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Re: [Discuss-gnuradio] Transition bandwidth

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] Transition bandwidth
Date: Thu, 6 Jan 2005 23:28:36 -0800
User-agent: Internet Messaging Program (IMP) 4.0-cvs

Quoting David Carr <address@hidden>:

> What is the technical definition of transition bandwidth?  I've not ever
> come across this term in my readings.
> I understand cutoff to be the -3 db point.  Is the transition bandwidth
> the distance between the -3db point
> and something like the -60db point or what?

The definition is kind of loose, but typically it means from fc (-3dB) to the
first null in the stopband if there is one, or to where you essentially have
the max attenuation.

The transition bandwidth is what actually controls the number of taps.  A filter
with a cutoff of .1*nyquist and one on .4*nyquist but both having the same size
of transition band would have the same number of taps.


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