Channel selecting unit

A channel selecting unit comprising:

• a plurality of tuners each outputting an intermediate frequency based on a tuning instruction signal corresponding to a channel;
• a plurality of VIF circuits each amplifying an intermediate frequency signal outputted from each tuner and outputting an AFT voltage;
• a video signal processing circuit for separating a synchronous signal from the amplified intermediate frequency signal outputted from each VIF circuit, and outputting the synchronous signal;
• and
• a control circuit for outputting the tuning instruction signal to each tuner and subjecting each tuner to an AFT control based on the AFT voltage;
• wherein the control circuit is comprised of synchronization detecting means for detecting the presence or absence of synchronization based on the synchronous signal which is separated from the intermediate frequency signal outputted from a specified tuner, storage means for storing therein tuning frequency data and an AFT voltage value for every channel when the synchronization detecting means detects the presence of synchronization and the AFT voltage falling within a predetermined range, and channel select control means for reading out the tuning frequency data and the AFT voltage value of the pertinent tuner from the storage means based on a channel switching signal relating to a tuner other than the specified tuner, thereby implementing a channel selecting operation.