US3781475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counterbalanced two speaker rotary tremolo device
Assignee: CBS Broadcasting Inc
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Filing: 1971-05-26
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Granted: 1973-12-25
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Expires: 1991-05-26
Abstract
Abstract A rotary tremolo device employs a pair of outwardly facing speakers mounted in counterbalanced relationship on a rotatable support. The speakers are respectively driven by signals derived from the same source but differing in phase, preferably by 90 electrical degrees, so as to provide an asymmetrical sound radiation pattern. As the support is rotated at about five to eight revolutions per second, a tremolo and vibrato effect is produced. The support may also be rotated at slower or faster speeds to produce other effects.
Inventors
- 👤 P Sharp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:19
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/043; G10H1/047
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
93 words
An apparatus for producing pulsato by acoustic means, comprising: a. a support; b. means for rotating said support about an axis; c. first and second speakers mounted on said support on diametrically opposite sides of said axis to be mutually counterbalanced; d. means for supplying to the respective speakers, drive signals derived from the same source signal, but differing in phase by a value other than either zero, 180* or a multiple of 180said drive signals producing from said speakers a sound radiation pattern which repeats only once per revolution of said support.
Claim 2
Independent Claim
93 words
An apparatus for producing pulsato by acoustic means, comprising: a. a support; b. means for rotating said support about an axis; c. first and second speakers mounted on said support on diametrically opposite sides of said axis to be mutually counterbalanced; d. means for supplying to the respective speakers, drive signals derived from the same source signal, but differing in phase by a value other than either zero, 180* or a multiple of 180said drive signals producing from said speakers a sound radiation pattern which repeats only once per revolution of said support.
Claim 3
Dependent Claim
18 words
The apparatus according to claim 1 in which said support is a drum, said speakers facing radially outwardly.
Claim 4
Dependent Claim
27 words
The apparatus according to claim 1 in which said rotating means imparts rotation to said support at a rate of about five to eight revolutions per second.
Claim 5
Dependent Claim
28 words
The apparatus according to claim 1 in which said drive signals differ in phase by about 45* to 135* or by such amount plus a multiple of 180*.
Claim 6
Dependent Claim
27 words
Apparatus according to claim 1 wherein said means for driving comprises a phase difference network receiving said source signal and providing said phase differing speaker drive signals.
Claim 7
Dependent Claim
13 words
Apparatus according to claim 5 further comprising means for amplifying said source signal.
Claim 8
Dependent Claim
17 words
ApparatuS according to claim 5 further comprising means for separately amplifying each of said speaker drive signals.
Claim 9
Dependent Claim
48 words
Apparatus according to claim 5 wherein said phase difference network comprises first and second lattice filters each receiving said source signal, said source signal being substantially within the pass band of said filters, said pair of speaker drive signals being provided respectively by said first and second filters.
Claim 10
Dependent Claim
22 words
Apparatus according to claim 1 wherein said speaker drive signals differ in phase by 90* or 90* plus a multiple of 180*.
Claim 11
Dependent Claim
31 words
Apparatus according to claim 9 wherein said support includes a generally cylindrical housing carried by a coaxial shaft, said speakers being mounted adjacent the periphery of said housing in counterbalanced relationship.
Claim 12
Dependent Claim
94 words
A rotary tremolo device comprising a. a support; b. means for rotating said support about an axis at between about five and eight revolutions per second; c. a pair of oppositely facing sound channels mounted in counterbalanced relationship on said support; and d. means for driving said sound channels with a pair of signals differing in phase by an angle of between about 45* and 135or by an integral number of cycles plus said angle, to produce from said channels an asymmetrical sound radiation pattern which repeats only once per revolution of said support.
Claim 13
Dependent Claim
94 words
A rotary tremolo device comprising a. a support; b. means for rotating said support about an axis at between about five and eight revolutions per second; c. a pair of oppositely facing sound channels mounted in counterbalanced relationship on said support; and d. means for driving said sound channels with a pair of signals differing in phase by an angle of between about 45* and 135or by an integral number of cycles plus said angle, to produce from said channels an asymmetrical sound radiation pattern which repeats only once per revolution of said support.
Claim 14
Dependent Claim
13 words
A rotary tremolo device according to claim 9 wherein said angle is 90*.
Claim 15
Dependent Claim
110 words
Apparatus for producing tremolo acoustically, comprising: a. first and second speakers mounted in spaced, facing relationship along a vertical axis; b. planar reflecting means disposed between said speakers and mounted for rotation about said vertical axis at a rate of between about five and eight revolutions per second, said planar reflecting means being situated at other than a right angle with respect to said vertical axis; and c. electrical signal source means for driving said speakers with a pair of signals differing in phase by between approximately 45* and 135* to produce from said apparatus a sound radiation pattern which repeats only once per revolution of said planar reflecting means.
Claim 16
Dependent Claim
110 words
Apparatus for producing tremolo acoustically, comprising: a. first and second speakers mounted in spaced, facing relationship along a vertical axis; b. planar reflecting means disposed between said speakers and mounted for rotation about said vertical axis at a rate of between about five and eight revolutions per second, said planar reflecting means being situated at other than a right angle with respect to said vertical axis; and c. electrical signal source means for driving said speakers with a pair of signals differing in phase by between approximately 45* and 135* to produce from said apparatus a sound radiation pattern which repeats only once per revolution of said planar reflecting means.
Claim 17
Dependent Claim
75 words
A rotary tremolo device comprising: a. two speakers; b. means for driving said speakers with a pair of signals derived from the same source signal but differing in phase to produce an asymmetrical sound radiation pattern having a single major lobe; and c. rotary means for effectively causing said asymmetrical sound radiation pattern to rotate about an axis at a slow speed, said sound radiation pattern repeating only once per revolution of said rotary means.
Claim 18
Dependent Claim
75 words
A rotary tremolo device comprising: a. two speakers; b. means for driving said speakers with a pair of signals derived from the same source signal but differing in phase to produce an asymmetrical sound radiation pattern having a single major lobe; and c. rotary means for effectively causing said asymmetrical sound radiation pattern to rotate about an axis at a slow speed, said sound radiation pattern repeating only once per revolution of said rotary means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |