[asterisk-users] Sox and bad quality when converting to 8 kHz

[Steve Edwards]

On Fri, 25 Mar 2011, Steve Underwood wrote:

> You really need to remove the bass end of the spectrum before downsampling to 
> 8k/s. uLaw/ALaw sound pretty muddy and horrible if you don't do that, and the 
> other common 8k/s codecs don't sound any better. Jean-Marc Valin wrote a 
> little filtering utility for this purpose.

A link?

Casual googling didn't yield anything promising.

-- 
Thanks in advance,
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Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
Newline                                              Fax: +1-760-731-3000