Patent ID: 6108052
Filing Date: 2000-08-22
Classification: H04N

Abstract:
An automatic tuning apparatus comprising tuner means tune-selecting a prescribed channel from broadcast electric waves including at least a video signal, video signal processing means receiving said video signal being outputted from said tuner means and separating a synchronizing signal being included in said video signal, AFT detection means detecting presence/absence of a broadcasting station by a signal received from said tuner means, tuning control means receiving said synchronizing signal from said video signal processing means and an AFT signal from said AFT detection means for controlling a tuning operation of said tuner means, and memory means being connected to said tuning control means for storing data being related to at least the tuning frequency of said tuner means,said automatic tuning apparatus comprising:synchronizing signal discrimination means receiving said synchronizing signal from said video signal processing means and counting the pulse number of said synchronizing signal per second for discriminating the video signal system of said video signal in response to said pulse number and outputting the result of said discrimination as a synchronizing signal discrimination signal, andtuning mode switching means receiving said synchronizing signal discrimination signal for outputting a tuning mode switching signal for changing the tuning mode of said tuner means in response to said signal system of said video signal and supplying said synchronizing signal discrimination signal to said tuning control means,the tuning mode of said tuner means being automatically changed in response to said signal system of said video signal, said tuning mode of said tuner means being stored in said memory means along with said data being related to the tuning frequency through said tuning control means.