A video signal processor is used to receive programs in the form of a composite
video signal which incorporates a video broadcast channel, a main audio channel
and an additional audio channel. The main audio channel may carry a standard audio
track for the program while the additional audio channel carries a different audio
track, such as dialogue in a foreign language, DVS audio track, or a modified audio
track that has been changed from the main audio track slightly. The video signal
processor selects one of the audio tracks as the active audio track based on the
contents of the additional audio channels and/or a viewers' preferences. The video
signal processor may be a stand-alone device, or may be incorporated into a TV
receiver, VCR, DVD player, etc.
