Rocky wrote:
> 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
>

Moi. Heretical?
All I've done is suggest DSP be done in TECO, COBOL, or VBA in MSWord ;}