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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] Basic question about filter |
Date: | Mon, 18 Jun 2012 21:54:11 -0400 |
User-agent: | Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.15) Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10 |
On 18/06/12 09:46 PM, signalswdm wrote:
Actually, in typical architectures using I/Q, there are low-pass filters *in front* of the ADC to eliminate aliasing prior to sampling. So the CIC decimator "sees" a signal that has already been band-limited appropriate to the sample rate of the ADCs. The CIC decimation process *is* filtering, so out-of-band products appearing at the output are usually suppressed by at least 80dB, and usually more. -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org |
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