[mus422] Hw3 solutions

[Craig Sapp]

Hello Music 422 class,

Attached are solutions to HW3 giving illustrations of the 1 kHz
sinewave peak aligned in SPL between the MDCT and the DFT (plot 4 on
page 2 illustrates the 1/2 bin shift between the two transforms),
including Kaiser-Bessel Derived windows using alpha of 1 and 4.  Also
on page 3 are a pair of functions which can be used to calculate the
reference amplitude for a given window/transform/transform size
without the need to keep track of normalization factors in order to
display the transform with dB_spl.

-=+Craig
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