ROBERT STEWART POWELL, MD
Medical Practice at Zion Ave, San Diego, CA

6496547, Dec 17, 2002

Nov 30, 1999

09/451343

Robert F. Powell - San Diego CA
Aladino D. Sorgi - San Diego CA

Cubic Defense Systems, Inc. - San Diego CA

H04L 2706

375316, 375340, 329327, 329341, 455 42, 455205

A narrow-band digital frequency-modulation (FM) limiter-discriminator (LD) receiver with two independent detectors that combine to remove most of the bit errors caused by FM-clicks in an encoded channel. The output of the LD circuit is presented to a sample-and-hold (SH) detector and to an integrate and dump (ID) detector. Because the SH and ID detector outputs are offset in time by one-half bit and they are not entirely correlated, an error in one does not necessarily imply an error in the other. Using convolutional coding and Viterbi decoding, with threshold-compensation of the ID detector output and threshold- or envelope-compensation of the SH detector output, averaging the two compensated detector signals improves the receiver bit error rate (BER) performance by more than 3 dB over the soft-decision thresholded ID detector alone, which until now was believed to be optimum in the art.

5953760, Sep 21, 1999

Sep 10, 1996

8/711542

Robert F. Powell - San Diego CA

Tricel Corporation - San Diego CA

A42B 322

2424

A curved visor mechanism for helmets with laterally moveable visors that move on guides that define a track attached to the helmet. The visors are curved in the shape of a sector of an annulus of a circle. Using such a shape allows the track defined by the visors to maintain a nonzero rake angle at the front of the face area of the helmet, while preventing retracted visors from extending too close to the bottom of the back of the helmet. Removal of the visors from the helmet is accomplished by removing sections of the guides in which the visors move, preferably at the front of the helmet. This creates notches in the guides through which a visor can easily be inserted into and out of the helmet.