can identify, this signal conditioning circuit 310 can't change the frequency of measured signal
Rate.And the digital logic device in the present embodiment such as can use FPGA, CPLD or ASIC etc..
Digital signal processor 330 for receiving the frequency measurement instruction letter of user by Man Machine Interface 340
Number.Frequency measurement command signal in the present embodiment such as can include equally accurate frequency measurement, survey cycle or automatically
Frequency measurement etc..
Edge sense circuit 321 is for detecting the edge of measured signal.In the present embodiment, Edge check
Circuit 321 both can set the upper edge of detection measured signal, it is also possible to sets the lower edge of measured signal,
It is not limited at this.
When edge sense circuit 321, frequency measurement state of a control machine 322 is for detecting that the edge of measured signal goes out
Now, control frequency measurement module 323 according to frequency measurement command signal and carry out equally accurate frequency measurement or survey cycle
Frequency to measured signal.
As one embodiment of the present of invention, as shown in Figure 4, frequency measurement module 323 includes time counter
3231 and measured signal counter 3232.
When carrying out equally accurate frequency measurement, frequency measurement state of a control machine 322 is specifically for the edge at measured signal
Enable time counter 3231 and measured signal number timer 3232 during appearance simultaneously, work as time counter
The value of 3231 arrives the gate time preset and again detects that the edge of measured signal occurs, then terminate to survey
Amount.Now digital signal processor 330 is for according to time counter 3231 and measured signal number timing
The value of device 3232 calculates measured signal frequency.The value assuming time counter is T, measured signal number
The value of counter is N, then the frequency of measured signal is f=N/T.
When carrying out the survey cycle, frequency measurement state of a control machine 322 is for making when the edge of measured signal occurs
Energy time counter 3231, when the edge that edge sense circuit 321 detects measured signal again occurs,
Terminate to measure.Now digital signal processor 330 is treated for calculating according to the value of time counter 3231
Survey signal frequency.The value assuming time counter 3231 is T, then the frequency of measured signal is f=1/T.
As one embodiment of the present of invention, time counter 3231 and measured signal counter 3232
Can be with the internal stone counter of common numbers logical device.
As one embodiment of the present of invention, digital logic device 320 can also include a reseting module (not
Illustrate), it is for after receiving frequency measurement command signal, if being not fully complete frequency measurement through Preset Time,
Then reset frequency measurement state of a control machine 322, time counter 3231 and measured signal counter 3232.
As one embodiment of the present of invention, when digital signal processor 330 receives the automatic frequency measurement of user
During command signal, digital signal processor 330 also includes: judging unit 331, equally accurate frequency measurement control single
Unit 332 and survey periodic Control unit 333.
It is illustrated in figure 5 the structural representation of a kind of equally accurate frequency measurement control unit that the embodiment of the present invention provides
Figure, such Precision Measuring Frequency control unit 332 includes: stop frequency measurement module 3321, trigger module 3322,
First judge module 3323, retaking of a year or grade module the 3324, second judge module 3325, gate time change module
3326 and the stand-by period change module 3327.
Stop frequency measurement module 3321 to be used for sending stopping frequency measurement order.
Trigger module 3322 is for triggering an equally accurate frequency measurement, it should be pointed out that at trigger module 3322
Before triggering an equally accurate frequency measurement, stopping frequency measurement module 3321 needs first to send once stopping frequency measurement order,
The situation by last frequency measurement this frequency measurement value of worthwhile one-tenth so it is possible to prevent to occur.
First judge module 3323, should for judging whether equally accurate frequency measurement completes after a stand-by period
Stand-by period is more than set gate time.
Retaking of a year or grade module 3324 is the value of counter between retaking of a year or grade measured signal counter is timely, no matter the
The judged result of one judge module 3323 why, and this retaking of a year or grade module 3324 all says retaking of a year or grade measured signal number
Counter and the value of time counter, and before retaking of a year or grade, stopping frequency measurement module 3321 also can send once stops
Only frequency measurement order.
Second judge module 3325 is for judging that whether the value of a counter is more than predetermined number Nfreq.
And the value of the value of described counter and described time counter the most at least differs 1, or judge when working as
When the early gate time is maximum, it is judged that whether the value of described counter is more than predetermined number Nfreq.
