Patent ID: 8718124
Filing Date: 2014-05-06
Classification: G06N,H04B

Abstract:
1. A noise detecting method for detecting a noise occurred in a communication medium, the method comprising the steps of: (a) measuring a signal level in the communication medium at a predetermined interval; (b) extracting, as an observed noise sequence, a measurement result for a predetermined measurement periodical unit; (c) calculating, from the extracted observed noise sequence, a noise characteristic by using a hidden Markovian-Gaussian noise model; (d) calculating, from the calculated noise characteristic and the observed noise sequence, an estimated state sequence that is a sequence indicative of whether or not a state is a noise-occurred state; (e) individually detecting, from the estimated state sequence, an impulsive noise at each time point within the predetermined measurement periodical unit; and (f) determining, based on the calculated noise characteristic, the presence or absence of occurrence of the impulsive noise for the predetermined measurement periodical unit, wherein the estimated state sequence is calculated as a sequence including a state, in which the impulsive noise is occurred, or a state, in which the impulsive noise is not occurred, for each section equivalent to one or a plurality of the predetermined intervals, and in the step (f), the determination is made based on at least one of a temporal concentration of the impulsive noise, an impulsive noise occurrence probability, an impulsive-to-background noise ratio, and a background noise power in the predetermined measurement periodical unit.