Pulse or digital communications – Repeaters – Testing
Patent
1982-07-14
1985-03-12
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
329104, 328155, H04L 706
Patent
active
045049602
ABSTRACT:
A data reading apparatus for data transmission, for reading digital data from a digital signal series obtained by comparing the level of an incoming transmission signal obtained through a transmission path with a reference level at a detector, comprises a reference clock pulse generator for generating a reference clock pulse having a period equal to substantially 1/M of a transmission digit period of the digital signal series, a detecting circuit supplied with the digital signal series and the reference clock pulse generated by the reference clock pulse generator, for generating a level variation detection pulse in phase synchronism with level varying points corresponding to rising edges and/or falling edges of the digital signal series, a frequency dividing circuit reset by the level variation detection pulse from the detecting circuit, for generating a data reading timing clock pulse with a period substantially equal to the digit period of the digital signal series and with a phase delayed with respect to the level variation detection pulse, by frequency-dividing the reference clock pulse from the reference clock pulse generator, and a data reading circuit for obtaining a data reading output signal by latching the digital signal series by the data reading timing clock pulse obtained from the frequency dividing circuit.
REFERENCES:
patent: 3549804 (1970-12-01), Greenspan
patent: 3764989 (1973-10-01), McClellan
patent: 3921076 (1975-11-01), Currie
patent: 3986126 (1976-10-01), Gindi et al.
patent: 4242755 (1980-12-01), Gauzan
IBM Technical Disclosure Bulletin, vol. 17, No. 1, 6/74, pp. 206-207.
IBM Technical Disclosure Bulletin, vol. 13, No. 10, 3/71, pp. 2873-2876.
Chin Stephen
Griffin Robert L.
Victor Company of Japan Ltd.
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