These are the audio-mic USB adaptors which allow two mic
inputs at the same time.
The picture shown on the left is the experiment setup. The
microphone in the far left corner measures the noise and the
microphone on the right measures the primary input, which is
the corrupted source. The speakers that play the noise must
be the same set and the two microphones must stay
The real time adaptive noise cancellation is not so
different from the second demo "Field Measurement" except
that the the Simulink module is used as the vector
concatenation and communication interface between the source
and the FPGA.