Electrical audio signal processing systems and devices – Vehicle
Patent
1992-03-02
1992-12-08
Dwyer, James L.
Electrical audio signal processing systems and devices
Vehicle
381 24, 381 90, 381205, 181144, 181199, H04B 100, H04R 500, H04R 102, H04R 2500, H05K 500, A47B 8106
Patent
active
051704358
ABSTRACT:
A loudspeaker system for radiation into the passenger compartment of a vehicle has one or more elongated acoustic waveguides to efficiently transfer sound pressure energy from a loudspeaker driver outside the compartment into the compartment. Preferred embodiments feature two elongated acoustic waveguides separated by the loudspeaker driver mounted on a hard baffle panel. One waveguide has an effective length of one quarter wavelength at the lowest frequency desired to be reproduced by the loudspeaker driver, and the other waveguide has an effective length three times that of the first waveguide. One or both waveguides may be folded upon itself. The loudspeaker system is driven through circuitry providing reduced system response at frequencies that may cause the deflection of the loudspeaker to exceed its maximum limits. This circuitry includes a high pass filter for transmitting spectral components above the lowest frequency to be reproduced, and a notch filter centered at a frequency where the loudspeaker cone excursion characteristic is a maximum. Another circuit includes boosts the audio spectral components, reduced by the notch filter, into the passenger compartment through another loudspeaker system, comprising a ported enclosure having a port resonance at the notch frequency.
REFERENCES:
patent: 2301744 (1942-11-01), Olsen
patent: 4628528 (1986-12-01), Bose
patent: 4924962 (1990-05-01), Terai
Greenberger Hal
Rosen Michael D.
Bose Corporation
Chiang Jack
Dwyer James L.
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