Patent ID: 8185071

Claim:
A tuner module comprising: a filter to reduce a signal level outside a frequency band of a selected channel in an input radio frequency signal of terrestrial television broadcasting; a local oscillation circuit to oscillate a local oscillation signal; a mixing circuit to mix the radio frequency signal in which the signal level outside the frequency band of the selected channel is reduced by the filter and the local oscillation signal oscillated by the local oscillation circuit to downconvert the radio frequency signal to an intermediate frequency signal; a control circuit to control a local oscillation frequency of the local oscillation signal oscillated by the local oscillation circuit; wherein the control circuit adjusts the local oscillation frequency to a value that suppresses an effect of a disturbance wave from other channels within a frequency band of the intermediate frequency signal of the selected channel; a memory to store frequency information of the input radio frequency signal of terrestrial television broadcasting; and a tuning circuit, wherein, when the tuning circuit sets the selected channel when the local oscillation frequency is initialized to a value higher than a center frequency of the selected channel, the control circuit adjusts the local oscillation frequency to a value lower than the center frequency of the selected channel when the control circuit determines that there is broadcasting in a channel next higher than the selected channel with reference to the frequency information, the channel next higher than the selected channel having a frequency higher than the channel frequency of the selected channel.