Patent ID: 8428272
Filing Date: 2013-04-23
Classification: G10K,H04K

Abstract:
1. A masking sound generating apparatus comprising: one or more processors configured to function as a band dividing part divides an audio signal into a plurality of frequency bands, and generates a plurality of band signals belonging respectively to the plurality of the frequency bands; an envelope signal generating part that generates a plurality of envelope signals representing respective envelopes of the plurality of the band signals generated by the band dividing part; a signal converting part that applies to each of the plurality of the envelope signals generated by the envelope signal generating part a signal conversion process so as to randomize sections of the envelope signal which are greater than a first threshold and less than a second threshold which is greater than the first threshold, and outputs the plurality of the envelope signals each applied with the signal conversion process; a multiplying part that multiplies each envelope signal outputted from the signal converting part by a signal belonging to a frequency band same as that of each envelope signal, and outputs the plurality of the envelope signals multiplied by the signals as individual band masking signals corresponding to the respective frequency bands; and an adding part that adds the individual band masking signals output by the multiplying part and outputs a masking sound signal as a result of the addition.