AUDIO SIGNAL DEMODULATION DEVICE

摘要

An FM demodulation device (200) includes: an analog-digital conversion unit (201) for converting a modulated analog signal to a digital signal; an orthogonal conversion unit (202) for converting the digital signal converted by the analog-digital conversion unit (201) into two base band signals orthogonal to each other; a band limit unit (205) for limiting a frequency component exceeding the maximum frequency of an FM modulated wave from the two base band signals converted by the orthogonal conversion unit (202); a detection unit (206) for acquiring an FM demodulated signal from the two base band signals having a band limited by the band limit unit (205); and a noise suppression unit (204) for suppressing a pulse noise contained in a signal inputted to the band limit unit (205).