Ray Dolby


Dolby (left) being inducted into the National Inventors Hall of Fame, 2004

Born: Ray Milton Dolby; January 18, 1933; Portland, Oregon, U.S.
Died: September 12, 2013 (aged 80); San Francisco, California, U.S.
Education: Stanford University (BE); Pembroke College, Cambridge (PhD)
Spouse: Dagmar Bäumert ​{m. 1966}
Children: Tom Dolby, David Dolby

Ray Milton Dolby (/ˈdoʊlbi, ˈdɒl-/; January 18, 1933 – September 12, 2013) was an American engineer and inventor of the noise reduction system known as Dolby NR. He helped develop the video tape recorder while at Ampex and was the founder of Dolby Laboratories.

Early life and education
Dolby was born in Portland, Oregon, the son of Esther Eufemia (née Strand) and Earl Milton Dolby, an inventor. He attended Sequoia High School (class of 1951) in Redwood City, California. As a teenager in the decade following World War II, he held part-time and summer jobs at Ampex in Redwood City, working with their first audio tape recorder in 1949. While at San Jose State College and later at Stanford University (interrupted by two years of Army service), he worked on early prototypes of video tape recorder technologies for Alexander M. Poniatoff and Charlie Ginsburg.

In 1957, Dolby received his B.Sc. in electrical engineering from Stanford. He subsequently won a Marshall Scholarship for a Ph.D (1961) in physics from the University of Cambridge, England, where he was a Research Fellow at Pembroke College and completed his PhD, "Long wavelength X-ray microanalysis" under the supervision of Ellis Cosslett.

Career
As a non degree-holding "consultant", Dolby played a key role in the effort that led Ampex to unveil their prototype Quadruplex videotape recorder in April 1956 which soon entered production.

After Cambridge, Dolby acted as a technical advisor to the United Nations in India until 1965, when he returned to England, where he founded Dolby Laboratories in London with a staff of four. In that same year, 1965, he invented the Dolby noise-reduction system, a form of audio signal processing for analog tape recorders. His first U.S. patent application was made in 1969, four years later. The system was first used by Decca Records in the UK.

The Dolby B consumer noise-reduction system works by compressing (boosting) low-level high-frequency sounds during recording and expanding (decreasing) them symmetrically during playback, which also decreases inherent tape noise. This reduces the audible level of tape hiss. The professional Type A system operates on four different frequency bands, and the final SR system on ten.

After his pioneering work with audiotape noise reduction, Dolby sought to improve film sound. As Dolby Laboratories' corporate history explains:

Upon investigation, Dolby found that many of the limitations in optical sound stemmed directly from its significantly high background noise. To filter this noise, the high-frequency response of theatre playback systems was deliberately curtailed… To make matters worse, to increase dialogue intelligibility over such systems, sound mixers were recording soundtracks with so much high-frequency pre-emphasis that high distortion resulted.

The first film with Dolby sound was A Clockwork Orange (1971), which used Dolby noise reduction on all pre-mixes and masters, but a conventional optical sound track on release prints. Callan (1974) was the first film with a Dolby-encoded optical soundtrack. The first true LCRS (Left-Center-Right-Surround) soundtrack was encoded on the movie A Star Is Born in 1976. In fewer than ten years, 6,000 cinemas worldwide were equipped to use Dolby Stereo sound.

Dolby then developed a digital surround sound compression scheme for the cinema. Dolby Stereo Digital (now simply called Dolby Digital) was first featured on the 1992 film Batman Returns. Dolby Digital is now found in the HDTV (ATSC) standard of the United States, DVD players, and many satellite-TV and cable-TV receivers.

Dolby was a Fellow and past president of the Audio Engineering Society.

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U.S. patents
U.S. patent 3,631,365, Frequency selective, symmetric signal compressor/expander (Dolby noise reduction); application filed October 20, 1969, patent granted December 28, 1971

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