I posted the same question on the digital voice mailing lists, and Steve
kindly provided the attached plots from audacity. I opened them
together and flicked back and forth. Above 300Hz, note the smooth roll
off of the ext mic, and the notch in the internal around 1500Hz, typical
for "multipath" channels.
- David
On 24/07/15 08:19, [email protected] wrote:
Did you do any spectral analysis on the audio, there may be some
fan/machine noise which is throwing Codec2 into confusion (even if it's
not readily audible to a human).
If you play a clean recording into both mics (at the same time?), can you
look at the codec2 parameters (ie. fundimental) to see if they are biased.
Maybe even sync recordings and subtract to hear the deltas.
Simon.
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