US4662261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic musical instrument with autoplay function
Assignee: Casio Computer Co Ltd
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Filing: 1985-08-27
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Granted: 1987-05-05
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Expires: 2005-08-27
Abstract
Abstract When key-off information is given after the start of an operation of generating a predetermined tone according to key-on information, a predetermined period of time is counted from the instant the key-off information is provided and, after the lapse of the predetermined period of time, a process of stopping the tone is executed, whereby a minimum necessary interval of a tone can, according to a key signal, be ensured.
Inventors
- 👤 Takashi Akutsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:33
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/18; G10H1/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
An electronic musical instrument comprising: key signal generating means for generating a key signal containing key-on information and key-off information of a tone to be sounded; tone signal generating means for generating a predetermined tone signal according to said key-on information; tone generating means for generating a tone according to said tone signal; time counting means responsive to said key-off information for starting time counting when key-off information is generated by said key signal generating means while said tone is being generated; and stopping process starting means for supplying a signal to said tone signal generating means to start a stopping process of the generated tone at the instant a predetermined elapsed period of time is counted by said time counting means after generation of said key-off information by said key signal generating means.
Claim 2
Dependent Claim
134 words
An electronic musical instrument comprising: key signal generating means for generating a key signal containing key-on information and key-off information of a tone to be sounded; tone signal generating means for generating a predetermined tone signal according to said key-on information; tone generating means for generating a tone according to said tone signal; time counting means responsive to said key-off information for starting time counting when key-off information is generated by said key signal generating means while said tone is being generated; and stopping process starting means for supplying a signal to said tone signal generating means to start a stopping process of the generated tone at the instant a predetermined elapsed period of time is counted by said time counting means after generation of said key-off information by said key signal generating means.
Claim 3
Dependent Claim
48 words
The electronic musical instrument according to claim 1, which further comprises: detecting means for detecting the generation of key-on information of the next tone during said predetermined period of time; and stopping means for stopping the generated tone as soon as the next said key-on information is detected.
Claim 4
Dependent Claim
49 words
The electronic musical instrument according to claim 1, which further comprises a key-off exist flag register to be turned on when key-off information is generated, said time counting means including a key-off delay counter for starting a time counting operation when said key-off exist flag register is turned on.
Claim 5
Dependent Claim
27 words
The electronic musical instrument according to claim 1, wherein said tone signal generating means and time counting means each have a multi-stage structure for a polyphonic system.
Claim 6
Dependent Claim
31 words
The electronic musical instrument according to claim 1, wherein said key signal generating means includes an interface means coupled to an external data processing unit for receiving key-on and key-off information.
References Cited (Backward Citations)
US4014238A
Cited
US4570520A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |