Patent ID: 8861741
Filing Date: 2014-10-14
Classification: G10K

Abstract:
1. An acoustic device that outputs audio from a speaker to a predetermined space, comprising: an addition part configured to add together a first audio signal from a sound source and a noise cancellation signal for calculating a second audio signal to be supplied to said speaker; a detection part configured to detect a signal level of said first audio signal and a signal level of said second audio signal; a sound pickup part configured to pick up sound that has arrived at a predetermined position within said predetermined space; and a generation part configured to generate said noise cancellation signal by referring to a relationship between results of detection by said detection part and to a result of sound pickup by said sound pickup part, wherein the relationship between results is one of a difference between said first audio signal and said second audio signal and a ratio of the signal level of said first audio signal to the signal level of said second audio signal, wherein when the signal level of said second audio signal is smaller than the signal level of said first audio signal and the relationship between results is the difference between said first audio signal and said second audio signal, the greater the difference, the smaller an amount of noise cancellation performed by said generation part, and wherein when the signal level of said second audio signal is smaller than the signal level of said first audio signal and the relationship between results is the ratio of the signal level of said first audio signal to the signal level of said second audio signal, the smaller the ratio, the smaller an amount of noise cancellation performed by said generation part.