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Dolby Surround 7.1 (sometimes called Dolby 7.1 surround sound) is a sound system by Dolby Laboratories which delivers theatrical 7.1 surround sound to movie-goers. It is the most recent addition to a family of audio compression technologies developed by Dolby known as Dolby Digital .
Dolby Atmos home theaters can be built upon conventional 5.1 and 7.1 layouts. For Dolby Atmos, the nomenclature differs slightly by an additional number at the end, that represents the number of overhead or Dolby Atmos enabled speakers: a 7.1.4 Dolby Atmos system is a conventional 7.1 layout with four overhead or Dolby Atmos enabled speakers.
However, whereas a 5.1 surround sound system combines both surround and rear channel effects into two channels (commonly configured in home theatre set-ups as two rear surround speakers), a 7.1 surround system splits the surround and rear channel information into four distinct channels, in which sound effects are directed to left and right ...
Dolby Digital EX, for example, has a sixth full-range channel incorporated into the two rear channels with a matrix. This is expressed: This is expressed: 3 front channels + 2 rear channels + 3 channels reproduced in the rear in total + 1 LFE channel = 3/2:3.1
Dolby AC-4 can have up to 5.1 core audio channels which all Dolby AC-4 decoders are required to decode. [1] Additional audio channels may be encoded as side signals which Dolby AC-4 decoders can optionally support which would allow for the delivery of 7.1.4 channel audio. [1] Side signals may also contain audio objects. [1]
Before 1996 it was marketed as Dolby Surround AC-3, Dolby Stereo Digital, and Dolby SRD. [ 19 ] The most elaborate mode of this codec in common use involves five channels for normal-range speakers ( 20 Hz – 20,000 Hz ) (right, center, left, right surround, left surround) and one channel ( 20 Hz – 120 Hz allotted audio) for the subwoofer ...
In the 2020s, a home cinema system typically uses a large projected image from a video projector or a large flat-screen high-resolution HDTV system, a movie or other video content on a DVD or high-resolution Blu-ray disc, which is played on a DVD player or Blu-ray player, with the audio augmented with a multi-channel power amplifier and ...
Instead, the IMAX system specifies a separate six-channel 35 mm (1.4 in) magnetic film, recorded and played back on a film follower locked to picture, just as Vitaphone had been (utilizing 16-inch 33 1/3 RPM electrical transcription discs) in the early 20th century, and was the same technology used to provide the 7-channel soundtrack ...