Data Interpolation and Its Effects on Digital Sound Quality - McMurry ...

23section, no sound wave is exactly perfect save a single constant steady musicalnote, thus these results aren’t accurate to model most sounds.In testing the imperfect sound file, I found the interpolation to behaveerratically. As mentioned in the previous chapter, the higher the degree thepolynomial, generally the higher the absolute maxima <strong>and</strong> minima become. Thisis demonstrated by the following image, where the darkler line is the actualsound wave, <strong>and</strong> the lighter line is the interpolating polynomial:3.3 Cubic Spline ResultsFor results of the perfect sound wave, refer to the above section 3.2, asthe results were identical to that of performing polynomial interpolation on thewave.For the imperfect sound wave using the first method, overall the resultswere fairly good, though there are still some areas where the error is quite large.