Pillsbury Madison & Sutro LLP
Sound-image position control apparatus
 To obtain a sound-broadened image and a clear sound-image discrimination image when producing plural kinds of sounds, the electronic musical instrument and the like provides a sound-image position control apparatus. This apparatus at least provides a signal mixing portion (e.g., matrix controller) and a virtual-speaker position control portion. The signal mixing portion mixes plural audio signals supplied from a sound source and the like in accordance with a predetermined signal mixing procedure to output plural mixed signals. To control positions of virtual speakers which are emerged as sound-producing points as if each kind of sounds is produced from each of these points, the virtual-speaker position control portion applies different delay times to each of plural mixed signals to output delayed signals as right-side and left-side audio signals to be respectively supplied to right-side and left-side speakers. The sound-image positions formed by the virtual speakers are controlled well, so that the person can clearly discriminate and recognize each of the sound-image positions. 
Yamaha Corporation
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Satoshi Yasutake Junichi
Sekine Suzuki Fujimori