Calculate the single-rate finite, linear convolution of two sequences. The results are stored in the calling vector. The argument names X and H are chosen to suggest FIR filtering. The result of the convolution is defined as follows: 

This finite-length convolution is related to infinite-length by: 

In the above equations, X'[n] and h'[n] are the zero-padded (infinite-length) versions of X[n] and h[n]; y'[n] is the infinite-length output version of y[n]. Then y'[n] is zero everywhere except over: 

FFT, AutoCorrNormal, AutoCorrBiased, AutoCorrUnBiased

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