OFDM modulation signal demodulator, receiving apparatus, and receiving and displaying apparatus

An orthogonal frequency division multiplexing (OFDM) modulation signal receiving apparatus comprising:

• a demodulating part that receives an OFDM modulation signal and demodulates the received OFDM modulation signal;
• an autocorrelation calculating part that calculates an autocorrelation value of the OFDM modulation signal for each of a plurality of predetermined periods;
• an intra-interval total sum value calculating part that successively generates comparison result values, each representing a deviation of the autocorrelation value from a threshold value, and sums up the generated comparison result values at predetermined intervals to obtain an intra-interval total sum value for each of the predetermined intervals;
• and
• an output part that selects a piece of autocorrelation level data from a plurality of pieces of autocorrelation level data representing the obtained intra-interval total sum values and outputs the selected piece of autocorrelation level data.

An orthogonal frequency division multiplexing (OFDM) modulation signal receiving and displaying apparatus comprising:

• a demodulating part that receives an OFDM modulation signal and demodulates the received OFDM modulation signal;
• a decoding part that decodes the demodulated OFDM modulation signal;
• a display unit that provides a display based on the decoded signal;
• an autocorrelation calculating part that calculates an autocorrelation value of the OFDM modulation signal for each of a plurality of predetermined periods;
• an intra-interval total sum value calculating part that successively generates comparison result values, each representing a deviation of the autocorrelation value from a threshold value, and sums up the generated comparison result values at predetermined intervals to obtain an intra-interval total sum value for each of the predetermined intervals;
• and
• a selection notification part that makes an autocorrelation level notification on the basis of an autocorrelation level selected according to the obtained intra-interval total sum values.