1982-07-13
1983-12-06
Isen, F. W.
Music
Instruments
84 101, 84 119, G10H 102
Patent
active
044186029
ABSTRACT:
The disclosed organ employs keyboard-activated transfer of individualized tone and envelope-generating information from large memories for each distinctive set of a note's harmonics, to small memories in small circuits corresponding to each harmonic set. Selection of large memories programmed for different temperaments or voice types renders the organ playable as one or another type of organ (e.g., gothic, classical, romantic, theater) in a variety of temperaments (e.g., just-temperament, mean-tone, equal-temperament). Information transferred from any selected large memory causes a circuit common to one or more sets of a note's harmonics to sweep the harmonic data transferred to the small memories for all the note's harmonic sets, to generate respective currents representing attack and decay envelopes for all the note's harmonic sets. Interruption and resumption of currents corresponding respectively to tonal attack and decay are effected immediately, so as to preclude unnatural delays in the activation of these keying phases. The currents representing attack and decay envelopes modulate waveform amplitude currents generated from data transferred to associated small memories. The modulated waveform currents are summed and applied to decouplers which enable a four-element stereophonic system to generate a two-dimensional sound image duplicating that of organ pipes spatially distributed in various configurations and pipe settings.
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Isen F. W.
Nields Henry C.
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