Echo canceller

Abstract

Abstract A description is given of an echo canceller with an adaptive filter (15). The adaptation rate of the adaptive filter (15) is controlled by a control unit (29), which determines the associated control signal from its input signals (x(k), u(k), e(k)). If the described echo canceller is used, for example, in the speech installation of a telephone network, the adaptation process may only take place if the remote subscriber speaks, and the near subscriber is silent. If such a decision is taken automatically by means of the corresponding signals (x(k), u(k)), a defective decision can substantially reduce the quality of the installation, at least temporarily. <??>For this reason, it is provided to control the adaptation rate of the adaptive filter (15) of the control unit in a sliding manner as a function of suitably selected mean values of three signals (x(k), u(k), e(k)) when the remote subscriber speaks. <IMAGE>

Inventors

• 👤 Wolfgang Brox
• 👤 Peter Dr.-Ing. Vary

Bibliographic Details