Postfiltering in Adaptive Feedback Cancellation for PA Systems

Title

Postfiltering in Adaptive Feedback Cancellation for PA Systems

 Author

Weustink, C.A. (TU Delft Electrical Engineering, Mathematics and Computer Science)
de Vries, J.W. (TU Delft Electrical Engineering, Mathematics and Computer Science)

Contributor

Hendriks, R.C. (mentor)
Martinez Castaneda, J.A. (mentor)
Schmitz, J.E.J. (graduation committee)
Izadkhast, S. (graduation committee)
Çalış, M. (graduation committee)

Degree granting institution

Delft University of Technology

 Date

2020-07-02

 Abstract

The most promising method for acoustic feedback control in public address systems is adaptive feedback cancellation (AFC). This approach is based on making an estimation of the room impulse response, which is used to subtract an estimate of the feedback from the microphone signal. A postfilter is often used to improve the performance of such an AFC system by reducing residual feedback or increasing stability. The postfilter implemented in this thesis focuses on the latter. It consists of two modules: howling detection and howling suppression. The final design makes use of the peak to harmonic power ratio criterion (PHPR) and second order digital Butterworth notch filter respectively. Simulation measurements show a successful suppression of howling as long as the loudspeaker signal does not
get saturated.

 Subject

Feedback Control
Adaptive control
Filtering
Acoustic Feedback Cancellation

 To reference this document use:

http://resolver.tudelft.nl/uuid:27f47c73-329c-4ead-9122-7f0a59cc4934

 Part of collection

Student theses

 Document type

bachelor thesis

 Rights

© 2020 C.A. Weustink, J.W. de Vries
Files
PDF BAP_J_Postfiltering_Final.pdf 3.3 MB
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