Fractional Delay using Linear Interpolation

For a successful flanging effect, $M(n)$ must change smoothly over time:

• $M(n)$ should not have jumps in values associated with rounding to the nearest integer.

One of the simplest ways to handle fractional delay is by using linear Interpolation:

• the linear interpolator effectively ``draws a line'' between neighbouring samples, and returns the appropriate value on that line.

  Figure 2: Linear Interpolation.