The 29th AES Conference, "Audio for Mobile and Handheld Devices", all digital, September 2 to 4, 2006 Seoul National, lUniversity Campus
Digital Audio Presentations - Part 8
A Fast Quantifying Loop Algorithm for MP3/AAC Encoders
Hyen-O Oh, Hyo Jin Kim and Seung Jong Choi, LG Electronics, Korea,
Young-Cheol Park, Yonsei University, Korea
A fast quantifying loop algorithm for low power implementations of MP3/AAC digital encoder is proposed. The proposed algorithm exploits the empirically-driven linear relationship of quantizer parameters, and it can reduce dramatically the maximum number of iterations needed in quantification. The resulting MP3/AAC digital encoder can be implemented in real time with a power-limited system.
Hands-Free Digital Audio and Its Application to Telecommunication Terminals
Martin Schönle, Christophe Beaugeant and Kai Steinert, Siemens AG, Germany
Heinrich W. Loellmann, Bastian Sauert and Peter Vary, 2RWTH Aachen University, Germany
In this paper we focus on the enhancement of speech quality by digital hands-free audio systems in modern, multimedia enabled telecommunication terminals. Requirements like the compatibility with wideband digital audio and full-duplex hands-free operation demand for sophisticated system designs. As a starting point we introduce a state-of-the-art system developed for mobile phones, considering practical aspects of algorithm design. Algorithmic extensions to this solution are presented, supporting digital speech enhancement for the user of the terminal or reducing the round-trip delay. In addition, more advanced concepts are discussed. They offer the capability of joint design for the most important algorithms and provide the possibility to exploit psycho-acoustic properties of the human ear.