Change module 3326 gate time for when the second judge module 3325 judged result is no, changing
Become gate time, and notification triggers module 3322 triggers equally accurate frequency measurement again, changes gate time here
Generally refer to increase gate time.
Stand-by period changes module 3327 for judging that equally accurate frequency measurement is the completeest when the first judge module 3323
Become, and when the second judge module 3325 is judged as YES, increases the stand-by period, and continue waiting for equally accurate survey
Frequency completes.
The embodiment of the present invention make use of integration and the flexibility of digital logic device, simplifies circuit structure,
Decrease the external environment condition impact on frequency measurement circuit, can also pass through when system occurs abnormal when simultaneously
Reset operation recovery original state, increases the robustness of Frequency Measurement System, finally also add survey cyclic pattern,
Decrease the measurement time of low frequency signal.
It is illustrated in figure 6 the structural representation of a kind of frequency meter that the embodiment of the present invention provides, this frequency meter
600 include that frequency measuring equipment 601, the description of frequency measuring equipment 601 may refer to above-described embodiment
Describe, do not repeat them here.
Above-described detailed description of the invention, is carried out the purpose of the present invention, technical scheme and beneficial effect
Further describe, be it should be understood that the foregoing is only the present invention detailed description of the invention and
, the protection domain being not intended to limit the present invention, all within the spirit and principles in the present invention, done
Any modification, equivalent substitution and improvement etc., should be included within the scope of the present invention.
Claims (7)
1. a frequency measurement method, it is characterised in that described method includes:
Digital logic device is inputted after measured signal is become by signal conditioning circuit the data signal of standard
Internal；
Detected the edge of described measured signal by edge sense circuit inside digital logic device；
If detecting, the edge of described measured signal occurs, then frequency measurement state of a control machine is according to frequency measurement instruction letter
Number carry out equally accurate frequency measurement or the survey cycle obtains the frequency of described measured signal；
Automatically carry out frequency measurement according to frequency measurement command signal, specifically include: judge that gate time is the most
Through exceeding maximum, if the maximum of alreading more than, then carry out the frequency surveying cycleoperation to measure measured signal
Rate, if not less than maximum, then carries out the equally accurate frequency measurement operation frequency with measurement measured signal,
Wherein, equally accurate frequency measurement operation is carried out to measure measured signal when gate time not less than maximum
Frequency includes:
Step 1, transmission trigger an equally accurate frequency measurement after stopping frequency measurement order；
Step 2, after a stand-by period, judging whether equally accurate frequency measurement completes, if completing, entering step
3, if being not fully complete, enter step 4, the wherein said stand-by period is more than set gate time；
Counter between step 3, transmission stopping frequency measurement order retaking of a year or grade measured signal counter are timely
Value, when the value of described counter is more than predetermined number Nfreq, and the value of described counter and institute
State the value of time counter when at least differing 1, or when the value of described counter is more than predetermined number N
Freq, and when current gate time is maximum, frequency measurement completes；Otherwise change gate time and according to survey
Frequently command signal carries out frequency measurement automatically；
Counter between step 4, transmission stopping frequency measurement order retaking of a year or grade measured signal counter are timely
Value, when the value of described counter is more than predetermined number Nfreq, and the value of described counter and institute
State the value of time counter when at least differing 1, increase the described stand-by period and wait that equally accurate frequency measurement completes；
Otherwise change gate time and automatically carry out frequency measurement according to frequency measurement command signal.
2. frequency measurement method as claimed in claim 1, it is characterised in that described according to frequency measurement instruction
Signal carries out the survey cycle and includes:
When the edge of described measured signal occurs, frequency measurement state of a control machine enables time counter, when again
Detect when the edge of measured signal occurs, then terminate to measure and calculate according to the value of described time counter
Going out measured signal frequency, the edge wherein detected for twice is all upper edge or lower edge.
3. frequency measurement method as claimed in claim 2, it is characterised in that described method also includes:
If after receiving frequency measurement command signal, being not fully complete frequency measurement through Preset Time, then reset Frequency Measurement System.
