The smaller the file, the easier it is to distribute. Efficient 5.1 Sound At its core, Dolby Digital technology represents a very efficient way for movie studios, television networks, and other content providers to compress the size of multichannel audio files without impairing the sound quality. Even many video games feature Dolby Digital surround sound. Cinema, TV, DVDs, and Games The same audio technology that revolutionized the cinema enables the sound in all DVDs and US HDTV broadcasts.It expands the left and right traditional stereo channels to deliver an enveloping 360 degrees of sound. 5.1 Multichannel Sound With 5.1 channels of high-quality audio, Dolby Digital places you in the center of the action.Dolby Digital 5.1 has evolved into ™, delivering up to 7.1 channels of surround sound in devices ranging from TVs to mobile phones.