NatureDSP Line Echo Canceller (LEC) – software product for adaptive echo cancellation for telephone circuits. NatureDSP LEC uses modern powerful IPNLMS algorithm which provides the fastest convergence time and intelligent behavior under double-talk conditions. Canceller especially designed for working with non-linear hybrids providing significant ERLE improvement. Adaptive non-linear processing (NLP) scheme eliminates residual echo without speech degradation. Highly optimized under ARMv5 and ARMv7 cores.