The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 29, 2011
Filed:
May. 28, 2007
Taro Katayama, Kanagawa, JP;
Tsuyoshi Haga, Kanagawa, JP;
Taro Katayama, Kanagawa, JP;
Tsuyoshi Haga, Kanagawa, JP;
Panasonic Corporation, Osaka, JP;
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 (), to which an audio signal outputted from a playback apparatus () 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 () configured to receive an output signal of the first filter (), a second filter (), to which the audio signal from the playback device () is inputted, configured to pass a frequency band including the first-order resonance frequency of the interior, and a second sub-woofer (), to which an output signal of the second filter () is inputted, configured to be installed near a node of a first-order resonance mode of the interior.