Dual mode cellular radio communication apparatus having an echo

Details Dual mode cellular radio communication apparatus having an echo Dual mode cellular radio communication apparatus having an echo

1991-11-27

1993-11-16

Ng, Jin F.

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

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.

Affiliated with

Also associated with

Rating

Dual mode cellular radio communication apparatus having an echo does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dual mode cellular radio communication apparatus having an echo , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dual mode cellular radio communication apparatus having an echo will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-27396