A Psychoacoustic-Based Analysis of the Impact of Pre-Echoes and Post-Echoes in Soundfield Rendering Applications

Conference: IWAENC 2012 - International Workshop on Acoustic Signal Enhancement
09/04/2012 - 09/06/2012 at Aachen, Germany

Proceedings: IWAENC 2012

Pages: 4Language: englishTyp: PDF

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Bianchi, L.; Antonacci, F.; Canclini, A.; Sarti, A.; Tubaro, S. (Dipartimento di Elettronica ed Informazione, Politecnico di Milano, Piazza Leonardo da Vinci, 32, 20133 Milano, Italy)

In this paper we propose two metrics for the evaluation of the impact of pre-echoes and post-echoes on the perceived quality in soundfield rendering applications. These metrics are derived from psychoacoustic-based considerations, in particular the masking effect, well known in the literature of perceptual coding. The measurement is accomplished through a virtual microphone array that samples the soundfield on a circumference. The soundfield within the circle is estimated by means of the circular harmonic decomposition. As a result, space-time impulse responses of the rendering system are obtained, which are then analyzed through the masking curve to extract the pre- and post-echoes metrics. A comparison between experimental and simulative results, conducted using the same setup, allows to discriminate the impact of the adopted rendering engine and of the non-idealities of the real system (environment and loudspeakers) on pre- and post-echoes. Index Terms — Loudspeaker array, Circular Harmonic Decomposition, Pre-echoes, Post-echoes