Communications: electrical – Selective – Having electron beam device
Patent
1973-10-29
1977-08-16
Birmiel, Howard A.
Communications: electrical
Selective
Having electron beam device
340152T, 340183, 343 65R, G01V 122
Patent
active
040429067
ABSTRACT:
Continuous type analog data sampled at a high rate automatically is acquired in real time from data acquisition units, established at each of a plurality of spaced source stations. For example in seismic operations the units sense ground motion at spaced detector stations and convert resulting electrical signals to digital representations of such motion. A unique response code is set in each data acquisition unit. From a master station in or adjacent the prospect, data frame pulse sets are transmitted along with a series of channel sync pulses. At each unit digital representations of motion are stored upon receipt of each data frame pulse set. Sync pulses are received and counted at each unit following each data frame pulse set. The count of sync pulses at each said unit is decoded and compared with the respective response codes. In response to coincidence between each decoded count and response code, the stored signal is transmitted to the master station from each said unit.
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Birmiel Howard A.
Devine Thomas G.
Grossman Rene E.
Levine Harold
Texas Instruments Incorporated
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