convol(1)

NAME
convol - convolution (overlap add method)

CALLING SEQUENCE
[y,y1]=convol(h,x,y0)
[y]=convol(h,x)

PARAMETERS

x,h :input sequences (h is a "short" sequence, x a "long" one)

y0  : old piece to overlap add

y   : output of convolution

y1  : new piece to overlap add

DESCRIPTION
calculates the convolution y= h*x of two discrete sequences by the overlap add method (fft).

EXAMPLE
For x=[x1,x2,...,]
First call : [y,y1]=convol(h,x1)
Subsequent calls : [y,y1]=convol(h,xk,y1).

SEE ALSO
corr,fft,pspec and polynomial product.

AUTHOR
F. D , C. Bunks Date 3 Oct. 1988