Echo Canceller Based on Adaptive Interpolated FIR Filters

"In this paper, the use of adaptive interpolated FIR-LMS structures for echo cancelling in digital telephone systems is assessed. These structures are compared with the widely used FIR-LMS one. By using interpolated structures, it is possible to achieve substantial savings in the required arithmetic for both filtering and tap updating operations. Experimental results show that the interpolated structures also outperform, in terms of residual echo, the traditional FIR structure."