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Patent US4471681A successfully refreshed from Google Patents.
US4471681A
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Electronic musical instrument capable of producing a musical tone by varying tone color with time
Assignee: Nippon Gakki Co Ltd
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Filing: 1982-09-23
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Granted: 1984-09-18
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Expires: 2002-09-23
Abstract
Abstract Each one of a plurality of harmonic components is multiplied with a first amplitude coefficient to form a plurality of harmonic components corresponding to a musical tone signal having a desired waveform. Each of the harmonic components is varied with time by a first envelope waveform signal in accordance with a second amplitude coefficient corresponding to each harmonic to form a harmonic component of a spectrum varying with time in a desired manner. By using a second envelope waveform signal, amplitudes of respective harmonic components are varied in a predetermined manner and then the harmonic components are synthesized to form a musical tone.
Inventors
- 👤 Tetsuo Nishimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:42
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/06; G10H1/08; G10H1/04; G10H1/053; G10H1/057; G10H1/0575; G10H7/00; G10H7/02; G10H7/06; G10H2250/00; G10H2250/131; G10H2250/161
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
171 words
An electronic musical instrument comprising: harmonics generating means for generating a plurality of original harmonic component signals for a predetermined number of harmonics; amplitude coefficient generating means for generating a first set of amplitude coefficients and a second set of amplitude coefficients for each harmonic; time function generating means for generating a first time function signal and a second time function signal, each of which varies with time in a predetermined manner; first computing means for producing time varied amplitude coefficients for each harmonic by arithmetically combining each amplitude coefficient of said second set of amplitude coefficients with said first time function signal; second computing means for producing respective time varied modified harmonic component signals for each harmonic by arithmetically combining each of said plurality of original harmonic component signals with the corresponding one of said first set of amplitude coefficients, the corresponding one of said time varied amplitude coefficients and said second time function signal; and synthesizing means for synthesizing said modified harmonic component signals, thereby producing a musical tone.
Claim 2
Dependent Claim
171 words
An electronic musical instrument comprising: harmonics generating means for generating a plurality of original harmonic component signals for a predetermined number of harmonics; amplitude coefficient generating means for generating a first set of amplitude coefficients and a second set of amplitude coefficients for each harmonic; time function generating means for generating a first time function signal and a second time function signal, each of which varies with time in a predetermined manner; first computing means for producing time varied amplitude coefficients for each harmonic by arithmetically combining each amplitude coefficient of said second set of amplitude coefficients with said first time function signal; second computing means for producing respective time varied modified harmonic component signals for each harmonic by arithmetically combining each of said plurality of original harmonic component signals with the corresponding one of said first set of amplitude coefficients, the corresponding one of said time varied amplitude coefficients and said second time function signal; and synthesizing means for synthesizing said modified harmonic component signals, thereby producing a musical tone.
Claim 3
Dependent Claim
19 words
An electronic musical instrument according to claim 1 wherein said first computing means is of a logarithmic processing type.
Claim 4
Dependent Claim
38 words
An electronic musical instrument according to claim 1 wherein said first set of amplitude coefficients is one selected from a plurality of sets of amplitude coefficients, one of which has a combination pattern different from that of another.
Claim 5
Dependent Claim
38 words
An electronic musical instrument according to claim 1 wherein said second set of amplitude coefficients is one selected from a plurality of sets of amplitude coefficients one of which has a combination pattern different from that of another.
Claim 6
Dependent Claim
37 words
An electronic musical instrument according to claim 1 wherein said first time function signal is one selected from a plurality of time function signals, one of which has a time variation pattern different from that of another.
Claim 7
Dependent Claim
37 words
An electronic musical instrument according to claim 1 wherein said second time function signal is one selected from a plurality of time function signals, one of which has a time variation pattern different from that of another.
Claim 8
Dependent Claim
26 words
An electronic musical instrument according to claims 3, 4, 5 or 6, wherein said selecting operation is made through switching operation of a manual selection switch.
References Cited (Backward Citations)
US4270430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |