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Dolby Surround was the earliest consumer version of Dolby's multichannel analog film sound decoding format Dolby Stereo introduced to the public in 1982 during the time home video recording formats (such as Betamax and VHS) were earlier introducing Stereo and HiFi capability. Dolby Stereo (or Dolby Analog) was the original analog optical technology developed by Dolby Laboratories for 35 mm film prints in 1976 Year 1982 ( MCMLXXXII) was a Common year starting on Friday (link displays the 1982 Gregorian calendar) ---- Betamax is a home Videocassette tape recording format developed by Sony, and released on May 10, 1975. Stereophonic sound, commonly called stereo, is the reproduction of Sound, using two or more independent audio channels through a Symmetrical High fidelity or hi-fi reproduction is a term used by home stereo listeners and home audio enthusiasts ( Audiophiles to refer to high-quality reproduction The term Dolby Surround is used as not two confuse theater stereo which is at least four channels of audio with home stereo which is two. Dolby Surround is the earliest domestic version of theatrical Dolby Stereo. The term also applies to the encoding of material in this sound format.

When a Dolby Stereo/Dolby Surround soundtrack is produced, four channels of audio information—left, center, right, and mono surround—are matrix-encoded onto two audio tracks. The stereo information is then carried on stereo sources such as videotapes, laserdiscs and television broadcasts from which the surround information can be decoded by a processor to recreate the original four-channel surround sound. Videotape is a means of recording images and sound onto Magnetic tape as opposed to movie film. The Laserdisc (LD is an obsolete Home video disc format and was the first commercial Optical disc storage medium Without the decoder, the information still plays in standard stereo or monaural. As the technology of a Dolby Surround decoder is virtually similar in its implementation of decoding the monaural surround soundtrack, many Dolby Stereo encoded films could be transferred with little change to the stereo soundtrack lowering the costs of re-recording the audio of a film to video. Monaural (often shortened to mono) sound reproduction is single-channel Dolby Stereo (or Dolby Analog) was the original analog optical technology developed by Dolby Laboratories for 35 mm film prints in 1976 In fact most L/R/S Dolby Surround decoders included a modified Dolby B decoder as part of their design. Dolby NR is the name given to a series of noise reduction systems developed by Dolby Laboratories for use in analogue Magnetic tape recording The Dolby Surround decoding technology was updated during the mid-1980s and re-named Dolby Pro Logic in 1987. The 1980s was the decade spanning from January 1 1980 to December 31 1989. Dolby Pro Logic is a Surround sound processing technology designed to decode soundtracks encoded with Dolby Surround. Year 1987 ( MCMLXXXVII) was a Common year starting on Thursday (link displays 1987 Gregorian calendar) The terms Dolby Stereo, Dolby Surround and LtRt are used to describe soundtracks that are matrix-encoded using this technique.


Dolby Surround Matrix Left Right Center Surround
Left Total (Lt) 1 0 \frac {\sqrt 2}{2} j \frac {\sqrt 2}{2}
Right Total (Rt) 0 1 \frac {\sqrt 2}{2} k \frac {\sqrt 2}{2}

j = + 90º phase-shift, k = - 90º phase-shift

=

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