Generating chrip signals


#1

Hi

At the moment I would like to see if I can generate a chirp signal.
Looking through what gnuradio blocks are available, I assumed I could
use the gr_fxpt_nco block to do something like this. I was wondering
firstly if it would be possible, and secondly, how this block works and
behaves when it’s running.

Regards

Lance


#2

On Wed, Apr 19, 2006 at 03:44:27AM -0700, seph 004 wrote:

Hi

At the moment I would like to see if I can generate a chirp
signal. Looking through what gnuradio blocks are available, I
assumed I could use the gr_fxpt_nco block to do something like
this. I was wondering firstly if it would be possible, and
secondly, how this block works and behaves when it’s running.

Regards
Lance

gr_fxpt_nco doesn’t derive from gr_block. It’s a low level primitive
used within blocks.

However, you could generate a chirp by feeding
gr.frequency_modulator_fc (basically a VCO) a periodic ramp.

You could generate a periodic ramp using gr.vector_source_f(foo, True)
where foo was a python sequence that defines the ramp.

You could of course also build a new block that derives from
gr_sync_block.

Eric