Apparatus for detecting the rhythm of an NRZ message

Details Apparatus for detecting the rhythm of an NRZ message Apparatus for detecting the rhythm of an NRZ message

1975-11-17

1977-06-14

Pitts, Harold I.

Telegraphy

Code transmitters

Rotary contact

178 691, H04I 700

Patent

active

040299058

ABSTRACT:
The device comes within the branch of digital transmission and refers more particularly to the problem of the recognition of a message coded in the "no return to zero" code, which is usually rhythmed by a given frequency. According to the invention, a phase-locked loop is provided for reconstituting the original rhythm from the message, and a phase shifter having an instantaneous action is additionally provided in that loop. The analysis of the reaction of the loop after that phase shift, by means of integrators, gives a statistical data information on the existence of a message. The invention applies more particularly to very noisy NRZ transmission lines.

REFERENCES:
patent: 3593160 (1971-07-01), Moore
patent: 3621140 (1971-11-01), Griffiths
patent: 3747067 (1973-07-01), Fox
patent: 3778550 (1973-12-01), David
patent: 3789303 (1974-01-01), Hoffman
patent: 3819853 (1974-06-01), Stein
patent: 3932705 (1976-01-01), Wulleman
patent: 3953674 (1976-04-01), Fletcher

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