Jon Harris wrote:
> "Jerry Avins" <[email protected]> wrote in message
> news:[email protected]..
> > Richard Owlett wrote:
> >> I think I know the answers, but then again
> >>
> >> I have a "hobby" project to evaluate intelligibility of speech with varying
> >> parameters ( primarily sample rate and bandwidth ).
> >>
> >> [ for perspective, in a previous incantation I "discovered" formants ;]
> >>
> >> My sample universe is a reading of the Bible recorded under studio
> >> conditions. As it is a commercial recording, I'm assuming Nyquist is the
> >> least restrictive criterion it meets.
> >>
> >> Am I correct thinking that if I digitally filter my source to less than 3 kHz
> >> i can safely decimate to 8 kHz sample rate?
> >
> > Yes
>
> And if you filter is good enough, you can push the cut-off further up toward
> 4kHz.

You might want to consider a slightly heretical approach and set the
filter ABOVE nyquist! Use aliasing as one of the parameters. Try about
5KHz cuttoff with 8KHz sampling rate.

I think you might be surprised at the results if it is only speech you
are evaluating.

Regards
Rocky