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This paper deals with an efficient and robust joint control of the step sizes of subband adaptive echo compensation filters and the frequency response of the echo suppression filter of a hands-free telephone system. It is shown that both control methods are described by the same quantity: the ratio of the short-term estimates of the power of the error to the “undisturbed” error signal. Since the latter...
In this paper we present an overview about several approaches for controlling the step size for adaptive echo cancellation filters in hands-free telephones. First an optimal step size is derived. For the determination of this step size the power of a non-measurable signal has to be estimated. Detection and estimation methods for the determination of this power and for the determination of the optimal...
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