估算带宽:计算输入信号的单边功率谱密度（ESD）；计算相对于特定值的ESD的最高和最低频率。-Estimation of bandwidth: Calculate the input signal

SPEECH ENHANCEMENT BASED ON WAVELET DENOISING Abstract: - Noise is an unwanted and inevitable interference in any form of communication. It is non-informative and plays the role of sucking the intelligence of the original signal. Any kind of