David C Huffman

US Patent:

6995774, Feb 7, 2006

Filed:

Jul 10, 2002

Appl. No.:

10/192812

Inventors:

Keith I. Tognoni - Duluth GA, US
David C. Huffman - Norcross GA, US
James S. Parker - Cumming GA, US

Assignee:

L3 Communications Corporation - New York NY

International Classification:

G09G 5/02

US Classification:

345589, 345611, 348618

Abstract:

A method and apparatus for diminishing display transients and jitter. The method and system disclosed utilizes prior illumination and position histories in displaying and illuminating representations, and elements comprising the representations, on the display. Recognizing repeated representations, finding their prior and current positions, and determining if the difference in position is over a threshold value, diminishes the jitter by displaying the representation in the new position if over the threshold value, or, if it is not over the threshold value, then displaying it in the prior location. The illumination of an element at an intensity, which is based on prior illuminations and/or intensities of the element, diminishes the transients by avoiding flashing or flicker of transient illuminations.

US Patent:

7768537, Aug 3, 2010

Filed:

Aug 25, 2005

Appl. No.:

11/211245

Inventors:

Keith I. Tognoni - Duluth GA, US
David C. Huffman - Norcross GA, US
James S. Parker - Cumming GA, US

Assignee:

L3 Communications Corporation - New York NY

International Classification:

G09G 5/00
G09G 5/10
H04N 5/00
G06K 9/00
G06K 9/36
G06K 9/40

US Classification:

345672, 345611, 345690, 348607, 382107, 382236, 382260, 382275

Abstract:

A method and apparatus for diminishing display transients and jitter. The method and system disclosed utilizes prior illumination and position histories in displaying and illuminating representations, and elements comprising the representations, on the display. Recognizing repeated representations, finding their prior and current positions, and determining if the difference in position is over a threshold value, diminishes the jitter by displaying the representation in the new position if over the threshold value, or, if it is not over the threshold value, then displaying it in the prior location. The illumination of an element at an intensity, which is based on prior illuminations and/or intensities of the element, diminishes the transients by avoiding flashing or flicker of transient illuminations.

US Patent:

51681994, Dec 1, 1992

Filed:

Aug 14, 1991

Appl. No.:

7/744918

Inventors:

David C. Huffman - Norcross GA
Joseph W. Goode - Lawrenceville GA

Assignee:

Loral Corporation - Yonkers NY

International Classification:

G09G 104
H01J 2974

US Classification:

315370

Abstract:

An improved system for continuously detecting and correcting the display in a cathode ray tube for errors in size and linearity. The system employs a crystal oscillator as a reference frequency to determine absolute error which is represented as "size" on the display screen, and relative error which is represented as linearity. The error is determined from the index pulse feedback, which is an output of a phase lock loop voltage controlled oscillator which is compared to the reference frequency to provide an error voltage level. This output level is then digitized and processed in terms of general control, interpolation, extrapolation, filtering, etc. , testing, and stored in digital memory. The digital error data is converted back to analog levels for insertion into a horizontal auxiliary amplifier circuit for linearity correction. A main horizontal amplifier circuit receives size correction.