US3626077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organ tone modulation system
Assignee: Baldwin Piano and Organ Co
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Filing: 1970-05-26
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Granted: 1971-12-07
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Expires: 1990-05-26
Abstract
Abstract Organ output, comprising a band of audio frequencies, is divided into four frequency subbands, each of which is shifted in frequency by one of four respective diverse increments. The first and third subbands are acoustically transduced and radiated via a rotary loudspeaker and the second and fourth subbands via a stationary loudspeaker. These radiations are acoustically mixed with the radiated unmodified organ output to produce desired tonal effects. Frequency shifting of the subbands can be inhibited at will, means being provided automatically to maintain the acoustic signal level the same whether or not frequency shifting is in force, for a given setting of the expression pedal. Each of the four subbands can be shifted by either of two respective frequency increments, or inhibited, to permit selective variation of the overall acoustic effect. Frequency shifting for each subband is achieved by dividing the organ tone into three components of equal magnitude and 120* phase difference. To obtain the 120* spaced components, the input tone signal is applied to two-phase shift filters which provide two of the components, the third component being derived by summing the first two components and inverting the resulting signal. Each component is applied to a respective section of four threesection modulators, each section comprising a transistor pair connected to form a DC differential amplifier with one input at AC ground. The emitter currents of each transistor pair are varied at the shift frequency by a three-phase oscillator, each modulator section being controlled by a respective oscillator phase. The outputs of each section of the modulator are combined to cancel the oscillator components provided at each section.
Inventors
- 👤 Walter Munch Jr
- 👤 William S Wagner
- 👤 Dale M Huetrecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:23
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/0091
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
308 words
A system for generating chorus effects in music, comprising: control means for selectively placing said system in each of at least first, second and third operating modes; a source of an audio spectrum; first means responsive to said system in said first operating mode for shifting by a first frequency deviation f1 all the frequencies of said audio spectrum to form a processed audio band and responsive to said system in said second operating mode for shifting by a second frequency deviation f2 all the frequencies of said audio spectrum to form said processed audio band; second means responsive to said system in said third operating mode for passing all the frequencies of said audio spectrum unshifted to form said processed audio band; means for maintaining the acoustic level of said processed audio band substantially equal for all said operating modes; and means for acoustically radiating said processed audio band, including: means for separating said audio spectrum into three components of equal amplitude and mutually spaced in phase by 120*; and means for applying said three components to said firSt means; wherein said first means includes: a three-phase subsonic oscillator for providing three oscillatory signals of equal frequency mutually phase separated by 120*; amplitude-modulation means for amplitude-modulating each of said three components with a respective one of said three oscillatory signals to provide three amplitude-modulated signals; and means for algebraically summing the three amplitude-modulated signals to provide said processed audio band, wherein said means for separating comprises: first phase-shift means for receiving said audio spectrum and providing one of said three components; second phase-shift means for receiving said audio spectrum and providing a second of said three components; means for algebraically summing said one and said second components; and means for inverting the sum of said one and second components to provide the third of said three components.
Claim 2
Independent Claim
308 words
A system for generating chorus effects in music, comprising: control means for selectively placing said system in each of at least first, second and third operating modes; a source of an audio spectrum; first means responsive to said system in said first operating mode for shifting by a first frequency deviation f1 all the frequencies of said audio spectrum to form a processed audio band and responsive to said system in said second operating mode for shifting by a second frequency deviation f2 all the frequencies of said audio spectrum to form said processed audio band; second means responsive to said system in said third operating mode for passing all the frequencies of said audio spectrum unshifted to form said processed audio band; means for maintaining the acoustic level of said processed audio band substantially equal for all said operating modes; and means for acoustically radiating said processed audio band, including: means for separating said audio spectrum into three components of equal amplitude and mutually spaced in phase by 120*; and means for applying said three components to said firSt means; wherein said first means includes: a three-phase subsonic oscillator for providing three oscillatory signals of equal frequency mutually phase separated by 120*; amplitude-modulation means for amplitude-modulating each of said three components with a respective one of said three oscillatory signals to provide three amplitude-modulated signals; and means for algebraically summing the three amplitude-modulated signals to provide said processed audio band, wherein said means for separating comprises: first phase-shift means for receiving said audio spectrum and providing one of said three components; second phase-shift means for receiving said audio spectrum and providing a second of said three components; means for algebraically summing said one and said second components; and means for inverting the sum of said one and second components to provide the third of said three components.
