Company Filing History:
Years Active: 1998-2002
Title: Innovations of Alain Doreau
Introduction
Alain Doreau is a notable inventor based in Fremont, California. He has made significant contributions to the field of video technology, holding a total of five patents. His work focuses on improving the quality and synchronization of video signals, which has applications in various multimedia systems.
Latest Patents
One of Doreau's latest patents is a method and apparatus for automatic calibration of an analog video chromakey mixer. This invention presents an improved technique for mixing picture signals directed at a monitor screen. It allows for the multiplexing of two analog video signals, such as an analog VGA input and an analog RGB signal. The analog chromakey mixer detects a background color in the first video signal and replaces it with the second video signal. The invention also includes a mechanism for adjusting time delays to ensure that both signals reach the monitor screen simultaneously.
Another significant patent involves synchronizing to an input signal. This method and system synchronize to an incoming Hsync signal and generate a phase-locked clock signal in response. The design includes a sequence of modules that sample the incoming clock on transitions of the Hsync signal. The outputs are combined to produce a triangle-shaped waveform that is phase-locked to the Hsync signal and frequency-locked to the incoming clock.
Career Highlights
Alain Doreau has built a successful career at Sigma Designs, Inc., where he has been instrumental in