Before revision: Types of media and technologies Commercial surround sound media include videocassettes, DVDs, and SDTV broadcasts encoded as analog matrix Dolby surround compressed Dolby Digital and DTS, and lossless audio such as DTS HD Master Audio and Dolby TrueHD on HDTV Blu-ray Disc and HD DVD, which are identical to the studio master.
After revision: Types of media and technologies Commercial surround sound media include videocassettes, DVDs, and SDTV broadcasts encoded as analog matrix matrixed Dolby Surround compressed Dolby Digital and DTS, and lossless audio such as DTS HD Master Audio and Dolby TrueHD on HDTV Blu-ray Disc and HD DVD, which are identical to the studio master.