| 摘要 |
PROBLEM TO BE SOLVED: To lower the resonant frequency of a speaker system, to attenuate a peak at the resonant frequency and to flatten acceleration output frequency characteristics at a resonant frequency or higher. SOLUTION: When a DC resistor of a voice coil of a dynamic speaker unit is defined as Rv and nominal (representative) voice coil impedance is defined as Z0, this audio amplifier sets output impedance at frequency of 0Hz (DC) as approximately -Rv, sets output impedance at a high frequency reproduction threshold frequency as 10 or more times of Z0 and sets a feedback circuit so that output impedance in the meantime continuously changes. COPYRIGHT: (C)2004,JPO&NCIPI
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