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[Discuss-gnuradio] GRC filter tap evaluations - difference between curre

From: Richard Clarke
Subject: [Discuss-gnuradio] GRC filter tap evaluations - difference between current version and v 0.7
Date: Wed, 22 Apr 2009 10:15:53 +1200

Hi All,

With version 0.7 of GRC I could enter the taps of a filter in the following format [-23, 4, 245, 1235, 245, 4, -23]/32768 in the relevant GRC block window  (taps field) and GRC would do the division calculation for each tap, i.e the tap vector automatically became [-7.019e-4,1.22e-4, 7.47e-3, 3.76e-2, 7.47e-3, 1.22e-4, -7.019e-4].

Trying to do the same thing in the current version of GRC that is included with GNU Radio 3.2rc2 results in a warning message that the tap vector cannot be evaluated. Does anyone know how to achieve the same thing as demonstrated above for version 0.7?
A small thing I know but most coefficients of filters that I have come as fixed point 16 bit integers (-32768<=coeff<=32767) and doing a copy/paste is more convenient than doing the extra calculation and then formatting the resultant floating point vector into a copy and pasteable form for entry into the GRC blocks.

Thanks very much.


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