Yamaha Corporation

Masato Hata

Yasushi Shimizu

Akira Miki

Takashi Yamakawa

Atsuko Ito

Mai Koike

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 CPUextracts sound signals in different intervals of a sound signal X-n of a human voice, superimposes the extracted sound signals on each other on the time axis, and outputs a resulting superimposed sound signal X-n. In shift and addition processing, the CPU 12 interchanges a sound signal, before a reference position, of a sound signal X-n and a sound signal, after the reference position, of the sound signal X-n (shift processing) and outputs a sound signal X-n obtained by adding together a shift-processed sound signal X'-n and the original, non-shift-processed sound signal X-n.

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

In a masker sound generation apparatus, an acquisition part acquires a sound signal, and a generation part generates a masker sound signal based on the acquired sound signal. Specifically, the generation part divides the sound signal acquired by the acquisition part into a plurality of sections each having a predetermined time length, then repeats a sorting process of sorting the divided sections as a process of changing the sequence of arrangement of the sound signal, and alters a manner of sorting the sections each time the sorting process is repeated.

Masker sound generation apparatus and program

In a masking sound generation apparatus, a CPU analyzes a speech utterance speed of a received sound signal. Then, the CPU copies the received sound signal into a plurality of sound signals and performs the following processing on each of the sound signals. Namely, the CPU divides each of the sound signals into frames on the basis of a frame length determined on the basis of the speech utterance speed. Reverse process is performed on each of the frames to replace a waveform of the frame with a reverse waveform, and a windowing process is performed to achieve a smooth connection between the frames. Then, the CPU randomly rearranges the order of the frames and mixes the plurality of sound signals to generate a masking sound signal.

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Hamamatsu, Japan

Masato Hata