Hi Alan, Theoretically you may compute FFT using 'divide & conquer' algorithm and apply CMSIS DSP FFT routines to 4096-sized buffers. The description of the algorithm can be found here: en.wikipedia.org/.../Cooley–Tukey_FFT_algorithm However, I wonder if the application and CMSIS DSP library will handle so much samples every 5 ms. Regards, adboc
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