FIELD: automatic control; research earthquake recording instrumentation. SUBSTANCE: method involves differential pulse- code modulation by additionally amplifying difference between current value of input analog signal and signal recovered from output digital train followed by adding signal obtained to input signal. Device implementing proposed method has n-bit analog-to-digital converter, n-bit digital-to-analog converter, subtracter, clock generator, adder, low-frequency filter, and amplifier. EFFECT: enlarged dynamic range and improved conversion characteristics. 2 cl, 1 dwg, 2 tbl
