Timing recovery circuit for digital data

Details Timing recovery circuit for digital data Timing recovery circuit for digital data

1975-08-25

1977-03-29

Griffin, Robert L.

Telegraphy

Systems

Line-clearing and circuit maintenance

179 15BS, 325346, 325419, 325420, H04L 700

Patent

active

040150836

ABSTRACT:
A timing recovery circuit receives a timing component signal and generates a signal having a frequency varying in response to a control signal. In response to a difference between the phase of the variable frequency signal and the phase of the timing component signal, the circuit produces a control component. In response to cycle slips between the variable frequency signal and the timing component signal, the circuit produces a series of pulses having a polarity related to the sense of the cycle slips and having a pulse rate directly related to the rate of the cycle slips except when amplitude of the timing component signals falls below a predetermined value whereupon no pulses are produced. The control component and the series of pulses are combined into the control signal that adjusts the frequency of the generated signal into synchronization with the timing component signal.

REFERENCES:
patent: 2858425 (1958-10-01), Gordon
patent: 3766484 (1973-10-01), Morris
patent: 3768030 (1973-10-01), Brown et al.
patent: 3863156 (1975-01-01), Bogert
patent: 3867579 (1975-02-01), Colton
patent: 3878474 (1975-04-01), Runge

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