Musical tone synthesis system having shortened excitation table
AssigneeThe Board of Trustees of the Leland Stanford Junior University
InventorJulius O. Smith, III
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Abstract
A tone synthesis system employs a filtered delay loop which is excited by an excitation signal. The excitation signal corresponds to a partial impulse response of a body filter to the system which is to be simulated. Additional components of the impulse response of the body filter are imparted to an output from the filtered delay loop. High quality tone synthesis can be achieved without the necessity of providing a complicated body filter.
Claims46
A tone synthesis system for synthesizing a tone produced by a vibrating element in conjunction with a resonant member to which the vibrating element is acoustically coupled, comprising:
- a closed loop including an input for receiving an excitation signal, a delay for delaying a signal circulating in the loop, and a filter for filtering a signal circulating in the loop and an output from the closed loop for providing a synthesized tone, wherein the amount of delay in the loop corresponds to the pitch of a tone to be synthesized;
- excitation means for providing an excitation signal to the input, said excitation signal including components corresponding to a first partial response of said resonant member to an excitation of said vibrating element;
- and
- resonant filter means for imparting resonance to said output signal in accordance with a second partial response of said resonant member to the excitation of said vibrating element, wherein said first and second partial responses represent a total response of said resonant member to the excitation of said vibrating element.
A tone synthesis system for synthesizing a tone signal produced by a vibrating element which excites a resonant system comprising:
- a closed loop including an input for receiving an excitation signal, a delay for delaying a signal circulating in the loop, a filter for filtering a signal circulating in the loop and an output for providing a synthesized tone signal, wherein an amount of delay in the loop corresponds to the pitch of a tone to be synthesized;
- excitation means for providing an excitation signal to the input, the excitation signal having a form corresponding to a partial response of the resonant system to an excitation of said vibrating element;
- and
- resonant filter means for imparting resonance to said output signal in accordance with a second partial response of said resonant system to said excitation of said vibrating element.
A tone synthesis system comprising:
- a closed loop including an input for receiving an excitation signal, a delay for delaying a signal circulating in the loop, a filter for filtering a signal circulating in the loop and an output for providing a synthesized tone, wherein an amount of delay in the loop corresponds to the pitch of a tone to be synthesized;
- means for providing an excitation signal having a first decaying oscillatory form;
- and
- means for imparting a resonance to said output having a second decaying oscillatory form which decays at a rate less than said first decaying oscillatory form.
A tone synthesis system comprising:
- a closed loop including an input for receiving an excitation signal, a delay for delaying a signal circulating in the loop, a filter for filtering a signal circulating in the loop and an output for providing a signal from the loop as a synthesized tone;
- excitation means for providing an excitation signal, having a form corresponding to a partial response of a resonant system to an excitation, to the input of the closed loop in response to a trigger signal, the excitation means including plural excitation tables each storing a different excitation signal and means for mixing the outputs of the excitation tables to provide a composite excitation signal.
Dependencies are inferred from the claim text.