The odd thing is that the glitches in Iain's recording appear to occur
a cycle or two before a frequency shift. It almost appears to be due
to an improperly windowed FIR filter, but it could be caused by
anything else...
If you have an audio editing program, you can see the envelope
glitches quite clearly in Iain's wav file. There is one at 2.9235
seconds into the recording, and another at 3.253 seconds into the
recording, for example. You can see the frequency shift about 2 or 3
msec following those glitches.
73
Chen, W7AY
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