The problem with noise shaping is that small signals get lost - any signal below the noise shaper noise floor is lost information.
噪音整形产生的问题，就是小信号的损失——信号小于噪音整形本底噪音的就是损失的信息量。
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The design of I/V converter module circuit, ADC module circuit, speed signal per revolution filter shaping module circuit, remote display module circuit and interface circuits are expounded.
This paper designs an optical system and some lenses for the BD OPU, including collimator lens, beam shaping lens for laser beam shaping, and cylinder lens for signal detecting.