他们检查输入和输出信号质量，确保弱信号被替换为储备信号。
They check the input and output quality ensuring that weak signals are shifted to a reserve one.
实际的信号失真水平取决于输入和输出信号的幅度，以及输出负载阻抗。
The actual signal distortion levels depend upon input and output signal amplitude, as well as the output load impedance.
它也指挥着CPU和输入输出设备之间的控制信号。
It also directs these control signals between the CPU and input and output devices.
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