Patent ID: 7675577

Claim:
A device for automatically changing a broadcast channel of a vehicle television with a diversity antenna, the device comprising: an antenna switching unit connected with the diversity antennas and switching one of the diversity antennas under a predetermined control; a tuner for receiving a radio broadcast signal through the switched antenna, and detecting a broadcast signal for a predetermined broadcast channel under a predetermined control; an image processor for detecting an image signal from the broadcast signal; an audio processor for detecting an audio signal from the broadcast signal; an image signal level detector for detecting a signal level of the image signal; an audio signal level detector for detecting a signal level of the audio signal; a storage unit for storing regional broadcast channel information for each broadcasting station, a channel change history, a value of number of switching times depending on a switching control operation, first and second reference levels for each of the image signal and the audio signal, and a value of a reference number of switching times; and a controller for controlling the antenna switching unit to switch one of a plurality of the diversity antennas, counting and storing the number of switching times in the storage unit, checking a quality of the broadcast signal and, when it is determined that the quality is less than a predetermined reference level, deciding a desired broadcast channel with reference to the regional broadcast channel information for each broadcasting station, and controlling the tuner to change the broadcast channel into the decided broadcast channel.