Multiplex communications – Wide area network – Packet switching
Patent
1978-09-28
1980-09-23
Moskowitz, Nelson
Multiplex communications
Wide area network
Packet switching
367 60, H04J 302, G01V 124
Patent
active
042244749
ABSTRACT:
A seismic data acquisition system provides seismic signal data samples in multiplexed channel sequential order during a recording cycle. The multiplexed data samples from a recording cycle are demultiplexed by storing the data samples in consecutive order in a memory, having addressable locations, in addressed locations separated by a first desired address increment. The data samples are then extracted from addressed locations that are separated by a second desired address increment. Substantially concurrently, data samples from a subsequent recording cycle are stored in the memory locations vacated by the previously extracted data samples. The data samples from the subsequent recording cycle are demultiplexed by extracting stored data samples from memory locations that are separated by a third desired increment. The above steps are repeated for additional recording cycles, using a different address increment for each extraction step. The extracted demultiplexed data samples may be recorded on an archival storage medium.
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Knox William A.
Moskowitz Nelson
Western Geophysical Co. of America
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