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Low-velocity pulse period collecting method based on anti-interference low-pass filtering

A technology of pulse period and low-pass filtering, which is applied in frequency-to-pulse sequence conversion and frequency measurement devices, etc., can solve problems such as poor anti-interference ability and inaccurate counting, and achieve the goal of improving frequency measurement accuracy and efficient and reliable real-time acquisition Effect

Active Publication Date: 2014-04-30
CHENGDU YIMENG HENGXIN TECH
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Problems solved by technology

[0005] In order to overcome the technical defects of inaccurate counting and poor anti-interference ability in the existing pulse frequency acquisition method, the present invention discloses a low-speed pulse period acquisition method and device based on anti-interference low-pass filtering

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  • Low-velocity pulse period collecting method based on anti-interference low-pass filtering
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  • Low-velocity pulse period collecting method based on anti-interference low-pass filtering

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Embodiment Construction

[0025] The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] The low-speed pulse period acquisition method based on anti-jamming low-pass filtering of the present invention includes an acquisition process and an operation process, and the acquisition process includes at least two counting units, and the counting unit includes the following steps:

[0027] The S1 edge detection module detects the transition edge of the collected signal and records the time T of the signal edge, and outputs the edge trigger signal to the interval timer at the same time;

[0028] After the interval timer of S2 receives the edge trigger signal, it starts counting, and outputs a detection enable signal to the level detection module after the DT moment, and the DT is a preset delay;

[0029] After receiving the detection enable signal, the level detection module in S3 detects the level state of the input sig...

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Abstract

A low-velocity pulse period collecting method based on anti-interference low-pass filtering comprises a collection process and an operation process. At least two counting units are adopted in the collection process. The collection process comprises the steps that collected signals are input until two counting units with the legal ARS continuously appear, T of one counting unit is recorded as T1,T of the other counting unit is recorded as T2, and the measuring frequency F0 of the collected signals is worked out according to T1 and T2; the collection process is repeatedly carried out many times. The operation process comprises the step that the algorithm filtering is carried out on F0 obtained from many times of carrying out collecting processes to obtain the filtering frequency of the collected signals. The invention further discloses a low-velocity pulse period collecting device based on the anti-interference low-pass filtering. By means of the low-velocity pulse period collecting method and device based on the anti-interference low-pass filtering, the interference to a counter from the high-frequency interference pulse is effectively resisted through a low-pass filtering method, and frequency measuring precision is improved.

Description

technical field [0001] The invention belongs to the field of electronic communication, and relates to a signal acquisition method and device, in particular to a low-speed pulse cycle acquisition method and device based on anti-interference low-pass filtering. Background technique [0002] In today's frequency collection with pulse output sensors, the pulse counting method is mainly used. The biggest problem with this method is that when the pulse counting frequency and the acquisition frequency coincide, there will be a problem of counting more than 1 and less than 1, and the existing pulse counting method is susceptible to interference. When interfering pulses are superimposed on the measured square wave signal, the pulse timing The device will also count the edges of the interference pulse, making the count deviation. [0003] Although a large number of acquisitions can be used to reduce the error, but at the same time there will be problems such as poor real-time measure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/10
Inventor 王春波王宏强
Owner CHENGDU YIMENG HENGXIN TECH
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