The property of the optical spectrum and imaging systems is analyzed based on the Wigner transformation and its property.
利用维格纳变换及其性质，分析了信号频谱及其成像光学系统的特性。
2
The formulas for the transformationof sound levels between linear spectrum and multiplex frequency band, or among various multiplex frequency bands, are derived and the corrected value is calculated.
推导线性谱声压级、倍频带声压级以及各倍频带声压级之间的转换公式，计算出修正值。
3
The trend of the future mobile communication is digital transformation speed raised and radio frequency spectrum resource used sufficiently.