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Two systems that use height channels, Dolby Pro Logic IIz and DTS Neo:X, which matrixes a front left and front right height out of the front left and front right channels. According to Dolby, non-directional ambient effects such as rain and wind are mapped to the height channels. [1] This is similar to what is mapped to rear surround channels.
Dolby Pro Logic is a surround sound processing technology developed by Dolby Laboratories, designed to decode soundtracks encoded with Dolby Surround. The terms Dolby Stereo and LtRt ( Left Total , Right Total ) are also used to describe soundtracks that are encoded using this technique.
DTS Neo:X reconstructs 2.1, 5.1, 6.1, or 7.1 sources to 11.1 front height and width channel systems. Dolby's Pro Logic IIz's system adds only front height channels to the 7.1 configuration. Neo:X also matrix downmixes 11.1 sources to 5.1 or 7.1 channel systems.
Dolby Headphone is a technology developed by Lake Technology (Australia), that later sold marketing rights to Dolby Laboratories, sometimes referred to as Mobile Surround, which creates a virtual surround sound environment in real-time using any set of two-channel stereo headphones.
Dolby Surround, Dolby Pro Logic, Dolby Pro Logic II, Dolby Pro Logic IIx, and Dolby Pro Logic IIz: these decoders expand sound to a greater number of channels. All can decode surround sound that has been matrixed into two channels; some can expand surround sound to a greater number of speakers than the original source material.
Most common loudspeaker configuration for 5.1; used by Dolby Digital, SDDS, DTS, THX, and Dolby Pro Logic II. The white square in the center of the diagram depicts the low-frequency speaker. Each black square depicts a loudspeaker. The center speaker in the top line of the diagram is used for dialogue.
Of the two, Dolby SVA is by far the more significant, bringing high-quality stereo sound within the reach of virtually every cinema. Though 6-track magnetic stereo had been used in Cinerama films since 1952, and Fox had introduced 4-track stereo magnetic sound as part of the CinemaScope system in 1953, the technology had proved to be expensive and unreliable.
[1] [2] In addition, with the advent of Dolby Pro Logic IIz and DTS Neo:X, 7.1 surround sound can also refer to 7.1 surround sound configurations with the addition of two front height channels (LH and RH) positioned above the front channels or two front wide channels positioned between the front and surround channels. [3] [4]
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