Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1975-06-19
1977-07-12
Olms, Douglas W.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
84 125, 181143, G10H 104
Patent
active
040355829
ABSTRACT:
A tremolo effect producing system comprises at least one electro-acoustic transducer such as a loudspeaker for converting an electrical audio signal to a sound, at least one acousto-electrical transducer such as a microphone for converting sound to an electrical signal and disposed so as to face the loudspeaker, and at least one sound shielding member rotatably mounted between the above-mentioned two transducers and having sound transmitting openings or cutouts whereby sounds from the speaker will be periodically and/or individually interrupted with fade-in and fade-out effects as said member is rotated. These transducers and sound shielding member are sealed in a closed housing. Thereby the sound wave emitted from the speaker through the openings or cutouts of the rotating member is converted to an electrical signal with natural tremolo effects by the microphone. The thus-produced signal may be mixed with an audio signal with non-tremolo effect and amplified and reproduced by a loudspeaker.
REFERENCES:
patent: RE23323 (1951-01-01), Leslie
patent: 2287105 (1942-06-01), Kannenberg
patent: 2450139 (1948-09-01), Hartsough
patent: 2869669 (1959-01-01), Leslie
patent: 3346070 (1967-10-01), Hare
patent: 3385394 (1968-05-01), Gundlach
patent: 3716648 (1973-02-01), Takeyama
patent: 3876834 (1975-04-01), Suzuki
Nippon Gakki Seizo Kabushiki Kaisha
Olms Douglas W.
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