Recording sound:
WAVRECORD(N,FS,CH)Records N samples at frequency FS. CH is number of channels. Use 1 for the homeworks. Returns a matrix of size N, contiaining the samples
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WAVPLAY(Y,FS)Plays audio stored in vector Y at a sampling rate of FS Hz.
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Plot(Y)Plots vector Y (useful to visualize an audio signal). Plotting at different frequencies:
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x=y ( 1 : N : length(y) );will create a vector x, which is the signal Y at 1/N of its original frequency. (takes every N element of y and puts in in x)
