Self adaption echo cancellation method for digital hearing aid

The invention provides a self adaption cancellation offset method for a digital hearing aid. The self adaption cancellation offset method for the digital hearing aid is an NBLMS (normalized and blocked least mean square)_M-K algorithm. The self adaption cancellation offset method for the digital hearing aid includes: updating K filter tap coefficients in front of each signal point when each signal point arrives in an M cycle, and updating all filter coefficients when the Mth signal point enters a system. The self adaption cancellation offset method for the digital hearing aid not only reduces complexity of the algorithm, but also guarantees that voices after being processed are high in intelligibility and intelligibility, and meets small size and low power dissipation demands for the digital hearing aid.