Harlan's 10-point interpolation

Harlan 1982 designed a 10-point sinc interpolator as follows:

$$C_{n+ \delta n}= {1 \over 6 \pi } \exp {(-i \pi \delta n)} \... ...\sum_{m=-4}^{5}C_{n+m}(6-\vert\delta n - m\vert)/(\delta n - m)$$ (5)

In the time-space domain this interpolation corresponds to multiplication by a rounded rectangle function centered at T/2. This operator almost avoids the wraparound effect. Figure 4 shows the impulse response of Harlan's 10-point interpolator. We can hardly find any artifacts in this display.