Editing Dolby Pro Logic (section)

==Dolby Pro Logic II==
{{infobox brand
|name           = Dolby Pro Logic II
|logo           = Dolby Pro Logic II.svg
|logo_size      = 120px
|image          = 
|type           = Surround sound
|currentowner   = [[Dolby Laboratories]]
|origin         = United States
|introduced     = 2000
|discontinued   =
|markets        = Worldwide
|website        = [https://www.dolby.com/ Dolby official website]
|related        = [[Dolby Digital]]<br>[[Dolby Stereo]]
}}
[[File:Dolby-Surround-Pro-Logic-II.svg|thumb|120px|Older logo, before Dolby updated their overall logo design.]]
In 2000, Dolby introduced '''Dolby Pro Logic II''' (DPL II), an improved implementation of Dolby Pro Logic created by [[Jim Fosgate]].<ref>{{cite web |last=Scarpelli |first=Paul |date=2015-03-03 |title=History of Surround Sound Processing: The Battle for Dolby Pro Logic II |url=https://www.audioholics.com/audio-technologies/surround-sound-upmixer |access-date=March 17, 2017 |work=[[Audioholics]]}}</ref> DPL II processes any high-quality stereo signal source into five separate full frequency channels (right front, center, left front, right rear and left rear), while also decoding five channels from stereo signals encoded in traditional four-channel Dolby Surround. DPL II implements greatly enhanced steering compared to DPL, and as a result, offers an exceptionally stable sound field that simulates five-channel surround sound.

Because of the limited nature of the original Dolby Pro Logic encoding, many consumer electronics manufacturers introduced their own processing circuitry, such as the "Jazz", "Hall", and "Stadium" modes found on most common home audio receivers. DPL II forgoes this type of processing and replaces it with simple [[servomechanism|servo]] ([[negative feedback]]) circuits used to derive five channels. The extra channel content is extracted using the difference between the spatial audio content between two individual channels of stereo tracks or Dolby Digital encoded 5.1 channel tracks and outputs it appropriately.

In addition to five full-range playback channels, Pro Logic II introduced a Music mode that includes optimized channel delays and adds user controls to—for example—adjust apparent sound stage width.

Pro Logic II systems also have a mode designed specifically for [[video game]]s which is used in games for [[PlayStation 2]], [[GameCube]], and [[Wii]] as an alternative to digital surround formats such as [[Dolby Digital]] or [[DTS (sound system)|DTS]]. Game mode is similar to Movie mode, except it redirects more bass to the LFE channel.
{{clear|right}}