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Designing multi-stage multi-rates decimation filter

I'm trying to design multi-stages multi-rates decimation filter. I'm using the built-in labview vi (DFD NStage MRate Filter Design VI). To test the system, a sine wave is sampled with 30 KHz, then, decimated to 100S/s using three stages filter. However, the edges of the output signal are not smooth (sharpen). Kindly, give me a suggestion to solve this problem. Kindly, download the attached files for more information.   


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