Formant filter generator for an electronic musical instrument

摘要

In the production of a desired musical waveform by combining harmonic components corresponding to respective harmonic orders, the cut-off harmonic order qc, each harmonic component value is controlled by selecting the level Ha and the slope of the Formant filter characteristic. The cut-off harmonic order qc, the level Ha and the slope value can each be varied over a predetermined range. These operations can be performed with a simple circuit arrangement involving a small number of memories. Therefore, the present invention greatly contributes to the reduction of the size and the cost of electronic musical instruments.