| 摘要 |
<p>An AFT optimizing method, apparatus thereof and an AFT method for a broadcast receiving system. A detecting section receives a tuner input signal and detects maximum and minimum voltages of an AFT signal, an adding section adds the maximum and minimum voltages of the AFT signal, an attenuating section attenuates an added signal and outputs an attenuated signal, a comparing section compares the attenuated signal with an AFT reference voltage transmitted from an outside thereof and outputs a comparing signal, and a data processing section transforms the comparing signal into a digital signal and stores the digital signal into a memory. At an initial state, an AFT voltage deviations and times about all channels are optimized and stored in the memory. During a channel switch, the latest stored AFT optimal data is connected, an optimal signal of a selected channel is detected and the AFT is carried out so that the channel switch is quickly carried out and a swing of an image occurring during the channel switch is avoided. <IMAGE></p> |
