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From: | Bruce McGuffin |
Subject: | Re: [Discuss-gnuradio] USRP2 Filtering/Decimation Question |
Date: | Fri, 4 Sep 2009 17:01:59 -0400 |
User-agent: | Thunderbird 2.0.0.22 (X11/20090625) |
Matt Ettus wrote:
When the decimation rate is divisible by 2 but not 4, which half-band filter do you use?Bruce McGuffin wrote:Hi 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.Matt
And where in the code is this decision made? Bruce
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