Thru Box

• With a thru box, we define a waveshaping transfer function that will do nothing to the signal.

• What is the shape of such a transfer function?

• Though this may not seem very interesting, it's a good first step in understanding of how we use our waveshaping function and also to make sure we've properly implemented linear interpolation.

  fs = 8;
  dur = 1;
  nT = [0:1/fs:dur-1/fs];
  N = length(nT);
  x = cos(2*pi*(1/dur)*nT);     % input
  xsc = (x + abs(min(x)));      % offset x
  xsc = xsc/max(xsc)*(N-1) + 1; % scale x
  w = linspace(-1, 1, N);       % waveshaper
  y = lininterp(w, xsc);
  

  Figure 3: Thru box.