Dacom Corporation

Rapicom Inc.

Donald R Weber

James G Tisue

Peter A Johanson

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.

Data handling system using a sequential approximation encoding and

Data transmission system using a sequential approximation encoding and

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.

Method and apparatus for compressing facsimile transmission data

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 second data signal upon each even numbered occurrence of the comparison signal. The data signals are comprised of a series of data bits each of which identifies the data state of a discrete elemental area of the scanned information. Also disclosed are a screened version in which mezzo data is converted to a particular format for transmission, and a hybrid version in which mezzo system elements are used alternately with screened system elements to produce a reproduction having optimum picture quality.

Growing community of inventors

Saratoga, CA, United States of America

Donald R Weber