A dsp-based lattice-pole-zero acoustic echo canceller

摘要

In this paper, a practical pole-zero lattice adaptive acoustic echo canceller (AEC) fro hands-free telephone is proposed. The proposed algorithm consists in two parts: forward lattice and inverse lattice. Collectively, they are referred to as LATIN (Lattice and Inverse Lattice) configuration. While the forward Lattice is responsible for acoustic echo cancellation, the inverse lattice is employed in the double-talk (DT) Mode only as to undo the distortion of the near-end speech brought about by the forward lattice filter When suppressing the acoustic echo.