Audio playback system

Electrical audio signal processing systems and devices – Vehicle

Reexamination Certificate

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Details

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.

REFERENCES:
patent: 7477755 (2009-01-01), Saiki et al.
patent: 7760890 (2010-07-01), Furge et al.
patent: 2004/0252844 (2004-12-01), Christensen et al.
patent: 2006/0098827 (2006-05-01), Paddock et al.
patent: 53-135303 (1978-11-01), None
patent: 1-137800 (1989-05-01), None
patent: 4-207499 (1992-07-01), None
patent: 4-299697 (1992-10-01), None
patent: 4-299697 (1992-10-01), None
patent: 7-131884 (1995-05-01), None
patent: 8-331682 (1996-12-01), None
Japan Office action, mail date is Jul. 5, 2011.
English language Abstract of JP 7-131884 A.

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