CN106774638B - A kind of timer calibration method - Google Patents
A kind of timer calibration method Download PDFInfo
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- CN106774638B CN106774638B CN201710055340.8A CN201710055340A CN106774638B CN 106774638 B CN106774638 B CN 106774638B CN 201710055340 A CN201710055340 A CN 201710055340A CN 106774638 B CN106774638 B CN 106774638B
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- timer
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- target data
- sample frequency
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/04—Generating or distributing clock signals or signals derived directly therefrom
- G06F1/14—Time supervision arrangements, e.g. real time clock
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/24—Arrangements for testing
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Electric Clocks (AREA)
Abstract
The invention discloses a kind of timer calibration methods, it is realized based on a system, the system comprises central processing unit, timer and clock modules, the clock module is for providing system clock, described method includes following steps: step S1, when the central processing unit samples target data, the number of samples N of target data is recorded by timer；Step S2, the central processing unit call clock module, obtain the initial time T0' and finish time TN' of target data；Step S3, the central processing unit calculate sample frequency Fs':Fs'=N/ by following formula；Step S4, timer is written in sample frequency Fs' by the central processing unit, to enable timer be timed and counted on the basis of sample frequency Fs'.The present invention can avoid influencing precision of timer because of message processing procedure delay, and then improve data processed result accuracy.
Description
Technical field
The present invention relates to timer more particularly to a kind of timer calibration methods.
Background technique
In the prior art, the timer of some intelligent platforms including smart phone is realized by software timer, soft
One feature of part timer be event arrive after message send to message queue, operating system according to the principle of first in first out at
Manage the message in message queue.Since operating system event to be processed has Unpredictability, often handle what message was spent
Time different length causes the delay for handling timer message, precision of timer is influenced, so that calculating according to sampled data
The result inaccuracy come.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the deficiencies of the prior art, providing a kind of can avoid at because of message
Reason process is delayed and influences precision of timer, and then improves the timer calibration method of data processed result accuracy.
In order to solve the above technical problems, the present invention adopts the following technical scheme that.
A kind of timer calibration method, based on a system realize, the system comprises central processing unit, timer and when
Clock module, the clock module is for providing system clock, and described method includes following steps: step S1, the central processing
When device samples target data, the number of samples N of target data is recorded by timer；Step S2, the central processing
Device calls clock module, obtains the initial time T0' and finish time TN' of target data；Step S3, the central processing unit are logical
It crosses following formula and calculates sample frequency Fs':Fs'=N/；Timing is written in sample frequency Fs' by step S4, the central processing unit
Device, to enable timer be timed and count on the basis of sample frequency Fs'.
Preferably, original sampling frequency Fs is preset in the timer, in the step S4, the central processing unit will
After timer is written in sample frequency Fs', original sampling frequency Fs is replaced by sample frequency Fs'.
Preferably, the system is Android system.
Preferably, the system loading is on a smart phone.
Preferably, the target data is heart rate data.
In timer calibration method disclosed by the invention, after central processing unit receives target data, mentioned with clock module
On the basis of the system clock of confession, target data actual initial time T0' and finish time TN' is obtained, in conjunction with the period
The actual samples frequency Fs' of target data is calculated in interior number of samples, and timer is written in sample frequency Fs' later, is made
Timer sampled and counted according to sample frequency Fs', be based on the above process, the invention avoids because message queue it is excessive
And processing accuracy is influenced, and then improve the accuracy of data processed result.
Detailed description of the invention
The system block diagram of Fig. 1 timer calibration method to realize the present invention.
Fig. 2 is the flow chart of timer calibration method of the present invention.
Fig. 3 is the timing comparison diagram of timer original sampling frequency and actual samples frequency.
Specific embodiment
The present invention is described in more detail with reference to the accompanying drawings and examples.
The invention discloses a kind of timer calibration methods, referring to figs. 1 and 2, are realized based on a system, described
System includes central processing unit 1, timer 2 and clock module 3, and the clock module 3 is for providing system clock, the method
Include the following steps:
Step S1 when the central processing unit 1 samples target data, records target data by timer 2
Number of samples N；
Step S2, the central processing unit 1 call clock module 3, obtain the initial time T0' of target data at the end of
Carve TN'；
Step S3, the central processing unit 1 calculate sample frequency Fs' by following formula:
Fs'=N/TN'-T0'；
Timer 2 is written in sample frequency Fs' by step S4, the central processing unit 1, to enable timer 2 with sampling frequency
It is timed and counts on the basis of rate Fs'.
In above-mentioned timer calibration method, after central processing unit 1 receives target data, it is with what clock module 3 provided
It unites on the basis of clock, target data actual initial time T0' and finish time TN' is obtained, in conjunction with adopting in the period
The actual samples frequency Fs' of target data is calculated in sample number, and timer 2 is written in sample frequency Fs' later, so that fixed
When device 2 sampled and counted according to sample frequency Fs', be based on the above process, the invention avoids due to message queue is excessive
Processing accuracy is influenced, and then improves the accuracy of data processed result.
In the present embodiment, original sampling frequency Fs is preset in the timer 2, in the step S4, the centre
Device 1 is managed by after sample frequency Fs' write-in timer 2, original sampling frequency Fs is replaced by sample frequency Fs'.
