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• Dolby_Pro_Logic abstract "Dolby Pro Logic is a surround sound processing technology developed by Dolby Laboratories, designed to decode soundtracks encoded with Dolby Surround. Dolby Stereo was originally developed by Dolby in 1976 for analog cinema sound systems. The format was adapted for home use in 1982 as Dolby Surround when HiFi capable consumer VCRs were introduced; it was then replaced by the newer and improved Pro-Logic system in 1987. However, the term \"Dolby Surround\" is still used to describe the encoding technology or matrix-encoded soundtrack, whereas Pro Logic refers to the decoding technology and processor. It is the domestic equivalent of the theatrical Dolby Stereo technology used in movie cinemas in the 1970s and '80s. The two technologies are mostly identical but a change in marketing was needed so as not to confuse cinema stereo which is at least four channels of audio with home stereo which is only two. Thus Dolby Pro Logic is the consumer version of theatrical Dolby Stereo.Dolby Surround/Pro Logic is based on basic matrix technology. When a Dolby Surround soundtrack is created, four channels of sound are matrix-encoded into an ordinary stereo (two channel) sound track. The centre channel is encoded by placing it equally in the left and right channels; the rear channel is encoded using phase shift techniques, typically an out of phase stereo mixdown. A Pro Logic decoder/processor \"unfolds\" the sound into the original 4.0 surround—left and right, center, and a single limited frequency-range (7 kHz low-pass filtered) mono rear channel—while systems lacking the decoder play back the audio as standard stereo.A Pro-Logic decoder also uses 'Steering Logic', which drives amplifiers, to raise or lower the output volume of each channel based on the current dominant sound direction. For example, while a mono signal is played, the strong correlation to the center channel triggers the output volume of the left, right and surround channels to be lowered. This increases the channel separation achievable, to around 30 decibels between channels. By careful tuning of the response of the amplifiers, the total amount of signal energy remains constant and is unaffected by the operation of the channel steering. Additionally the response time of the system to changes in sound direction is important as too fast a response results in a twitchy feel, while too slow a response leaves sounds coming from an inappropriate direction.In addition to 5db of noise processing, the surround channel is slightly delayed, so that any front channel sounds that leak into the surround channel arrive at the listener after the front channels, providing an illusion of greater separation.Although Dolby Surround was introduced as an analog format, all Dolby Digital decoders incorporate a digitally implemented Dolby Surround Pro Logic decoder for digital stereo signals that carry matrix-encoded Dolby Surround. One of the first was the MSP400 surround sound receiver and amplifier by RCA for their high-end Dimensia brand. It was released in 1987 for the Digital Command Component System.".
• Dolby_Pro_Logic thumbnail Dolby_Pro_Logic_II.svg?width=300.
• Dolby_Pro_Logic wikiPageExternalLink 208_Dolby_Surround_Pro_Logic_Decoder.pdf.
• Dolby_Pro_Logic wikiPageExternalLink www.dolby.com.
• Dolby_Pro_Logic wikiPageExternalLink history_4.html.
• Dolby_Pro_Logic wikiPageExternalLink dolby-surround.aspx.
• Dolby_Pro_Logic wikiPageExternalLink 209_Dolby_Surround_Pro_Logic_II_Decoder_Principles_of_Operation.pdf.
• Dolby_Pro_Logic wikiPageExternalLink lisguidtodol1.html.
• Dolby_Pro_Logic wikiPageID "432734".
• Dolby_Pro_Logic wikiPageLength "13077".
• Dolby_Pro_Logic wikiPageOutDegree "53".
• Dolby_Pro_Logic wikiPageRevisionID "697855477".
• Dolby_Pro_Logic wikiPageWikiLink 7.1_surround_sound.
• Dolby_Pro_Logic wikiPageWikiLink AV_receiver.
• Dolby_Pro_Logic wikiPageWikiLink Category:Dolby_Laboratories.
• Dolby_Pro_Logic wikiPageWikiLink Category:Film_sound_production.
• Dolby_Pro_Logic wikiPageWikiLink Category:Surround_sound.
• Dolby_Pro_Logic wikiPageWikiLink Center_channel.
• Dolby_Pro_Logic wikiPageWikiLink DTS_(sound_system).
• Dolby_Pro_Logic wikiPageWikiLink Dolby_Digital.
• Dolby_Pro_Logic wikiPageWikiLink Dolby_Digital_Plus.
• Dolby_Pro_Logic wikiPageWikiLink Dolby_Laboratories.
• Dolby_Pro_Logic wikiPageWikiLink Dolby_Stereo.
• Dolby_Pro_Logic wikiPageWikiLink Dolby_Surround.
• Dolby_Pro_Logic wikiPageWikiLink Dolby_TrueHD.
• Dolby_Pro_Logic wikiPageWikiLink FFmpeg.
• Dolby_Pro_Logic wikiPageWikiLink File:Dolby-Pro-Logic-IIx.svg.
• Dolby_Pro_Logic wikiPageWikiLink File:Dolby-Surround-Pro-Logic.svg.
• Dolby_Pro_Logic wikiPageWikiLink File:Dolby-Surround.svg.
• Dolby_Pro_Logic wikiPageWikiLink File:Dolby_Pro_Logic_IIz.svg.
• Dolby_Pro_Logic wikiPageWikiLink GameCube.
• Dolby_Pro_Logic wikiPageWikiLink HandBrake.
• Dolby_Pro_Logic wikiPageWikiLink Height_channels.
• Dolby_Pro_Logic wikiPageWikiLink Jim_Fosgate.
