This paper introduces both the method of the spectrum-coding transmission of digital signal and that of wavelet threshold de-noising in detail

and also studies the performance of the method of wavelet threshold de-noising used in the bipolar linear-phase coding.To find the best scheme of wavelet de-noising

various parameters that influence the performance of wavelet de-noising are studied in this paper.In the end

the statistics of the operational volume of wavelet de-noising is made.The result indicates that the wavelet transform has practical value in the performance of de-noising and real-time processing.