Figure(3.2.7)

We have,

and

Let us compare the relative efficiencies of rectangular and hexagonal schemes when they are used to sample a 2-D continuous signal which is circularly bandlimited.

i.e.    

or   

Figure(3.2.8)

The circular baseband shown above, can be inscribed in a square with sides of length 2W or a hexagon with sides of length . Consequently this signal can be embedded via square or a hexagon base-band. Periodic replication of the square baseband corresponds to sampling continuous signal on a rectangular raster.

This is shown in Figure below.

Figure(3.2.9)

ontinued in the next slide)