Full duplex communication system for voice grade channels

Details Full duplex communication system for voice grade channels Full duplex communication system for voice grade channels

1980-10-15

1982-10-19

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 39, 370 20, H04L 300

Patent

active

043553974

ABSTRACT:
A pair of full duplex modems (12, 14), each at one end of a two-wire voice grade telephone channel (16), simultaneously transmit synchronous data at high speeds in both directions. In each modem, the simultaneous transmission and reception are accomplished by frequency division. The high speed operation is obtained by odd/even bit stream division and full response binary to ternary level coding coupled with nine level quadrature amplitude modulation and correction framing techniques.

REFERENCES:
patent: 3732495 (1973-05-01), McRae et al.
patent: 3760277 (1973-09-01), Whang
patent: 3845412 (1974-10-01), Rearwin
patent: 3937882 (1976-02-01), Bingham
patent: 4101833 (1978-07-01), Bingham et al.
patent: 4123710 (1978-10-01), Stuart
patent: 4285062 (1981-08-01), Yoshida

Affiliated with

Also associated with

Rating

Full duplex communication system for voice grade channels does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Full duplex communication system for voice grade channels, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Full duplex communication system for voice grade channels will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1341521