Publications – Details
Estimation of Bandwidth Extension Parameters in ITU-T G.729.1
- Authors:
- Bernd Geiser and Peter Vary
- Book Title:
- Proceedings of ETSI Workshop on Speech and Noise in Wideband Communication
- Venue:
- Sophia Antipolis, France
- Date:
- May 2007
- Language:
- English
Abstract
We discuss a potential extension of the recently standardized ITU-T G.729.1 speech and audio codec. The G.729.1 coder is hierarchically organized, i.e., the obtained quality increases with the amount of bits that is received for each frame. In particular, the bit rates of 8 and 12 kbit/s offer narrowband (50 Hz - 4 kHz) speech transmission. With a received bit rate of at least 14 kbit/s, the output bandwidth is increased to the wideband frequency range (50 Hz - 7 kHz). Here, we have investigated efficient estimation methods to provide this enhanced bandwidth already for the lower bit rates while maintaining full interoperability with the standard implementation of G.729.1. We note that the proposed technique is not necessarily limited to this specific codec and may also serve in other applications.
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