[linux-audio-dev] Re: Looking for fast integer resampling code

Erik de Castro Lopo erikd-lad at mega-nerd.com
Mon Jun 13 08:49:38 EDT 2005


Kjetil Svalastog Matheussen wrote:

> I was primarily testing speed, but both libraries where using the sinc
> routine, so...

Yes, but you can design a sinc filter with 10 coefficients and one
with 10000. The one with 10000 coefficients will have a steeper 
transition band and a better signal to noise ratio.

> When I compaired mus_src with width=5, and libsamplerate with
> SRC_SINC_FASTEST, the first one is much faster, I don't know what kind of
> SNR/Bandwidth you get with your way of measuring when using mus_src with
> width=5, but the source is easy to read so I guess you can figure it out.

The SNR and bandwith cannot be determined by reading code. Measurement
is the only option.

Erik
-- 
+-----------------------------------------------------------+
  Erik de Castro Lopo  nospam at mega-nerd.com (Yes it's valid)
+-----------------------------------------------------------+
"To me C++ seems to be a language that has sacrificed orthogonality
and elegance for random expediency." -- Meilir Page-Jones


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