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JP4: It is used for selecting the power feeding for the hardware echo cancellation module, by
default we choose the 3.3v; the module can also choose 5.0v for power feeding in the case that the
3.3v in the motherboard of PC is not enough for the module, but this phenomenon happens rarely.
For the latest version, the module does not need this jumper.
For Selecting 3.3v Power
For Selecting 5.0v Power