Resampling, filters, and CPU Usage

As most of you likely have seen, I’ve been working on a flowhraph for
some time. Using gr-drm and an external FM processor, I have made a sort
open alternative to HD Radio…because fun.

Anyway, the DRM signals are sampled at 48khz and the FM portion at 192.
remainder of the graph is 384k due to filters. 2 bandpass filters, 4
reject filters.

To help you help me, I have uploaded the flow graph to Google Drive. It
require gr-drm and for your audio to be set to Jack. (Or just use null
sinks).I’m still rather new to GNURadio so…I’m sure there’s some
mistakes in there:

IBOC.grc -

gr-drm -

Stereo Tool (FM processor) -

So, what is it supposed to do?

Two DRM signals are to sit on the outside of the FM envelope. There
only be two, but as they are interpolated, they make a mess and that’s
I put the filters there.

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