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为了避免因采样频率而引起系统输出发散,文章提出采用模拟电路来仿真参数可调非线性双稳态系统,并实现对双模噪声中信号的检测.首先利用PC提供控制信号,经串行口传输至单片机,单片机经过适当的换算后,再通过I2C总线控制数字电位器,通过改变电位器的抽头位置,能方便地改变其分压系数,从而灵活调节系统参数.当噪声、信号和非线性系统的达到某一协同作用,系统将部分噪声能量转化为信号能量,就会产生最大共振峰,从而将淹没在噪声中的被测信号检测出来.仿真表明,该方法能够有效抑制双模噪声,提取出信噪比较高的有用信号.
In order to avoid the divergence of system output caused by the sampling frequency, the paper proposes to simulate the adjustable nonlinear bistable system by using analog circuit and realize the signal detection in dual-mode noise.Firstly, the control signal is provided by PC, Transmitted to the microcontroller, the microcontroller after appropriate conversion, and then control the digital potentiometer through the I2C bus, by changing the potentiometer tap position, can easily change its partial pressure coefficient, and thus flexible adjustment of system parameters.When noise, signal and nonlinearity When the system reaches a certain synergy, the system will convert part of the noise energy into signal energy, which will produce the maximum formant, so as to detect the signal which is submerged in the noise.The simulation shows that this method can effectively suppress the dual-mode noise, Extract useful signals with high SNR.