CN106569032B - A kind of detection method of signal frequency and duty ratio based on embedded microcontroller - Google Patents
A kind of detection method of signal frequency and duty ratio based on embedded microcontroller Download PDFInfo
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- CN106569032B CN106569032B CN201610905453.8A CN201610905453A CN106569032B CN 106569032 B CN106569032 B CN 106569032B CN 201610905453 A CN201610905453 A CN 201610905453A CN 106569032 B CN106569032 B CN 106569032B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
Abstract
The detection method of signal frequency and duty ratio provided by the invention based on embedded microcontroller, the measurement period of signal is determined according to the demand of embedded system, it is enabled that enabled and Interruption is interrupted using the capture of the timer of central processing unit simultaneously, capture the characteristic value when adjacent rising edges arrival of measured pulse signal and characteristic value when failing edge reaches in the same period, the characteristic value of adjacent rising edges is compared operation, obtain the frequency values of measured pulse signal, characteristic value when failing edge is reached with rising edge is compared, to which the duty ratio of measured pulse signal be calculated, simultaneously, the characteristic value captured also only carries out a frequency measuring process to judge and control within a frequency measurement period.The frequency range of the very big measured pulse signal for extending embedded microcontroller of the present patent application, simplify the measurement method of the frequency of the measured pulse signal changed in wider frequency range, reduce the CPU usage of system, additionally it is possible to while measuring the duty ratio of measured pulse signal.
Description
Technical field
The present invention relates to the frequency detecting technologies of micro- electric impulse signal, more particularly, to based on embedded microcontroller
Signal frequency detection method.
Background technique
In automation, intelligent today deeply developed, many signals are related to the measurement of digital waveform, including frequency with account for
Empty ratio.It the use of the frequency and duty ratio of embedded microcontroller measurement square wave is a kind of most popular mode.Due to signal
Frequency from high to low, range is extremely wide, currently, general mode be high-frequency signal measured using the mode of counting, and
Low frequency signal is measured using the mode of timing, presets measurement method according to the actual situation.
It when measuring low frequency signal, is counted using rising signals of the timer clock to signal, calculates one week of waveform
The quantity of timer count signal in phase, it is known that the frequency of timer can calculate the cycle T of signal, to obtain frequency
Rate value.
When low frequency signal uses chronometry measurement frequency, the general mode for using Interruption, if thering is high-frequency signal to connect at this time
Enter, interruption occupies a large amount of central processing unit runing time, and system may can not be jumped out in the interruption of long period, be given
The stability of system brings more risk.
When measuring high-frequency signal, then several waveforms of continuous counter by the way of counting calculate several waves
The time that shape is spent in total, then the period of a complete waveform is calculated, to obtain frequency.But counting procedure generally compares
Complexity, and the quantity counted is difficult to determine.Because the range of high-frequency signal is wider, the highest threshold values and minimum valve of actual measurement
Time of measuring between value is widely different.For example, it is assumed that signal is 1KHz~8KHz, counting is assumed to be 100, then measures 8KHz
The response time needed when signal is 1.25ms, and the response time that 1KHz signal needs is 10ms.Therefore, in the process of development
The quantity for needing micro-judgment to count.
And high-frequency signal is measured using the mode of counting method, if high frequency shelves have low frequency signal to access such as 20Hz, need
5S could count full 100 pulses, and the time of response is very long.
Different measurement methods is selected according to the different frequency range of signal, such mode is easy to use, and it is reliable convenient, but
In the case where unknown object frequency range, there is certain limitation.Under normal conditions, the threshold values of preset high frequency and low frequency must
It must be overlapped, when measured signal is near threshold signal, be easy to produce the mistake of counting method and chronometry switching, and bad boundary
Determine critical frequency.The misconnection or when having more than the signal of measurement range in port, central processing unit may lose response or
Person's collapse, influences the stability of system.In addition, both methods is unable to measuring signal duty ratio.
Summary of the invention
The present invention provide it is a kind of overcome the above problem or at least be partially solved the above problem based on embedded micro-control
The signal frequency detection method of device processed.
