Electrical audio signal processing systems and devices – Vehicle
Reexamination Certificate
2007-05-28
2011-11-29
Nguyen, Dao H (Department: 2818)
Electrical audio signal processing systems and devices
Vehicle
C381S017000, C381S092000, C381S300000, C381S302000, C381S316000, C700S094000
Reexamination Certificate
active
08068617
ABSTRACT:
Provided is an audio playback system, which reduces a restriction on a place of installation and which reduces the dispersion of characteristics of sound pressures in a low frequency range due to the seats in a passenger interior of a vehicle so that a comfortable bass sound can be enjoyed at any seat. The audio playback system comprises a first filter (108), to which an audio signal outputted from a playback apparatus (107) is inputted, configured to pass a frequency band lower than a first-order resonance frequency of the passenger interior of the vehicle, a first sub-woofer (104) configured to receive an output signal of the first filter (108), a second filter (109), to which the audio signal from the playback device (107) is inputted, configured to pass a frequency band including the first-order resonance frequency of the interior, and a second sub-woofer (105), to which an output signal of the second filter (109) is inputted, configured to be installed near a node of a first-order resonance mode of the interior.
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Japan Office action, mail date is Jul. 5, 2011.
English language Abstract of JP 7-131884 A.
Haga Tsuyoshi
Katayama Taro
Greenblum & Bernstein P.L.C.
Nguyen Dao H
Panasonic Corporation
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