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Discussion Groups | Comp.DSP | EVRC/butterworth filter

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EVRC/butterworth filter - Gerard Lyonnaz - 2004-10-12 03:02:00

 Is there somewhere a free code of a EVRC coodec?
 Or at least a sample of the first 6th order Butterworth filter?

 Gerard

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Re: EVRC/butterworth filter - Steve Underwood - 2004-10-12 04:44:00

Gerard Lyonnaz wrote:

> Is there somewhere a free code of a EVRC coodec?
> Or at least a sample of the first 6th order Butterworth filter?
>
> Gerard
>  
>
The best place to look for an example implementation of most codecs 
these days is the reference code published with the specs. However, I 
don't think the EVRC specification or code if freely downloadable. If 
you have the specification, I would have thought you would also have the 
reference code.

Excuse me for asking, but why do you need help with probably the most 
trivial problem in implementing a codec? Almost any IIR filter designer 
should produce a usable Butterworth implementation for you, although 
some produce a single stage and leave you to break it into bi-quads.

Regards,
Steve