Reply by Liz December 27, 20032003-12-27
"Sam \(r&#2013265929;p. sans -no-sp-am\)" <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