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This paper deals with a synthesis problem for active noise control systems for one-dimensional duct. Since it is important to reduce the cost of the active noise control systems for practical use, the sampled-data H∞ control synthesis is applied to design a digital controller with long sampling period. As a conventional synthesis method, continuous-time H∞ control based synthesis is also applied, where the Tustin transformation is used to discretize continuous-time H∞ controllers. The experimental results show that the conventional method work well for short sampling period, however, when the sampling period is not short enough, the system loose stability. In contrast, the sampled-data H∞ control synthesis does not cause such problems, and longer sampling period is achieved without performance degradation compared to the conventional method.