According to an aspect of the present invention, a kind of letter based on embedded microcontroller adapting to wider frequency range is provided
The detection method of number frequency, receives and processes measured pulse signal by central processing unit, and according to the need of embedded system
The measurement period for seeking determining signal, within a frequency measurement period, specific measuring process is as follows:
S1, the Interruption that central processing element timer is arranged are enabled and capture is interrupted and enabled；
S2, when a complete waveform of measured pulse signal first rising edge arrive when, timer capture interruption make
Can, external interrupt is triggered, central processing unit obtains and records the First Eigenvalue of measured pulse signal；
S3, when a complete waveform of measured pulse signal second rising edge arrive when, timer capture interruption make
Can, trigger external interrupt, the Second Eigenvalue of the system timer record measured pulse signal of central processing unit；
An impulsive measurement process is completed in S4, confirmation；
Close capture and interrupt enabled, the Second Eigenvalue is compared operation with the First Eigenvalue, be calculated by
Survey the frequency values of pulse signal.
Within a frequency measurement period, by directly measuring the period of a complete waveform, and controls and only carry out one
Frequency measuring process while extension frequency measurement range, simplifies the pulse signal that occurrence frequency changes in wider range
Frequency measurement mode.
According to another aspect of the present invention, the application proposes a kind of while detecting the signal based on embedded microcontroller
The detection method of frequency and duty ratio receives and processes measured pulse signal by central processing unit, and according to embedded system
The demand of system determines the measurement period of signal, and within a frequency measurement period, specific measuring process is as follows:
SS1, the Interruption that central processing element timer is arranged are enabled and capture is interrupted and enabled；
SS2, when a complete waveform of measured pulse signal first rising edge arrive when, timer capture interruption make
Can, external interrupt is triggered, the third feature value of measured pulse signal is obtained by central processing unit and recorded；
SS3, when a complete waveform of measured pulse signal first failing edge arrive when, timer capture interruption make
Can, external interrupt is triggered, by the fourth feature value of the system timer record measured pulse signal of central processing unit；
SS4, when a complete waveform of measured pulse signal second rising edge arrive when, timer capture interruption make
Can, external interrupt is triggered, by the fifth feature value of the system timer record measured pulse signal of central processing unit；
An impulsive measurement process is completed in SS5, confirmation；
Close capture and interrupt enabled, the fourth feature value is compared operation with third feature value, be calculated by
Survey the dutyfactor value of pulse signal；
The fifth feature value is compared operation with third feature value, the frequency of measured pulse signal is calculated
Value.
Within a frequency measurement period, by directly measuring the period of a complete waveform, and controls and only carry out one
Frequency measuring process while extension frequency measurement range, can also measure the duty ratio of measured pulse signal simultaneously.
Detection method provided by the present application based on embedded microcontroller signal frequency and duty ratio, its advantages are such as
Under:
(1) by predeterminated frequency measurement period, and using the timestamp of system beat timing, directly measurement measured pulse letter
The period of a number complete waveform and the frequency that signal is calculated, greatly expand the frequency range of measuring signal, also, institute
It is simple to be related to control program；
(2) it when measuring high-frequency signal, avoids using complicated counting method control program, and adjustment is high repeatedly by rule of thumb
The trouble of frequency signal-count value；
(3) low frequency signal and high-frequency signal are measured, using identical measurement method, without in different measurement methods or difference
It is switched between port；
(4) it avoids low-speed port misconnection high-speed port from leading to the risk of system in case of system halt, it is low to also avoid high-speed port misconnection
Response speed becomes extremely long problem when fast port；
(5) by predeterminated frequency measurement period, the measurement process of a secondary frequencies is only carried out within a frequency measurement period；
(6) by recording or being arranged rising edge or failing edge arrival state when, judges measured pulse signal one completely
The completion status or the completion status in a frequency measurement period of wave period measurement；
It (7), can be with the duty ratio of measuring signal while measuring signal frequency.
