Hi all, as not all you know, not all Nokia S60 devices support AMR's encoding with VAD features and some of them does not support it in proper way. It could be nice whether we could arrange a distributed testing activity with a sample application that test the AMR VAD behaviour, in order to create a knowledge base on device UID that works properly and devices that does not work properly where VAD must be disabled. Fabio

hi, I have this problem in my app, and even when the VAD does work, it doesn't do good job on noisy enviroment. It would be nice feature to have VAD support on pjsip to reduce bandwidth and help with voice quality. I am using AMR vocoder with VAS and on reception of compressed AMR frame i decode it back to PCM, compute the energy and make decision based on the energy. not so sofisticate VAD algo but works fine. nir On Tue, Jul 28, 2009 at 11:55 AM, Fabio Pietrosanti (naif) < lists@infosecurity.ch> wrote: > Hi all, > > as not all you know, not all Nokia S60 devices support AMR's encoding with > VAD features and some of them does not support it in proper way. > > It could be nice whether we could arrange a distributed testing activity > with a sample application that test the AMR VAD behaviour, in order to > create a knowledge base on device UID that works properly and devices that > does not work properly where VAD must be disabled. > > Fabio > > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip@lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > -- ניר אלקיים טל: 050-3930056 nir.elkayam@gmail.com

nir elkayam wrote: > hi, > > I have this problem in my app, and even when the VAD does work, it > doesn't do good job on noisy enviroment. > > It would be nice feature to have VAD support on pjsip to reduce > bandwidth and help with voice quality. > > I am using AMR vocoder with VAS and on reception of compressed AMR > frame i decode it back to PCM, compute the energy and make decision > based on the energy. not so sofisticate VAD algo but works fine. Please tell me more about your approach. You do not like the AMR VAD approach generating Full sample, Confort Noise Sample and Silence Descriptor? I am using it over GSM CSD (with http://privategsm.com) with APS and it works fine, even if on some device it does not work as the VAD is not properly supported. Fabio