METHOD FOR INHARMONIC TONE GENERATION USING A COUPLED MODE DIGITAL FILTER

摘要

A coupled mode digital filter which simulates any number of arbitrarily tuned modes coupled together so as to share the same loss element at a junction loaded by an arbitrary impedance function is formed from the combination of one first order allpass filter (28) and one unit delay (30) per mode and one shared coupling filter (36). This coupled mode digital filter may be excited by a stored or generated excitation signal, or a filtered excitation signal, to produce inharmonic percussive sounds and musically interesting two-stage and beating decay envelopes resulting from natural coupling of modes of near frequencies.