John P Stahler

US Patent:

D361558, Feb 20, 1990

Filed:

Aug 29, 1988

Appl. No.:

7/238573

Inventors:

John P. Stahler - La Jolla CA
David B. Hartley - San Diego CA
Stephen O. Ross - Del Mar CA

Assignee:

Robot Research, Inc. - San Diego CA

US Classification:

D13 35

US Patent:

45161518, May 7, 1985

Filed:

May 28, 1982

Appl. No.:

6/383111

Inventors:

John P. Stahler - San Diego CA

Assignee:

Robot Research, Inc. - San Diego CA

International Classification:

H04N 940

US Classification:

358 14

Abstract:

A method and system for translating between three complementary color component slow scan video signals and a composite color slow scan video signal containing a frequency modulated (FM) luminance information signal within a first frequency range of the slow scan video signal frequency band and an FM chrominance information signal within a separate second frequency range of the slow scan video signal frequency band, wherein the chrominance information signal includes a first color difference signal derived by subtracting the luminance information signal from one of three complementary color slow scan video signals and a second color difference signal derived by subtracting the luminance information signal from another of three complementary color slow scan video signals. The three complementary color component slow scan video signals are translated into the composite color slow scan video signal for transmission. Upon reception, the composite signal is translated into the three complementary signals for provision to a three memory slow-to-fast scan converter.

US Patent:

45648239, Jan 14, 1986

Filed:

Sep 24, 1984

Appl. No.:

6/653150

Inventors:

John P. Stahler - San Diego CA

Assignee:

Robot Research, Inc. - San Diego CA

International Classification:

H03C 500
H03D 500

US Classification:

332 17

Abstract:

A modulation system wherein a carrier signal is modulated by an input signal having a variable amplitude, either analog or digital. The amplitude of the input signal is sampled every predetermined fractional cycle of the modulated signal; and the carrier signal is modulated in response to the sampled amplitude of the input signal to provide a modulated signal of which each predetermined fractional cycle has an amplitude and a duration that are inversely proportional to each other and related to the sampled amplitude of the input signal. The modulated signal is demodulated by either or both of the techniques of zero-crossing detection and peak-amplitude detection. The system is self-clocking, without discontinuous phase or amplitude changes and without DC components being introduced. The system transmits its own signal-recovering clock information and thereby permits modulation at a rate in excess of the carrier signal frequency.

US Patent:

46511954, Mar 17, 1987

Filed:

Apr 4, 1983

Appl. No.:

6/481752

Inventors:

John P. Stahler - San Diego CA

Assignee:

Robot Research, Inc. - San Diego CA

International Classification:

H04N 1118

US Classification:

358 14

Abstract:

A method and system for translating between three complementary color component slow scan video signals and a composite color slow scan video signal containing a luminance information signal within a visible line interval of each slow scan video signal line and a chrominance information signal within the non-visible portion of each slow scan video signal line. The chrominance information signal includes during the non-visible portions of alternate slow scan video signal lines, a first color difference signal derived by subtracting the luminance information signal from one of three complementary color slow scan video signals and a second color difference signal derived by subtracting the luminance information signal from another of three complementary color slow scan video signals. The three complementary color component slow scan video signals are translated into the composite color slow scan video signal for transmission. Upon reception, the composite signal is translated into the three complementary signals for provision to a three memory slow-to-fast scan converter.