Hello,
I think there is a bug in the fir1 function in signal-1.0.11 (and probably
also in 1.1.1 because I don't see significant changes in the code). The
problem is that single-band lowpass filters returned by fir1 don't have a
DC gain of 1. For example:
octave-3.2.4:1> sum(fir1(240,0.01))
ans = 1.1822
That should return 1 (with low-order filters the problem is not so obvious).
Regards
Alberto Cuadrado
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