Apparatus and method for extending pulling range of automatic fine tuning of television receiver.

摘要

An apparatus and a method for extending a pulling range of automatic fine tuning of a television receiver. An initial tuning voltage is applied to a tuner when a channel switching operation is performed or the television receiver is powered on. The tuning voltage to the tuner is controlled by bands as a result of comparison of an automatic fine tuning voltage of a specified channel with a first predetermined reference voltage. If the automatic fine tuning voltage is higher than the first predetermined reference voltage, it is checked whether the automatic fine tuning voltage is within a desired range. The tuning voltage to the tuner is controlled by the bands if the automatic fine tuning voltage is not within the desired range, to maintain the automatic fine tuning voltage within the desired range. Presence of a synchronous signal of the specified channel is checked if the automatic fine tuning voltage is within the desired range. If the synchronous signal of the specified channel is present, the tuning voltage to the tuner is controlled by the bands to maintain the automatic fine tuning voltage within the desired range. If the synchronous signal of the specified channel is not present, the initial tuning voltage is applied to the tuner to continue to check the presence of the synchronous signal.