Korg Incorporated

Mikio Nagashima

Yasuhiko Mori

Haruhiko Motohashi

A high pass filterhaving a cut-off frequency of 200 Hz and a cut-off response of +12 dB/OCT and a low pass filterhaving a cut-off frequency of 400 Hz and a cut-off response steeper than &#x2212;24 dB/OCT are used to pick out components in a double overtone region of 200&#x2dc;400 Hz of a bass musical instrument such as a base or a bass drum from an input audio signal. The component which is picked out is input to distortion applying meanshaving an input-output response which is a non-linear response having no point symmetry with respect to 0 point, thus applying a distortion to cause even-numbered overtone components to be produced. An output from the distortion applying meansand the input audio signal are summed in a summerto be delivered. Natural tones which have boosted bass tones and which are free from impurity are obtained.

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Hachiouji, Japan

Mikio Nagashima