Electronic musical instrument having an electronic filter with t

Details Electronic musical instrument having an electronic filter with t Electronic musical instrument having an electronic filter with t

1976-10-21

1978-09-19

Schaefer, Robert K.

Music

Instruments

84 111, 84 112, G10H 100

Patent

active

041144988

ABSTRACT:
An electronic musical instrument capable of changing a slope portion of a filter characteristic continuously from start to completion of production of a musical tone.
The inventive electronic musical instrument changes a filter slope in a frequency region above or below a cut-off frequency with lapse of time and, in order to achieve such change in the filter slope, changes a slope factor continuously from start to completion of production of the tone. The instrument is also capable of changing the cut-off frequency.
An example of a low-pass filter is shown in which a desired form of a successively changing filter slope can be obtained by employing four slope factor values and three values representing a speed of change of the slope factors as well as three cut-off frequency values and two values representing a speed of change of the cut-off frequencies.

REFERENCES:
patent: 3764721 (1973-10-01), Maynard
patent: 3956960 (1976-05-01), Deutsch
patent: 3992971 (1976-11-01), Chibana et al.
patent: 4000675 (1977-01-01), Futumpse et al.

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