George Nychis wrote:
Hi all,
I'm attempting to generate frequency offset in a script that is adding
some channel features:
http://cyprus.cmcl.cs.cmu.edu/matched_filter/gen_noise_samples.py
The frequency offset is specified, for which the original signal is
mixed and then the offset signal is added with the noise.
But I'm not seeing the appropriate frequency offset. If I specify a
frequency offset of 100Hz, I'm only seeing a single point shift, all
other points are the same as if there is no offset:
http://cyprus.cmcl.cs.cmu.edu/matched_filter/graphs/freq_offset.jpg
I'm not sure what you have plotted in that picture. Is that just the
raw samples? Can you write out to a file both the 2 inputs to the mixer
and the 1 output? Then do an FFT on all 3 in octave to make sure the
frequency has really moved as you expected.
Matt
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