ISSN : 1796-2048
Volume : 2    Issue : 2    Date : April 2007

From ITU-T G.722.1 to ITU-T G.722.1 Annex C: A New Low-Complexity 14kHz Bandwidth Audio
Coding Standard
Minjie Xie, Dave Lindbergh, and Peter Chu
Page(s): 65-76
Full Text:
PDF (415 KB)

This paper describes the low-complexity 14kHz bandwidth audio coding algorithm which has been
recently standardized by ITU-T as Recommendation G.722.1 Annex C (“G.722.1C”). The algorithm is
an extension to ITU-T Recommendation G.722.1 and a doubled form of the G.722.1 algorithm to
permit 14 kHz audio bandwidth using a 32 kHz audio sample rate, at 24, 32, and 48 kbit/s. The G.
722.1C codec features very high audio quality, extremely low computational complexity, and low
algorithmic delay compared to other state-of-the-art audio coding algorithms. This codec is suitable
for use in video conferencing and teleconferencing, and Internet streaming applications as well as a
general-purpose 14 kHz audio codec. Subjective test results from the Characterization phase of G
722.1C are also presented in the paper.

Index Terms
Audio coding, low complexity, superwideband, transform coding