Detailed description of the invention
Fig. 1 is according to the structural schematic diagram in the embodiment of the present invention；
Fig. 2 is according to the structural schematic diagram in the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
Shown in Figure 1, a kind of signal frequency detection method based on embedded microcontroller is connect by central processing unit
Measured pulse signal, and the default measurement period that signal is determined according to the demand of embedded system are received and handle, in a frequency
In measurement period, specific measurement process the following steps are included:
S1, the Interruption that central processing element timer is arranged are enabled and capture is interrupted and enabled；
S2, when a complete waveform of measured pulse signal first rising edge arrive when, timer capture interruption make
Can, external interrupt is triggered, central processing unit obtains and records the First Eigenvalue of measured pulse signal；
S3, when a complete waveform of measured pulse signal second rising edge arrive when, timer capture interruption make
Can, trigger external interrupt, the Second Eigenvalue of the system timer record measured pulse signal of central processing unit；
An impulsive measurement process is completed in S4, confirmation；
Close capture and interrupt enabled, the Second Eigenvalue is compared operation with the First Eigenvalue, be calculated by
Survey the frequency values of pulse signal.
When starting to measure the frequency of measured pulse signal, the capture that central processing unit is arranged, which is interrupted, to be enabled,
And after the frequency measurement for completing a complete waveform, close capture interrupt it is enabled, make within a frequency measurement period only into
One frequency measuring process of row.It effectively avoids when carrying out frequency measurement using timing or counting mode, due to high frequency and low
The phenomenon that variation of frequency signal is converted and leads to system in case of system halt or response time overlength.Both reach measurement measured pulse signal frequency
Purpose, meanwhile, and significantly reduce the computational burden of central processing unit, improve the operation effect of central processing unit
Rate.
In addition, in measurement frequency being realized by the direct measurement to a complete waveform of measured pulse signal
, therefore, in measurement process, when the frequency of measured pulse signal is widely varied, does not need to convert accordingly and survey
Amount method, to greatly expand the frequency range of measured pulse signal.Pulse to frequency range in 1Hz~1MHz is believed
Number, without changing any measurement method, can directly measure.
" the First Eigenvalue " in above-mentioned steps S2 is the upper of timer value 1, the timestamp 1 of system beat timing and waveform
The raising of indices knows 1.
" Second Eigenvalue " in above-mentioned steps S3 is the timestamp 2 of timer value 2 and system beat timing.
When the rising edge of measured pulse signal reaches, timer capture interrupts enabled, triggering external interrupt, at this point, together
When recording timer value, system beat timing timestamp and rise mark, and capture in matched comparand register.
Capture and record to three kinds of characteristic values, can more accurately determine that measured pulse signal rising edge reaches when
It carves, meanwhile, it is also convenient for the judgement of the completion status and the completion status in a frequency measurement period to an impulsive measurement.
To the specific steps of the confirmation of a frequency measurement period completion status in above-mentioned steps S4 are as follows:
S41, when a complete waveform of measured pulse signal first rising edge arrive when, be recorded as rise mark 1；
S42, when a complete waveform of measured pulse signal second rising edge arrive when, central processing unit judgement
Rise and identify whether to be 1, if 1, determine that an impulsive measurement process has been completed, and the rising being arranged at this time is identified as 2, into
Row comparison operation；
S43, when the value of timer rises to the system beat period, the Interruption of timer is enabled, triggers system
It interrupts, the value of timer is cleared, and judges the rising mark of central processing unit record, if 1, enters step S42；If
2, determine that an impulsive measurement process is over, mark will be risen and be set as 0, wait and enter next frequency measurement period, after
Continuous step S1.
By judging the state for rising mark, a completed wave of measured pulse signal both can have accurately been captured
Shape can be used for the completion status for determining an impulsive measurement process, make one accurately to measure the frequency of the pulse signal
A frequency measuring process is only carried out in a frequency measurement period.
Meanwhile when the value of timer rises to the system beat period, the value of timer will be cleared, and can be removed in time
The record of redundant data saves the memory space of central processing unit.
The comparison calculation of frequency values in above-mentioned steps are as follows:
Calculate the difference a of timer value 2 and timer value 1；
The difference b of the timestamp 1 of the timestamp 2 and system beat timing of computing system beat timing；
According to difference a and difference b's and, period of you can get it measured pulse signal, and then measured pulse is calculated
The frequency values of signal.
