A phase vocoder driven bandwidth extension method with novel transient handling for audio codecs
Nagel F, Disch S, Rettelbach N (2009)
Publication Type: Conference contribution
Publication year: 2009
Book Volume: 2
Pages Range: 1024-1031
Conference Proceedings Title: 126th Audio Engineering Society Convention 2009
Event location: DEU
ISBN: 9781615671663
Abstract
Storage or transmission of audio signals is often subject to strict bitrate constraints. This is accommodated by audio encoders that encode the lower frequency part in a waveform preserving way and approximate the high frequency signal from the lower frequency data by using a set of reconstruction parameters. This so called bandwidth extension can lead to roughness and other unpleasant auditory sensations. In this paper, the origin of these artifacts is identified and an improved bandwidth extension method called harmonic bandwidth extension (HBE) is outlined, avoiding auditory roughness in the reconstructed audio signal. Since HBE is based on phase vocoders, and thus intrinsically not well suited for transient signals, an enhancement of the method by a novel transient handling approach is presented. A listening test demonstrates the advantage of the proposed method over a simple phase vocoder approach.
Authors with CRIS profile
Involved external institutions
Fraunhofer-Institut für Integrierte Schaltungen (IIS)
Germany (DE)
Gottfried Wilhelm Leibniz Universität Hannover
Germany (DE)
Germany (DE)
Gottfried Wilhelm Leibniz Universität Hannover
Germany (DE)
How to cite
APA:
Nagel, F., Disch, S., & Rettelbach, N. (2009). A phase vocoder driven bandwidth extension method with novel transient handling for audio codecs. In 126th Audio Engineering Society Convention 2009 (pp. 1024-1031). DEU.
MLA:
Nagel, Frederik, Sascha Disch, and Nikolaus Rettelbach. "A phase vocoder driven bandwidth extension method with novel transient handling for audio codecs." Proceedings of the 126th Audio Engineering Society Convention 2009, DEU 2009. 1024-1031.
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