Data transmission systems

Details Data transmission systems Data transmission systems

1982-02-16

1984-03-06

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

370 86, 375 36, H04Q 900

Patent

active

044357052

ABSTRACT:
A communicating network in which encoder/decoders are joined in a ring by transmission links. Data passes over the links as a carrier having two cycles per bit period. The amplitude of the carrier in any bit period is non-zero and represents the value of the bit. In each encoder/decoder the carrier is recovered by a tuned circuit, the clock is recovered by dividing the carrier and the data is recovered. The same carrier is remodulated with the output data. The whole system forms an oscillatory system which sustains the carrier at a frequency which varies if the properties of the ring change.
The specification also describes the use of a modulated carrier in conjunction with a filter blocking frequencies below 25 MHz to give good noise immunity.

REFERENCES:
patent: 3582782 (1971-06-01), Danielsen
patent: 3744051 (1973-07-01), Sanders et al.
patent: 4042783 (1977-08-01), Gindi
patent: 4078228 (1978-03-01), Miyazaki
patent: 4086534 (1978-04-01), Olson
patent: 4121050 (1978-10-01), Witt
patent: 4199662 (1980-04-01), Lowe, Jr.
patent: 4304001 (1981-12-01), Cope

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