Music – Instruments
Patent
1976-06-17
1978-08-08
Schaefer, Robert K.
Music
Instruments
G10H 102
Patent
active
041049462
ABSTRACT:
In a voicing system for electronic organs, square wave signals from a tone generator are converted to a waveform of another shape, the harmonic structure of which is useful for producing certain organ voices. This modified waveform is further modified, as by integration or differentiation, to produce signals of yet another wave shape whose harmonic content makes it useful for deriving still other organ voices. In one embodiment, the square wave pulses are initially converted to narrow pulses which are particularly suitable for the production of reed and certain string voices, and these sharp, narrow pulses are integrated to produce, in effect, a separate source of signals having a sawtooth waveform the harmonic structure of which is particularly suitable for production of cello, diapason and flute sounds. In another embodiment, the square wave pulses are first combined to produce a synthesized sawtooth waveform which may be applied to appropriate filters to produce cello, diapason or flute sounds, and the synthesized sawtooth waveform pulses are differentiated to produce a source of sharp, narrow pulses which may be applied to other suitable filter networks to produce other organ voices such as reed or string sounds. In the process of conversion from one pulse shape to the other, whether by integration or differentiation, all harmonics of the starting pulse, regardless of the frequency of the note, are shifted in phase by substantially 90.degree., thereby enabling the selective combination of the voice signals from the voicing filters in a way such as to minimize deleterious cancellation of certain harmonics when two or more stops of the organ are played simultaneously.
REFERENCES:
patent: 3569604 (1971-03-01), Schwartz
patent: 3748598 (1973-07-01), Munch, Jr. et al.
patent: 3855893 (1974-12-01), Chase
patent: 3919648 (1975-11-01), Uetrecht
patent: 3930429 (1976-01-01), Hill
patent: 3938378 (1968-08-01), Olson
Miska Vit W.
Olson Spencer E.
Schaefer Robert K.
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