Considering high-resolution, multi-channel audio, it is worth re-examining the concept of psychoacoustically optimized noise shaping to ensure that signal quality is preserved when word-lengths are reduced. In this paper, approaches in static (time-invariant) and signal-adaptive (time-variant) noise shaping are discussed. We identify problems occurring when equal-loudness level contours such as the inverse F-weighting curve are used as a model for noise shaping. As a remedy, we present two alternative time-invariant filter designs. Regarding adaptive requantization, we introduce a noise shaper based on work by Verhelst and De Koning with an improved design of the time-variant filter. The paper concludes with a comparative evaluation based on listening tests with different transducers.

Authors: Helmrich, Christian R.; Holters, Martin; Zölzer, Udo
Affiliations: Helmut Schmidt University, Hamburg; Technical University of Hamburg-Harburg(See document for exact affiliation information.)
AES Conference: 31st International Conference: New Directions in High Resolution Audio (June 2007)
Paper Number: 27
Publication Date: June 1, 2007 Import into BibTeX
Subject: High Resolution Audio
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=13963

Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $33 for non-members and is free for AES members and E-Library subscribers.

Learn more about the AES E-Library

E-Library Location: (CD 31stPapers)   /31/aes31-000058.pdf

Start a discussion about this paper!