General Electric Company

George W Ellis

Charles M Puckette

Lewin T Baker

Sanjay K Bose

A method for transmission of digital data utilizes a carrier frequency offset in a first frequency direction for a first binary condition, and offset in a second frequency direction for the remaining binary condition, at the start of a bit time interval. The carrier frequency is swept in a preselected frequency direction during each bit time interval, to produce a chirped frequency-shift-keyed waveform in the frequency domain, for transmission of each bit of binary data. Frequency-shift-keyed demodulation is utilized at a receiving end, with the receiver synchronized to the transmitter bit time interval, to recover the transmitted digital data. Apparatus for data transmission using this chirped frequency-shift-keyed modulation waveform is disclosed.

Method and apparatus for data transmission using chirped

An analog signal processor is connected between a refresh memory at the output of the digital computer in an X-ray tomography system and a cathode ray tube display to provide a high resolution gray scale display of a selected portion from an analog signal having wide dynamic range.

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Burnt Hills, NY, United States of America

George W Ellis