DEVICE AND METHOD FOR SIGNAL DETECTION, AND DEVICE AND METHOD FOR NOISE TRACKING

摘要

PROBLEM TO BE SOLVED: To realize signal detection which is robust to various kinds of background noises. SOLUTION: A feature quantity of an inputted signal series is extracted (32, 34) and a feature quantity of a noise component included in the signal series is extracted (36). Then a 1st likelihood showing the probability that the signal series is detected is calculated based upon a preset signal-to-noise ratio and the extracted feature quantity of the signal series and a 2nd likelihood showing the probability that the noise component is detected is calculated; and further the likelihood ratio of the 1st likelihood and 2nd likelihood is calculated (38). Then detection of the signal series is judged from the likelihood ratio (40, 44). COPYRIGHT: (C)2005,JPO&NCIPI