【摘要】 在单片机系统工作环境中存在着各种噪声干扰,尽管已采取了一些抗干扰措施,但不可避免会有噪声进入系统。该文根据单片机系统中的信号特点,基于小波变换自动变焦功能,提出用小波变换对含噪信号进行去噪。基于小波变换的去噪是在对含噪信号进行分解的过程中,通过门限方法抽取有用信号的小波系数,然后重建而得以实现。仿真结果表明了在单片机控制系统中利用小波变换进行信号去噪的可行性和有效性。更多还原

【Abstract】 Due to all kinds of noise in the working surroundings of Single-Chip Microcontroller systems(MCS), though many measures to resist noise are taken, there is still noise penetrating the system inevitably. According to the characteristics of signal in MCS and the function of automatically changing focus of wavelet transform, this paper presents that the noise in the signal can be decreased with the method of wavelet transform. In the process, signal with noise can be decomposed into a series of wavelet coefficients by means of wavelet transform, some of which can be omitted by a gate value, then the original signal with decreased noise can be reconstructed by the processed coefficients. Simulation results demonstrate that this method is feasible and validated to decrease noise in the Single-Chip Microcontroller systems.更多还原