Masking sound generating apparatus, storage medium stored with masking sound signal, masking sound reproducing apparatus, and program

摘要

Whereas a high masking effect can be secured in a space to which a masking sound is emitted, the degree of a discomfort a person existing in the space suffers can be reduced. In superimposition processing, a CPU 21 extracts sound signals in different intervals of a sound signal X₁₂-n of a human voice, superimposes the extracted sound signals on each other on the time axis, and outputs a resulting superimposed sound signal X₁₃-n. In shift and addition processing, the CPU 12 interchanges a sound signal, before a reference position, of a sound signal X₁₆-n and a sound signal, after the reference position, of the sound signal X₁₆-n (shift processing) and outputs a sound signal X₁₇-n obtained by adding together a shift-processed sound signal X₁₆′-n and the original, non-shift-processed sound signal X₁₆-n.