Method for deriving and replicating complex musical tones
AssigneeAllen Organ Company
InventorsDwight A. Beacham, Robert P. Woron, John T. Whitefield
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Abstract
A method for achieving the effect of air movement in instruments during replication and sounding of complex musical instruments by separating unstable frequency components, the quasi-periodic components, from stable fundamental and harmonic components, the periodic components, of compound voice waveforms, storing the respective component information pertaining to the quasi-periodic and periodic components in separate memory locations, and recombining the quasi-periodic component with one or more periodic components in appropriate fashion to form and sound the compound voice waveforms.
Claims26
In an electronic musical instrument having a keyboard for allowing the production of sounds corresponding to selected voices at pitches corresponding to respective notes of a musical scale as indicated by depressed keys, a method of deriving and replicating compound voice waveforms spanning transient and steady-state portions of the selectable voices of said instrument comprising the steps of:
- deriving periodic and quasi-periodic components from said compound voice waveforms by separating unstable quasi-periodic component waveforms of the selected voices containing combinations of non-harmonics along with some harmonics of the selected voices from stable periodic component waveforms of the selected voices containing the fundamental and a number of the significant harmonics of the selected voices;
- storing the quasi-periodic component waveforms of the selected voices;
- storing the stable periodic component waveforms of the selected voices;
- generating addresses for selectively causing the reading of the quasi-periodic component waveform of at least one selected voice from storage in accordance with the selective actuation of keys and switches for choosing notes and voices;
- generating addresses for selectively causing the reading of the periodic component waveform of one or more selected voices from storage in accordance with the selective actuation of keys and switches for choosing notes and voices;
- combining and converting the waveform output of the quasi-periodic component with one or more waveform outputs of the periodic component to replicate the compound voice waveform of the one or more selected voices through an audio amplification system.
In an electronic musical instrument allowing the production of sounds corresponding to depressed keys representing respective notes of a musical scale, a method of reproducing sounds representative of selected predetermined voices and selected keys and switches of said instrument comprising the steps of:
- deriving periodic and quasi-periodic component waveforms representative of the predetermined voices;
- storing at least one quasi-periodic component waveforms;
- storing the periodic component waveforms'
- generating addresses for selectively causing the reading of at least one quasi-periodic component waveform from storage in accordance with the selected predetermined voices and depressed keys;
- generating addresses for selectively causing the reading of the periodic component waveforms from storage in accordance with the selected predetermined voices and depressed keys;
- converting the waveform output of the quasi-periodic component and the waveform output of the periodic component into sounds corresponding to the selected predetermined voices.
Dependencies are inferred from the claim text.