upfirdn
PURPOSE 
% Upsample, filter and downsample a signal.
SYNOPSIS 
function yout = upfirdn(xin,h,p,q)
DESCRIPTION 
CROSS-REFERENCE INFORMATION 
This function calls:
- downsample % Downsample the signal, selecting every nth element. If @var{x}
- upsample % Upsample the signal, inserting n-1 zeros between every element.
This function is called by:
- fracshift % Shift the series @var{x} by a (possibly fractional) number of samples @var{d}.
- resample % Change the sample rate of @var{x} by a factor of @var{p}/@var{q}. This is
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