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A New Method of Vibration Waveform Endpoint Detection Based on Short-term Energy

A technology of vibration waveform and endpoint detection, which is applied in mechanical vibration actuation of anti-theft alarms, measurement of ultrasonic/sonic/infrasonic waves, measuring devices, etc. Problems such as large amount of computation

Inactive Publication Date: 2017-03-29
CHINA ELECTRONIS TECH INSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has a large amount of data calculation, is not real-time, and has no effective vibration waveform judgment mechanism, which cannot meet the needs of real-time monitoring of intrusion around the fiber optic fence.

Method used

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  • A New Method of Vibration Waveform Endpoint Detection Based on Short-term Energy
  • A New Method of Vibration Waveform Endpoint Detection Based on Short-term Energy
  • A New Method of Vibration Waveform Endpoint Detection Based on Short-term Energy

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Embodiment 1

[0019] The present invention is a new method for detecting vibration signal endpoints of an MZ optical fiber perimeter intrusion monitoring instrument. The specific process is as follows: figure 1 shown. The method includes the following steps:

[0020] Step 1. Calculate data energy in segments;

[0021] Segment the data to be processed into equal length segments, and calculate the energy of the segmented data separately.

[0022] Step 2. Find data fragments greater than the energy threshold;

[0023] Traversing backwards from the beginning of the segmented data energy, looking for data segments greater than the threshold, and recording the subscripts of the starting and ending points respectively.

[0024] Step 3. fragment integration;

[0025] For the data fragments recorded in step 2 that are greater than the threshold, compare the distance between adjacent data fragments with the threshold of the number of non-vibrating fragments. If the distance between adjacent data ...

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Abstract

The invention provides a new vibration waveform endpoint detection method based on short-time energy. The new vibration waveform endpoint detection method particularly includes the following steps: (1) the data energy is calculated in a subsection mode; (2) data slots larger than an energy threshold value are searched; (3) the data slots are integrated; (4) narrow wave filtering is carried out. By means of the scheme, in vibration waveform effectiveness judgment, invalid vibration signals are filtered out through a narrow wave filtering threshold value, invalid follow-up operation is reduced, and the system false alarm rate is lowered. Compared with the prior art, the algorithm operation operand is small, instantaneity is high, reliability is high, and the false alarm rate is low.

Description

technical field [0001] The invention belongs to the technical field of vibration waveform endpoint detection, and in particular relates to a new method for detecting vibration waveform endpoints based on short-term energy. Background technique [0002] Based on the Mach-Zehnder interference principle, the MZ optical fiber perimeter intrusion monitoring instrument uses optical fiber cables to detect external vibrations and identify illegal intrusions. It has strong anti-electromagnetic interference and can realize long-distance real-time monitoring and positioning of vibrations caused by perimeter intrusions. As the key technology of the perimeter security system, the real-time precise positioning of intrusion is one of the main research directions of the perimeter detection and early warning system. In practical applications, signals are collected into the system in real time. If a series of calculations are performed on all input signals, the system will inevitably fail to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08B13/16G01H9/00
CPCG01H9/004G08B13/124
Inventor 王广彪魏石磊袁明李宝瑞
Owner CHINA ELECTRONIS TECH INSTR CO LTD