Paul D Vancelette: Multi-channel television system with viewer-selectable video and audio. General Instrument Corporation, Barry R Lipsitz, Ralph F Hoppin, April 13, 1999: US05894320 (264 worldwide citation)

A television viewer can select among a choice of available camera angles and audio feeds when viewing a sporting event such as a football game without changing the television channel. Audio, video and control data is transmitted in a packetized data stream with control data providing a pre-assigned ...