Communications: electrical – Selective – Having electron beam device
Patent
1975-11-10
1977-12-20
Moskowitz, Nelson
Communications: electrical
Selective
Having electron beam device
330 51, 340 155DP, G01V 128, H03F 114
Patent
active
040644804
ABSTRACT:
An amplifying channel provides amplified signals corresponding to a received wide dynamic range analog input signal such as provided by a geophone group. A plurality of level comparators which number one less than the number of amplified signals compare the amplified signals with reference signals corresponding to a predetermined range of a desired output signal. The comparators provide outputs corresponding to the comparison to logic circuitry which develop sampling signals. The amplified signals from the amplified channel are also provided to a plurality of switches which are controlled by sampling pulses provided by the logic circuitry to sample an amplified signal within the range defined by the reference signals and provide it as the analog output signal. The analog output signal is converted to digital signals which are provided with other digital signals corresponding to the gain relationship between the analog output signal and the received analog input signal.
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patent: 3969683 (1976-07-01), Fabricius
Gillespie Ronald G.
Moskowitz Nelson
Ries Carl G.
Texaco Inc.
Whaley Thomas H.
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