An improvement to the linear interpolation technique can be made by multiplying the linear interpolator by
, which, in the time-space domain, corresponds to
moving the center of the *sinc ^{2}* function to

(4) |

In Figure 3, we show the implement of this operator. This result is better
than Figure 1 and Figure 2,
i.e. the artifacts are still obvious for the top and bottom impulse responses,
because the amplitude of the *sinc ^{2}* function varies with time and space.
Only the original value at the center of the section
is not affected by the artifact because for , the wraparound
is multiplied by a zero value of the

11/16/1997