Seismic processing and recording system - has amplifying channel providing amplified signals of different amplitudes each compared by comparators

摘要

The seismic system comprises a amplifying channel which provides amplified signals corresponding to a received wide dynamic range analog input signal such as provided by a geophone group. A number of level comparators 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 number 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 analgo output signal.