Stereophonic acoustic echo canceller without pre-processing

This paper proposes a stereophonic acoustic echo canceller without pre-processing which can identify the correct echopaths. By dividing the filter coefficients into two portions and update one part at a time, the filter coefficient have an unique solution. Convergence analysis clarifies the condition for correct echo-path identification. For fast convergence and stable adaptation, a convergence detection and an adaptive step-size are also introduced. The modification amount of the filter coefficients detects the convergence and also determines the step-size. Computer simulations show 10dB smaller coefficient error than those of the conventional algorithms.