Pulse or digital communications – Repeaters – Testing
Patent
1987-03-16
1990-02-13
Ng, Jin F.
Pulse or digital communications
Repeaters
Testing
370 321, 375 8, H04L 2708
Patent
active
049013335
ABSTRACT:
A modem for a digital data transmission system in which binary-coded data at up to 9.6 Kbit/sec is transmitted over a telephone line pair circuit, as phase and amplitude modulation (QAM) of a carrier signal at a frequency of 1800 Hz, at a line symbol rate of 2400 bauds. The modem utilizes two data signal processors (4 and 5) and two gate arrays (6 and 7), controlled by a microprocessor (8), to carry out digitally all the processes required to convert binary coded data signals into PCM coded samples of the required carrier signal for transmission and to recover binary coded data signals from PCM coded samples of a received carrier signal.
REFERENCES:
patent: 4074086 (1978-02-01), Falconer et al.
patent: 4121165 (1978-10-01), Dogliotti et al.
patent: 4355214 (1982-10-01), Levy et al.
patent: 4422175 (1983-12-01), Bingham et al.
patent: 4457004 (1984-06-01), Gersho et al.
patent: 4539675 (1985-09-01), Fisher
patent: 4577334 (1986-03-01), Boer et al.
patent: 4621173 (1986-11-01), Guidoux
patent: 4675863 (1987-06-01), Paneth et al.
patent: 4682358 (1987-07-01), Werner
patent: 4686703 (1987-08-01), Bruno et al.
patent: 4694469 (1987-09-01), Kaku et al.
"A New Digital Echo Canceller for Two-Wire Full-Duplex Data Transmission", Mueller, IEEE Transaction on Communications, vol. Com-24, No. 9 Sep. 1976 pp. 956-62 379/410.
"Microprocessor Implementation of High-Speed Data Modems", Van Gerwen et al., IEEE Transactions on Communications, vol. Com-25, No. 2, Feb. 1977 pp. 238-250.
Ng Jin F.
The General Electric Company p.l.c.
Vaas Randall
LandOfFree
Data transmission systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Data transmission systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data transmission systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1174571