Forums

Notch filter

Started by y17476 May 9, 2008
Hi,

I need to implememt a notch filter to filter 2175 Hz tone on TI C54x DSP.
Does anyone know if there is source code in TI's application report? or can
you point me to any source code as example?

Thanks in advance!


Ron
>Hi, > >I need to implememt a notch filter to filter 2175 Hz tone on TI C54x
DSP.
>Does anyone know if there is source code in TI's application report? or
can
>you point me to any source code as example? > >Thanks in advance! > > >Ron
Whats the value of sampling frequency Fs? a simple approach is to design a 3 tap FIr notch. h[n] = [1 -2*cos(2*pi*f0/Fs) 1]; where f0 is 2175 hz in your case and Fs u need to tell. Also the notch will not be normalized. hence u might need a multiplier to scaleup/down freq resp. h_norm[n] = b0 * h[n] For better notch designs try remez design for FIR, or try 2nd order notch filters for iir (reference proakis manolakis). Regards Bharat Pathak Arithos Designs www.Arithos.com DSP Design Consultancy and Training company.
>Hi, > >I need to implememt a notch filter to filter 2175 Hz tone on TI C54x
DSP.
>Does anyone know if there is source code in TI's application report? or
can
>you point me to any source code as example? > >Thanks in advance! > > >Ron >
Hi Ron, Here a link on IIR notch filters. Regards, Steve http://www.dspguide.com/ch19/3.htm
On Fri, 09 May 2008 15:10:32 -0500, "y17476" <rong.r.wang@gmail.com>
wrote:

>Hi, > >I need to implememt a notch filter to filter 2175 Hz tone on TI C54x DSP. >Does anyone know if there is source code in TI's application report? or can >you point me to any source code as example? > >Thanks in advance! > > >Ron
Hi Ron, I'm not able to help you on this but I remember that Tex. Instr. had all sorts of Applications Notes on the Internet. I'll bet one of those will help you. Good Luck, [-Rick-]
>On Fri, 09 May 2008 15:10:32 -0500, "y17476" <rong.r.wang@gmail.com> >wrote: > >>Hi, >> >>I need to implememt a notch filter to filter 2175 Hz tone on TI C54x
DSP.
>>Does anyone know if there is source code in TI's application report? or
can
>>you point me to any source code as example? >> >>Thanks in advance! >> >> >>Ron > >Hi Ron, > I'm not able to help you on this >but I remember that Tex. Instr. had >all sorts of Applications Notes on the >Internet. I'll bet one of those will >help you. > >Good Luck, >[-Rick-] >Thanks you all!
Ron