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Re: [Discuss-gnuradio] USRP2 Filtering/Decimation Question

From: Bruce McGuffin
Subject: Re: [Discuss-gnuradio] USRP2 Filtering/Decimation Question
Date: Fri, 4 Sep 2009 17:01:59 -0400
User-agent: Thunderbird (X11/20090625)

Matt Ettus wrote:
Bruce McGuffin wrote:

When I specify a particular receiver decimation rate
for the USRP2, the task of decimating is presumably
split up between the CIC and two half-band filters.
My question is how is the task split up,
and where in the code does this happen?

If the requested decimation rate is a multiple of four, we use the two halfband filters, and the rest is CIC. If it is only a multiple of two, we use one halfband filter and the rest in CIC. If it is an odd number, we use only CIC.

When the decimation rate is divisible by 2 but not 4, which half-band filter do you use?
And where in the code is this decision made?


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