Telephonic communications – Subscriber line or transmission line interface – Protective circuit
Patent
1995-08-15
1997-08-26
Zele, Krista M.
Telephonic communications
Subscriber line or transmission line interface
Protective circuit
379408, 379410, 379411, 370290, H04M 900, H04B 323
Patent
active
056617950
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
REFERENCES:
patent: 5278900 (1994-01-01), Van Gerwen et al.
patent: 5289539 (1994-02-01), Maruyama
patent: 5428605 (1995-06-01), Andre
patent: 5463618 (1995-10-01), Furukawa et al.
Maioli Jay H.
Saint-Surin Jacques M.
Sony Corporation
Zele Krista M.
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