Modulation effect device

Details Modulation effect device Modulation effect device

1988-02-19

1991-07-30

Isen, Forester W.

Electrical audio signal processing systems and devices

Sound effects

Tremelo or vibrato effects

84629, H03G 300

Patent

active

050365410

ABSTRACT:
A modulation effect device is implemented by utilizing a fact that a phase or frequency of an output signal from a digital filter can be varied by varying a filter-coefficient according to a lapse of time. A musical tone signal inputted into the digital filter is phase-or frequency-modulated in accordance with the variation of the filter coefficient, thereby imparting such modulation effect as vibrato, chorus or ensemble (symphonic chorus) to the musical tone signal.

REFERENCES:
patent: 4211138 (1980-07-01), Deutsch
patent: 4219880 (1980-08-01), Nichols
patent: 4237343 (1980-12-01), Kurtin et al.
patent: 4267761 (1981-05-01), Deutsch
patent: 4338581 (1982-07-01), Morgan
patent: 4389915 (1983-06-01), Bione
Chamberlin, Musical Applications of Microprocessors, 1980, pp. 447-451, 464-465.
Budak, Passive and Active Network Analysis and Synthesis, 1974, p. 443.
Beigel, "A Digital `Phase-Shifter` for Musical Applications, Using the Bell Labs (Alles-Fischer) Digital Filter Module" Journal of the Audio Engineers Society, vol. 27, No. 9, Sep. 1979.

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