ITU-R BS.775-4 PDF

Digital TV has rapidly gained ground around the world. Several digital television broadcasting services have already been introduced in the terrestrial and in the satellite bands. As part of these digital broadcasting services, multichannel audio services are used or have been specified to enhance the directional stability of the frontal sound image and the sensation of spatial reality (ambience).

Recommendation ITU-R BS.775 recommends one universal multichannel stereophonic sound system with three front channels and two rear/side channels together with an optional low frequency effects (LFE) channel.