Out in Los Angeles last week, ETRI and NTT were promoting G.711.1 as an HD voice solution in their respective booths at IT EXPO West 2010 (www.itexpo.com).
According to an ETRI flier, G.711.1 provides “better quality at superwideband (50 Hz to 14,000 Hz)” with bit rates from 80 kbps to 96 kbps, with various interoperability modes with baseline G.711 and G.711.1 “wideband” mode. It’s got three modes, 64 kbps, 80 kbps and 96 kbps.
G.711.1 starts with the basic G.711 codec for backwards compatibility, then adds two extra chunks of bits to capture the lower and upper frequencies. If you need to revert to G.711, simply stripping off the two extra bit packets produces narrowband without transcoding overhead. Scaling up to “superwideband” will translate to adding another set or two of bits and moving up to 112 kbps and 128 kbps, using “R2B” and “R3” models.
The codec was jointly developed by ETRI, France Telecom, Huawei, and NTT and VoiceAge, so there should be no big surprise that ETRI and NTT are promoting it.
ETRI had several examples of G.722.1 handsets ranging from desktop handsets to a home WiFi phone. Some of the handsets also incorporate G.722.