Finite-precision design and implementation of all-pass polyphase networks for echo cancellation in sub-bands

Tanrikulu, Oguz; Baykal, Buyurman; Constantinides, A.G.; Chambers, Jonathon; Naylor, P.A.

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Finite-precision design and implementation of all-pass polyphase networks for echo cancellation in sub-bands

conference contribution

posted on 2010-01-26, 15:09 authored by Oguz Tanrikulu, Buyurman Baykal, A.G. Constantinides, Jonathon Chambers, P.A. Naylor

All-pass polyphase networks (APN) are particularly attractive for acoustical echo cancellation (AEC) arranged in sub-bands. They provide lower inter-band aliasing, delay and computational complexity than their FIR counterparts. Moreover, APNs achieve higher echo return loss enhancement (ERLE) performance and faster convergence than full-band processing. In the paper, the finite precision implementation of APNs is addressed. A procedure is presented for re-optimising the all-pass coefficients of the prototype low-pass filter for finite precision operation. Robust finite precision implementation of a prototype low-pass filter is discussed. The results of a set of AEC experiments are reported with full and 16-bit precision implementation

History

School

Mechanical, Electrical and Manufacturing Engineering

Citation

TANRIKULU, O. ... et al, 1995. Finite-precision design and implementation of all-pass polyphase networks for echo cancellation in sub-bands. IN: IEEE International Conference on Acoustics, Speech, and Signal Processing, 9-12 May, Volume 5, pp. 3039 - 3042

Publisher

Version

VoR (Version of Record)

Publication date

1995

Notes

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