Modulation: Used numpy functions to multiply samples by cosine at carrier frequency Demodulation: Used 2-means clustering to find threshhold (as seen in http://www.cs.utahedu/~piyush/teaching/4-10-print.pdf). Used quadrature demodulation as described in the writeup. Wrote a separate convolution function to use in demodulation; used numpy functions for speed. Built LPF as described in the writeup.