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HandBrake and FFmpeg are capable of downmixing Dolby Digital AC-3 5.1 to Lt/Rt stereo tracks compatible with Dolby Pro Logic I & II decoders. SurCode for Dolby Pro Logic II is a Dolby-certified software encoder and decoder available in plug-in formats for DAWs and as a standalone application.
Dolby Stereo and Dolby Surround are also known as Dolby MP, Dolby SVA and Pro Logic. Dolby SVA matrix is the original name of the Dolby Stereo 4:2:4 encoding matrix. The term "Dolby Surround" refers to both the encoding and decoding in the home environment, while in the theater it is known "Dolby Stereo", "Dolby Motion Picture matrix" or "Dolby ...
Inventing surround sound for television, Dolby Pro Logic II, high-end SQ 4-2-4 analog quad audio decoding James M. Fosgate (December 5, 1937 – December 7, 2022) [ 1 ] was an American inventor, engineer and businessman.
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.
The SSM-2125 is a complete Dolby Stereo matrix decoder (except for the surround delay) on a single chip, it allowed domestic decoders which used the same logic system found in professional decoders to be marketed to the consumer. These decoders were thus named Dolby Pro Logic.
A 7.1 system's 2 rear speakers are mono. Neo:6 is a multi-band decoder, unlike Dolby Pro Logic II's broadband logic steering, meaning that the decoder can enhance more than one predominant signal at a time — provided each predominant signal lies in a different frequency band than the others.
Dolby used the Tate DES IC's in their theater processors until around 1986, when they developed the Pro Logic system. Unfortunately, delays and problems kept the Tate DES IC's from the market until the late 1970s, and only two consumer decoders were ever made that employed them: the Audionics Space & Image Composer and the Fosgate Tate II 101A.
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.