Claim 3
Dependent Claim
50 words
The system according to claim 1 wherein said first and second phase-shift means each comprises a second-order RC filter and a phase inverter connected in parallel therewith, wherein the term second-order filter means that the filter has a gain which is a second order function of the Laplace S operator.
Claim 4
Dependent Claim
58 words
The system according to claim 1 wherein said first and second phase-shift means each includes respective first and second second-order filter sections and a common phase inverter connected in parallel with both said filter sections, wherein the term second-order filter means that the filter has a gain which is a first order function of the Laplace S operator.
Claim 5
Independent Claim
304 words
A system for generating chorus effects in music, comprising: control means for selectively placing said system in each of at least first, second and third operating modes; a source of an audio spectrum; first means responsive to said system in said first operating mode for shifting by a first frequency deviation f1 all the frequencies of said audio spectrum to form a processed audio band and responsive to said system in said second operating mode for shifting by a second frequency deviation f2 all the frequencies of said audio spectrum to form said processed audio band; second means responsive to said system in said third operating mode for passing all the frequencies of said audio spectrum unshifted to form said processed audio band; means for maintaining the acoustic level of said processed audio band substantially equal for all said operating modes; and means for acoustically radiating said processed audio band, including: means for separating said audio spectrum into three components of equal amplitude and mutually spaced in phase by 120*; and means for applying said three components to said first means; wherein said first means includes: a three-phase subsonic oscillator for providing three oscillatory signals of equal frequency mutually phase separated by 120*; amplitude-modulation means for amplitude-modulating each of said three components with a respective one of said three oscillatory signals to provide three amplitude-modulated signals; and means for algebraically summing the three amplitude-modulated signals to provide said processed audio band, wherein said amplitude-modulation means comprises: three DC differential amplifiers, one for each of said three components, each amplifier including one input terminal for receiving a respective one of said components and a second input terminal connected to AC ground; and means for varying the output current of each of said amplifiers at the frequency of a respective one of said three oscillatory signals.
Claim 6
Independent Claim
304 words
A system for generating chorus effects in music, comprising: control means for selectively placing said system in each of at least first, second and third operating modes; a source of an audio spectrum; first means responsive to said system in said first operating mode for shifting by a first frequency deviation f1 all the frequencies of said audio spectrum to form a processed audio band and responsive to said system in said second operating mode for shifting by a second frequency deviation f2 all the frequencies of said audio spectrum to form said processed audio band; second means responsive to said system in said third operating mode for passing all the frequencies of said audio spectrum unshifted to form said processed audio band; means for maintaining the acoustic level of said processed audio band substantially equal for all said operating modes; and means for acoustically radiating said processed audio band, including: means for separating said audio spectrum into three components of equal amplitude and mutually spaced in phase by 120*; and means for applying said three components to said first means; wherein said first means includes: a three-phase subsonic oscillator for providing three oscillatory signals of equal frequency mutually phase separated by 120*; amplitude-modulation means for amplitude-modulating each of said three components with a respective one of said three oscillatory signals to provide three amplitude-modulated signals; and means for algebraically summing the three amplitude-modulated signals to provide said processed audio band, wherein said amplitude-modulation means comprises: three DC differential amplifiers, one for each of said three components, each amplifier including one input terminal for receiving a respective one of said components and a second input terminal connected to AC ground; and means for varying the output current of each of said amplifiers at the frequency of a respective one of said three oscillatory signals.
