根据供给它的控制信号，或起加法器作用或起减法器作用的一种逻辑元件。

A logic element designed to act as either an adder or a subtracter in accordance with the control signal applied to it.

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减法器（230）计算加法器（250）的输出和加法器（250）的输出的量化值之间的差以便确定量化误差。

The subtracter (230) calculates the difference between the output of the adder (250) and the quantized value of the output of the adder (250) to determine the quantization error.

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