Dolby Pro Logic



Dolby_Pro_Logic.gif

Dolby Pro Logic is the surround sound codec that really put surround sound for home theater on the map. Powered by the boom in popularity of VHS in the late 1980s, Dolby Pro Logic brought a reasonable, non-discrete surround track to people's living rooms. It's fair to say that Pro Logic gave people reason to invest in their first home theater receivers, AV preamps or even standalone surround sound processors.

Dolby Pro Logic is a matrixed format. This means that there are two stereo channels (on the VHS tape) and within these two channels exists the data to create a center channel and single rear surround channel (which is split by the receiver to two speakers). The advantage of this method is that non-Pro Logic devices (a television, say) can still read the stereo data, and not have any issues because doesn't "see" the matrixed information. The downside is a lack of truly discrete surround or LFE channels.

In 2000, Dolby released Pro Logic II, which creates 5.1-channels from 2-channel stereo signals. Though not nearly as good as a true discrete soundtrack like you'd get from Dolby Digital or DTS, PLII is still very popular to get all the channels going in a surround sound system with music or stereo movie.

The latest incarnation is Pro Logic IIz, which creates height channels.

While most AV preamps can decode Dolby Pro Logic today, it is not considered the best format for surround sound, as there are both lossless and lossy codec, such as Dolby TrueHD, DTS Master Audio and even Dolby Digital that do a better job with surround effects, specifically providing less compression to the sound and allowing discrete audio for each of the 7.1 channels in a system.


Newest

Sep 15
Hisense Highlights 2020 TV Lineup at CEDIA 2020 The L5 Series, H9G Quantum Dot Series, and H8G Quantum Series run on the Android TV operating system. The H9G and H8G both include Dolby Atmos and Dolby Vision
Hisense Highlights 2020 TV Lineup at CEDIA 2020

Sep 15
Klipsch Holding, LLC Changes Name to Premium Audio Company, LLC The renamed company will consist of two subsidiaries, each comprised of several brands
Klipsch Holding, LLC Changes Name to Premium Audio Company, LLC

Sep 15
Sennheiser Celebrates 75th Anniversary with Limited Edition HD 800 S Release The very limited-edition HD 800 S Anniversary Edition headphones include the hallmark features of the original HD 800 S
Sennheiser Celebrates 75th Anniversary with Limited Edition HD 800 S Release

Sep 14
Bob Stuart Awarded Academy of Engineering Prince Philip Medal MQA creator and Meridian Audio co-founder is the first audio engineer to win the award in its 20-year history
Bob Stuart Awarded Academy of Engineering Prince Philip Medal

Sep 14
Vanco Announces Two New AV Recording Products The Vanco HDCAPT1 and PulseAudio PACAPT1 enable HDMI video and analog audio content, respectively, to be recorded and livestreamed
Vanco Announces Two New AV Recording Products