This paper investigates the fine structure of the Gabor frame generated by the B-spline B 3 . In other words, one extends the known part of the Gabor frame set for the 3-spline with the construction of the compactly supported dual windows. The frame set of the function B 3 is the subset of all parameters ( a , b ) ∈ R 2 + for which the time-frequency shifts of B 3 along a Z × b Z form a Gabor frame for L 2 (R).
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