In another embodiment, shown in Figure 2, a kind of signal frequency based on embedded microcontroller is provided and is accounted for
The detection method of empty ratio receives and processes measured pulse signal by central processing unit, and according to the demand of embedded system
The measurement period for determining signal, within a frequency measurement period, specific measuring process is as follows:
SS1, the Interruption that central processing element timer is arranged are enabled and capture is interrupted and enabled；
SS2, when a complete waveform of measured pulse signal first rising edge arrive when, timer capture interruption make
Can, external interrupt is triggered, the third feature value of measured pulse signal is obtained by central processing unit and recorded；
SS3, when a complete waveform of measured pulse signal first failing edge arrive when, timer capture interruption make
Can, external interrupt is triggered, by the fourth feature value of the system timer record measured pulse signal of central processing unit；
SS4, when a complete waveform of measured pulse signal second rising edge arrive when, timer capture interruption make
Can, external interrupt is triggered, by the fifth feature value of the system timer record measured pulse signal of central processing unit；
An impulsive measurement process is completed in SS5, confirmation；
Close capture and interrupt enabled, the fifth feature value is compared operation with third feature value, be calculated by
Survey the frequency values of pulse signal；
The fourth feature value is compared operation with third feature value, the duty ratio of measured pulse signal is calculated
Value.
By to rising edge and failing edge arrival at the time of and state capture, measured pulse signal can be obtained simultaneously
Pulse width and period.
When starting to measure the frequency of measured pulse signal, the capture that central processing unit is arranged, which is interrupted, to be enabled,
And after the frequency measurement for completing a complete waveform, close capture interrupt it is enabled, make within a frequency measurement period only into
One frequency measuring process of row.It effectively avoids when carrying out frequency measurement using timing or counting mode, due to high frequency and low
The phenomenon that variation of frequency signal is converted and leads to system in case of system halt or response time overlength.Both reach measurement measured pulse signal frequency
Purpose, meanwhile, and significantly reduce the computational burden of central processing unit, improve the operation effect of central processing unit
Rate.
In addition, in measurement frequency being realized by the direct measurement to a complete waveform of measured pulse signal
, therefore, in measurement process, when the frequency of measured pulse signal is widely varied, does not need to convert accordingly and survey
Amount method, to greatly expand the frequency range of measured pulse signal.It is in the timer running frequency of embeded processor
In the case where 100MHz, to frequency range 1Hz~1MHz pulse signal, without changing any measurement method
Directly measure.The precision of frequency measurement is within 2% in the case where the most limit.If the timer of embeded processor is transported
Line frequency faster, can measure broader range.
" third feature value " in above-mentioned steps SS2 is timer value 3, the timestamp 3 of system beat timing and waveform
Rise mark 1.
" fourth feature value " in above-mentioned steps SS3 is timer value 4, the timestamp 4 of system beat timing and waveform
Decline mark 1.
" fifth feature value " in above-mentioned steps SS4 is the timestamp 5 of timer value 5 and system beat timing.
When the rising edge of measured pulse signal or failing edge reach, timer capture interrupts enabled, triggering external interrupt,
At this point, simultaneously recording timer value, system beat timing timestamp and rise or fall mark, can more accurately determine
At the time of measured pulse signal rising edge or failing edge reach, meanwhile, it is also convenient for the completion status and frequency to an impulsive measurement
The judgement of the completion status of rate measurement period.
To the specific steps of the confirmation of a frequency measurement period completion status in above-mentioned steps SS5 are as follows:
SS51, when a complete waveform of measured pulse signal first rising edge arrive when, be recorded as rise mark
1；
SS52, when a complete waveform of measured pulse signal first failing edge arrive when, be recorded as decline mark
1；
SS53, when a complete waveform of measured pulse signal second rising edge arrive when, central processing unit is sentenced
It is disconnected to rise mark or decline identifies whether to be 1, if 1, determine that an impulsive measurement process has been completed, and at this time upper is set
It rises and is identified as 2, be compared operation；
SS54, when the value of timer rises to the system beat period, it is into system break, the value of timer is clear
Zero, and judge the rising mark of central processing unit record, if 1, enter step SS53；If 2, an impulsive measurement is determined
Process is over, and will be risen mark and is set as 0, waits the measurement period for entering next frequency and duty ratio, return step
SS1。
By judging the state for rising or falling mark, the pulse of measured pulse signal both can be accurately captured
Width and a complete waveform can be used for determining an impulsive measurement accurately to measure the frequency of the pulse signal at this time
The completion status of process.
Meanwhile when the value of timer rises to the system beat period, the value of timer will be cleared, and can be removed in time
The record of redundant data saves the memory space of central processing unit.
