Abstract: A method and apparatus wherein novel adaptive encoding and decoding processes are utilized to reduce the quantity of symbols or descripters required to transmit or store different classes of digital information. The codes used to describe repetitious binary sequences are caused to vary in length in accordance with a well-defined procedure to more efficiently represent the original data.

Abstract: A data handling system for converting an analog signal into binary form for storage or transmission to a remote receiver and subsequent reconstruction back into a facsimile of the original analog signal. The encoder portion of the system, which is a synthetic equivalent of an adaptive inverse filter, includes a signal comparator, an adaptive function generator and a binary pulse generating means. The signal comparator provides a signal responsive to the difference between the input analog signal and the output of the function generator, and the pulse generating means converts the difference signal into the encoded binary form for storage or transmission to a receiver. The decoder portion of the system includes an adaptive RC filter means which is controlled by the encoded data so as to reconstruct the original analog signal.

Abstract: An electronic half-tone generating circuit for enabling a black and white facsimile transmission system to accurately and efficiently transmit and reproduce images including shades of grey as well as black and white and including an integrator responsive to a first data signal and operative to integrate the difference between an input analog signal and a first reference potential to develop a first integral signal commensurate therewith, and responsive to a second data signal and operative to integrate the difference between the input analog signal and a second reference signal to develop a second integral signal commensurate therewith, a comparator responsive to the first and second integral signals and operative to develop a comparison signal when the first and second integral signals exceed a predetermined threshold value, and a signal generator responsive to the comparison signal and operative to develop the first data signal upon each odd numbered occurrence of the comparison signal and to develop the se

Abstract: An electronic nonuniform clock generating apparatus including a modulo N counter for counting uniform clock pulses in a controlled manner to develop a series of clock pulses which are nonlinearly related to the rotation of a scanning device to form a nonuniform clock signal comprised of a series of different clock states each including one or more uniform clock pulses, a clock signal counter for counting the nonuniform clock signal pulses, a clock signal decoder which is preprogrammed to develop an increment signal each time the count developed by the clock signal counter reaches a number commensurate with the number of pulses in a particular state, a state counter for counting the number of increment signals developed by the clock signal decoder to develop a clock signal decoder, and a state decoder responsive to the clock state signal output of the state counter and operative to control the operation of the modulo N counter.

Abstract: Video-to-binary conversion apparatus for use in image reproduction systems and the like to convert an input video signal to an output binary signal and comprising an output data normalizer for normalizing the binary output data signal relative to the input binary signal, an integrator for integrating the difference between the input video signal and the normalized output data signal and for developing an adaptable, data state determining threshold signal commensurate therewith, and a comparator for comparing the input video signal to the adaptive threshold signal to develop a binary output data signal which corresponds to the input video signal. The circuit electronically compensates for small signal errors which would otherwise occur in the transformation of the scan data from analog-to-binary form and which would give rise to a moire degradation in the reproduced image.