Claim 7
Independent Claim
778 words
A system for generating chorus effects in music, comprising: a source of an audio spectrum; control means for selectively placing said system in each of at least first, second and third independent operating modes; first means responsive to said system in said first operating mode for shifting by a first frequency deviation f1 all the frequencies of said audio spectrum to form a firsT processed audio band, responsive to said system in said second operating mode for shifting by a second frequency deviation f1'' all the frequencies of said audio spectrum to form said first processed audio band, and responsive to said system in said third operating mode for passing all the frequencies of said audio spectrum unshifted to form said first processed audio band; second means responsive to said system in said first operating mode for shifting by a first frequency deviation f2 all the frequencies of said audio spectrum to form a second processed audio band, responsive to said system in said second operating mode for shifting by a second frequency deviation f2'' all the frequencies of said audio spectrum to form said second processed audio band, and responsive to said system in said third operating mode for passing all the frequencies of said audio spectrum unshifted to form said second processed audio band; third means responsive to said system in said first operating mode for shifting by a first frequency deviation f3 all the frequencies of said audio spectrum to form a third processed audio band, responsive to said system in said second operating mode for shifting by a second frequency deviation f3'' all the frequencies of said audio spectrum to form said third processed audio band, and responsive to said system in said third operating mode for passing all the frequencies of said audio spectrum unshifted to form said third processed audio band; fourth means responsive to said system in said first operating mode for shifting by a first frequency deviation f4 all the frequencies of said audio spectrum to form a fourth processed audio band, responsive to said system in said second operating mode for shifting by a second frequency deviation f4'' all the frequencies of said audio spectrum to form said fourth processed audio band, and responsive to said system in said third operating mode for passing all the frequencies of said audio spectrum unshifted to form said fourth processed audio band; means for filtering said first, second, third and fourth processed audio bands to provide respective first, second, third and fourth audio subbands, each audio subband consisting of a different range of frequencies in said audio spectrum such that all frequencies of said audio spectrum are included in at least one audio subband; means for separately acoustically transducing and radiating each of said audio subbands, including: means for separating said audio spectrum into three components of equal amplitude and mutually spaced in phase by 120*; and means for applying said three components to each of said first, second, third and fourth means; wherein each of said first, second, third and fourth means includes: a three-phase subsonic oscillator for providing three oscillatory signals of equal frequency but mutually spaced 120* in phase; means for amplitude-modulating each of said three components with a respective one of said three oscillatory signals to provide three amplitude-modulated signals; means for algebraically summing the three amplitude modulated signals to provide said first, second, third and fourth processed audio bands, respectively, wherein said first, second, third and fourth means each includes: means responsive to said system in said first operating mode for providing said three oscillatory signals at frequency f1 at said first means, f2 at said second means, f3 at said third means, and f4 at said fourth means; and means responsive to said system in said second operating mode for providing said three oscillatory signals at frequency f1'' at said first means, f2'' at said second means, f3'' at said third means, and f4'' at said fourth means, wherein said first, second, third and fourth means include means responsive to said system in said system in saiD third operating mode for passing only one of said three components, without modulation, as said first, second, third, and fourth processed audio bands, respectively, said only one component being of the same phase in each of said first, second, third and fourth means, and further comprising: means for amplifying said audio spectrum prior to separation into said three components by said means for separating; and means responsive to said system in said third operating mode for adjusting the gain of said amplifier means to compensate for gain variation resulting from the utilization of only one of said three components.
