The frame set of a window $\phi\in L^2(\mathbb{ R})$ is the subset of all lattice parameters $(\alpha, \beta)\in \mathbb{ R}^2_+$ such that $\mathcal{ G}(\phi,\alpha,\beta)=\{ e^{ 2\pi i\beta m\cdot}\phi(\cdot-\alpha k) : k, m\in\mathbb{ Z}\}$ forms a frame for $L^2(\mathbb{ R})$. In this paper, we investigate the frame set of B-splines, totally positive functions, and Hermite functions. We derive a sufficient condition for Gabor frames using the connection between sampling theory in shift-invariant spaces and Gabor analysis. As a consequence, we obtain a new frame region belonging to the frame set of B-splines and Hermite functions. For a class of functions that includes certain totally positive functions, we prove that for any choice of lattice parameters $\alpha, \beta>0$ with $\alpha\beta<1,$ there exists a $\gamma>0$ depending on $\alpha\beta$ such that $\mathcal{ G}(\phi(\gamma\cdot),\alpha,\beta)$ forms a frame for $L^2(\mathbb{ R})$.
Categories: math.FA