Communications: electrical – Selective – Having electron beam device
Patent
1976-04-05
1978-10-17
Engle, Samuel W.
Communications: electrical
Selective
Having electron beam device
340 18CM, G01V 140
Patent
active
041211910
ABSTRACT:
Apparatus for increasing the seismic data storage capacity of magnetic tape. A pair of storage registers store a sequential pair of digitized seismic data samples. A subtractor coupled to these two registers provides an output equal to the difference between the two stored samples. A decoder and a set of gates couples the difference word serially to a bit comparator starting with the most significant bit. The first logical "1" which is encountered and all the lower order bits of the same word are serially coupled to and written in a read/write memory. The decoder and gates cause a "0" to be written in a second read/write memory at the beginning of each data word, and "1's" to be written in addresses corresponding to the data written in the first read/write memory. The data in the read/write memories are addressed for reading by a read/address counter, which is incremented by an incremental shaft encoder on a drive motor of a tape recorder. An up-down counter continuously monitors the difference between the number of bits written into the read/write memories and the number read from the memories and serially recorded by the tape recorder. The output of the up-down counter is used to control tape recorder motor speed.
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Cangialosi S. A.
Engle Samuel W.
McIlroy Arthur
Metrailer Albert C.
Standard Oil Company (Indiana)
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