• Dolby_Pro_Logic wikiPageWikiLink Low-pass_filter.
• Dolby_Pro_Logic wikiPageWikiLink MPlayer.
• Dolby_Pro_Logic wikiPageWikiLink Matrix_decoder.
• Dolby_Pro_Logic wikiPageWikiLink Movie_theater.
• Dolby_Pro_Logic wikiPageWikiLink Negative_feedback.
• Dolby_Pro_Logic wikiPageWikiLink Out_Of_Phase_Stereo.
• Dolby_Pro_Logic wikiPageWikiLink Phase_(waves).
• Dolby_Pro_Logic wikiPageWikiLink PlayStation_2.
• Dolby_Pro_Logic wikiPageWikiLink RCA_Dimensia.
• Dolby_Pro_Logic wikiPageWikiLink Servomechanism.
• Dolby_Pro_Logic wikiPageWikiLink Stereophonic_sound.
• Dolby_Pro_Logic wikiPageWikiLink Surround_sound.
• Dolby_Pro_Logic wikiPageWikiLink Video_game.
• Dolby_Pro_Logic wikiPageWikiLink Videocassette_recorder.
• Dolby_Pro_Logic wikiPageWikiLink Wii.
• Dolby_Pro_Logic wikiPageWikiLink File:Dolby-Surround-Pro-Logic-II.svg.
• Dolby_Pro_Logic wikiPageWikiLink File:Dolby_Pro_Logic_II.svg.
• Dolby_Pro_Logic wikiPageWikiLinkText "5.1-channel Dolby Surround".
• Dolby_Pro_Logic wikiPageWikiLinkText "DPLII".
• Dolby_Pro_Logic wikiPageWikiLinkText "Dolby Pro Logic II".
• Dolby_Pro_Logic wikiPageWikiLinkText "Dolby Pro Logic IIx".
• Dolby_Pro_Logic wikiPageWikiLinkText "Dolby Pro Logic IIz".
• Dolby_Pro_Logic wikiPageWikiLinkText "Dolby Pro Logic".
• Dolby_Pro_Logic wikiPageWikiLinkText "Dolby Pro Logic#Dolby Pro Logic II".
• Dolby_Pro_Logic wikiPageWikiLinkText "Dolby Pro Logic#Dolby Pro Logic IIx".
• Dolby_Pro_Logic wikiPageWikiLinkText "Dolby Pro Logic#Dolby Pro Logic IIz".
• Dolby_Pro_Logic wikiPageWikiLinkText "Dolby Pro-Logic II".
• Dolby_Pro_Logic wikiPageWikiLinkText "Dolby matrix surround".
• Dolby_Pro_Logic wikiPageWikiLinkText "Dolby-2".
• Dolby_Pro_Logic wikiPageWikiLinkText "Pro Logic II".
• Dolby_Pro_Logic wikiPageWikiLinkText "Pro-Logic".
• Dolby_Pro_Logic wikiPageWikiLinkText "pro logic".
• Dolby_Pro_Logic wikiPageUsesTemplate Template:Clear.
• Dolby_Pro_Logic wikiPageUsesTemplate Template:Dolby_Laboratories.
• Dolby_Pro_Logic wikiPageUsesTemplate Template:Frac.
• Dolby_Pro_Logic wikiPageUsesTemplate Template:Redirect-distinguish.
• Dolby_Pro_Logic subject Category:Dolby_Laboratories.
• Dolby_Pro_Logic subject Category:Film_sound_production.
• Dolby_Pro_Logic subject Category:Surround_sound.
• Dolby_Pro_Logic type Company.
• Dolby_Pro_Logic type Company.
• Dolby_Pro_Logic type Laboratory.
• Dolby_Pro_Logic type Thing.
• Dolby_Pro_Logic comment "Dolby Pro Logic is a surround sound processing technology developed by Dolby Laboratories, designed to decode soundtracks encoded with Dolby Surround. Dolby Stereo was originally developed by Dolby in 1976 for analog cinema sound systems. The format was adapted for home use in 1982 as Dolby Surround when HiFi capable consumer VCRs were introduced; it was then replaced by the newer and improved Pro-Logic system in 1987.".
• Dolby_Pro_Logic label "Dolby Pro Logic".
• Dolby_Pro_Logic differentFrom Logic_Pro.
• Dolby_Pro_Logic sameAs Q1235354.
• Dolby_Pro_Logic sameAs Dolby_Pro_Logic.
• Dolby_Pro_Logic sameAs Dolby_Pro_Logic.
• Dolby_Pro_Logic sameAs Dolby_Pro_Logic.
• Dolby_Pro_Logic sameAs Dolby_Surround_Pro_Logic.
• Dolby_Pro_Logic sameAs Dolby_Pro_Logic.
• Dolby_Pro_Logic sameAs Dolby_Surround_Pro_Logic.
• Dolby_Pro_Logic sameAs Dolby_Pro_Logic.
• Dolby_Pro_Logic sameAs m.027wnk.
• Dolby_Pro_Logic sameAs Dolby_Pro_Logic.
• Dolby_Pro_Logic sameAs Dolby_Pro_Logic.
• Dolby_Pro_Logic sameAs Q1235354.
• Dolby_Pro_Logic wasDerivedFrom Dolby_Pro_Logic?oldid=697855477.
• Dolby_Pro_Logic depiction Dolby_Pro_Logic_II.svg.
• Dolby_Pro_Logic homepage www.dolby.com.
• Dolby_Pro_Logic isPrimaryTopicOf Dolby_Pro_Logic.