APPARATUS AND METHODS FOR A STEPLESSLY VARIABLE COMPRESSION OF DIGITALLY STORED DATA SEQUENCES E ABSOLUTE AMOUNT VARY WIDELY FOR SUBSEQUENT VISUAL DISPLAY AND MONITORING PURPOSES

摘要

APPARATUS AND METHODS FOR A STEPLESSLY VARIABLE COMPRESSION OF DIGITALLY STORED DATA SEQUENCES WHOSE ABSOLUTE AMOUNT VARY WIDELY FOR SUBSEQUENT VISUAL DISPLAY AND MONITORING PURPOSES (D ?? 71,200-DTA-97) The apparatus and method provides for an improvement to a system which converts wide amplitude range digital data recorded in floating point digital word form to analog signals within a limited amplitude range. The apparatus and method provides for the situation wherein the digital data can represent an analog signal for which on a general decrease in amplitude increases may be superimposed. The apparatus includes a digital/analog converter whose reference voltage is individually determined for each sample. This reference voltage is taken from a saw tooth oscillator at an instant of time determined by a delay timer which responds to changes, with respect to a desired average amplitude, of the actual amplitude of the converted data.