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    • 9. 发明申请
    • DRIVING OF PARAMETRIC LOUDSPEAKERS
    • 驱动参数扬声器
    • WO2012011039A1
    • 2012-01-26
    • PCT/IB2011/053183
    • 2011-07-18
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.LAMB, William, JohnAARTS, Ronaldus, Maria
    • LAMB, William, JohnAARTS, Ronaldus, Maria
    • H04R3/04
    • H04R3/04H04R2217/03H04R2400/00
    • A parametric loudspeaker system comprises a pre-compensator (305) for generating a pre-compensated envelope signal by applying a pre-compensation to the input audio signal where the pre-compensation compensates for distortion of in-air demodulation of the modulated ultrasound signal. A pre-modulator (307) generates a complex base band signal generating a phase signal from the pre-compensated envelope signal using a predetermined function for determining a phase signal from an amplitude signal such that the corresponding complex signal has either suppressed negative or positive frequencies. The complex base band signal is then generated to have an amplitude corresponding to the pre-compensated envelope signal and a phase corresponding to the phase signal. A modulator (309) quadrature modulates the complex base band signal on an ultrasonic quadrature carrier and an output circuit (311) drives the ultrasound transducer (301) from the modulated signal. The invention may allow effective yet low resource pre-compensation for a suppressed or single sideband modulated modulated ultrasound signal.
    • 参数化扬声器系统包括预补偿器(305),用于通过对输入音频信号施加预补偿来产生预补偿包络信号,其中预补偿补偿调制超声信号的空中解调失真。 预调制器(307)使用用于从幅度信号确定相位信号的预定函数产生从预补偿包络信号产生相位信号的复基带信号,使得相应的复信号具有抑制的负频率或正频率 。 然后生成复基带信号以具有对应于预补偿包络信号的幅度和对应于相位信号的相位。 调制器(309)正交调制超声波正交载波上的复基带信号,并且输出电路(311)从调制信号驱动超声换能器(301)。 本发明可以允许抑制或单边带调制调制的超声信号的有效但低资源预补偿。