Patent US4520708A successfully refreshed from Google Patents.
US4520708A
Expired / Lapsed
US
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Tone waveshape generation device
Assignee: Nippon Gakki Co Ltd
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Filing: 1984-04-09
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Granted: 1985-06-04
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Expires: 2004-04-09
Abstract
Abstract In a waveshape memory, a first waveshape of plural periods including an attack portion and a second waveshape of plural periods are stored. A tone waveshape signal is produced by reading out the first waveshape once and thereafter reading out the second waveshape repeatedly. The first waveshape is a first section including an attack portion cut off from a desired original tone waveshape. The second waveshape is principally composed of a second specified section succeeding the first specified section cut off from the original tone waveshape. A terminal portion in the second specified section is weighted with decay characteristics and is added with a corresponding terminal portion of the first specified section which has been weighted with attack characteristics, thereby effecting smooth connection between the respective waveshapes.
Inventors
- 👤 Masatada Wachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:34
CPC Classifications
G; G10; G10H; G10H7/00; G10H7/02; G10H7/06; G10H1/00; G10H1/02; G10H1/04; G10H1/053
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
168 words
A tone waveshape generation device comprising: memory means for storing, a first waveshape of plural periods which is a first specified section of an original waveshape of plural periods, said original waveshape being a complete waveshape of a tone to be produced from beginning to end of the tone production and said first specified section being a section from beginning to a certain point of said original waveshape to include an attack portion thereof, and a second waveshape of plural periods which is comprised of the concatenation of a second specified section succeeding said first specified section of said original waveshape excluding a terminal portion of said second specified section, and a terminal portion, said terminal portion being determined by adding a weighted one of a terminal portion of said first specified section and a weighted one of said terminal portion of said second specified section; and readout means for reading out said first waveshape once and thereafter reading out said second waveshape repeatedly from said memory means.
Claim 2
Dependent Claim
168 words
A tone waveshape generation device comprising: memory means for storing, a first waveshape of plural periods which is a first specified section of an original waveshape of plural periods, said original waveshape being a complete waveshape of a tone to be produced from beginning to end of the tone production and said first specified section being a section from beginning to a certain point of said original waveshape to include an attack portion thereof, and a second waveshape of plural periods which is comprised of the concatenation of a second specified section succeeding said first specified section of said original waveshape excluding a terminal portion of said second specified section, and a terminal portion, said terminal portion being determined by adding a weighted one of a terminal portion of said first specified section and a weighted one of said terminal portion of said second specified section; and readout means for reading out said first waveshape once and thereafter reading out said second waveshape repeatedly from said memory means.
Claim 3
Dependent Claim
50 words
A tone waveshape generation device as defined in claim 1 wherein the weightings of said terminal portions are effected by weighting said terminal portion of said second specified section with a function of decay characteristics and said terminal portion of said first specified section with a function of attack characteristics.
Claim 4
Dependent Claim
60 words
A tone waveshape generation device as defined in claim 1 wherein said original tone waveshape is a waveshape provided witfh a periodical amplitude modulation and said second specified section is a section of about one period of the amplitude change with the beginning and end thereof being in the vicinity of a small amplitude portion in the periodical amplitude change.
Claim 5
Dependent Claim
60 words
A tone waveshape generation device as defined in claim 1 wherein said original tone waveshape is a waveshape provided with a periodical frequency modulation and said second specified section is a section of about one period of the frequency change with the beginning and end thereof being in the vicinity of a low frequency portion in the periodical frequency change.
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) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |