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    • 4. 发明专利
    • BR9700908A
    • 1998-12-08
    • BR9700908
    • 1997-02-06
    • YANG YI FU
    • YANG YI-FU
    • H04R1/28H04R3/04H04R5/00
    • An acoustic transmission line speaker enclosure with concentric cylindrical structures establishes acoustic coupling between a rear-traveling sound wave and a surrounding air mass. Inherent rigidity or high bending resistance of the cylindrical structure allows use of very thin walled cylinders without a massive and large overall enclosure. According to one aspect of the invention, an outer-most one of said cylinders includes wall structures adapted for coupling the rear-traveling sound wave therethrough to the surrounding air mass in phase with a forward-traveling sound wave from said speaker enclosure. An audio amplifier tunable to a listening room removes very low narrow frequency band components of an audio signal. Listening room cavity resonance is measured by injecting a frequency-varying sound wave into the listening room while detecting peak sound energy within the room. The filter the eliminates from the audio signal frequencies associated with listening room cavity resonance.
    • 8. 发明专利
    • DE102008008157A1
    • 2008-08-14
    • DE102008008157
    • 2008-02-08
    • LIANG CHYONG-YUYANG YI-NAN
    • LIANG CHYONG-YUYANG YI-NAN
    • E03D9/00E03D13/00
    • A hygienic apparatus includes a urinal, a toilet bowl, and a water-storing device including a housing body interconnecting the urinal and the toilet bowl, a water tank disposed in the housing body, a water-feeding tube allowing flow of water into the water tank therethrough. A drain tube unit is in fluid communication with the urinal and the toilet bowl. A flush unit includes a urinal-flushing tube in fluid communication with the water tank and the urinal, and a toilet-flushing tube in fluid communication with the water tank and the toilet bowl. A swivel mechanism includes a base, a vertical shaft disposed fixedly on the base and extending into an assembly of the urinal, the toilet bowl, and the water-storing device, and a driving unit operable to drive rotation of the assembly of the urinal, the toilet bowl, and the water-storing device relative to the base about the vertical shaft.