The system is Android system as a preferred method,.The system loading is on a smart phone.Actually answer
In, the target data is heart rate data.
Timer calibration method disclosed by the invention, working principle can refer to following examples:
Referring to figure 3., on intelligent mobile phone platform, by presetting, signal is carried out with the speed of sample frequency Fs
The time cycle of sampling, data acquisition is Ts=1/Fs.N number of data can be theoretically acquired in T time.However actual
In sampling process, since intelligent platform uses the reason of software timer, the time interval of actually every segment data acquisition all can
More than or equal to Ts, it is denoted as T1 ', T2 ' ..., TN respectively '.
In order to calibrate the precision of timer, T0, n times sampling are denoted as in the time for an initial time for carrying out signal acquisition
Time later is denoted as TN.Sample frequency after calibration are as follows:
Fs'=N/TN'-T0'；
Sample frequency Fs ' after the calibration newly obtained is substituted original Fs to calculate, can effectively improve number
It is worth precision.In order to track the drift of timer, the real time of the N number of data costs of acquisition is obtained again every the segment record time
Timer is calibrated, the moment obtains the variation of timer.
Such as under smart phone Android operation system, heart rate data acquisition is carried out.Sample frequency 250Hz, sampling are set
Period 4ms.But the sampling period drifts around in 4.3ms in actual sampling process.It is 75 times/min to a heart rate value
People, the heart rate value actually obtained are near 81.In order to calibrate timer, time T0 is recorded at the beginning of being sampled,
Time T250 is recorded after 250 sampled points, calculates new sample frequency are as follows:
Fs'=250/ (T250'-T0')；
Sample frequency after the calibration calculated is 233Hz.Before then recalculating the available ratio calibration of heart rate value
More accurate heart rate value.
Timer calibration method disclosed by the invention, can be effectively relieved the signal errors of the elegant generation of timer, make
It obtains and is possibly realized on intelligent platform according to timer sampling.Meanwhile the present invention can be adopted in the quasi- timer of intelligent platform colonel
The precision of sample, and some numerical value calculated by the data of acquisition can be corrected, for example, by the electrocardiogram of acquisition or
The heart rate value that person's pulse wave data is calculated.
The above is preferred embodiments of the present invention, is not intended to restrict the invention, all in technology model of the invention
Interior done modification, equivalent replacement or improvement etc. are enclosed, should be included in the range of of the invention protect.
Claims (5)
1. a kind of timer calibration method, which is characterized in that based on a system realize, the system comprises central processing unit (1),
Timer (2) and clock module (3), the clock module (3) is for providing system clock, and described method includes following steps:
Step S1 when the central processing unit (1) samples target data, records target data by timer (2)
Number of samples N；
Step S2, the central processing unit (1) call clock module (3), obtain the initial time T0' of target data at the end of
Carve TN'；
Step S3, the central processing unit (1) calculate sample frequency Fs' by following formula:
Fs'=N/ (TN'-T0')；
Step S4, timer (2) are written in sample frequency Fs' by the central processing unit (1), to enable timer (2) with the sampling
It is timed and counts on the basis of frequency Fs'.
2. timer calibration method as described in claim 1, which is characterized in that preset in the timer (2) and initially adopt
In sample frequency Fs, the step S4, after timer (2) are written in sample frequency Fs' by the central processing unit (1), by sampling frequency
Rate Fs' replaces original sampling frequency Fs.
3. timer calibration method as described in claim 1, which is characterized in that the system is Android system.
4. timer calibration method as described in claim 1, which is characterized in that the system loading is on a smart phone.
5. timer calibration method as described in claim 1, which is characterized in that the target data is heart rate data.
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| CN201710055340.8A CN106774638B (en) | 2017-01-25 | 2017-01-25 | A kind of timer calibration method |
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| CN201710055340.8A CN106774638B (en) | 2017-01-25 | 2017-01-25 | A kind of timer calibration method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110968148A (en) * | 2018-09-28 | 2020-04-07 | 珠海格力电器股份有限公司 | Timing calibration method and device and timer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109492185B (en) * | 2018-10-18 | 2022-11-25 | 南京丰道电力科技有限公司 | Method and device for processing sampled data |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7203858B2 (en) * | 2003-12-19 | 2007-04-10 | Intel Corporation | Program clock synchronization in multimedia networks |
| CN101754468B (en) * | 2008-12-18 | 2013-10-30 | 展讯通信（上海）有限公司 | Mobile terminal and clock design method for mobile terminal |
| US9036756B2 (en) * | 2013-01-25 | 2015-05-19 | Cambridge Silicon Radio Limited | Receiver and methods for calibration thereof |
| US9788164B2 (en) * | 2013-07-14 | 2017-10-10 | David Martin | Method and apparatus for determination of kinematic parameters of mobile device user |
| US9685966B2 (en) * | 2014-12-02 | 2017-06-20 | Mediatek Inc. | Fractional dividing module and related calibration method |
| CN104570012B (en) * | 2014-12-29 | 2017-03-08 | 北京无线电计量测试研究所 | A kind of system and method for Beidou navigation signal hardware simulator time-delay calibration |
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| CN110968148A (en) * | 2018-09-28 | 2020-04-07 | 珠海格力电器股份有限公司 | Timing calibration method and device and timer |
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