没有前置放大器，软静音，有时面具极其微弱的信号。
Without a preamp, the soft mute can sometimes mask extremely weak signals.
硬盘驱动器控制信号发送到前置放大器和前置选择头部硬盘在目前的时刻需要。
HDD sends control signals to the preamp and the preamp selects the head which HDD needs at the current moment.
前置放大器与均衡器或滤波器跟在雪崩二极管检测器的后面以获得增益，线性信号处理及噪声宽带的抑制。
The avalanche photodiode detector is followed by a front-end amplifier and equalizer or filter to provide gain as well as linear signal processing and noise bandwidth redution.
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