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关于TIC5515评估板VC5505_FFT_Filter_Demo_2010-05-11例程频率问题

TIC5515评估板VC5505_FFT_Filter_Demo_2010-05-11例程的讲解了利用FFT乘积实现低痛滤波器的过程,但示例中的1K、3K、5KHz的正弦波声源测出来的频率是标称值的1/4,请问是何解?