First test of realtime FFT on Cortex M4 stm32f407. The DSP tests continue, the Digital Noise Reduction DNR module is ready, in tests the audio signal is taken from a yaesu ft817 sampled at 44kHz and digitally filtered at 12kHz before being processed by the DNR module with Spectral Subtraction technique widely used in modern RTX. By 73 de ik8yfw.

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