Circuitry for derivations of clock signals from...

Details Circuitry for derivations of clock signals from... Circuitry for derivations of clock signals from...

H - Electricity

04

J

363/13

H04J 3/06 (2006.01) H04L 7/02 (2006.01)

Patent

CA 1165021

ABSTRACT OF THE DISCLOSURE A system is disclosed in which a differential phase-shift keyed, pulse-code-modulated transmission is itself delta-modulated in order to derive a transmission clock signal characteristic of -the transmission, as opposed to being characteristic of an underlying data signal which is used as a modulating waveform in the transmission. The delta-modulation detects changes in state of the data trans- mission, which changes in state can be monitored in order to derive the transmission clock signal utilized. In a preferred embodiment, a phase-locked loop may be utilized to produce a pulse train having the same frequency as, and being in phase with, such changes of state in the transmission. -1-

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