Patent ID: 6940923

Claim:
A demodulating device for demodulating a modulated signal, comprising: a digital signal generating portion for synchronously detecting a modulated input signal and then subjecting the input signal to A/D conversion to generate digital signals corresponding to respective phase axes; a timing recovery portion for extracting symbol timing of the digital signals to recover the timing; a carrier recovery portion for setting a gain for a phase difference between the timing-recovered digital signals in accordance with a phase noise correction signal, and rotating symbols in a direction to suppress phase noise in accordance with an oscillation signal generated based on the gain, to recover a carrier; and a phase noise correction portion for outputting the phase noise correction signal which takes a value equal to an increase of the phase difference when the phase difference has increased on a positive side, and which takes a value obtained by multiplying an increase of the phase difference by “−1” when the phase difference has increased on a negative side.