a system designed to duplicate Dolby Stereo in homes using three channels and four speakers.

One of the original versions of Dolby Surround Sound, has since been replaced by later versions known as Dolby Pro Logic & Dolby Pro Logic II. This format was taken from the Dolby Stereo film sound.

An early multichannel audio system from Dolby Laboratories having four speakers and three channels, with the left front and right front speakers each having their own channels, and a pair of rear speakers sharing a channel.

Introduces in late 80s, dolby surround provides 4 channels of surround sound. Available with many home theater systems, dolby digital and dolby surround stereo systems give you that 'movie' experience to immerse you in atmospherics and ambient sounds - just like the movies.

Another surround format that came out before Dolby ProLogic. It consists of only three channels: left/right front channels, and one surround channel. 2 - Another surround format that came out before Dolby Prologic. It consists of only three channels: left/right front channels, and one surround channel.

Matrix analog coding of four audio channels - Left, Center, Right, Surround (LCRS) - into two channels referred to as Right-total and Left-total. The Dolby Surround system originally was developed for motion pictures.

Older than Pro Logic, Dolby Surround has been superceded by later, better formats.

First generation home theater format that recovers surround information from encoded program material and feeds it to a pair of surround speakers placed up on the side walls adjacent to the listening area. Outputs three channels: left, right, and surround (usually split into 2 rear speakers). http://www.dolby.com/tech/#head3

The home surround-sound format derived from Dolby Stereo film sound.

Encodes sound for rear effects channels into the stereo tracks. Needs to be replayed through a decoder to produce surround.

The standard for encoding surround-sound audio in a two-channel stereo signal. A decoder, such as a Dolby Pro Logic circuit, can then extract the center and surround channels. A Dolby Surround decoder extracts surround channels, while a Dolby Pro Logic decoder uses additional processing to create a center channel. The process is essentially independent from the recording or transmission format. Both Dolby Digital and MPEG audio compression systems are compatible with Dolby Surround audio.

four audio channels (left, center, right, and surround) converted to two channels referred to as right-total and left-total.

The standard for matrix encoding surround-sound channels in a stereo signal by applying a set of defined mathematical functions when combining center and surround channels with left and right channels. The center and surround channels can then be extracted by a decoder such as a Dolby Pro Logic circuit which applies the inverse of the mathematical functions. A Dolby Surround decoder extracts surround channels, while a Dolby Pro Logic decoder uses additional processing to create a center channel. The process is essentially independent of the recording or transmission format. Both Dolby Digital and MPEG audio compression systems are compatible with Dolby Surround audio.

This sound technique was developed by the American, Ray Dolby. It is a system that works with 5 loudspeakers. The loudspeakers are set up in front of and behind the place where the sound is to be heard. A decoder or a corresponding amplifier allocates the signals to the correct loudspeakers.

Analogue surround system with four audio channels – front left, centre, right and rear surround (mono signal) [LCRS] that are encoded into two channels, Left Total and Right Total [Lt, Rt]. These two signals are separated on playback by a Pro Logic decoder to give LCRS.

The consumer version of the original analog Dolby multi-channel film sound format

The encoding process used to make material compatible with Dolby Pro-Logic. - Another surround format that came out before Dolby Prologic. It consists of only three channels: left/right front channels, and one surround channel.

A digital encoding system that combines four channels (Left, Center, Right and a limited bandwidth Surround channel) into two channels. These two channels can be summed together for mono playback, or played back as normal stereo. When the two channels are fed into the active Dolby Pro Logic decoder, the matrix is unfolded back into four channels again. The limited bandwidth Surround channel is reproduced through the Left Surround and Right Surround speakers. If the matrix is fed into a passive decoder, then only the stereo signal plus the surround channel is unfolded.

Dolby Surround was the earliest consumer version of Dolby's multichannel analog film sound format Dolby Stereo.