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MSP430FR5994: 官方例程256点实数FFT的结果怎么看?

Part Number: MSP430FR5994

运行transform_ex1_fft_fixed_q15例程,FFT结果应该还是在输入数组input里面吧?将这个结果以int16导出,用MATLAB画图,横坐标为

F=(0:256-1)*8192/256; %换算成实际的频率值
为什么看到的频率是400和4200?