Music – Instruments
Patent
1977-12-01
1980-01-29
Rubinson, Gene Z.
Music
Instruments
84DIG9, 84DIG10, 84 119, 84 124, 84 126, 364724, 364721, G10H 106, G10H 510
Patent
active
041855299
ABSTRACT:
A digital organ or like electronic musical instrument of a real time processing system which produces musical notes by synthesizing weighted square waves and applying them to a digital filter of a transfer characteristic controlled for each square wave. Key information from a keyboard is detected by a key code generator having a key switch matrix in which key switches are grouped into a plurality of blocks. The key switches are scanned for each block and when one or more key switches of the block are closed, the scanning is stopped until after the closure information is sent out as binary coded information to a key code data assignor in accordance with priority. The key code data assignor applies envelope control signals to an envelope generator and an N-degree square wave generator. The envelope generator is a cyclic digital filter whose filter constant is controlled to provide desired envelope waveshape data for input to a multiplier. The square wave generator accumulates angular velocity information to generate a square wave signal SQU(N) of a period T/10 from a square wave signal of a fundamental period T. In a square wave memory, a square wave level designated by a tablet draw bar switch is calculated to read out a level coefficient value A.sub.N which is inverted and gated by the square wave signal SQU(N) to provide an N-degree square wave A.sub.N SQU(N) for input to a cyclic digital filter whose filter constant is controlled in accordance with the input signal A.sub.N SQU(N) to provide a waveshape f.sub.N [A.sub.N SQU(N)] for input to the multiplier. The output from the multiplier is accumulated by an accumulator for each degree and channel and a waveshape h(t) for each sample is applied via a D-A converter to a sound system.
REFERENCES:
patent: 3899951 (1975-08-01), Griffith
patent: 3981217 (1976-09-01), Oya
patent: 4022098 (1977-05-01), Deutsch
patent: 4079650 (1978-03-01), Deutsch
patent: 4114495 (1978-09-01), Tomisawa
Feeney William L.
Kabushiki Kaisha Kawai Gakki Seisakusho
Rubinson Gene Z.
LandOfFree
Electronic musical instrument 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 musical instrument, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic musical instrument will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-875803