- ... kHz.
^{1} - We arbitrarily define the 20% guard band as a
percentage of half the sampling rate actually used, not as 20% of the
desired 20 kHz bandwidth which would call for a 48 kHz sampling rate.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

- ... bound
^{2} - Thanks to Magnus Lundin for contributing this formulation, which
sharpens the bound derived in [21].
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .