> Hello Lists, > > Codec 2 has some sensitivity to speech from different sources. I'm > looking into this. > > I have attached two samples, one from my laptops internal microphone, > one from a headset. The ext sample sounds better when coded by Codec 2. > > 1/ Can some one tell me why internal microphones sound worse?
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). Magma displacement! https://www.youtube.com/watch?v=y7g6dKncO-I I also remember a while ago there was mention of a review of different digital codecs, and how they were affected by background noise. Especially wrt emergency responders not being able to hear messages. > > 2/ Is there anything that can be done to make the internal microphone > signal "OK" - or is information lost for ever? Pre-filtering? ie. high-pass Cheers, Simon ------------------------------------------------------------------------------ _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
