In a receiver, immediately after the channel-up key or channel-down key is operated, the receiver 1 starts a tuning motion of tuning in to a program which is being broadcast by the virtual channel number corresponding to the operation. When the channel-up key or channel-down key is operated, if it is...http://www.google.com/patents/US7084930?utm_source=gb-gplus-sharePatent US7084930 - Digital receiver
