WM8961的整合式电荷泵(charge pump)能在驱动耳机负载时提供一个接地参考(ground referenced)输出，因此可免除采用直流阻隔电容(DC blocking capacitors)，明显的节省电路板空间和音讯子系统的物料清单成本。
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not referenced to ground 不能以接地作为参考
A floating source is a source in which the voltage signal is not referenced to any common ground, such as earth or building ground.
未接地信号源的信号(比如电压)没有相应的、诸如大地或建筑物这样的绝对参考点。
The single-end connection is useful when a signal is referenced to ground.
当信号值是相对地而言的，则使用单端连接。
A grounded source is one in which the voltage signals are referenced to a system ground, such as earth or building ground.
接地信号源的电压信号以系统地线作为参考点，比如建筑物或大地。
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