In this paper, we discuss several improvements in sinusoidal coding. First, we present an analysis method which estimates windowed sinusoids to represent a segment of an input speech or audio signal. The window used in the analysis is the same magnitude-complementary window as is used in overlap-add synthesis, which makes analysis consistent with synthesis. It is hown how the overlapping nature of segments can be accounted for in the sinusoidal estimation. Second, we present techniques for optimization of sinusoidal parameters based on the squared difference between the input signal and reconstruction. Efficient methods for computation are also discussed. Experimental results verify that our procedures provide a significant improvement in reconstruction accuracy.
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