US3848142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Envelope signal forming circuit
Assignee: Nippon Gakki Co Ltd
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Filing: 1973-03-20
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Granted: 1974-11-12
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Expires: 1993-03-20
Abstract
Abstract A conventional envelope signal forming circuit for producing percussive envelope signals in an electronic musical instrument is improved by the provision of a circuitry for setting a control voltage which is utilized to control a charge-discharge capacitor therein so as to reduce the overlapping of a plurality of envelope signals in one aspect of this invention and to allow the envelope signal to have a controllable sustained portion in another aspect thereof.
Inventors
- 👤 T Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:13
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/053; G10H1/057; G06; G06G; G06G7/00; G06G7/12; G06G7/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
In an improved envelope signal forming circuit having a first charge-discharge capacitor, a diode, a second charge-discharge capacitor connected through said diode to said first chargedischarge capacitor, a first charge resistor connected in parallel to a series circuit consisting of said diode and said second charge-discharge capacitor, and a second discharge resistor connected in parallel to said second charge-discharge capacitor for producing as an envelope signal the voltage of said second charge-discharge capacitor, the improvement which comprises: a field-effect transistor to control the envelope signal having a decaying waveform, said field-effect transistor having its drain and source electrodes directly connected across said first charge-discharge capacitor; and a control voltage setting device comprising a variable resistor and a power source connected in parallel thereto, the wiper arm of said variable resistor being connected to the gate electrode of said field-effect transistor, the resistence of said fieldeffect transistor being controlled by the voltage set by said variable resistor to control the envelope signal.
Claim 2
Dependent Claim
161 words
In an improved envelope signal forming circuit having a first charge-discharge capacitor, a diode, a second charge-discharge capacitor connected through said diode to said first chargedischarge capacitor, a first charge resistor connected in parallel to a series circuit consisting of said diode and said second charge-discharge capacitor, and a second discharge resistor connected in parallel to said second charge-discharge capacitor for producing as an envelope signal the voltage of said second charge-discharge capacitor, the improvement which comprises: a field-effect transistor to control the envelope signal having a decaying waveform, said field-effect transistor having its drain and source electrodes directly connected across said first charge-discharge capacitor; and a control voltage setting device comprising a variable resistor and a power source connected in parallel thereto, the wiper arm of said variable resistor being connected to the gate electrode of said field-effect transistor, the resistence of said fieldeffect transistor being controlled by the voltage set by said variable resistor to control the envelope signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |