"Sam \(r�p. sans -no-sp-am\)" <totalsam-no-sp-am@hotmail.com> wrote in message news:<3fede164$0$736$5402220f@news.sunrise.ch>...
> Hi all !
>
> I am looking for the coefficients for a FIR filter to compute the
> pre-deemphasis 50/15 us. Does anybody know them ?
>
> Are there any IC that can do it without having to use a DSP ?
>
> Thanks in advance !
>
> Sam
You don't want to use FIR. The original standards are based on analog
filters, so you should use IIR. This will give flat amplitude/phase
for the whole system (if the pre-emph is linear-phase and the de-emph
is analog or IIR, the composite phase response will not be flat) Since
its a single pole-zero system, you can manually wiggle the 2
coefficients to fit the analog design and get pretty close pretty
fast. It will never match the analog system perfectly, but you can get
"close enough".
Bob Adams
Reply by ●December 27, 20032003-12-27
Hi all !
I am looking for the coefficients for a FIR filter to compute the
pre-deemphasis 50/15 us. Does anybody know them ?
Are there any IC that can do it without having to use a DSP ?
Thanks in advance !
Sam