US3847050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic organ with plural master oscillators and plural vibrato oscillators for each note
Assignee: AUDIO SYNTHESISERS Ltd
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Filing: 1971-07-26
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Granted: 1974-11-12
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Expires: 1991-07-26
Abstract
Abstract An electronic organ having means for improving the musical quality of the notes produced by producing a number of parallel electrical signals having vibrato modulations which are mutually uncorrelated in frequency and/or phase. These signals are intermodulated to provide an output signal in which the components drift in and out of phase to produce a vibrato effect which resembles a conventional reeded or stringed instrument. The vibrator modulations can be provided either by low frequency oscillators operating on master oscillators (or tone generators) or by modulating a carrier frequency with a tone signal and using one sideband of the modulated signal thus produced to modulate a second carrier frequency signal. The difference in the frequencies of the two carrier frequency oscillators controls a frequency shift of the original tone signal and this difference can be controlled by a vibrato oscillator of suitable frequency.
Inventors
- 👤 K Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:17
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/043
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
95 words
In an electronic organ having a number of keys for producing different musical notes, a network producing each note comprising at least two master oscillators, at least two vibrato oscillators, said vibrato oscillators each being connected for modulating the frequency of a respective master oscillator, the said vibrato oscillators operating at mutually uncorrelated frequency and/or phase, and means operative upon actuation of each of said keys for combining the outputs of the said two master oscillators thereby forming an output electrical signal from said network to produce a musical note which displays a random variation.
Claim 2
Dependent Claim
95 words
In an electronic organ having a number of keys for producing different musical notes, a network producing each note comprising at least two master oscillators, at least two vibrato oscillators, said vibrato oscillators each being connected for modulating the frequency of a respective master oscillator, the said vibrato oscillators operating at mutually uncorrelated frequency and/or phase, and means operative upon actuation of each of said keys for combining the outputs of the said two master oscillators thereby forming an output electrical signal from said network to produce a musical note which displays a random variation.
Claim 3
Dependent Claim
24 words
The electronic organ of claim 1 wherein both said master oscillators produce output electrical signals substantially representing the musical note produced by said network.
Claim 4
Dependent Claim
52 words
The electronic organ of claim 1 wherein said network includes at least one further master oscillator producing an output signal at a substantially constant frequency at the nominal frequency of said two master oscillators, said output signal from said further oscillator being combined with the outputs of said other two master oscillators.
Claim 5
Dependent Claim
13 words
The electronic organ of claim 1 wherein said vibrato oscillators are free-running oscillators.
Claim 6
Dependent Claim
152 words
In an electronic organ having a number of keys for producing different musical notes, a network producing each note comprising at least two first carrier frequency oscillators producing carrier frequency signals, means modulating said carrier frequency signals to produce a modulated signal, said modulating means including oscillator means producing an electrical signal representing the note produced by said network, at least two second carrier frequency oscillators, producing second carrier frequency signals, means modulating said second carrier frequency signals with at least one sideband of said modulated signal, means controlling the frequency difference between respective pairs comprising one said first carrier frequency oscillator and one said second carrier frequency oscillator, said controlling means operating at mutually uncorrelated phase and/or frequency, and means combining the modulated outputs of said two second carrier frequency oscillators and forming the output electrical signal from said network to produce a musical note which displays a small random variation.
Claim 7
Dependent Claim
152 words
In an electronic organ having a number of keys for producing different musical notes, a network producing each note comprising at least two first carrier frequency oscillators producing carrier frequency signals, means modulating said carrier frequency signals to produce a modulated signal, said modulating means including oscillator means producing an electrical signal representing the note produced by said network, at least two second carrier frequency oscillators, producing second carrier frequency signals, means modulating said second carrier frequency signals with at least one sideband of said modulated signal, means controlling the frequency difference between respective pairs comprising one said first carrier frequency oscillator and one said second carrier frequency oscillator, said controlling means operating at mutually uncorrelated phase and/or frequency, and means combining the modulated outputs of said two second carrier frequency oscillators and forming the output electrical signal from said network to produce a musical note which displays a small random variation.
Claim 8
Dependent Claim
36 words
The electronic organ of claim 5 wherein said means controlling the difference between the frequencies of said first and second carrier frequency oscillators operates to introduce a sinusoidal variation in the difference between the frequencies thereof.
Claim 9
Dependent Claim
21 words
The electronic organ of claim 5 wherein there are provided means suppressing at least said carrier frequency of said modulated signal.
Claim 10
Dependent Claim
24 words
The electronic organ of claim 7 wherein there are provided means suppressing both said carrier frequency and one side band of said modulated signal.
Claim 11
Dependent Claim
128 words
In an electronic organ having a number of keys for producing different musical notes, a network comprising at least one oscillator producing an electrical tone signal representing the musical note to be produced, first carrier frequency oscillator means, producing a first carrier signal, means modulating said first carrier signal with said electrical tone signal to produce a modulated signal, means suppressing the carrier frequency of said modulated signal, second carrier frequency oscillator means producing a second carrier frequency signal, means modulating said second carrier frequency signal with at least one sideband of said modulated signal, and means varying the difference between the frequencies of said first and second carrier frequency oscillators at a controlled rate whereby the frequencies of the components of said electrical tone signal are varied.
Claim 12
Dependent Claim
128 words
In an electronic organ having a number of keys for producing different musical notes, a network comprising at least one oscillator producing an electrical tone signal representing the musical note to be produced, first carrier frequency oscillator means, producing a first carrier signal, means modulating said first carrier signal with said electrical tone signal to produce a modulated signal, means suppressing the carrier frequency of said modulated signal, second carrier frequency oscillator means producing a second carrier frequency signal, means modulating said second carrier frequency signal with at least one sideband of said modulated signal, and means varying the difference between the frequencies of said first and second carrier frequency oscillators at a controlled rate whereby the frequencies of the components of said electrical tone signal are varied.
Claim 13
Dependent Claim
45 words
The electronic organ of claim 9 wherein said means varying said difference between the frequencies of said first and second carrier frequency oscillators is operative to vary said difference periodically at a given low frequeNcy to produce a vibrato effect on the musical note produced.
Claim 14
Dependent Claim
30 words
The electronic organ of claim 10 wherein said means varying said difference between said frequencies of said first and second carrier frequency oscillators is operative to vary said difference sinusoidally.
Claim 15
Dependent Claim
27 words
The electronic organ of claim 9 wherein said means suppressing said carrier frequency of said modulated signal also operates to suppress one sideband of said modulated signal.
Claim 16
Dependent Claim
44 words
The electronic organ of claim 9 wherein said difference between said frequencies of said first and second carrier frequency oscillators is varied by varying the frequency of said first carrier frequency oscillator while maintaining the frequency of said second carrier frequency oscillator substantially constant.
Claim 17
Dependent Claim
44 words
The electronic organ of claim 9 wherein said difference between said frequencies of said first and second carrier frequency oscillators is varied by varying said frequency of said second carrier frequency oscillator while maintaining the frequency of said first carrier frequency oscillator substantially constant.
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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 |