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    • 11. 发明授权
    • Waveguide electroacoustical transducing
    • 波导电声转换
    • US5170435A
    • 1992-12-08
    • US844893
    • 1992-03-02
    • Michael D. RosenHal Greenberger
    • Michael D. RosenHal Greenberger
    • B60R11/00B60R11/02H04R1/28H04R1/30H04R3/00H04R3/04H04R5/02
    • H04R1/2857B60R11/0217H04R1/30H04R3/007H04R3/04H04R5/02B60R2011/0036H04R2499/13
    • 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.
    • 用于辐射到车辆的乘客舱中的扬声器系统具有一个或多个细长的声波导,以有效地将声压能量从隔室外的扬声器驱动器传输到隔室中。 优选的实施例具有由安装在硬挡板上的扬声器驱动器分开的两个细长声波导。 一个波导具有期望由扬声器驱动器再现的最低频率的四分之一波长的有效长度,而另一个波导具有三倍于第一波导的有效长度。 一个或两个波导可以自身折叠。 扬声器系统通过电路驱动,在可能导致扬声器偏转超过其最大极限的频率下提供降低的系统响应。 该电路包括用于传输要再现的最低频率以上的频谱分量的高通滤波器和以扬声器锥偏移特性为最大的频率为中心的陷波滤波器。 另一个电路包括通过另一个扬声器系统将由陷波滤波器减小的音频频谱分量提升到乘客舱内,该扬声器系统包括具有在陷波频率处的端口谐振的端口外壳。