Echo path transition detection

Details Echo path transition detection Echo path transition detection

1991-03-11

1993-08-17

Kuntz, Curtis

Multiplex communications

Wide area network

Packet switching

379406, 379410, 379411, H04J 300, H04M 900

Patent

active

052375625

ABSTRACT:
A method for detecting a transition of an echo path used for an estimation of the transfer function of a system by using an adaptive filter, from an echo caused by a signal transmitted through an input terminal of the system at which the response of the transmitted signal is received. The method includes the steps of calculating the amount of the whole or the first delay portion of an impulse response of the system, calculating the amount of the remaining delay portion of the impulse response of the system, calculating the ratio between the amount of the whole or the first delay portion of the impulse response and the amount of the remaining delay portion of the impulse response, and deciding an occurrence of a transition of the characteristics of the system based on the calculated ratio. The transition of the characteristics of the system is discriminated from a hindering signal produced in the system in the decision making process.

REFERENCES:
patent: 3821493 (1974-06-01), Chiba
patent: 4562312 (1985-12-01), Duttweiler
patent: 4571465 (1986-02-01), Brie et al.
patent: 4633046 (1986-12-01), Kitayama et al.
patent: 5042026 (1991-08-01), Koike et al.

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