Receiving apparatus

A receiving apparatus comprising:

• a frequency fluctuation detection unit configured to detect a frequency difference between a frequency of a received signal and a frequency of a desired signal to be received;
• a first undesired level detection unit including first and second band-pass filters having passbands whose band widths are different from each other and whose centers are the frequency of the desired signal, the first undesired level detection unit configured to output as a first undesired level a difference in amplitude level between the signals having passed through the first and second band-pass filters in the received signals;
• one or a plurality of second undesired level detection units including third and fourth band-pass filters having passbands whose centers are the frequencies lower and higher by a predetermined frequency than the frequency of the desired signal, respectively, the one or the plurality of second undesired level detection units configured to output amplitude levels of signals having passed through the third and fourth band-pass filters in the received signals as second and third undesired levels, respectively, and output a sum of the second and third undesired levels as a fourth undesired level;
• and
• a determination unit configured to determine whether or not a state is an undesired state where an adjacent undesired signal is present according to the fourth undesired level if an absolute value of the frequency difference is equal to or greater than a predetermined reference value, the determination unit further configured to select any one of the first to third undesired levels to be outputted according to at least one of the frequency difference and the fourth undesired level if determining that the state is the undesired state.