Notch filter

[y17476]

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 ca
you point me to any source code as example?

Thanks in advance!


Ron

[bharat pathak]

>Hi,
>
>I need to implememt a notch filter to filter 2175 Hz tone on TI C54
DSP.
>Does anyone know if there is source code in TI's application report? o
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.

[SteveSmith]

>Hi,
>
>I need to implememt a notch filter to filter 2175 Hz tone on TI C54
DSP.
>Does anyone know if there is source code in TI's application report? o
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

[Rick Lyons]

On Fri, 09 May 2008 15:10:32 -0500, "y17476" <[email protected]>
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-]

[y17476]

>On Fri, 09 May 2008 15:10:32 -0500, "y17476" <[email protected]>
>wrote:
>
>>Hi,
>>
>>I need to implememt a notch filter to filter 2175 Hz tone on TI C54
DSP.
>>Does anyone know if there is source code in TI's application report? o
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