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To: rkral who wrote (115921)	3/24/2002 12:49:10 AM
From: pheilman_	Respond to of 152472

Ron, The single sentence that jarred was the following: "AMR increases the capacity by enhancing the voice quality." It does no such thing. It decreases the data rate and matches the voice quality to existing vocoders. The underlying capacity of the channel doesn't change. The use of a half rate encoder allows more slicing of the frame. Which will lead to a reduction in channel capacity due to guard time and sync patterns. There are also some human factor improvements with comfort noise to make the phone connection seem live when no data is being sent. Capacity is an overloaded word in this field. I believe he meant: AMR increases the capacity by enhancing the voice quality of a half rate encoder . OK, GSM has a new vocoder. As you point out, there are no MOS rankings of the various vocoders. It is difficult to tell if the new vocoder will be acceptable to paying customers. Sprint has a long-running ad campaign based on the clarity of their audio, compared to analog at the moment, but I suspect they could generalize. Paul

To: rkral who wrote (115921)	3/24/2002 10:58:27 AM
From: Eric L	Respond to of 152472

Ron, << That is a curious quote from www.uwcc.org. Obviously, a change from full-rate to half-rate cannot quadruple voice capacity. >> The quote from www.uwcc.org (actually 3GAmericas.org which is something less than uwcc.org at this juncture since the only 2 carrier members are Cingular & AWS) is curious ... and unrecognizable to me. << Some other improvement is 'in play' here also. Do you know what it might be? >> You are correct. It is (they are) potentially 'in play'. You might want to listen to Bill Clift in the "3G Americas Launch Webcast" towards the end in the presentation (Seybold comments) and in Q&A: 3gamericas.org ... and look at the press release from Cingular on the Nortel trial in Savannah which didn't use AMR to obtain a 120% capacity increase. - Eric -