Arrangement for the automatic resynchronization of a data transm

Details Arrangement for the automatic resynchronization of a data transm Arrangement for the automatic resynchronization of a data transm

1977-10-03

1979-12-25

Safourek, Benedict V.

Telegraphy

Systems

Line-clearing and circuit maintenance

325323, H03H 736

Patent

active

041807057

ABSTRACT:
A resynchronization arrangement for a data receiver having an auto-adaptive equalizer and a demodulator which utilizes a local carrier phaselocked on the received carrier by means of a control loop comprising an integrating circuit. Starting from a signal indicating a synchronization loss the arrangement generates three command pulses: a first pulse makes the adjustable coefficients of the equalizer and the signal in the memory of the integrating circuit equal to zero; a second pulse is used for making a reduced number of coefficients of the equalizer operative immediately after the first pulse and for reducing the time constant of the integrating circuit; a third pulse is used to make the synchronization loss indication signal equal to zero a given period of time after the end of the second pulse. Resynchronization is obtained without the necessity of a return connection to the transmitter.

REFERENCES:
patent: 3955141 (1976-05-01), Lyon et al.
patent: 4061978 (1977-12-01), Motley et al.

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