You may already have done this but you may not. Have you ever pumped different colours of noise[1] through the codec and evaluated what it does?
https://en.m.wikipedia.org/wiki/Colors_of_noise -- finger painting on glass is an inexact art - apologies for any errors in this scra^Hibble ()/)/)() ..ASCII for Onno.. On 24 Jul 2015 08:32, "David Rowe" <[email protected]> wrote: > 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. >> >> >> >> ------------------------------------------------------------------------------ >> _______________________________________________ >> Freetel-codec2 mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/freetel-codec2 >> >> > > ------------------------------------------------------------------------------ > > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > >
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