Dual mode cellular radio communication apparatus having an echo

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network

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379390, 379411, H04M 1100, H04M 100

Patent

active

052630790

ABSTRACT:
A dual mode cellular radio communication apparatus includes an echo canceller which cancels echo signals caused by acoustic coupling between a hands-free microphone and a loudspeaker in both analog mode and digital modes. An analog-to-digital converter and digital-to-analog converter may be used both in an analog mode and in a digital mode. A second analog-to-digital converter and a second digital-to-analog converter may be selectively used in the analog or digital mode. The echo canceller may be rendered inoperative during hand-set operation. In addition, a bypass circuit may be provided between an input and an output of the echo canceller so that the echo canceller is bypassed.

REFERENCES:
patent: 4605826 (1986-08-01), Karemasa
patent: 4629829 (1986-12-01), Puhl et al.
patent: 4636586 (1987-01-01), Schiff
patent: 5014294 (1991-05-01), Kromeraker et al.

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