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2. Quadraphonic sound - Wikipedia

   en.wikipedia.org/wiki/Quadraphonic_sound

   Quadraphonic sound. Quadraphonic (or quadrophonic and sometimes quadrasonic) sound – equivalent to what is now called 4.0 surround sound – uses four audio channels in which speakers are positioned at the four corners of a listening space. The system allows for the reproduction of sound signals that are (wholly or in part) independent of one ...

3. Dolby Stereo - Wikipedia

   en.wikipedia.org/wiki/Dolby_Stereo

   The matrix was then extended to provide a fourth channel for surround loudspeakers, allowing for a 4-channel system with the same speaker layout as the CinemaScope 4-track magnetic stereo system of the 1950s, but at a far lower cost. Dolby Stereo, as this 4-channel system was now branded, was first used in 1976's A Star is Born. From spring ...

4. Matrix decoder - Wikipedia

   en.wikipedia.org/wiki/Matrix_decoder

   Matrix decoding is an audio technology where a small number of discrete audio channels (e.g., 2) are decoded into a larger number of channels on play back (e.g., 5). The channels are generally, but not always, arranged for transmission or recording by an encoder, and decoded for playback by a decoder. The function is to allow multichannel audio ...

5. 4-6-4-4 - Wikipedia

   en.wikipedia.org/wiki/4-6-4-4

   4-6-4-4. In Whyte notation, a 4-6-4-4 is a railroad steam locomotive that has four leading wheels followed by six coupled driving wheels, a second set of four driving wheels and four trailing wheels. The sole example of this arrangement was the PRR Q1. This locomotive was essentially a prototype in the development of the PRR Q2, a 4-4-6-4.

6. Stereo Quadraphonic - Wikipedia

   en.wikipedia.org/wiki/Stereo_Quadraphonic

   Read mechanism. phono cartridge. Usage. Audio storage. SQ Quadraphonic ("Stereo Quadraphonic") [1] was a matrix 4-channel quadraphonic sound system for vinyl LP records. It was introduced by CBS Records (known in the United States and Canada as Columbia Records) in 1971. Many recordings using this technology were released on LP during the 1970s.

7. Dolby Digital - Wikipedia

   en.wikipedia.org/wiki/Dolby_Digital

   Dolby Digital, originally synonymous with Dolby AC-3 (see below), is the name for a family of audio compression technologies developed by Dolby Laboratories. Called Dolby Stereo Digital until 1995, it is lossy compression (except for Dolby TrueHD). The first use of Dolby Digital was to provide digital sound in cinemas from 35 mm film prints.