Abstract: 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.

Abstract: Disclosed is a magnetic storage system which utilizes a dual planar magnetic disk storage device in combination with a magnetic head assembly having a local tracking device for producing small correctional movements to precisely align the magnetic transducer head to provide high density recording on a magnetic disk and thereby increase the total amount of information stored on the disk. The dual planar magnetic storage disk has magnetic wall regions which are permanently magnetized with either a horizontal or vertical polarity to produce a magnetic wall on each side of the data track. The local tracking device has sensor coils for sensing the location of the magnetic transducer head and reactor coils for producing a reaction coil magnetic field which interacts with either the magnetic wall field or the magnetic head assembly to produce the correctional movements of the local tracking device.