Alex_Zapantis
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Αντίο κύριε Dolby...
http://en.wikipedia.org/wiki/Ray_Dolby
http://www.stereophile.com/content/ray-dolby-1933-2013
http://en.wikipedia.org/wiki/Ray_Dolby
Dolby noise reduction (Main article: Dolby noise-reduction system)
http://en.wikipedia.org/wiki/Dolby_noise-reduction_system
The Dolby noise-reduction system works by increasing the volume of low-level high-frequency sounds during recording and correspondingly reducing them during playback. This reduction in high-frequency volume reduces the audible level of tape hiss.
http://www.stereophile.com/content/ray-dolby-1933-2013
...
It was Ray Dolby's invention of Dolby-A noise reduction that made the explosion in multitrack recording of rock music in the early 1970s possible. I vividly remember engineer Jerry Boys playing me all 24 tracks of the studio's new MCI tape recorder, which used 2" tape. Nothing had been recorded and all was quiet. Then Jerry turned off the Dolby-A noise reduction and we were overwhelmed with tape hiss!