The design of improved first order ambisonic decoders by the application of range removal and importance in a heuristic search algorithm

David Moore, Jonathan Wakefield

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    This paper presents improvements to previous work on deriving first order Ambisonic decoders for ITU 5.1. The decoders are derived using a heuristic search method with an objective function based upon Gerzon’s metatheory of auditory localisation. An analysis of previously derived decoders shows that they are biased towards particular design objectives due to the nature of the multiobjective function guiding the search. This paper applies a technique called range removal to systematically and logically remove this bias which leads to improved decoder coefficients that better meet all of the objectives. A further technique known as importance is introduced that enables the logical biasing of range-removed objectives. A case study to develop a “max rE” decoder demonstrates this technique in action.
    Original languageEnglish
    Title of host publication31st International Audio Engineering Society Conference
    Subtitle of host publicationNew Directions in High Resolution Audio
    PublisherAudio Engineering Society
    Number of pages7
    ISBN (Print)9781604239805
    Publication statusPublished - 1 Jun 2007


    • audio engineering
    • spatial sound
    • ambisonics
    • high resolution audio

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