Efficient implementation of echo cancellers for ISDN applications

TitleEfficient implementation of echo cancellers for ISDN applications
Publication TypeConference Paper
Year of Publication1989
AuthorsAboulnasr, T., A. Abousaada, and W. Steenaart
Conference NameAcoustics, Speech, and Signal Processing, 1989. ICASSP-89., 1989 International Conference on
Pagination1380 -1383 vol.2
Date Publishedmay.
Keywordsadaptive FIR direct-form echo canceller, adaptive version, digital filters, echo suppression, echo tail canceller, integrated services digital network, interpolated finite impulse response filter, ISDN, ISDN 2B1Q receiver

A computationally efficient echo tail canceller that is an adaptive version of an interpolated finite impulse response filter is proposed. The results obtained with this approach are compared to those obtained with an adaptive FIR direct-form echo canceller. It is shown that the proposed structure is very efficient in estimating the echo tail; it requires significantly fewer multipliers compared to the direct-form adaptive FIR. The proposed structure also maintains the low accuracy required by the direct-form adaptive FIR for the ISDN (integrated services digital network) 2B1Q receiver for most operations and requires only the basic FIR computations


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