Presence and absence of sound decision device and presence and absence of sound decision manner

摘要

It is provided a voice activity decision apparatus (1) capable of accurately performing the decision ON the state being associated with a sound interval or a silence interval also in terms of the input signal having many aperiodic components and/or plural mixed different periodic components. The apparatus (1) comprises: an autocorrelation calculating unit (11) for calculating autocorrelation values of an input signal; a delay calculating unit (12) for calculating plural delays at which autocorrelation values calculated by the autocorrelation calculating unit (11) become maximums; a noise deciding unit (13) for deciding whether the input signal is a noise or not based ON the plurality of delays calculated by the delay calculating unit (12); and an activity decision unit (14) for performing the activity decision in terms of the input signal based ON results of decision by the noise deciding unit (13) and the input signal. IMAGE