| 主权项 |
1. An audio/video content receiver for receiving and decoding audio/video data signals modulated onto transmission channels as packetized transport streams, at least one transmission channel carrying non-viewing information, the receiver comprising:
a tuner arrangement capable of concurrently tuning to two or more transmission channels so as to output two or more respective packetized transport streams; a multiplexer configured to generate a composite data signal from received audio/video signals relating to required programmes for decoding, each packetized transport stream being identified in the composite data signal by a local identification value allocated to that packetized transport stream by the content receiver; a content decoder capable of concurrently decoding two or more audio/video programmes from the composite data signal; a detector configured to detect whether one or more of the transmission channels tuned by the tuner arrangement are not currently in use in respect of providing a programme for decoding for viewing by a user or for recording; a controller, responsive to a detection that a transmission channel is not currently in use, for controlling the tuner to tune that channel to a transmission channel carrying a packetized transport stream including non-viewing information; and a non-viewing information decoder for decoding the received non-viewing information, the non-viewing information decoder identifying packets of the non-viewing information, at least in part, by reference to the local identification value associated with the packetized transport stream carrying that non-viewing information. |
