#1st Order Low Pass Delta Sigma Modulator, as per pp. 33-34, 110 of Thesis
V1 u 0 STDIN
@a1 v u y 1.0 -1.0
@a2 x v x2 1.0 1.0
@d2 x2 x 1

q1 y 0 x 0 1b

.step 1.0
.nprint v(y) 
.fft window hann v(y) >1st.fft

.lib 1b.lib