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Digital Sound, the successor of Optical Surround was created in January of 2002. It's a 5.1 surround sound format which is only available on DVDs. However, when HD-DVD and Blu-Ray Disc were gaining fame, Digital Sound branched out it's HD sound format, Digital RealD (Digital RD for short). The company also branched out other brands, featuring DigiAnime Sound, Digital Sound Plus (experimental 7.1 sound format for DVDs) and DigiGaming Sound.