...低频参数；高频参数 [gap=1169]eywords operational amplifier ；performance parameters ；the appplication circuit； high-frequency parameters ；low-frequency parameters ..
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On the low-frequency parameters of speaker is analyzed, draws the affecting relation of strengthening rib and equivalent compliance , effective vibration area of diaphragm.
分析了膜片加强筋的筋脉、剖面形状、面形状、角度等对扬声器低频参数的影响，得出了加强筋与膜片等效顺性以及有效振动面积之间的关系。
A frequency domain characterization method using low frequency ultrasound is put forward to estimate parameters of ultra thin elastic layers, such as: the sound velocity, thickness and density.
本文提出一种定量无损估计超薄弹性层声速、厚度和密度参数的低频超声波频域定征方法。
The methods of parameters identification are analyzed and low-order equivalent system is identified by frequency domain maximum likelihood method and least square method.
分析了等效系统参数辨识方法，采用最小二乘法与频域极大似然法求解先进飞机的低阶等效系统。
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