Signal and Noise Generator

4.3.1 LEDs

There are five LEDs on this board:

D1 ON indicates the current generated signal is sine wave.
D2 ON indicates the current generated signal is square wave.
D3 ON indicates the current generated signal is DC voltage.
D1, D2 and D3 all OFF indicates the current generated signal is FSK.
D4 ON indicates white noise is mixed to the current signal.
D5 ON indicates periodic noise is mixed to the current signal.

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