NOISE LEVEL DETECTION DEVICE, RECEIVER, AND NOISE LEVEL DETECTION METHOD

摘要

PROBLEM TO BE SOLVED: To accurately detect a level of noise components in a frequency band of signal components.;SOLUTION: An evaluation unit 142A determines whether it is possible to select a parameter value which is an unknown value in predicted frequency distribution concerning a power spectrum of in-band noise components, so as to have high conformity between power spectrum distribution in a sound signal band of a detection signal DTD in a frame period and the predicted frequency distribution. Thus, the evaluation unit 142A evaluates whether it is possible to determine that sound signal components are not included in the detection signal DTD in the frame period. When a result of the evaluation is positive, a noise level calculation unit 145 calculates a power level of the in-band noise components by aggregating the power spectrum of each frequency in the power spectrum distribution.;COPYRIGHT: (C)2012,JPO&INPIT