Patent ID: 9553751
Date: 2017-01-24
CPC Classifications: G01C,H03M,H04B,H04L

Claim:
1. A demodulation device for demodulating a base signal from a composite signal, which is composed of a carrier wave and a modulation signal of the base signal, the demodulation device comprising: a pre-correction base signal determination part, which determines a difference between the composite signal of a former-half period and the composite signal of a latter-half period to be a pre-correction base signal of the base signal, the former-half period being a one-half period of a sampling period starting at one of a local maximum and a local minimum of the carrier wave and the latter-half period following the former-half period; a reference level determination part, which determines a reference level from the composite signal; and a base signal determination part, which determines a post-correction base signal based on a ratio between the pre-correction base signal determined by the pre-correction base signal determination part and the reference level determined by the reference level determination part.