Inventor

QUAN RONALD

US125 patents

⚠️ This page may combine multiple inventors who share the name “QUAN RONALD”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

QUAN RONALD

MACROVISION CORP

Method and apparatus for modifying a video signal by back porch lowering

Method and apparatus for modifying the effects of color burst modifications to a video signal

Method and apparatus for reducing effects of copy protection of composite video signal

Method and apparatus for digitally removing or defeating effects of copy protection signals from a video signal

Method and apparatus for scrambling and descrambling of video signal with edge fill

Method and apparatus for defeating effects of color burst modifications to a video signal

Method and apparatus to reduce effects of certain copy protection purses within a video signal

Video copy protection process enhancement to introduce horizontal and vertical picture distortions

Method and apparatus to defeat certain copy protection pulses within a video signal

Method and apparatus for scrambling and descrambling

Wide frequency deviation voltage controlled crystal oscillator having plural parallel crystals

Method and apparatus for reducing and restoring the effectiveness of a commercial skip system

Method and apparatus for synthesizing and reducing the effects of video copy protection signals

Video copy protection process enhancement to introduce horizontal and vertical picture distortions

Method and apparatus for improving the effects of color burst modifications to a video signal

Method and apparatus for disabling anti-copy protection system in video signals

Method and apparatus for disabling anti-copy protection system in video signals using pulse narrowing

Copy protection for video signal using added negative amplitude pulse

Method and apparatus for providing or enhancing copy protection by adding selected negative-going and positive-going pulses in a video signal HBI

Method for modifying a copy protected video signal with a negative amplitude pulse

Method and apparatus for synthesizing or modifying a copy protection signal using a lowered signal level portion

Method and apparatus for modifying the effects of color burst modifications to a video signal

Dynamic video copy protection system

Method and apparatus for enhancing the scrambling of a TV signal via erroneous clamp signals

Method for locating copy protection pulses within selected video lines of a video signal

Method and apparatus for removing or defeating effects of copy protection signals from a video signal

Method and apparatus for recording scrambled video audio signals and playing back said video signal, descrambled, within a secure environment

Method and apparatus for modifying the envelope of a RF carrier signal to remove copy protection signals therefrom

Method and apparatus for removing or defeating effects of copy protection signals from a video signal

Method and system for scrambling and descrambling audio information signals

Method and apparatus for scrambling and descrambling of video signals with edge fill

Method and apparatus for scrambling and descrambling of video signal with edge fill

Method and apparatus for scrambling and descrambling of video signal with edge fill

Protection of a component video signal

Method and apparatus to defeat composite video signal protection

Copy protection for video signal added pulses

Audio scrambling system using in-band carrier

Variable frequency sine wave carrier signal generator

Method and apparatus for vertically scrambling and descrambling of video signals

Copy protection for video signal using narrowed horizontal synchronization signals

QUAN RONALD

Method and apparatus for improving speech recognition and identifying video program material or content

Method and apparatus for a gain control circuit via a high frequency signal

Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment

Method to synthesize video copy protection signals

HEWLETT PACKARD CO

Digital bar code slot reader with threshold comparison of the differentiated bar code signal

Focused line identifier for a bar code reader

Low powered high ambient light bar code reader circuit

ROVI SOLUTIONS CORP

Method and apparatus for reducing and restoring the effectiveness of a commercial skip system

Method and apparatus for reducing and restoring the effectiveness of a commercial skip system

SONY CORP

Constant quiescent current, class AB amplifier output stage