Publications – Details
Joint Pre-Echo Control and Frame Erasure Concealment for VoIP Audio Codecs
- Authors:
- Bernd Geiser and Peter Vary
- Book Title:
- Proceedings of European Signal Processing Conference (EUSIPCO)
- Venue:
- Glasgow, Scotland
- Organization:
- EURASIP
- Date:
- Aug. 2009
- Pages:
- 1259–1263
- Language:
- English
Abstract
Pre-echo artifacts are a common problem of transform audio codecs owing to their comparatively large block lengths. If such codecs are used in Voice-Over-IP (VoIP) applications, the concealment of lost audio packets poses another major issue. These two problems are usually solved by two separate algorithmic components: A mechanism for pre-echo control (PEC) and a frame erasure concealment (FEC) algorithm. In this contribution we propose a combined PEC/FEC approach which elegantly solves both problems based on a single side information stream. In particular, our proposal is suitable for (subband) transform audio codecs that are based on a frequency transform with half-overlapped windowing (such as the popular MDCT). The described method is part of the Huawei/ETRI candidate for the future ITU-T superwideband extensions of Rec. G.729.1 and G.718, where it has been successfully applied in the context of high frequency (8-14 kHz) encoding.
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