AUDIO PEAK REDUCTION USING A SYNCED ALLPASS FILTER

Schlecht SJ, Fierro L, Välimäki V, Backman J (2022)

Publication Type: Conference contribution

Publication year: 2022

Journal

2013 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

Publisher: Institute of Electrical and Electronics Engineers Inc.

Book Volume: 2022-May

Pages Range: 1006-1010

Conference Proceedings Title: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings

Event location: Virtual, Online, SGP

ISBN: 9781665405409

DOI: 10.1109/ICASSP43922.2022.9747877

Abstract

Peak reduction is a common step used in audio playback chains to increase the loudness of a sound. The distortion introduced by a conventional nonlinear compressor can be avoided with the use of an allpass filter, which provides peak reduction by acting on the signal phase. This way, the signal energy around a waveform peak can be smeared while maintaining the total energy of the signal. In this paper, a new technique for linear peak amplitude reduction is proposed based on a Schroeder allpass filter, whose delay line and gain parameters are synced to match peaks of the signal's autocorrelation function. The proposed method is compared with a previous search method and is shown to be often superior. An evaluation conducted over a variety of test signals indicates that the achieved peak reduction spans from 0 to 5 dB depending on the input waveform. The proposed method is widely applicable to real-time sound reproduction with a minimal computational processing budget.

Authors with CRIS profile

Sebastian Schlecht

Involved external institutions

Aalto University Espoo FI Finland (FI) AAC Technologies Solutions Finland Oy FI Finland (FI)

How to cite

APA:

Schlecht, S.J., Fierro, L., Välimäki, V., & Backman, J. (2022). AUDIO PEAK REDUCTION USING A SYNCED ALLPASS FILTER. In ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings (pp. 1006-1010). Virtual, Online, SGP: Institute of Electrical and Electronics Engineers Inc..

MLA:

Schlecht, Sebastian J., et al. "AUDIO PEAK REDUCTION USING A SYNCED ALLPASS FILTER." Proceedings of the 47th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2022, Virtual, Online, SGP Institute of Electrical and Electronics Engineers Inc., 2022. 1006-1010.

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