US4294153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of synthesizing musical tones
Assignee: Nippon Gakki Co Ltd
•
Filing: 1979-09-20
•
Granted: 1981-10-13
•
Expires: 1999-09-20
Abstract
Abstract A method of synthesizing a musical sound in which a fundamental waveform signal is produced which has a zero crossing point within one cycle period thereof and the phase of the zero crossing point is modulated by a modulation signal to provide a musical tone with a complex waveshape.
Inventors
- 👤 Yasuhiro Mitsuhashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:29
CPC Classifications
G; G10; G10H; G10H7/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
163 words
A method of synthesizing a musical tone comprising the steps of: periodically producing a fundamental signal which can be represented as a waveform crossing an axis representing zero amplitude, the fundamental signal having first, second and third zero crossing points (i.e., the points at which said waveform crosses said zero amplitude axis) at a phase within one cycle period of the fundamental signal, said first and third zero crossing points being a starting point and a terminating point of the waveform in one cycle period respectively, said second zero crossing point being an intermediate transitional point of the waveform in one cycle period from one side to the other of the zero amplitude axis; periodically producing a modulation signal; and modulating the phase of said second zero crossing point of said fundamental signal with said modulation signal without modulating the phases of said first and third points to thereby determine the frequency spectrum of the resulting signal to produce a synthesized musical tone.
Claim 2
Independent Claim
163 words
A method of synthesizing a musical tone comprising the steps of: periodically producing a fundamental signal which can be represented as a waveform crossing an axis representing zero amplitude, the fundamental signal having first, second and third zero crossing points (i.e., the points at which said waveform crosses said zero amplitude axis) at a phase within one cycle period of the fundamental signal, said first and third zero crossing points being a starting point and a terminating point of the waveform in one cycle period respectively, said second zero crossing point being an intermediate transitional point of the waveform in one cycle period from one side to the other of the zero amplitude axis; periodically producing a modulation signal; and modulating the phase of said second zero crossing point of said fundamental signal with said modulation signal without modulating the phases of said first and third points to thereby determine the frequency spectrum of the resulting signal to produce a synthesized musical tone.
Claim 3
Dependent Claim
13 words
The method according to claim 1 wherein said fundamental signal comprises quadratic functions.
Claim 4
Dependent Claim
30 words
The method according to claim 2 wherein said quadratic functions are (x+1) (x-a) and -(x-1) (x-a), where a and x represent said second zero crossing point and a variable, respectively.
Claim 5
Dependent Claim
32 words
The method according to claim 2 wherein said quadratic functions are (x+1) (x-a) (1-a) and -(x-1) (x-a) (1+a), where a and x represent said second zero crossing point and a variable, respectively.
Claim 6
Dependent Claim
13 words
The method according to claim 1 wherein said modulation signal comprises quadratic functions.
Claim 7
Dependent Claim
19 words
The method according to claim 5 wherein said quadratic functions are u(u+1) and -u(u-1), where u represents a variable.
Claim 8
Dependent Claim
27 words
The method according to claim 1 wherein said modulation signal is a product of quadratic functions and a modulation index function which is a function of time.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |