This paper discusses a real-time implementation of an adaptive acoustic echo canceler for a hands-free cellular (mobile) phone operating inside a car. A 512-tap adaptive-finite-impulse-response (AFIR) filter, which is the implementation of the adaptive least-mean-square (LMS) algorithm with tapped-delay-line (TDL) structure, is utilized for the acoustic echo canceller. A simple double-talk detection algorithm and the normalized convergence parameter for the LMS algorithm are discussed and implemented on the DSP56001, which is also used as a host processor for the DSP56200s, A/D and D/A converters. DSP56001 assembly codes are included as well as experimental results and the schematic diagram for the hardware implementation.


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    Title :

    Acoustic-Echo Canceller for a Full-Duplex Hands-Free Mobile Phone


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    International Congress & Exposition ; 1991



    Publication date :

    1991-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Acoustic-echo canceller for a full-duplex hands-free mobile phone

    Park,S. / Motorola,Digital Signal Processing Operations,US | Automotive engineering | 1991



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