In a repeated quantization scenario, apart from the nominal quantization error, an additional tandem error is introduced. The amount of the excess tandem error depends on the characteristics of the quantizers used. In this work, the effect of tandem error and its dependence on the underlying quantizer characteristics are analyzed. A prime example where tandem error leads to increased noise is in audio transcoding. The behavior of tandem-noise for typical audio coding methods such as MPEG 1 Layer 2 is investigated. A method of reducing the tandem errors is proposed. This method involves guiding the quantization process of the first quantizer, assuming prior knowledge of the second quantizer. Results show that the method is able to reduce the amount of tandem error in the repeated quantization scenario.

Authors: Lee, Jun Wei; Lemma, Aweke; van der Veen, Michiel
Affiliations: Dept of Electrical and Computer Engineering, National University of Singapore, Singapore ; Digital Systems Labs, Royal Philips Electronics, Eindhoven, Netherlands ; Philips Research, Royal Philips Electronics, Eindhoven, Netherlands(See document for exact affiliation information.)
AES Convention: 117 (October 2004) Paper Number: 6198
Publication Date: October 1, 2004 Import into BibTeX
Subject: Lossy and Lossless Audio Coding
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=12855

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