Signal processing method and device

The invention discloses a signal processing method and device, and the method comprises the steps: carrying out the synchronous collection of a plurality of paths of signals through an ADC, and obtaining a plurality of paths of input signals; performing sampling frequency adjustment on the multi-path input signals to obtain alignment signals; performing accumulation average operation on the alignment signal to obtain a preliminary noise reduction signal; and performing wavelet decomposition on the preliminary noise reduction signal according to a preset wavelet basis function to obtain a de-noised signal. Through the above steps, during preliminary noise reduction, a processing period can be shortened by setting a small number of accumulated average times, and the signal-to-noise ratio of a denoised signal is improved through wavelet decomposition noise reduction subsequently. That is to say, by carrying out two noise reduction treatments of preliminary noise reduction and wavelet decomposition noise reductio