Music – Instruments
Patent
1975-09-05
1978-01-31
Weldon, Ulysses
Music
Instruments
84 111, 84 119, G10H 100
Patent
active
040709434
ABSTRACT:
An organ is described in which a small number of note generators, each comprising a binary divider, a group of keyers, and an envelope generator, serves an entire keyboard. Each note generator is selectively operable by multiplexed signals from a keyboard to produce either of two adjacent notes in any octave interval. Six of these note generators are provided for each manual of a spinet size organ. A seventh note generator, which is selectively operable to produce any of the notes available from the other six, is provided together with selection circuitry which causes the seventh note generator to augment any one of the other six which is called upon to produce two adjacent, or two octavely related, notes simultaneously. The pitch of all notes is determined by a set of top octave dividers which drive the binary dividers individual to each note generator. Synchronizing circuitry is provided to control the phase relation between binary dividers, when they are driven by a common source, to avoid cancellation effects. The group of keyers in each note generator includes a number which key square waves at octavely related footages. The tone signals from these keyers are combined and filtered to produce various voice qualities selectable by stop switches in a conventional manner. Other keyers of the group act as sine wave synthesizers to produce outputs which are practically devoid of third and fifth harmonics, using digital circuitry controlled by the binary divider outputs. The remaining harmonics are effectively eliminated by integration, allowing these keyer outputs to be used for additive synthesis generation of desired tone timbres. Additional top octave tone sources and binary dividers are provided to obtain true third, fifth and sixth harmonics with these keyers.
REFERENCES:
patent: 3355539 (1967-11-01), Munch et al.
patent: 3534144 (1970-10-01), Ring
patent: 3535969 (1970-10-01), Bunger
patent: 3544699 (1970-12-01), Harris
patent: 3585487 (1971-06-01), McNally
patent: 3617598 (1971-11-01), Woody
patent: 3636231 (1972-01-01), Schrecongost et al.
patent: 3861263 (1975-01-01), Okudaira
Hofstein et al., "The Silicon Insulated-Gate Field-Effect Transistor," Proceedings of the IEEE, pp. 1190-1202.
LandOfFree
Electronic organ keying system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electronic organ keying system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic organ keying system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2071824