%0 Conference Paper %A Tanrikulu, Oguz %A Baykal, Buyurman %A Constantinides, A.G. %A Chambers, Jonathon %A Naylor, P.A. %D 2010 %T Finite-precision design and implementation of all-pass polyphase networks for echo cancellation in sub-bands %U https://repository.lboro.ac.uk/articles/conference_contribution/Finite-precision_design_and_implementation_of_all-pass_polyphase_networks_for_echo_cancellation_in_sub-bands/9550052 %2 https://repository.lboro.ac.uk/ndownloader/files/17181101 %K IIR filters %K Acoustic signal processing %K All-pass filters %K Antialiasing %K Computational complexity %K Convergence of numerical methods %K Delays %K Digital filters %K Echo suppression %K Low-pass filters %K Mechanical Engineering not elsewhere classified %X 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 %I Loughborough University