Robust and High Gain Acoustic Feedback Compensation in the Frequency DomainWith a Simple Energy-decay Operator

Conference: Speech Communication - 14th ITG Conference
09/29/2021 - 10/01/2021 at online

Proceedings: ITG-Fb. 298: Speech Communication

Pages: 5Language: englishTyp: PDF

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Linhard, Klaus; Gimm, Marco; Schmidt, Gerhard (Digital Signal Processing and System Theory, Kiel University, Kiel, Germany)
Bulling, Philipp (Cerence, Ulm, Germany)

Acoustic feedback compensation in speech applications often suffers from an insufficient adaptation. As a result feedback whistling may be audible and the compensation gain and generally the speech quality is limited. In this work, we introduce the concept of an energy-decay operator and show how to use it for tap-selective step-size control of a multi-delay frequency-domain filter (MDF). Therefore, we derive a so-called “complex sign-sign algorithm” with an inherently included decay operator. Finally, we show robust simulation results with high amplification although the used algorithm shows very low complexity. Possible applications are in-car communication (ICC) systems or other sound reinforcement applications.