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Re: [Discuss-gnuradio] Half-Band Filter Module Output Clipping?

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] Half-Band Filter Module Output Clipping?
Date: Wed, 16 Sep 2009 22:07:10 -0700
User-agent: Thunderbird (X11/20090825)

Bruce McGuffin wrote:

Based on the coefficients, we can guarantee that the final sum will have a magnitude which fits in 20 bits, including the sign bit. We can just drop those extra sign bits, since they'll all be the same.

So I'm curious. If the final sum fit into 20 bits, why were the accumulation and
following sum carried out with 24 or 25 bits?


If we changed the coefficients we might need more bits.


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