Patent ID: 9693171
Date: 2017-06-27
CPC Classifications: H04R,H04S

Claim:
1. A sound field measuring device comprising: an external output unit configured to output a measurement signal composed of a periodic function having a code length of 2 a microphone configured to pick up the measurement signal outputted from the speaker; a Fourier transform unit configured to obtain frequency characteristics by Fourier transforming measurement sound picked up by the microphone with a sample length of 2 a thinning-out unit configured to remove noise from the frequency characteristics obtained by the Fourier transform unit by removing line spectra except for the (k×2 an averaging unit configured to obtain averaged frequency characteristics of a sound field by calculating an average value of signal levels in a predetermined frequency range on the basis of frequency characteristics thinned out by the thinning-out unit while shifting the frequency range in steps of a shorter frequency range than the frequency range, wherein n and m are each a natural number satisfying m>n, and k is k=0, 1, 2, and the like.