Electrical audio signal processing systems and devices – Loudspeaker feedback
Patent
1989-09-27
1992-04-28
Isen, Forester W.
Electrical audio signal processing systems and devices
Loudspeaker feedback
381159, 381188, 381 90, 181160, 181199, H04R 300
Patent
active
051094223
ABSTRACT:
An acoustic apparatus comprises a Helmholtz resonator which has a cavity and an open duct port for causing the cavity to communicate with an external region thereof and a vibrator which is arranged in the resonator to drive the resonator. In a first aspect, the open duct port comprises an air permeable member having a proper acoustic resistance and a viscoelastic member having no air permeability so that noise caused by an open duct resonant, wind noise, turbulence or the like is prevented. In a second aspect, a viscoelastic member is disposed at the mounting portion between the open duct port and a cabinet defining the cavity so that transmission to the cabinet of derivative vibration causing at the open duct port is prevented. In a third aspect, the portion, opposite to the open duct port, of an ornament grille attached to the front surface of the acoustic apparatus is given a larger air permeability than other portions of the grille so that wind noise when the grille is attached before the open duct port is prevented. Thus, noise generated when the resonator is driven is prevented or eliminated and distortion characteristics of the apparatus are improved.
REFERENCES:
patent: 4126204 (1978-11-01), Ogi et al.
patent: 4135600 (1979-01-01), Ogi et al.
patent: 4146744 (1979-03-01), Veranth
patent: 4624337 (1986-11-01), Shavers
"B&W 801 Matrix Series 2 Professional Monitor Loudspeaker" by Lewis Lipnick, A reprint from Stereophile, vol. 10, No. 9, Dec. 1987.
Isen Forester W.
Yamaha Corporation
LandOfFree
Acoustic apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Acoustic apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Acoustic apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1253410