Circuitry for extraction of a transmission clock signal from-mod

Details Circuitry for extraction of a transmission clock signal from-mod Circuitry for extraction of a transmission clock signal from-mod

1980-02-19

1982-09-07

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

332 11D, 340347AD, H03K 1322

Patent

active

043487696

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.

REFERENCES:
patent: 2803702 (1957-08-01), Ville
patent: 3550082 (1970-12-01), Tong
patent: 3588364 (1971-06-01), Wallingford
patent: 3619662 (1971-11-01), Vachon
patent: 3806806 (1974-04-01), Brolin
patent: 4010323 (1977-03-01), Peck
patent: 4027266 (1977-05-01), Clark
patent: 4087754 (1978-05-01), Song
patent: 4122300 (1978-10-01), Busigny
patent: 4215311 (1980-07-01), Kittel et al.

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