Timing recovery circuit for manchester coded data

Details Timing recovery circuit for manchester coded data Timing recovery circuit for manchester coded data

1985-10-15

1987-04-28

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

375 82, 375 87, 328 63, H04L 702

Patent

active

046619658

ABSTRACT:
A timing recovery circuit for recovering timing signals out of split phase or Manchester coded data, comprising dotting (DOT), frame synchronization (FS) and information (DATA) in digital form. A digital voltage controlled oscillator (VCO) provides a signal whose frequency is twice that of the timing signal of the split phase signal and a frequency divider generates a signal whose frequency is equal that of the timing signal. The outputs of the VCO and the frequency divider are selectively applied to a phase detector, also having as an input the split phase signal, for the generation of a feedback control signal, depending on whether the split phase signal is advanced or delayed. The higher-frequency VCO signal is applied during the DATA segment of the incoming signal while the frequency divider signal is applied during the DOT and FS segments.

REFERENCES:
patent: 4606050 (1986-08-01), Sekigawa et al.
"The Bell System Technical Journal", vol. 58, No. 1, Jan. 1979, pp. 139-143.

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