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Discussion Groups | Comp.DSP | fir decimation filters

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fir decimation filters - saras - 2005-11-23 00:35:00

hi..

I wnat to design a fir decimation filter with 32 taps , input width 16,
coefff width 16 .plz give me suggestions to implement this.


Re: fir decimation filters - Bhaskar Thiagarajan - 2005-11-23 12:13:00

"saras" <s...@yahoo.co.in> wrote in message
news:1...@z14g2000cwz.googlegroups.com...
> hi..
>
> I wnat to design a fir decimation filter with 32 taps , input width 16,
> coefff width 16 .plz give me suggestions to implement this.

Implement this on what?
What are your filter and decimation requirements?

Cheers
Bhaskar


Re: fir decimation filters - Jerry Avins - 2005-11-23 12:39:00



Re: fir decimation filters - Bhaskar Thiagarajan - 2005-11-23 13:33:00



Re: fir decimation filters - saras - 2005-11-24 02:11:00

hi all..
thanks for reply!!

now, the specifications are decimation ratio =2, taps2, input and
coeff width . I want an idea about the filter stuctures  to be used
,so that the no of multiplications can be reduced.


Re: fir decimation filters - saras - 2005-11-25 04:51:00

hi..
any help????????????


Re: fir decimation filters - Andor - 2005-11-26 12:27:00

saras wrote:

> now, the specifications are decimation ratio =2, taps2, input and
> coeff width .

A minimax halfband filter might be a good compromise. Our very own Fred
Marshall has written a free program that computes such coefficients:

ftp://ftp.mission-systems-inc.com/outgoing/Halfband/

I'm not sure whether Meteor can beat this, you might want to have a try
as well:

http://www.cs.princeton.edu/~ken/meteor.html

As far as I remember, at an equal number of taps you can achieve even
better magnitude performance when you drop the linear-phase
requirement, but I don't know any programs to design such FIRs.
Anybody?

Other trade-offs in your design are bandwidth versus stopband
attenuation. Since you haven't posted any requirements or optimality
criteria, it's futile to be more specific.

Regards,
Andor


Re: fir decimation filters - Andor - 2005-11-26 12:27:00

saras wrote:

> now, the specifications are decimation ratio =2, taps2, input and
> coeff width .

A minimax halfband filter might be a good compromise. Our very own Fred
Marshall has written a free program that computes such coefficients:

ftp://ftp.mission-systems-inc.com/outgoing/Halfband/

I'm not sure whether Meteor can beat this, you might want to have a try
as well:

http://www.cs.princeton.edu/~ken/meteor.html

As far as I remember, at an equal number of taps you can achieve even
better magnitude performance when you drop the linear-phase
requirement, but I don't know any programs to design such FIRs.
Anybody?

Other trade-offs in your design are bandwidth versus stopband
attenuation. Since you haven't posted any requirements or optimality
criteria, it's futile to be more specific.

Regards,
Andor