Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1998-01-30
1999-12-14
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
340540, 340669, 367 14, 367 27, 367 55, G08B 2100
Patent
active
060023392
ABSTRACT:
A system for synchronizing a seismic system having multiple subsystems. A control system transmits a message to selected subsystems and an internal subsystem counter is zeroed to a selected epoch. Depending on the message or on an internal instruction code, each subsystem initiates an event or sequence of events synchronized to the selected epoch. The system is based on the relative occurrence of cyclic events and does not depend on the transmission of an absolute time signal. The system is self rectifying, reduces systemic errors, and reduces the data transmission required for system control and operation. The system permits autonomous, asynchronous operation by a subsystem without continuous control by a central controller as a function of time, and can interactively respond to events without intervention from the central controller.
REFERENCES:
patent: 4635746 (1987-01-01), Lin
patent: 4800538 (1989-01-01), Passmore et al.
patent: 5548562 (1996-08-01), Helgerud et al.
patent: 5726637 (1998-03-01), Miyahara et al.
Atkinson Alan J.
Swann Glen
Western Atlas International Inc.
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