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Abstract

An adaptive signal processing device employed in a hand-portable telephone configured to adaptively estimate signal transfer characteristics in a transmission system and process signals based upon such estimation includes a power calculating unit, a filter coefficient updating unit, an arithmetic-logical unit and an echo removing unit. The power calculating unit calculates the power of a first input signal x(n) entering the device via a transmission system. The filter coefficient updating unit calculates a filter coefficient h(n+1)(i) updated at time n+1 based upon the first input signal x(n), a signal e(n) corresponding to a second input signal d(n) to be transmitted over the transmission system less a pseudo-echo component, a signal 2.sup.Pe outputted by the power calculating unit, a control constant a and a filter coefficient h(n)(i) at time n, in accordance with an equation h.sub.(n+1) (i)=h.sub.(n) (i)+.alpha.(e(n).times.(n-i))2.sup.Pe A convolution unit performs convolution on the first input signal x(n) using filter coefficients from the filter coefficient updating unit, while an echo removing unit removes echo components contained in the second input signal d(n) by an output signal of the convolution unit.

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