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'''Dolby SR-D''', also called '''Dolby Digital''' is an optical digital format introduced in 1992. "SR-D" refers to the fact that all prints with Dolby Digital tracks are also equipped with analog [[Dolby SR|SR]] tracks.
'''Dolby SR-D''', also called '''Dolby Digital''' is an optical digital format introduced in 1992. Nearly all prints with Dolby Digital tracks also have [[Dolby SR|SR]] tracks.  


SR-D is encoded with six discrete channels of digital sound: Left, Center, Right, Left Surround, Right Surround, and Subwoofer. SR-D EX offers a seventh, "Rear-Surround" channel which is matrix encoded into the Left and Right Surround channels.  
SR-D is encoded with six discrete channels of digital sound: Left, Center, Right, Left Surround, Right Surround, and Subwoofer. SR-D EX offers a seventh, "Rear-Surround" channel which is matrix encoded into the Left and Right Surround channels.