Patent US4086838A successfully refreshed from Google Patents.
US4086838A
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US
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Vibrato signal generating arrangement for an electronic musical instrument
Assignee: Nippon Gakki Co Ltd
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Filing: 1977-10-19
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Granted: 1978-05-02
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Expires: 1997-10-19
Abstract
Abstract A delayed vibrato signal generating arrangement comprises an envelope signal generator having a capacitor, a switching device for discharging the capacitor at the instant of key depression, and two charging circuits providing different charging time constants for charging the capacitor to produce an envelope signal; a semiconductor unidirectional device coupled to the envelope signal generator; and a vibrato signal generator coupled to the unidirectional device. The capacitor is relatively rapidly charged to a predetermined potential level by both the two charging circuits and then gradually charged by only one of the charging circuits. The signal portion of the envelope signal substantially below the predetermined potential level is clipped off by the unidirectional device to provide a time delay for delayed vibrator. The time delay is virtually determined by the time constant for charging the capacitor to the predetermined potential level.
Inventors
- 👤 Katsuzi Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:52
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/053; G10H1/057; G10H2210/00; G10H2210/155; G10H2210/195; G10H2210/201
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
161 words
A vibrato signal generating arrangement for an electronic musical instrument comprising: potential sources of first, second and third potentials, said third potential having an intermediate value between said first and second potentials; a capacitor having a first terminal connected to said source of the second potential; a switching device connected in parallel with said capacitor; a series combination of a first resistor and a first unidirectional device connected between said source of the third potential and a second terminal of said capacitor; a second resistor connected between said source of the first potential and said second terminal of said capacitor; a second unidirectional device having an input connected to the junction between said second resistor and said capacitor; means coupled to said switching device for producing a key depression representative signal at the instant of key depression to render said switching device conductive to discharge said capacitor; and a vibrato oscillator means connected to an output of said second unidirectional device.
Claim 2
Dependent Claim
161 words
A vibrato signal generating arrangement for an electronic musical instrument comprising: potential sources of first, second and third potentials, said third potential having an intermediate value between said first and second potentials; a capacitor having a first terminal connected to said source of the second potential; a switching device connected in parallel with said capacitor; a series combination of a first resistor and a first unidirectional device connected between said source of the third potential and a second terminal of said capacitor; a second resistor connected between said source of the first potential and said second terminal of said capacitor; a second unidirectional device having an input connected to the junction between said second resistor and said capacitor; means coupled to said switching device for producing a key depression representative signal at the instant of key depression to render said switching device conductive to discharge said capacitor; and a vibrato oscillator means connected to an output of said second unidirectional device.
Claim 3
Dependent Claim
14 words
The arrangement according to claim 1 wherein said first resistor is of variable type.
Claim 4
Dependent Claim
14 words
The arrangement according to claim 1 wherein said second resistor is of variable type.
Claim 5
Dependent Claim
18 words
The arrangement according to claim 1 wherein said second resistor has a greater value than said first resistor.
Claim 6
Dependent Claim
14 words
The arrangement according to claim 1 wherein said second unidirectional device is a diode.
Claim 7
Dependent Claim
24 words
The arrangement according to claim 1 wherein the third potential has a value which substantially equals the threshold voltage of said first unidirectional device.
Claim 8
Dependent Claim
14 words
The arrangement according to claim 1 wherein said first unidirectional device is a diode.
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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |