Echo suppression with both digital and analog variable attenuato

Details Echo suppression with both digital and analog variable attenuato Echo suppression with both digital and analog variable attenuato

1990-09-27

1991-12-24

Williams, Howard L.

Coded data generation or conversion

Analog to digital conversion followed by digital to analog...

341139, 370 321, 379390, 379409, H03M 106, H04M 908

Patent

active

050756877

ABSTRACT:
An apparatus for effecting echo suppression facilitating communications between an analog device and a digital device comprising a transmit circuit for processing outgoing signals, a receive circuit for processing incoming signals, and a control circuit for controlling the transmit circuit and the receive circuit. The transmit circuit includes transmit attenuators for attenuating the outgoing signals as they pass through the transmit circuit, and an analog-to-digital conversion circuit for converting analog signals to digital signals. The receive circuit includes receive attenuators for attenuating the incoming signals as they pass through the receive circuit and a digital-to-analog conversion circuit for converting digital signals to analog signals. Each of the transmit attenuators and the receive attenuators is digitally adjustable by the control circuit. The control circuit receives sensed outgoing signals from the transmit circuit and sensed incoming signals from the receive circuit and effects a comparison of the sensed outgoing and incoming signals to determine whether the apparatus is transmitting or receiving. The control circuit digitally adjusts the transmit attenuators and the receive attenuators to distribute a predetermined maximum loss among incoming signals and outgoing signals appropriately to increase signal attenuation in the receive circuit and reduce signal attenuation in the transmit circuit when the apparatus is transmitting, and to increase signal attenuation in the transmit circuit and decrease signal attenuation in the receive circuit when the apparatus is receiving.

REFERENCES:
patent: 4088851 (1978-05-01), Gupta et al.
patent: 4123626 (1978-10-01), Munter
patent: 4600815 (1986-07-01), Horna
patent: 4629829 (1986-11-01), Puhl et al.
patent: 4764954 (1988-08-01), Tsurusaki et al.
patent: 4965822 (1990-10-01), Williams
patent: 4979163 (1990-12-01), Erving et al.
patent: 4982427 (1991-01-01), Nicolai
patent: 4984265 (1991-01-01), Connan et al.
patent: 4989242 (1991-01-01), Arnaud
Fariello, "A digital Echo Suppressor for Satellite Circuits" IEEE Transactions on Communications, Dec. 1972, pp. 1176-1181.

Affiliated with

Also associated with

Rating

Echo suppression with both digital and analog variable attenuato does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Echo suppression with both digital and analog variable attenuato, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Echo suppression with both digital and analog variable attenuato will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-46189