Adaptive accompaniment level in an electronic musical instrument

摘要

A keyboard operated electronic musical instrument having a number of keyboards in which the loudness balance of the accompaniment keyboards are adaptively maintained at a preselected loudness ratio with respect to the solo keyboard. The loudness balance is automatically maintained as the tone switches are altered and as the number of actuated notes varies on the keyboards. The balance ratio is accomplished by adaptively scaling the harmonic coefficients used in a discrete Fourier transform to generate the tones for the accompaniment keyboards.