Vehicle electroacoustical transducing

Details Vehicle electroacoustical transducing Vehicle electroacoustical transducing

1991-01-03

1993-06-08

Gellner, Michael L.

Acoustics

Combined

181148, 181150, H05K 500

Patent

active

052181758

ABSTRACT:
A vehicle loudspeaker system includes a vehicle body having inside surfaces enclosing a passenger compartment. At least one elongated conduit has a proximal portion and a distal portion. A loudspeaker driver is disposed in the vehicle body outside the passenger compartment. The loudspeaker driver has a vibratile surface for generating sound pressure waves in response to electrical stimulation. The proximal portion of the elongated conduit is open to one side of the vibratile surface. The distal portion is open to the passenger compartment. The elongated conduit extends from the vibratile surface into the passenger compartment with an effective length corresponding substantially to a quarter wavelength at the lowest frequency of sound pressure waves to be transmitted between the vibratile surface and the passenger compartment. The loudspeaker driver is characterized by moving mass and an unloaded natural resonant frequency at a first bass frequency. The elongated conduit encloses a relatively large air mass sufficiently large to coact with the loudspeaker driver and present a load that effectively increases the moving mass so that the loudspeaker driver loaded by the air mass is characterized by a loaded natural resonant frequency at a second bass frequency significantly lower than the first bass frequency.

REFERENCES:
patent: 4493389 (1985-01-01), Del Rosario
patent: 4924962 (1990-05-01), Terai et al.

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