SOUND QUALITY EVALUATION METHOD FOR VEHICLE NOISE USING GAMMATONE FILTER AND APPARATUS THEREOF

摘要

The present invention relates to a sound quality evaluation method for vehicle noise using a gammatone filter, and an apparatus thereof. The sound quality evaluation method for vehicle noise prepared by the present invention comprises the following steps of: obtaining noise signals by vehicle depending on the time; filtering the noise signals with a gammatone filter bank composed of multiple gamma filter channels; obtaining energy distribution depending on the time according to each noise signal by multiple gammatone filter channel; adding up each energy distribution obtained by each gammatone filter channel, on the frequency axis; calculating a spectrum kurtosis value for the noise signals using the added energy distribution; calculating a correlation coefficient between subjective estimations corresponding to audibility evaluation results of an examinee by the noise signal obtained for each vehicle, and the spectrum kurtosis values obtained by the noise signal. The sound quality evaluation method for vehicle noise using a gammatone filter, and an apparatus thereof can apply a gammatone filter to vehicle noise signals such as door closing sound of a vehicle, calculate kurtosis values, and compare the values with subjective estimations for quantifying the noise signals, thereby providing a reliable sound quality index for evaluating the sound quality of vehicle noise.;COPYRIGHT KIPO 2014;[Reference numerals] (AA) Start;(BB) End;(S210) Obtaining noise signals by vehicle depending on the time;(S220) Filtering the noise signals with a gammatone filter bank composed of multiple gamma filter channels;(S230) Obtaining energy distribution depending on the time according to each noise signal filtered by multiple gammatone filter channel;(S240) Adding up each energy distribution obtained by each gammatone filter channel on the frequency axis;(S250) Calculating a spectrum kurtosis value for the noise signals using the added energy distribution;(S260) Calculating a correlation coefficient between subjective estimations corresponding to audibility evaluation results of an examinee by the noise signal obtained for each vehicle and the spectrum kurtosis values obtained by the noise signal;(S270) Generating a sound quality index formula about vehicle noise having spectrum kurtosis values as input values and the corresponding subjective estimations as output values;(S280) Performing sound quality evaluation for an arbitrary noise signal by using the sound quality index formula