ITU-R - International Telecommunication Union/ITU Radiocommunication Sector
适用范围
Introduction ITU-R has developed Recommendation ITU-R BS.775 for multichannel stereophonic sound system with and without accompanying picture. Multichannel stereo as well as 2-channel stereo audio services are widely used as part of digital broadcasting services. Recommendation ITU-R BS.775 specifies a hierarchy of compatible multichannel sound systems to enhance the directional stability of the frontal sound image and the sensation of spatial reality (ambience)@ and each loudspeaker is set at the same height as a listener's ears. Some television applications with higher resolution imagery and large screen digital imaginary (LSDI) application @ both providing wider viewing angle@ may need multichannel stereophonic sound systems that can reproduce the sound sources@ which are localized at a higher position over the listener and a lower position below the screen@ and vertical movements of the sound sources. Several multichannel stereophonic sound systems are currently applied or studied for higher resolution imagery@ and some of them have loudspeakers arranged above and below the viewer. There would be value in continued studies in this area for future broadcasting applications in order to evolve beyond the current 5.1 channel sound system. This Report contains information on the subject of ?C Multichannel sound technology in home and broadcasting applications@ beyond the current 5.1 channel sound system specified in Recommendation ITU-R BS.775.