Steve Underwood wrote: > Kevin P. Fleming wrote: > >> Steve Underwood wrote: >> >> >> >>> Good engineering of standards is about building them for the future. >>> Cutting off the bass at 70Hz is far less of a limitation than cutting >>> off the high end at 11kHz, but why do it in the codec? Why not leave the >>> transducers and their amps to do what they can? >>> >>> >> Along those lines, I've mentioned here before that my wideband Polycom >> IP650 actually sounds substantially better with G.711 ulaw media streams >> than any previous phone I've had, and I've had high quality phones >> before. I can only assume this is due to the higher quality speakers, >> amps, microphones, and acoustic effects of the phone design. >> >> > They might be doing some kind of fake bandwidth expansion. You can't > create something out of nothing, and make the narrowband voice more > intelligible, but you can make it sound pretty nice. Jean-Marc Valin (he > of speex fame) has a very impressive expander he is working on at the > moment. > Someone tells me Polycom definitely do some form of bandwidth expansion, though its a lot less realistic than Jean-Marc technique.
Steve _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
