| 摘要 |
PROBLEM TO BE SOLVED: To extract a desired signal while significantly reducing computational complexity.SOLUTION: A filtering device 1A comprises: an A/D conversion part 2 which converts an input signal X into a full band signal A including substantially all signal bands of the input signal X; a high-frequency removal part 3 for separating the full band signal A into a low frequency signal including a DC component and a signal of the other band; an inspection signal generation part 4 for generating an inspection signal which is zero on average in a local time manner and includes an amplitude value of the input signal X; a first addition part 5 which adds the low frequency signal from the high frequency removal part 3 and the inspection signal from the inspection signal generation part 4; a reference point detection part 6 which detects a reference point of an addition signal from the first addition part 5; a timing generation part 7 which generates a timing signal when detecting the reference point; an inspection signal extraction part 8 which extracts a signal value of the inspection signal at the time when the timing signal is inputted; and a signal processing part 9 which outputs a signal F1 of an AC component extracted from a difference between the extracted signal value of the inspection signal and the low frequency signal from the high frequency removal part 3.SELECTED DRAWING: Figure 1 |
