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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.
It uses five full-bandwidth channels and one low-frequency effects channel (the "point one"). [2] Dolby Digital, Dolby Pro Logic II, DTS, SDDS, and THX are all common 5.1 systems. 5.1 is also the standard surround sound audio component of digital broadcast and music. [3]
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.
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 Virtual Speaker: simulates 5.1 surround sound in a setup of two standard stereo speakers. [27] 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 ...
Dolby Surround – Marketed consumer name of the theatrical Dolby Stereo analog surround format; Dolby Pro Logic – Reference active 2:4 matrix decoding system used on Dolby Stereo soundtracks and Dolby Surround [after 1987] Dolby TrueHD – lossless codec for HD DVD and Blu-ray Disc
These are Dolby Digital EX and DTS ES. Dolby introduced Dolby Pro Logic II to allow stereo sources to play back as if they were encoded in surround sound. DTS introduced a similar technology, Neo:6. These decoders have become common on most current receivers. As the number of playback channels was increased on receivers, other decoders have ...
A Dolby noise-reduction system, or Dolby NR, is one of a series of noise reduction systems developed by Dolby Laboratories for use in analog audio tape recording. [1] The first was Dolby A, a professional broadband noise reduction system for recording studios that was first demonstrated in 1965, but the best-known is Dolby B (introduced in 1968), a sliding band system for the consumer market ...
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