Fujitsu Corporation

Jennison Holding, Inc.

Robert W Parry

Alan Robert Selfridge

Edwin F Johnson

John P Fairbanks

Michael T Jennison

Verne H Wilson

Edward C Nichols

James D Cummins

James A Kriewall

Cornelius E Holliday, Iii

The present invention presents a multimedia signal distribution device that implements the Electronics Industry Association (EIA) 'Node Zero' standard for a Consumer Electronics Bus (CEBus) signal distribution network. The preferred embodiment of the present invention comprises a block frequency conversion loop that is combined with other conventional electronic devices to accomplish the multimedia signal frequency conversion, filtering and distribution functions required of the ideal Node Zero device set forth in the EIA CEBus standard. The present invention preferably implements the CEBus block frequency conversion, input and output band-pass filtering, and signal amplification requirements by a block frequency conversion loop comprised of the following components which process the internal signal block in the following series order: (a) passive first low-pass or band-pass filter; (b) a 1000 MHz first frequency mixer; (c) an intermediate frequency (IF) filter; (d) a 38 dB signal amplifier; (e) a selectable second frequency mixer and (f) a tunable second low-pass or band-pass filter 11. Optionally, a broad-band quadrature signal phase shifting device may be implemented in conjunction with a signal coupling balun transformer at the input and output, respectively, of the first frequency mixer. This quadrature phase shifting improves the filtering of the internal signal block after the quadrature outputs have been shifted by the first frequency mixer to an intermediate frequency (IF) signal range.

CEBus node zero switching device

A digitizer uses acoustic waves originating from a stylus to determine the position of the stylus on a plate. The acoustic waves are introduced into the plate from the tip of the stylus and are detected by a plurality of detectors positioned at various points along the periphery of the plate. By sensing differences in the arrival times of the acoustic waves at the detectors, a microprocessor calculates the position of the stylus. In a preferred embodiment using a non-tethered stylus, four detectors are positioned at the corners of a rectangle, and the time differences are used as addresses in a lookup table, which is programmed to contain x and y coordinates corresponding to the time differences, Different embodiments may detect only the 'fast' symmetrical waves or only the 'slow' antisymmetrical waves generated in the plate, or may use the arrival times of both types of waves to determine the stylus position.

Stylus position digitizer using acoustic waves

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Santa Cruz, CA, United States of America

Robert W Parry