Method for processing abnormal modulation signal and receiver with abnormal modulation signal compensation capability

A method for processing an abnormal modulation signal and a receiver having an abnormal modulation signal compensation function are provided to detect a high-deviation mode automatically in which a broadcasting signal is abnormally modulated and change demodulation parameters automatically in correspondence to a detected modulation mode, thereby reliably processing the abnormally modulated broadcasting signal. A method for processing an abnormal modulation signal comprises the following steps of: demodulating an analog input signal modulated according to modulation parameters by using demodulation parameters corresponding to the modulation parameters to create a baseband signal; sampling the baseband signal at a predetermined sampling rate; counting the number of samples in which a signal level is higher than a threshold level for a predetermined detection window(S310); and determining whether the analog input signal is modulated based on a result that the number of samples is bigger than a first number.