The comparison operation mode of frequency values in above-mentioned steps are as follows:
Calculate the difference c of timer value 5 and timer value 3；
The difference d of the timestamp 3 of the timestamp 5 and system beat timing of computing system beat timing；
According to difference c and difference d's and, the period A of you can get it measured pulse signal, and then measured pulse is calculated
The frequency values B of signal.
The comparison operation mode of dutyfactor value in above-mentioned steps are as follows:
Calculate the difference e of timer value 4 and timer value 3；
The difference f of the timestamp 3 of the timestamp 4 and system beat timing of computing system beat timing；
By the sum of difference e and difference f, the pulse width C of measured pulse signal is obtained；
By pulse width C and period A, the dutyfactor value of measured pulse signal is calculated.
The detection method of signal frequency provided by the present application based on embedded microcontroller, according to the need of embedded system
The measurement period of determining signal is sought, while the capture of application timer is interrupted enabled and Interruption and enabled, and measured pulse is captured
The characteristic value when adjacent rising edges of signal reach, and the characteristic value of adjacent rising edges is compared operation, obtain tested arteries and veins
Rush the frequency values of signal.
Also, the characteristic value that application captures, the completion status and the completion shape in frequency measurement period of determination frequency measurement
State, so that control within a frequency measurement period, as soon as completing a frequency measuring process, no longer carries out frequency measurement, until
Into next frequency measurement period.
The detection method of signal frequency and duty ratio provided by the present application based on embedded microcontroller, according to embedded
The demand of system determines the measurement period of signal, while the capture of application timer is interrupted enabled and Interruption and enabled, and captures
The characteristic value when adjacent rising edges of measured pulse signal reach and the characteristic value in the same period when failing edge arrival, and
The characteristic value of adjacent rising edges is compared operation, the frequency values of measured pulse signal is obtained, failing edge and rising edge is arrived
Up to when characteristic value be compared, so that the duty ratio of measured pulse signal be calculated.
Also, the characteristic value that application captures, the completion status and the completion shape in frequency measurement period of determination frequency measurement
State, so that control within a frequency measurement period, as soon as completing a frequency measuring process, no longer carries out frequency measurement, until
Into next frequency measurement period.
Finally, the present processes are only preferable embodiment, it is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in protection of the invention
Within the scope of.
Claims (5)
1. a kind of signal frequency detection method based on embedded microcontroller, which is characterized in that received by central processing unit
And measured pulse signal is handled, and the measurement period of signal is determined according to the demand of embedded system, a frequency measurement week
In phase, specific measuring process is as follows:
S1, the Interruption that central processing element timer is arranged are enabled and capture is interrupted and enabled；
S2, when first rising edge of a complete waveform of measured pulse signal arrives, timer capture interrupts enabled, touching
External interrupt is sent out, central processing unit obtains and records the First Eigenvalue of measured pulse signal；
S3, when second rising edge of a complete waveform of measured pulse signal arrives, timer capture interrupts enabled, touching
Send out external interrupt, the Second Eigenvalue of the system timer record measured pulse signal of central processing unit；
An impulsive measurement process is completed in S4, confirmation；
Close capture and interrupt enabled, the Second Eigenvalue is compared operation with the First Eigenvalue, calculate timer value 2 and
The difference a of timer value 1, the difference b of the timestamp 1 of the timestamp 2 and system beat timing of computing system beat timing, according to
Difference a and difference b's and, obtain the period of measured pulse signal, the frequency values of measured pulse signal be calculated；
Wherein, the First Eigenvalue is the rising mark 1 of timer value 1, the timestamp 1 of system beat timing and waveform；Institute
State the timestamp 2 that Second Eigenvalue is timer value 2 and system beat timing.
2. a kind of signal frequency detection method based on embedded microcontroller as claimed in claim 1, it is characterised in that: step S4
In " confirmation " specific steps are as follows:
S41, when a complete waveform of measured pulse signal first rising edge arrive when, be recorded as rise mark 1；
S42, when a complete waveform of measured pulse signal second rising edge arrive when, central processing unit judgement rise
Identify whether to be 1, if 1, determine that an impulsive measurement process has been completed, and the rising being arranged at this time is identified as 2, is compared
Compared with operation；
S43, when the value of timer rises to the system beat period, into system break, the value of timer is reset, and sentences
The rising mark of disconnected central processing unit record,
If 1, S42 is entered step；
If 2, determine that an impulsive measurement process is over, mark will be risen and be set as 0, wait and enter next frequency measurement
Period, return step S1.
