[Fwd: Re: Nonlinear fir filter design]

Started by Jeff Brower October 26, 2002
Appalayagari Sreedhar-

Yes I agree that for audio applications you would want to stay with linear phase
filters, when possible given real-time processing and memory constraints..

I'm not sure of a good reference for FIR filter design using genetic methods.
posted your response to the group, so hopefully you will receive some

Jeff Brower
DSP sw/hw engineer

-------- Original Message --------
Subject: Re: [matlab] Nonlinear fir filter design
Date: Fri, 25 Oct 2002 19:28:08 +0100 (BST)
From: Appalayagari Sreedhar <>
To: Jeff Brower <
Hi Jeff,

Thanks for clearing the doubts regarding the non linear phase filter.

In my problem i need to optimize the phase so that my filter can be used for
phase required applications like audio etc.

if u can please suggest me any references i will be greatful to u.

i am working on the design of non linear FIR filter design using Genetic

i did the linear FIR filter now i started to work on this subject.

thank u very much,


Jeff Brower <> wrote:

Appalayagari Sreedhar-

Minimum phase FIR filters typically exhibit non-linear phase. You can
convert from
symmetric to minimum phase; so one design method is as follows:

-design the standard FIR filter that meets your specs

-convert to minimum phase

-truncate trailing section of impulse response to
some acceptable limit of tolerance for coefficients
near zero

The objective is to reduce processing time, in cases where non-linear phase

Jeff Brower
DSP sw/hw engineer

> I want to know clearly, what exactly the non linear phase fir filters.
> is the minimum phase fir filters are the nonlinear filters.
> i need to design a non linear filter,please shed some light on this area.

> thank u all,
> and also does the antisymmetric impluse response gives us the nonlinear
phase filter?
> regds,sree.