Non-linear tone generator

Details Non-linear tone generator Non-linear tone generator

1995-11-09

1998-11-10

Shoop, Jr., William M.

Music

Instruments

Electrical musical tone generation

84608, 84662, 84665, 84DIG10, G10H 100, G10H 102

Patent

active

058346724

ABSTRACT:
A method and apparatus for producing a tone (e.g. for music) without use of a waveform memory and using a feedback loop. The feedback loop includes a waveform generator which calculates, in real time, a parabolic approximation to a sine wave. The feedback loop includes a delay phase differencer to eliminate hunting. The output waveform from the feedback loop is provided to a sine function generator which approximates a sine value using a third order polynomial, to provide the output tone.

REFERENCES:
patent: 4135424 (1979-01-01), Okamoto
patent: 4249447 (1981-02-01), Tomisawa
patent: 4655115 (1987-04-01), Nishimoto
patent: 4813326 (1989-03-01), Hirano et al.
patent: 4840099 (1989-06-01), Kitagawa
patent: 5042001 (1991-08-01), Brightman et al.
patent: 5308918 (1994-05-01), Yamauchi et al.
patent: 5373098 (1994-12-01), Kitayama et al.
patent: 5432296 (1995-07-01), Takeuchi et al.

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