公开(公告)号：US20100254026A1

公开(公告)日：2010-10-07

申请号：US12647138

申请日：2009-12-24

申请人： Seong-su PARK ,  Ichiro Morishita ,  Soo-han Park ,  Young-man Ahn ,  Byeong-hyeon Yu ,  Jong-il Kim ,  Jung-woo Hong ,  Su-hyun Kim

发明人： Seong-su PARK ,  Ichiro Morishita ,  Soo-han Park ,  Young-man Ahn ,  Byeong-hyeon Yu ,  Jong-il Kim ,  Jung-woo Hong ,  Su-hyun Kim

IPC分类号： G02B13/18 ,  G02B3/02

CPC分类号： G02B3/04 ,  G11B7/1374 ,  G11B7/13922

摘要： An object lens for an optical disk may include an aspherical lens surface, and an aspherical equation, which may be applied to form the aspherical lens surface may include two 2nd order function terms. Accordingly, a lens, which has a high numerical aperture (NA) and also has a small flexure on a lens surface or aberration, is provided.

摘要翻译： 用于光盘的物镜可包括非球面透镜表面，并且可用于形成非球面透镜表面的非球面方程可以包括两个二阶函数项。 因此，提供了具有高数值孔径（NA）并且在透镜表面上具有小弯曲或像差的透镜。

公开(公告)号：US5402495A

公开(公告)日：1995-03-28

申请号：US133662

申请日：1993-10-07

申请人： Jong-il Kim

发明人： Jong-il Kim

IPC分类号： G01R27/28 ,  H04R29/00 ,  H04B15/00

CPC分类号： H04R29/001

摘要： There is provided an improved apparatus and method which include precisely adjustable digital circuitries employing psychoacoustic modeling so that the results obtained have a best consistency with actual human auditory perception. The apparatus comprises a first estimator for estimating a power density spectrum of an input digital audio signal to the audio system; a detector for determining a masking threshold depending on the power density spectrum of the input digital audio signal as an audible limit reflecting human auditory faculty; a second estimator for estimating a power density spectrum of an error signal representative of the difference between the input digital audio signal and its output digital audio signal from the audio system; and a third estimator for estimating the power density spectrum of the error signal which exceed the masking threshold and for calculating a perceptual spectrum distance(PSD) representative of the audio distortion.

摘要翻译： 提供了一种改进的装置和方法，其包括使用心理声学建模的精确可调数字电路，使得获得的结果与实际人类听觉感知具有最佳一致性。 该装置包括：第一估计器，用于估计音频系统的输入数字音频信号的功率密度谱; 用于根据输入的数字音频信号的功率密度谱确定掩蔽阈值作为反映人类听觉系的听觉极限的检测器; 第二估计器，用于估计表示来自音频系统的输入数字音频信号与其输出的数字音频信号之间的差异的误差信号的功率密度谱; 以及第三估计器，用于估计超过掩蔽阈值的误差信号的功率密度谱，并用于计算表示音频失真的感知频谱距离（PSD）。