METHOD, DEVICE FOR DETECTING CONTRAST OF RECTANGULAR WAVE PATTERN, AND METHOD AND DEVICE FOR CALCULATING AVERAGE OF SIGNAL WAVEFORM

摘要

PROBLEM TO BE SOLVED: To accurately detect the contrast of a rectangular wave pattern where noises coexist. SOLUTION: A crest and valley detecting means 1 detects the crest and valley of a rectangular wave pattern D, and an average calculating means 2 obtains the average of these to divide the rectangular wave pattern into a high density side and a low density side. Respectively on the high density side and low density side, a crest and valley average calculating means obtains the average of the crest and the valley and a standard deviation from the average of these. Then, an abnormal data removing means removes the abnormal data from mountain and valley data, based on standard diviation. A high/low average calculating means 6 obtains a high average and a low average for each of the high/low density sides from crest respectively and valley data removed of abnormal data and a contrast calculating means 7 obtains a difference between these as the contrast of the rectangular wave pattern.