A process for the reduction in acoustic feedback and acoustic echoes with hands-free telephone networks

摘要

A process for the reduction in acoustic feedback and acoustic echoes in telephone networks with hands-free facilities, for example, with the use of frls - algorithms, which are implemented in an adaptive echo compensator, characterized in that, in the joint - process of the frls - algorithms with an unchanged prediction part of a in the estimate of the echo path h * (k) permanently acting control factor α (k) is inserted, the constant adaptability of the frls - algorithms has the effect that, with an increase of the ratio between the useful-signal power and interference signal power in the microphone channel, the value of the control factor α (k) is greater and greater adaptability, so that the value of the estimated echo signal used for echo compensation is always the value of the microphone channel is adapted to the interference signal, and that with the reduction of the ratio between the useful-signal power and interference signal power in the microphone channel of the value of the control factor α (k) is smaller, and thus a lower adaptability is caused, so that the estimated echo signal used for echo compensation by means of a generated strong interference in the microphone channel is no longer is considerably corrupted, and that thus the compensation of the in the microphone channel..