Acoustics – Sound-modifying means – By wave interference
Patent
1978-03-29
1979-12-11
Griffin, Donald A.
Acoustics
Sound-modifying means
By wave interference
F01N 106
Patent
active
041778740
ABSTRACT:
The invention relates to active acoustic absorber devices for absorbing the sounds which are emitted by a emitter source and which propagate therefrom, along a pipe. An absorber according to the invention comprises an acoustic tripole which is composed of two auxiliary acoustic sources which constitute a dipole and of a third auxiliary source which constitutes a unipole, these three sources being located in the same acoustic chamber, which chamber is disposed outside the pipe, opens therein through three orifices aligned parallel to the longitudinal axis of the pipe and comprises a transverse plane of symmetry perpendicular to the axis of the pipe.
REFERENCES:
patent: 3565209 (1971-02-01), Babcock et al.
patent: 3826870 (1974-07-01), Wurm et al.
patent: 3936606 (1976-02-01), Wanke
Angelini Theophile A.
Canevet Georges
Carbone Bernard
Jessel Maurice J.
Mangiante Gerard A.
Agence Nationale de Valorisation de la Recherche (ANVAR)
Eslinger Lewis H.
Fuller Benjamin R.
Griffin Donald A.
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