Music – Instruments
Patent
1975-09-22
1977-05-31
Jackmon, E. S.
Music
Instruments
84 101, 84 126, G10H 102, G10F 100
Patent
active
040261794
ABSTRACT:
The electronic musical instrument according to the invention produces excellent tone color effect by changing filter characteristics discontinuously from the start of generation of a musical tone.
A plurality of filter characteristics each represented by a deflecting line consisting of straight lines (these filter characteristics being different from each other in coordinates at each point of deflection as well as inclination of each straight line) are stored in memory. These filter characteristics are sequentially read out with the lapse of time and level information of each harmonic constituting a musical tone is obtained by calculating a primary functional formula of the straight line region in which the read out filter characteristic belongs. The level of each harmonic is controlled in response to this level information.
In calculating the primary functional formula, one can select either "transferred formant" control in which a filter characteristic is substantially transferred by conducting calculation in accordance with a frequency corresponding to the degree of each harmonic or "fixed formant" control in which calculation is conducted in accordance with a frequency in which the fundamental frequency of the musical tone is included.
REFERENCES:
patent: 3823390 (1974-07-01), Tomisawa et al.
Jackmon E. S.
Nippon Gakki Seizo Kabushiki Kaisha
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