Method and apparatus for timbre control in an electronic musical

Details Method and apparatus for timbre control in an electronic musical Method and apparatus for timbre control in an electronic musical

1978-11-27

1981-01-20

Truhe, J. V.

Music

Instruments

84 113, 84 119, G10H 106

Patent

active

042455421

ABSTRACT:
An electronic musical instrument is provided with a keyboard which may comprise one or more keyboard sections. Plural instrument voices are stored in memory for each section of the instrument keyboard. Each stored voice comprises a set of plural multiple bit digital words. A composite audible tone corresponding to an active key comprises varying combinations of component signals derived from the stored voices. The decay pattern of the composite audible tone is divided into successive time zones. The durations of the zones may vary. For each zone, the amplitude of at least one of the component signals of the composite tone is caused to decay while the amplitudes of the remaining component signals are either not modulated or are maintained at zero. The rate of decay of the amplitude of a component signal, hence the duration of a particular time zone, may be made a function of the keyboard section associated with the active key. In an alternative embodiment, the instrument voices are not stored in memory. Instead, plural octavely related frequency signals generated by the multiplexed accumulator of the instrument are combined to generate the signals which are to be modulated to obtain the decay pattern of the composite audible tone.

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