Adaptive filter including controlled tap gain coefficient drift

Abstract

Abstract In adaptive filters, under certain incoming signal conditions the tap gain coefficients tend to drift toward relatively large values. This condition has been countered by taking so-called leakage into account in generating the tap gain coefficients. Introduction of leakage tends to drive the tap gains toward zero and is desirable under certain incoming signal conditions and not others. Indeed, during intervals that concentrated partial or narrow band energy, e.g., single frequency tones, multifrequency tones and the like, is incoming to the filter there is a need to introduce a relatively large leakage value into the tap gain coefficients. However, during intervals when whole or wide band energy, e.g., speech or noise, is incoming to the filter no leakage is desired or needed. This is realized by detecting intervals during which partial band energy is incoming to the filter and controllably increasing the leakage value during those intervals only.

Inventors

• 👤 Charles William Kevin Gritton

Bibliographic Details