Timing extracting method suitable for a high bit-rate transmissi

Details Timing extracting method suitable for a high bit-rate transmissi Timing extracting method suitable for a high bit-rate transmissi

1989-09-08

1992-06-09

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

328 16, 328 30, H04L 702

Patent

active

051214164

ABSTRACT:
A method and circuit for extracting a timing clock in a Pulse Code Modulation (PCM) system capable of transmitting data at a rate which is on the order of a gigabit per second. A first clock signal is produced by extracting a fundamental frequency component from the received signal. A frequency-divided clock signal is produced by dividing the first clock signal by a predetermined division ratio. A second clock signal is produced by extracting a frequency component of the frequency-divided clock signal. The extracted clock signal is generated by multiplying the second clock signal by a ratio which corresponds to the division ratio.

REFERENCES:
patent: 3986126 (1976-10-01), Gindi et al.
patent: 4317212 (1982-02-01), Van Gerwen et al.
patent: 4466110 (1984-08-01), Kizaki et al.
patent: 4737980 (1988-04-01), Viola et al.
S. L. Larner et al., "A 565-Mbit/sec Monomode Transmission System", Optical Fiber Communication, Feb. 13, 1985, pp. 84-86.
Takano and Akashi, A 1/N Countdown Timing Extraction Circuit for a Gigabit Optical Fiber Transmission System, Fourteenth European Conference on Optical Communication, pp. 195-198, (Sep. 11, 1988).

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