Communications: electrical – Digital comparator systems
Patent
1979-06-07
1981-03-31
Yusko, Donald J.
Communications: electrical
Digital comparator systems
371 47, 371 71, H04Q 900, H04B 700
Patent
active
042596637
ABSTRACT:
When a plurality of transceivers share a common communication medium or radio frequency channel, then collision interference will result when two or more transceivers transmit simultaneously. In order to detect this simultaneous transmission, an interference detector apparatus compares the received information after demodulation to that of the transmitted information before modulation. The classification of the distorted signals into either of the two decoded output states permits this interference to be detected with a comparison. The output from the interference detector is used to interrupt the transmitter when collision interference is present on the medium. It is also used to inhibit the receiver from generating erroneous data during the interference duration.
REFERENCES:
patent: 3786187 (1974-01-01), Devita et al.
patent: 3962646 (1976-06-01), Tempka
patent: 3965294 (1976-06-01), Renz et al.
patent: 4045771 (1977-08-01), Loreck
patent: 4063220 (1977-12-01), Metcalfe et al.
"Modem Wrap Back Test", W. A. Berglund, IBM Technical Disclosure Bulletin, vol. 9, No. 3, Aug. 1966, p. 278.
Abolins Peter
Ford Motor Company
Sadler Clifford L.
Yusko Donald J.
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