MULTICHANNEL ANALOG-TO-DIGITAL CONVERTER FOR SEISMIC INVESTIGATIONS BY USING DELTA MODULATION Russian patent published in 1995 - IPC

FIELD: seismic investigation apparatuses. SUBSTANCE: analog-to-digital converter has input channel switch, subtracter, gated comparator, similar-type analog storage and retrieval devices, as many as number of channels, decoder, clock generator, and flip-flop; each storage and retrieval device is handled delta modulator integrator for respective input analog data channel. EFFECT: improved design. 2 dwg