3. a kind of detection method of signal frequency and duty ratio based on embedded microcontroller is received simultaneously by central processing unit
Measured pulse signal is handled, and determines the measurement period of signal according to the demand of embedded system, a frequency measurement period
Interior, specific measuring process is as follows:
SS1, the Interruption that central processing element timer is arranged are enabled and capture is interrupted and enabled；
SS2, when first rising edge of a complete waveform of measured pulse signal arrives, timer capture interrupt it is enabled,
External interrupt is triggered, the third feature value of measured pulse signal is obtained by central processing unit and recorded；
SS3, when first failing edge of a complete waveform of measured pulse signal arrives, timer capture interrupt it is enabled,
External interrupt is triggered, by the fourth feature value of the system timer record measured pulse signal of central processing unit；
SS4, when second rising edge of a complete waveform of measured pulse signal arrives, timer capture interrupt it is enabled,
External interrupt is triggered, by the fifth feature value of the system timer record measured pulse signal of central processing unit；
An impulsive measurement process is completed in SS5, confirmation；
Close capture and interrupt enabled, the fifth feature value is compared operation with third feature value, calculate timer value 5 and
The difference c of timer value 3, the difference d of the timestamp 3 of the timestamp 5 and system beat timing of computing system beat timing, according to
Difference c and difference d's and, obtain the period of measured pulse signal, the frequency values of measured pulse signal be calculated；
The fourth feature value is compared operation with third feature value, calculates the difference e of timer value 4 and timer value 3,
The difference f of the timestamp 3 of the timestamp 4 and system beat timing of computing system beat timing is obtained by the sum of difference e and difference f
It is calculated to the pulse width of measured pulse signal according to the period of the pulse width of measured pulse signal and measured pulse signal
Obtain the dutyfactor value of measured pulse signal；
Wherein, the third feature value is timer value 3, the timestamp 3 of system beat timing and rising mark 1；Described 4th
Characteristic value is timer value 4, the timestamp 4 of system beat timing and decline mark 1；The fifth feature value is timer value 5
With the timestamp 5 of system beat timing.
4. a kind of detection method of signal frequency and duty ratio based on embedded microcontroller as claimed in claim 3, feature
Be, in step SS5 " confirmation " specific step is as follows:
SS51, when a complete waveform of measured pulse signal first rising edge arrive when, be recorded as rise mark 1；
SS52, when a complete waveform of measured pulse signal first failing edge arrive when, be recorded as decline mark 1；
SS53, when a complete waveform of measured pulse signal second rising edge arrive when, central processing unit judgement on
The raising of indices is known or decline identifies whether to be 1, if 1, determines that an impulsive measurement process has been completed, and the upper raising of indices at this time is arranged
Knowing is 2, is compared operation；
SS54, when the value of timer rises to the system beat period, into system break, the value of timer is reset, and
Judge the rising mark of central processing unit record,
If 1, SS53 is entered step；
If 2, determine that an impulsive measurement process is over, mark will be risen and be set as 0, waited and entered next frequency and account for
Sky is than measurement period, return step SS1.
5. a kind of detection method of signal frequency and duty ratio based on embedded microcontroller as claimed in claim 3, feature
Be: the timer is the locking phase loop voltag or other systems timer of central processing unit.
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| CN104635046A (en) * | 2015-02-15 | 2015-05-20 | 金陵科技学院 | Modulation domain frequency counter and continuous frequency measurement method thereof |
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| JPH05312975A (en) * | 1992-05-07 | 1993-11-26 | Matsushita Electric Ind Co Ltd | Frequency discriminator |
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Effective date of registration: 20190530 Address after: 410100 Xingsha Industrial Base (Changlong Street), Changsha Economic and Technological Development Zone, Changsha City, Hunan Province, No. 1259, Liangtang East Road Patentee after: Kaiyuan Instrument Co., Ltd., Changsha Address before: 410100 No. 172 Kaiyuan Road, Changsha economic and Technological Development Zone, Hunan Patentee before: Changsha Kaiyuan Instruments Co., Ltd. |