US3842205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tremolo effect producing acoustic filter system
Assignee: Nippon Gakki Co Ltd
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Filing: 1973-07-16
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Granted: 1974-10-15
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Expires: 1993-07-16
Abstract
Abstract The apparatus of the invention comprises a loudspeaker, preferably, having a nearly flat diaphragm, and a plurality of microphones disposed in confronting relationship to the diaphragm of the loudspeaker at different positions in a sound radiation plane of the diaphragm, so that the microphones can individually pick up sounds radiating from different portions of the diaphragm where vibrational modes are expected to be different from one another. Further to finish a tremolo effect to the sounds finally produced, the sound waves from the loudspeaker to the microphones are periodically interrupted. According to one example of the invention, such periodical sound interruption may be caused by rotating the loudspeaker itself, and according to another example thereof, there may be employed a sound interrupting member having therein sound passages for selectively and locally passing the sound waves emitted from the different portions of the loudspeaker to the respective microphones, such sound interrupting member being disposed rotatably between the loudspeaker and the microphones.
Inventors
- 👤 E Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:28
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/043; G10H1/045; G10H1/047
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
171 words
A tremolo effect producing acoustic filter system comprising: a closed housing, said housing including therein an electroacoustic transducer having a sound radiating surface and capable of radiating sounds having a desired frequency band, a plurality of acousto-electric transducers for picking up the sounds radiated from said electro-acoustic transducer and converting the sounds into electric signals, said plurality of transducers being juxtaposed and acoustically isolated from each other and opposed to the sound radiating surface of said electro-acoustic transducer at different positions thereof, and a rotary sound interrupting member disposed relatively closely between said sound radiating surface of the electro-acoustic transducer aNd said plurality of the acousto-electric transducers, said rotary sound interrupting member periodically interrupting, in accordance with the revolution thereof, sound paths leading from said electro-acoustic transducer to said plurality of acoustoelectric transducers, so as to provide fade-in and fade-out effects and different frequency band characteristics for the sounds picked up by the respective acousto-electric transducers; and means for giving rotation to said rotary sound interrupting member at a required speed.
Claim 2
Dependent Claim
171 words
A tremolo effect producing acoustic filter system comprising: a closed housing, said housing including therein an electroacoustic transducer having a sound radiating surface and capable of radiating sounds having a desired frequency band, a plurality of acousto-electric transducers for picking up the sounds radiated from said electro-acoustic transducer and converting the sounds into electric signals, said plurality of transducers being juxtaposed and acoustically isolated from each other and opposed to the sound radiating surface of said electro-acoustic transducer at different positions thereof, and a rotary sound interrupting member disposed relatively closely between said sound radiating surface of the electro-acoustic transducer aNd said plurality of the acousto-electric transducers, said rotary sound interrupting member periodically interrupting, in accordance with the revolution thereof, sound paths leading from said electro-acoustic transducer to said plurality of acoustoelectric transducers, so as to provide fade-in and fade-out effects and different frequency band characteristics for the sounds picked up by the respective acousto-electric transducers; and means for giving rotation to said rotary sound interrupting member at a required speed.
Claim 3
Dependent Claim
21 words
The system according to claim 1, in which said electro-acoustic transducer and said acousto-electric transducers are a loudspeaker and microphones, respectively.
Claim 4
Dependent Claim
43 words
The system according to claim 1, in which said rotary sound interrupting member is of a cylindrical form having sound passages provided therein to open at different side surfaces thereof, said passages corresponding in number and position to said plurality of acousto-electric transducers.
Claim 5
Dependent Claim
27 words
The system according to claim 1, in which said rotary sound interrupting member is a disc having cutout or opening patterns therein to selectively form sound passages.
Claim 6
Dependent Claim
32 words
The system according to claim 2, in which said closed housing mounts therein a compartment member having juxtaposed compartments inside thereof each for accommodating each of said plurality of microphones therein separately.
Claim 7
Dependent Claim
17 words
The system according to claim 2, in which said loudspeaker is of a nearly flat type diaphragm.
Claim 8
Dependent Claim
92 words
A tremolo effect producing acoustic filter system comprising: a hermetically sealed box, said box including therein a loudspeaker having a sound radiating surface with different positional frequency characteristics, and a plurality of microphones acoustically isolated and juxtaposed from each other and opposed to said sound radiating surface at different positions and disposed in proximity thereto; and means for giving rotation to said loudspeaker at a required speed of revolution, whereby the sounds picked up by the respective microphones may be given fade-in and fade-out effects and also different frequency band characteristics, respectively.
Claim 9
Dependent Claim
92 words
A tremolo effect producing acoustic filter system comprising: a hermetically sealed box, said box including therein a loudspeaker having a sound radiating surface with different positional frequency characteristics, and a plurality of microphones acoustically isolated and juxtaposed from each other and opposed to said sound radiating surface at different positions and disposed in proximity thereto; and means for giving rotation to said loudspeaker at a required speed of revolution, whereby the sounds picked up by the respective microphones may be given fade-in and fade-out effects and also different frequency band characteristics, respectively.
Claim 10
Dependent Claim
25 words
The system according to claim 7, in which said loudspeaker is of a flat type and has a sound radiating surface of an asymmetrical configuration.
References Cited (Backward Citations)
US3346070A
Cited
US3506773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |