Abstract: A demodulator includes: a demodulation section that outputs a demodulated signal demodulated from a modulated signal; an integration section 60a that integrates the demodulated signal; a zone detection section 60b that detects a replacement target zone in the demodulated signal based on an integrated signal output by the integration section; and a replacement section 60c that replaces a signal of the replacement target zone in the demodulated signal with a replacement target signal. A noise can be removed by integrating the demodulated signal by the integration section, and detecting a replacement target zone in the demodulated signal by the zone detection section based on the integrated signal.

Abstract: A demodulator includes: a demodulation section that outputs a demodulated signal demodulated from a modulated signal; an integration section 60a that integrates the demodulated signal; a zone detection section 60b that detects a replacement target zone in the demodulated signal based on an integrated signal output by the integration section; and a replacement section 60c that replaces a signal of the replacement target zone in the demodulated signal with a replacement target signal. A noise can be removed by integrating the demodulated signal by the integration section, and detecting a replacement target zone in the demodulated signal by the zone detection section based on the integrated signal.

Abstract: A demodulator 100 includes: an AD conversion section 10 that converts a received signal RF in an analogue form to a digital signal; a noise removal section 40 that is connected to a back side of the AD conversion section 10 to detect and remove a noise from an input signal; decimation filters 52 and 54 that are connected to a back side of the noise removal section 40 and reduce a data rate of an input signal; and a demodulation section 60 that is connected to back sides of the decimation filters 52 and 54 and demodulates an input signal. The decimation filters 52 and 54 are connected to the back side of the noise removal section 40, which provides a demodulator less subject to degradation of a signal wave.