search for: iee04

...codec in inverse, transmitting any random digital data as CELP synthetized voice though any voice transmitter channels (CB radio, GSM voice call, telephone etc.), then converts it back into bytes with low distortion/loss. This is an example: http://info.ee.surrey.ac.uk/Personal/N.Katugampala/pubs/iee04.pdf My first question is that if you have ever tried to make such an application. My second one is that if you authorize me to use the source code of Speex to create such means, and under what licence. The third one, if you can give some initial tips to start with this project. Best regards, Tom

Hi Jean-Marc, yes, problem exists in narrowband-mode, too. I already twiddled with max_gain, but did not have real success. I changed line 337 of ltp.c (function pitch_gain_search_3tap_vq) if (sum>best_sum && gain_sum<=max_gain) { to if (sum>best_sum && gain_sum<max_gain) { -- that stabilizes speex for 2000 Hz and 2200 Hz input on quality setting 7 (23800