Sound wave signal detection method based on Liu-cos chaotic system

Abstract

The invention provides a sound wave signal detection method based on a Liu-cos chaotic system. The method comprise steps that a sound wave emitter is used to emit a group of sound wave signals of cosine waves with the pre-regulated frequency of w to a sound wave receiver; after the sound wave receiver receives the sound wave signals of the cosine waves, the signals are converted into electric wave signals of the cosine waves with the same frequency, and the electric wave signals are input to a Liu-cos chaotic system; before the signals are received, parameters of the Liu-cos chaotic system are adjusted so as to allow voltage waves output by the variable y and the variable z to be chaotic wave forms; if the voltage waves output by the variable y and the variable z are changed to be close to 0V direct current voltage from the chaotic wave forms, it shows that the sound wave receiver receives a sound wave signal of a weak cosine wave (or a square wave) with the pre-regulated frequency of w; and if the voltage waves output by the variable y and the variable z are still the chaotic wave forms, it shows that the sound wave receiver fails to receive a sound wave signal of a weak cosine wave (or a square wave) with the pre-regulated frequency of w. According to the invention, the judgment process is simple, the detection method is easy to achieve, and the traditional sound wave detection technology can be replaced.

Description

Technical field [0001] The present invention relates to the field of signal detection, in particular to a method for sound wave signal detection based on Liu-cos chaotic system. Background technique [0002] In the sound wave signal detection, the traditional method is to first amplify and filter the sound wave signal, and then convert it into an electrical signal for detection and identification. This detection method has weak anti-interference ability and cannot distinguish between cosine waves (or square waves) with close frequencies, and the detection effect is not good. At present, people have verified the feasibility of using Duffing chaotic system for acoustic wave detection signal. Because the variable x and y output voltage waveforms of the Duffing chaotic system have only two states: chaos and cosine, and the waveforms of these two states are close and difficult to distinguish, it is impossible to use them for effective acoustic signal detection. Summary of the invent...

AI Technical Summary

Problems solved by technology

Since the output voltage waveforms of the variables x and y of the Duffing chaotic system have only two states of chaos and cosine waves, and the waveforms of these two states are close to each other and difficult to distinguish, it cannot be used for effective acoustic signal detection

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