该函数用于绘制信号fft范数、相位与频率、信号与时间之间的关系。

Plot signal fft norm and phase versus frequency and signal versus time.

以下为本函数的可选输入项：

optionnal input argument: 

- 'legend': 'signal name' 

- 'window': 'none', 'hann', 'hamming', 'flattop', 'blackman', 'blackmanharris' 

- 'MaxNorm': if norm is lower than this value, angle is forced to 0. 

(angle makes no sense for small norm) 

- 'fmin': display frequency fmin to fs/2 

- 'fmax': display frequency 0 to fmax 

- 'style': 'line', 'stem', 'bar'

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