A New Signal De-noising Method Based on Fractional Wavelet Packet Transform in Time-frequency Domain

A novel signal de-noising method based on fractional wavelet transform(FRWT) was proposed.The optimal fractional order of FRWT was obtained by a genetic algorithm according to the SNR of output signals.And the signal was de-noised by an optimal FRWT.De-noising results of noisy speech signal showed that the de-noising effect can be improved effectively.