Abstract: When channel setup is carried out under poor receiving condition, the previous channel information that has been stored on a channel map in the channel setup carried out under normal receiving condition is replaced with the later channel information that is stored on the channel map including less acquired channel information formed in the channel setup carried out later. Existence of broadcast signal is judged only on channels other than channels that are registered based on the fact that the channels include a broadcast signal on a channel map stored in the previous channel setup, and the channel information of the broadcast signal detected later is registered additionally on the channel map in a flash memory as the channel including the broadcast signal.

Abstract: When channel setup is carried out later under poor receiving condition, the previous channel information that has been stored on a channel map in the channel setup carried out under normal receiving condition is replaced with the later channel information that is stored on the channel map including less acquired channel information formed in the channel setup carried out later. Existence of broadcast signal is judged only on channels other than channels that are registered based on the fact that the channels include a broadcast signal on a channel map stored in the previous channel setup, and the channel information of the broadcast signal detected later is registered additionally on the channel map in a memory means as the channel including the broadcast signal.

Abstract: A noise reduction circuit comprising: a high-pass filter for extracting the high-frequency component of an image signal; a coring circuit for extracting a faint signal component included in the extracted high-frequency component as noise; a low-pass filter for extracting the low-frequency component of the image signal; an adder for adding the cored high-frequency component and the low-frequency component extracted by the low-pass filter; and a coring control circuit which detects the level of a luminance signal and controls the coring range of the coring circuit according to the level of the luminance signal.