Dolby A-type noise reduction, the original professional Dolby system introduced in 1965, is used on Dolby movie soundtracks. Dolby’s first technology was Dolby A-type noise reduction, introduced in 1965. It was designed for use by professional recording studios to make quiet master tape recordings. In the early to mid 1970’s its use was extended to film recording studios and motion picture release prints in order to make films sound better.
The prototype for the IMAX system is exhibited at EXPO ’67 in Montreal, Canada, where multi-screen films were the hit of the fair. IMAX technology promiered at the Fuji Pavilion, EXPO ’70 in Osaka, Japan. The first permanent IMAX projection system was installed at Ontariolace’s Cinesphere in Toronto in 1971. IMAX Dome (OMNIMAX) debuted at the Reuben H. Fleet Space Theatre in San Diego in 1973. The theaters tauted images of unsurpassed size, clarity and impact, enhanced by a specially-designed six-channel, multi-speaker sound system, projected onto giant rectangular screens, up to eight stories high. The IMAX image is ten times larger than a conventional 35mm frame and three times bigger than a standard 70mm frame. (http://www.mtsu.edu/~smpte/sixties.html)

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