noun
Technical term in computing and telecommunications for a device that extracts a signal from a modulated carrier wave.
復調機は、受信した変調信号から元のデータを取り出す装置です。
A demodulator is a device that extracts the original data from a received modulated signal.
Compound of 復調 (demodulation) + 機 (machine, device). The term is a direct technical translation of the English 'demodulator'.