Ray Dolby, a sound engineer who revolutionized noise reduction and whose name became synonymous with "surround" audio, has died at age 80.
The founder of Dolby Laboratories suffered from Alzheimer's disease for several years and was diagnosed with leukaemia this summer.
Kevin Yeaman, president of Dolby, described Ray as a "true visionary."
Born in Portland, Oregon, he began his career in the Ampex Corporation, helping to develop early video recording systems while he was still a student.
"Though he was an engineer at heart, my father's achievements in technology grew out of a love of music and the arts," said his son Tom Dolby.