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This paper presents a fast and efficient method to suppress (i.e. not to unwrap but only to remove) depth ambiguity for Time-of-Flight sensors. Depth and amplitude data for each pixel is obtained by correlating the emitted signal and the reflected signal. Each depth data is classified according to predetermined depth levels and the average amplitude with neighboring pixels is used to determine ambiguous depth beyond the maximum measurable depth. Different amplitude threshold values are used according to the classified depth for the accurate suppression. The proposed method does not require complex computation for edge detection and object segmentation as compared to object segmentation based method. The comparison simulation results demonstrate that the proposed method suppresses the depth ambiguity effectively.