a microcomputer system for converting an analog signal , such as an audio signal representative of sound into a digital form for storing in digital form in a highly condensed code and for reconstructing the analog signal from the coded digital form is disclosed . the system includes reductive analytic means where the original digital data stream is converted to a sequential series of frequency spectrograms , signal amplitude histograms and waveform code tables . approximately 100 times less storage space than previously required for the storage of digitized audio signals of high fidelity quality is thereby obtained . additive synthesis logic interprets the stored codes and recreates an output digital data stream for digital to analog conversion that is nearly identical to the original analog signal .