A History of Audio Innovation
1965: Dolby introduces A-type® noise reduction for the professional market.
1968: Dolby introduces Dolby B-type® noise reduction for consumer products.
1970: Advent, Fisher, and Harman Kardon begin offering cassette tape recorders with Dolby B-type noise reduction.
1971: Dolby and Signetics create a simplified Dolby B-type integrated circuit, widening the range of products in which the technology could be used.
1975: Dolby introduces Dolby Stereo®, a highly practical 35 mm stereo optical release print format.
1977: Dolby receives acclaim with the release of Star Wars and Close Encounters of the Third Kind, both in Dolby Stereo.
1981: First product with Dolby C-type noise reduction reaches market.
1982: Dolby introduces Dolby Surround, which encodes the two tracks of any stereo source with four-channel surround sound.
1984: Dolby releases Dolby AC-1, our first digital coding system.
1986: Dolby SR (spectral recording) improves analogue recorder performance to equal, and in some respects surpass, costly digital recorders.
1987: Dolby Pro Logic® surround elevates the home cinema experience with four-channel surround sound.
1989: Dolby introduces Dolby AC-2, allowing separate facilities to do full professional-quality audio monitoring and dubbing remotely via ISDN lines.
1991: New multichannel audio coding system, Dolby AC-3, announced. Now known as Dolby Digital, its first application is as a sound format for films.
1995: First consumer products with Dolby Digital playback compatibility announced.
1998: First video game with interactive Dolby Digital 5.1 audio launched. Dolby Headphone technology announced.
1999: Codecs featuring new Dolby E for DTV multichannel audio production and distribution debut.
2000: Dolby Pro Logic II technology announced.
2002: Dolby Virtual Speaker technology introduced for consumers lacking the space for a dedicated 5.1-channel playback system.
2005: Dolby TrueHD lossless coding for high-definition video discs debuts.
2007: Dolby 3D Digital Cinema demonstrated to film industry.
2009: Dolby Axon brings 3D voice communication to online games.
2010: First public demonstration of 5.1-channel surround sound on a mobile phone using Dolby Mobile technology.
A more detailed Chronology available here.