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A Real-Time System for Voice over IP Using the Adaptive Multi-Rate Speech Coder

Authors:

Frank Mertz, Rainer Martin, Benoit Bossu, Tim Fingscheidt, and Tobias Färber

Book Title:

Proceedings of Aachen Symposium on Signal Theory

Venue:

Aachen, Germany

Date:

Sept. 2001

Language:

English

Abstract

The transmission of coded speech over packet-switched networks, such as the Internet, has to deal with packet loss and packet delays, not occurring in the traditional circuit-switched speech transmission. In this contribution we present packet-switched transmission methods for speech frames encoded by the Adaptive Multi-Rate (AMR) speech coder, a state-of-the-art coding scheme that provides different switchable bit rates. By explicitly adding redundancy to the transmitted data packets we achieve a high degree of robustness with respect to frame erasures. The results we present were obtained by our real-time Voice over IP transmission system which are also described in this paper.

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