.m program	page	.mat	what it does
Ex91	481	none	Effects of rectangular and Hamming data windows
Ex92	483	Ex92	Hamming window reveal presence of sinusoids
Ex93	484	none	Effects of windows and length on resolving two sinusoids
Ex94	487	Ex94	Spectrogram of tonal version of ''The Victors''
Ex96	489	none	Spectrogram of a chirp signal
Ex914	509	sym	IIR Butterworth lowpass filter design
Ex915	510	sym	Comparison of lowpass filter designs