Claim 8
Independent Claim
778 words
A system for generating chorus effects in music, comprising: a source of an audio spectrum; control means for selectively placing said system in each of at least first, second and third independent operating modes; first means responsive to said system in said first operating mode for shifting by a first frequency deviation f1 all the frequencies of said audio spectrum to form a firsT processed audio band, responsive to said system in said second operating mode for shifting by a second frequency deviation f1'' all the frequencies of said audio spectrum to form said first processed audio band, and responsive to said system in said third operating mode for passing all the frequencies of said audio spectrum unshifted to form said first processed audio band; second means responsive to said system in said first operating mode for shifting by a first frequency deviation f2 all the frequencies of said audio spectrum to form a second processed audio band, responsive to said system in said second operating mode for shifting by a second frequency deviation f2'' all the frequencies of said audio spectrum to form said second processed audio band, and responsive to said system in said third operating mode for passing all the frequencies of said audio spectrum unshifted to form said second processed audio band; third means responsive to said system in said first operating mode for shifting by a first frequency deviation f3 all the frequencies of said audio spectrum to form a third processed audio band, responsive to said system in said second operating mode for shifting by a second frequency deviation f3'' all the frequencies of said audio spectrum to form said third processed audio band, and responsive to said system in said third operating mode for passing all the frequencies of said audio spectrum unshifted to form said third processed audio band; fourth means responsive to said system in said first operating mode for shifting by a first frequency deviation f4 all the frequencies of said audio spectrum to form a fourth processed audio band, responsive to said system in said second operating mode for shifting by a second frequency deviation f4'' all the frequencies of said audio spectrum to form said fourth processed audio band, and responsive to said system in said third operating mode for passing all the frequencies of said audio spectrum unshifted to form said fourth processed audio band; means for filtering said first, second, third and fourth processed audio bands to provide respective first, second, third and fourth audio subbands, each audio subband consisting of a different range of frequencies in said audio spectrum such that all frequencies of said audio spectrum are included in at least one audio subband; means for separately acoustically transducing and radiating each of said audio subbands, including: means for separating said audio spectrum into three components of equal amplitude and mutually spaced in phase by 120*; and means for applying said three components to each of said first, second, third and fourth means; wherein each of said first, second, third and fourth means includes: a three-phase subsonic oscillator for providing three oscillatory signals of equal frequency but mutually spaced 120* in phase; means for amplitude-modulating each of said three components with a respective one of said three oscillatory signals to provide three amplitude-modulated signals; means for algebraically summing the three amplitude modulated signals to provide said first, second, third and fourth processed audio bands, respectively, wherein said first, second, third and fourth means each includes: means responsive to said system in said first operating mode for providing said three oscillatory signals at frequency f1 at said first means, f2 at said second means, f3 at said third means, and f4 at said fourth means; and means responsive to said system in said second operating mode for providing said three oscillatory signals at frequency f1'' at said first means, f2'' at said second means, f3'' at said third means, and f4'' at said fourth means, wherein said first, second, third and fourth means include means responsive to said system in said system in saiD third operating mode for passing only one of said three components, without modulation, as said first, second, third, and fourth processed audio bands, respectively, said only one component being of the same phase in each of said first, second, third and fourth means, and further comprising: means for amplifying said audio spectrum prior to separation into said three components by said means for separating; and means responsive to said system in said third operating mode for adjusting the gain of said amplifier means to compensate for gain variation resulting from the utilization of only one of said three components.
Claim 9
Dependent Claim
119 words
A circuit for separating an audio spectrum into three components of equal amplitude and frequency content but mutually spaced by 120* in phase, said circuit including: first second-order filter means for receiving said audio spectrum and providing one of said three components; second second-order filter means for receiving said audio spectrum and providing a second of said three components; means for providing an intermediate signal having an amplitude corresponding to the sum of the amplitudes of said one and said second components; and means for inverting said intermediate signal to provide the third of said components, wherein the order of a filter is the order in terms of the Leplace S operator which defines the gain of the filter.
Claim 10
Dependent Claim
119 words
A circuit for separating an audio spectrum into three components of equal amplitude and frequency content but mutually spaced by 120* in phase, said circuit including: first second-order filter means for receiving said audio spectrum and providing one of said three components; second second-order filter means for receiving said audio spectrum and providing a second of said three components; means for providing an intermediate signal having an amplitude corresponding to the sum of the amplitudes of said one and said second components; and means for inverting said intermediate signal to provide the third of said components, wherein the order of a filter is the order in terms of the Leplace S operator which defines the gain of the filter.
Claim 11
Dependent Claim
185 words
The combination according to claim 6, including a common phase inverter connected in series with said first second-order filter and in parallel with said second second-order filter, wherein each of said first and second second-order filters includes: a first resistor, a first capacitor and a second resistor, all connected in series; and a second capacitor connected to ground from a junction between said first capacitor and said second resistor, wherein each of said first and second second-order filters additionally includes a third resistor, said third resistor for said first second-order filter being connected in parallel with the series-connected combination of said phase inverter and said first resistor, first capacitor and second resistor of said first second-order filter, said third resistor of said second second-order filter being connected in series across the series connected first resistor, first capacitor and second resistor of said second second-order filter, wherein the component values of said resistors and capacitors are selected to provide a difference between the phase versus frequency characteristics of said first and second second-order filters of substantially 120* over at least four octaves of said audio spectrum.
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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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |