It was also the ambient surround sound something that most of us call sound effects. Movies like Jurassic Park saw viewers experiencing a completely new dimension in movie watching. What happened then was that Dolby Stereo, a technology developed by Dolby Laboratories Inc., made a formal entry into the Indian film scenario. Dolby Laboratories Inc. was responsible for two things reducing noise in any kind of recording and channeling sound in multiple directions. Any kind of recorded sound had a basic problem background hiss.
Sound comprises soft and strong signals.
This led the stronger signals to mask noise, thereby giving clear sound. Dolby Stereo made it possible to print multi-track sounds on to the same old optical film. In the 1920s, when sound made its entry into films, it was put directly onto the photographic or optical film and was called optical film sound track. Then in 1950s, magnetic striping came into vogue and with it, multi-track recording. Sound was now distributed in the theatre in many channels-left, right and center.