Yes, maybe cheap microphone device we used couldn't work well at 44k. regards, Gang 2009/3/27 Benny Prijono <bennylp at teluu.com> > 2009/3/27 Gang Liu <gangban.lau at gmail.com> > >> We used a CMedia USB device as audio input device when we did resample >> test before. >> >> MP3 player ---- line connect -- > USB --- 44khz ---> pjmedia app(the same >> code as I published at google code) >> >> ---> PCMU stream ---> remote >> >> All at local LAN. >> We used wireshark to capture G.711 stream. >> And then compare this file again the orignal file and the 8khz file >> converted by audacity. >> It seems some high frequency was cut by pjmedia resampling. the quality >> not good as audacity resampling. If change to 8khz, don't do resample >> anymore, audio signal showed by audacity was OK. Also we tried Realtek >> HD audio input of dell desktop pc. >> >> > > As I understand it, G.711 is not really a lossless compression codec, so > some signal will be lost. Also the above involves analog connectivity too. > So it's not a fair comparison IMO. > > For apple to apple comparison of the resample, use wav to wav resampling > using pjsua method like I posted previously. > > cheers > Benny > > > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20090402/c3729d4e/attachment.html>
