On Wed, Oct 10, 2007 at 04:54:10PM -0400, address@hidden wrote:
Well, this seems logical, and if so then we've finally stumbled on the
point of the matter. So what's the fix? Is it a simple matter of
extending the "definitions" to other decimations in the file Brian cites?
thanks Brian and Eric,
eric
Also- this fix you are proposing- is it a simple scaling of gain that
would be independent of decimation? Because as you can see from the
following figure, the amplitudes scale directly with the decimation for
values above 128 on the 4 rcv rbf.
www.nd.edu/~ematlis/z.gnuradio/Amplitude_vs_decimation.jpg
Both rbf's produce a flat response below 128 decimation; greater than this
is where the change occurs. The standard half-band rbf does have a couple
of dips but is basically flat.
OK. In the interest of expediency, use the decimation values that
work, then complete the decimation in the host. The reason that
there's a version that DOESN'T have the halfband is to save space.
Making anything bigger (e.g., width of CIC) is contraindicated ;)
Eric