User:Juuyuau/Dolby Stereo

Dolby Stereo
"Dolby Stereo is a sound format made by Dolby Laboratories. There are two basic Dolby Stereo systems: the Dolby SVA (stereo variable-area) 1976 system used with optical sound tracks on 35mm film, and Dolby Stereo 70mm which refers to Dolby noise reduction on 6-channel magnetic soundtracks on 70mm prints." (Add a reliable citation to [1]).

"Dolby SVA takes a significant role in improving the development of sound effects in films and theorization of Sound Design by Walter Murch. Later, it was adapted for home use in 1982 as Dolby Surround when HiFi capable consumer VCRs were introduced, and further improved in 1987 with the Dolby Pro Logic decoding system (see the Dolby Surround/Dolby Pro Logic (home decoders) section)."

'''Although there were many acoustical differences between two systems, they were both introduced to the market as Dolby Stereo, bringing a simplified brand identity of Dolby. '''

"Of the two, Dolby SVA was by far the more significant, as it brought high-quality stereo sound within the reach of virtually every cinema. Though 6-track magnetic stereo had been used in Cinerama films since 1952, and Fox had introduced 4-track stereo magnetic sound as part of the CinemaScope system in 1953, the technology had proved to be expensive and unreliable. Except in large cities, most movie theaters did not have facilities for playing back magnetic soundtracks, and a majority of films continued to be produced with mono optical soundtracks. Dolby SVA provided a method for putting high-quality stereo soundtracks on optical sound prints." (Add a reliable citation to [2]).

After Uhlig brought his idea and worked with Dolby, Dolby SVA (stereo variable area) as a 35mm stereo variable-area optical encoding and decoding system came up and later was adopted as an industry standard--ISO 2969 .