MAS.632 Conversational Computer Systems - MIT OpenCourseWare

40 VOICE COMMURItATION WITH (OMPUTERS
Figure 3.3. The wheel has rotated far enough that a spoke has moved forward
to the position previously occupied by the next spoke.
Figure 3.4. The wheel has rotated still further Each spoke has moved
just beyond the position formerly occupied by the next.
spokes in the time between frames. If aliasing is to be avoided, the sampling
theorem suggests that this must happen at no more than one-half the sampling
rate. This implies that each spoke must rotate no more than one-half the distance
to the next spoke between frames; with eight spokes filmed at 24 frames per
second, this corresponds to 1% wheel revolutions per second. A characteristic