A type of Dolby Surround decoder with improved performance over standard Dolby Surround decoding. Specifically, Pro Logic decoding provides greater channel separation and a center-speaker output. A Dolby Pro Logic decoder takes in a 2-channel, Dolby Surround–encoded audio signal and splits those signals up into left, center, right, and surround channels. Nearly all A/V receivers and A/V controllers include Dolby Pro Logic decoders.

advanced surround sound system for the home using two front speakers, two rear-channel speakers for ambiance reproduction and a front center channel speaker for dialog and "logic steering".

Four channel audio system (left, right, center, rear) to produce multi channel sound as heard in cinemas. Decodes audio signal actively to position the sound.

This form of sound has overshadowed the Dolby Surround. This sound system is a four channel surround system that is available on most any format, television broadcasts, vhs, and dvds. It sends the sound out of four channels to create a feeling that you are surrounded by the sound. It uses Front left, Front Right, Front center and 2 rear mono channel speakers.

A technology which uses a matrix process to create four channels of audio information (left, center, right and mono surround) from a two channel source, producing a surround sound environment.

An earlier form of surround sound. Four separate signals are encoded in a 2-channel recording and re-separated by the processor into left, centre, right and surround channels. The surround channel is usually fed to 2 speakers at the rear. (Dolby and Pro-Logic are registered trademarks of Dolby Laboratories Inc.) (See also Dolby Surround)

An audio decoding system that processes stereo audio signals into 4-channel (Pro Logic) or 5.1-channel (Pro Logic II) surround sound. (see Dolby Digital)

A 4-channel audio system from Dolby Laboratories, with discrete front, center, and rear channels, and a shared channel for use by rear left and right.

The most common surround sound system in use today. It is a four channel analog system (front right, center, left and rear mono) that is encoded onto almost all VCR movies today as well as many television shows.

An active matrix decoder for Dolby® Surround ( Lt, Rt) signals outputting four audio channels (left, center, right and surround). See: Matrix Encode/Decode, Dolby® Surround, Dolby Pro Logic® II.

Rather than producing surround sound from 5+ discreet channels, as later surround sound formats like Dolby Digital do, the surround information is synthesized from a 2-channel source. Since it is often used as a default format (when a 2-channel source is sensed as the input) newer, improved versions are still being developed.

When a provider wants the sound accompanying an image to be surround, it has to be recorded and coded with five distinct channels. What Dolby Pro Logic does is takes audio that was not recorded with the intention of surround sound and extrapolates what it would sound like if it had been. This is in effect a mimic of surround sound that, while not the real thing, still sounds remarkable.

Surround sound standard from Dolby Laboratories for the playback of movie soundtracks in the home. The system utilizes five loudspeakers - two main, two rear, and a center and a decoder to properly steer the signal to its appropriate channel.

Four channel “home-theatre” sound reproduction.

An enhancement of the Dolby Surround decoding process. Pro Logic decoders derive left, center, right, and a mono surround channel from two-channel Dolby Surround–encoded material via matrix techniques.

4:2:4 matrix technology, when applied to domestic formats such as video, broadcast, and DVD.

A system that takes an encoded two-channel stereo signal and converts it to four channels: left, center, right, and monophonic, frequency-limited surround.

The technique (or the circuit which applies the technique) of extracting surround audio channels from a matrix-encoded audio signal. Dolby Pro Logic is a decoding technique only, but is often mistakenly used to refer to Dolby Surround audio encoding.

Dolby Pro Logic (known as Dolby Surround in the theaters) is based on the use of an amplitude-phase matrix. This is a method of encoding four channels of information into two tracks of stereo media and then decoding them back into four channels for playback. DTH: Direct to home. Official term used by the Federal Communications Commission industry to refer to the satellite television and broadcasting industries.

A surround system where a 4-channel audio track is recorded as 2 channels and then is restored to 4 channels for play. The surround channel is monaural and can reproduce up to 7 kHz.

Pro Logic processing can be found on almost all home theater receivers. It delivers 4-channel playback of Dolby Surround-encoded stereo sources (primarily VHS tapes and stereo TV broadcasts). Pro Logic includes a center channel for on-screen sound; front left and right channels for sound that moves with the action; and a limited-bandwidth mono surround channel sent to the left and right surround speakers to provide ambience and sound effects.

The consumer equivalent of a theater’s Dolby Stereo, it creates four variable-frequency sound channels from a two-channel source.

Sometimes abbreviated DPL, an enhanced version of Dolby Surround Sound that employs analog or digital "steering" circuitry to enhance surround effects and also provide a signal for a center-channel speaker. See also Steering.

Dolby Pro Logic is a surround sound processing technology designed to decode soundtracks encoded with Dolby Surround. Dolby Surround Stereo was originally developed by Dolby Laboratories in 1976 for analog cinema sound systems. The format was adapted for home use in 1986 as Dolby Surround which was then replaced by the newer and improved Pro Logic system.