4. a frequency measuring equipment, it is characterised in that described device includes: signal conditioning circuit, number
Word logical device, digital signal processor and Man Machine Interface, described digital logic device includes edge
Testing circuit, frequency measurement state of a control machine and frequency measurement module, wherein:
Signal conditioning circuit, for measured signal becomes the data signal of standard, and exports and patrols to numeral
Collect the edge sense circuit in device and frequency measurement module；
Digital signal processor, for receiving the frequency measurement command signal of user by described Man Machine Interface；
Edge sense circuit, for detecting the edge of described measured signal；
Frequency measurement state of a control machine, for detecting that when described edge sense circuit the edge of measured signal occurs
Time, control described frequency measurement module according to described frequency measurement command signal and carry out equally accurate frequency measurement or survey cycle
Obtain the frequency of described measured signal,
Described digital signal processor also includes:
Judging unit, for when receiving frequency measurement command signal, it is judged that gate time has arrived
Big value；
Equally accurate frequency measurement control unit, for when gate time not less than maximum time, carry out equally accurate survey
Frequency controls；
Survey periodic Control unit, for when exceeding maximum gate time, carry out surveying periodic Control,
Wherein, described equally accurate frequency measurement control unit includes:
Stop frequency measurement module, be used for sending stopping frequency measurement order；
Trigger module, for triggering an equally accurate frequency measurement；
First judge module, for judging whether equally accurate frequency measurement completes after a stand-by period, such
The time for the treatment of is more than set gate time；
Retaking of a year or grade module, the value of counter between retaking of a year or grade measured signal counter is timely；
Second judge module, for judging whether the value of a counter is more than predetermined number Nfreq, and institute
State a value of counter and the value of described time counter the most at least differs 1, or judge to work as front brake
When the door time is maximum, it is judged that whether the value of described counter is more than predetermined number Nfreq；
Gate time changes module, for when described second judge module judged result is no, changes lock
The door time；
Stand-by period changes module, for judging that equally accurate frequency measurement is not fully complete when described first judge module,
And described second judge module is when being judged as YES, increase the described stand-by period.
5. frequency measuring equipment as claimed in claim 4, it is characterised in that when carrying out the survey cycle,
Described frequency measurement state of a control machine controls shape specifically for the frequency measurement when the edge of described measured signal occurs
State machine enables time counter, when edge measured signal again being detected occurs, then terminates to measure,
The edge wherein detected for twice is all upper edge or lower edge；
Described digital signal processor is for calculating measured signal frequency according to the value of described time counter
Rate.
6. frequency measuring equipment as claimed in claim 5, it is characterised in that described digital logic device
Also include reseting module, for after receiving frequency measurement command signal, if being not fully complete frequency through Preset Time
Measure, then reset rate measurement apparatus.
7. a frequency meter, it is characterised in that include the frequency measurement as described in claim 4-6 is arbitrary
Device.
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| CN103383412B (en) * | 2013-07-10 | 2015-08-26 | 珠海许继芝电网自动化有限公司 | A kind of method of self-adaptation software and hardware frequency-tracking sampling |
| CN104007313A (en) * | 2014-05-08 | 2014-08-27 | 深圳市硅格半导体有限公司 | Chip detection method and system in testing process |
| CN105353212B (en) * | 2015-10-13 | 2017-12-29 | 珠海格力电器股份有限公司 | A kind of method and device of detection signal frequency |
| CN106918740B (en) * | 2015-12-28 | 2020-06-19 | 普源精电科技股份有限公司 | Equal-precision frequency measurement device and method |
| CN105467207B (en) * | 2016-01-19 | 2019-07-19 | 江苏省电力公司电力科学研究院 | A kind of high-accuracy voltage power frequency measuring system and method based on intelligent substation |
| CN106918731A (en) * | 2017-02-09 | 2017-07-04 | 深圳市鼎阳科技有限公司 | A kind of digital oscilloscope and its signal frequency measuring method |
| CN109239386A (en) * | 2018-09-11 | 2019-01-18 | 陕西千山航空电子有限责任公司 | A kind of signal acquisition method |
| CN110954745A (en) * | 2019-11-14 | 2020-04-03 | 中国航空工业集团公司西安航空计算技术研究所 | High-precision frequency acquisition method and device based on FPGA |
| CN113533848A (en) * | 2021-06-07 | 2021-10-22 | 杭州加速科技有限公司 | Method and device for measuring digital signal |
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