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Research Paper- Surround Sound Development of Surround Sound We are now entering the third age of reproduced sound The monophonic era was the first age which lasted from Edisons invention of the phonograph in 1877 until the 1950s During those times the goal was simply to reproduce the timbre of the original sound No attempts were made to reproduce directional properties or sound realism The stereo era was the second age It was based on inventions from the 1930s reached the public in the mid-50s and has provided great sound for music listeners for four decades Stereo improved the reproduction of timbre and added two dimensions of space the left- right spread of performers across a stage and a set of acoustic cues that allow listeners to perceive a front-to-back dimension In two-channel stereo this impression of realism is based on fragile sonic cues In most ordinary two-speaker stereo systems these subtle cues can easily be lost causing the playback to sound flat and not enjoyable Multi-channel surround systems on the other hand can provide this involving presence in a way that is reliable and consistent The purpose of this article is to explore the advances and technologies of surround sound in the consumer market I will discuss about the different formats available both for movie theaters and for the home entertainment systems The principal format for digital discrete surround is the 51 channel system The 51 name stands for five channels in front left right and center and behind left surround and right surround of full-bandwidth audio 20 Hz to 20 kHz plus a sixth channel which will at times contain additional bass information to maximize the impact of scenes such as explosions etc This channel has only a narrow frequency response 3 Hz to 120 Hz so it is sometimes referred to as the 1 channel When added together the system is sometimes referred to as having 51 channels
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