US3735013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for producing an aperiodic vibrato signal
Assignee: US Philips Corp
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Filing: 1971-09-20
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Granted: 1973-05-22
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Expires: 1991-09-20
Abstract
Abstract A system for producing a vibrato signal which varies in frequency in a manner uncorrelated with time in an electronic musical instrument, in which at least two dissonant signals are applied to a control input of each tone generator via a gate circuit, a divider chain and a low-pass filter.
Inventors
- 👤 Der Peet C Van
- 👤 C Mulkens
- 👤 W Ruiterkamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:46
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/043
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
A system for producing a vibrato signal which varies in frequency in a manner uncorrelated with time in an electronic musical instrument, comprising: a gate circuit; a plurality of pulse shapers connected to said gate circuit at inputs thereof; a divider stage connected to said gate circuit at an output thereof; a plurality of tone generators each having a control input; a low pass filter connected between the divider stage and each control input of said tone generators; and divider chains connected between said tone generators and said pulse shapers.
Claim 2
Independent Claim
90 words
A system for producing a vibrato signal which varies in frequency in a manner uncorrelated with time in an electronic musical instrument, comprising: a gate circuit; a plurality of pulse shapers connected to said gate circuit at inputs thereof; a divider stage connected to said gate circuit at an output thereof; a plurality of tone generators each having a control input; a low pass filter connected between the divider stage and each control input of said tone generators; and divider chains connected between said tone generators and said pulse shapers.
Claim 3
Dependent Claim
18 words
The system of claim 1, wherein said low pass filter is connected to a set of three generators.
Claim 4
Dependent Claim
38 words
The system of claim 1, wherein the low pass filter has a cut-off frequency lying between approximately one and four times a reciprocal of a mean period of a signal appearing at an output of the divider stage.
Claim 5
Dependent Claim
21 words
The system of claim 1, wherein at least two dissonant signals are applied to said control input of each tone generator.
References Cited (Backward Citations)
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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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |