Szukana fraza: [Abstract = "Recently several papers have related the production of sampling and interpolating sequences for multi\-band signals to the solution of certain kinds of Wiener\-Hopf equations. Our approach is based on connections between exponential Riesz bases and the controllability of distributed parameter systems. For the case of two\-band signals we derive an operator whose invertibility is equivalent to the existence of a sampling and interpolating sequence, and prove the invertibility of this operator."]

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