Circuitry for extraction of a transmission clock signal from-modulated data transmissions
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United States of America Patent
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-
Sep 7, 1982
Grant Date -
N/A
app pub date -
Feb 19, 1980
filing date -
Feb 22, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system is disclosed in which a 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 transmission, 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.
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