function pitchwatch(x,Ts) Plot the pitch keys. pitchwatch(x,[Ts]) :: Syntax The array x is the input signal and Ts is the (optional) sampling period. Example on use: [x,Fs] = wavread( Hum.wav ) pitchwatch(x,1/Fs) :: Inf

• Plot the noisy speech signal both in time-domain and frequency-domain. • 进行含噪语音信号的时频分析 • Design a proper filter to remove noise from the speech signal. • 设计合适滤波器进行去噪 • Plot the clean signal both in time-domain

利用matlab对声音信号进行傅里叶变换，得到信号的频率图，进而对信号的特征进行分析。-Use of matlab Fourier transform of the sound signals, to get the signal frequency plot, and then analyze the characteristics of the signal.

工程测试信号 信号发生器 可产生多种波形并绘制，还可播放声音-Engineering test signal generator can produce a variety of signal waveforms and plot, but also play a sound