[hpsdr] Audio resampler

[Warren C. Pratt]

Hi Alan,

This is very helpful.  Just a couple quick comments/questions:

* I will need to write a "high-fidelity" resampler that will produce an 
accurate result on a wideband I-Q data stream.  You said you used 
'linear interpolation'.  Were you referring to linearly interpolating 
between samples, or, linearly interpolating between filter coefficients?

* The PortAudio problem you ran into is interesting.  I seem to remember 
that someone else ran into a problem with not letting PortAudio choose 
the buffer size.

* I was thinking of using a simple (slow) moving average for filtering 
the jittery data.  Good to know that works for you.

* There are several great ideas and some identified pitfalls in your 
notes.  Thanks for sharing your experiences!

73,
Warren  NR0V