A digital diopter measuring instrument is described for lens spherical vertex power and cylindrical axis measurement. 本文论述了一种采用旋转编码器与莫尔条纹测长相结合进行眼镜片的顶点屈光度。
A simplified psychoacoustic model especially suitable for low cost implementation is introduced, which is proved to significantly reduce the coding com. 指出了一种简化的心理声学模型及其计算方法，适合于低成本编码器的需要。
