nrf_dsp_cfft_radix4by2_i16()

void nrf_dsp_cfft_radix4by2_i16	(	const nrf_dsp_cfft_i16_t *	p_cfft,
		int16_t *	p_input )

#include <include/nrf_edgeai/dsp/transform/fft/nrf_dsp_fft_i16.h>

The fixed-point 16-bit complex FFT uses a mixed-radix algorithm. Multiple radix-4 stages are performed along with a radix-1 stage, as needed. The algorithm supports lengths of [32, 128, 512, 2048] and each length uses a different twiddle factor table.

Note

The FFT computes in-place and will modify input buffer with FFT results. The results will be written to input array in the interleaved fashion:

{real[0], imag[0], real[1], imag[1],...} 

Parameters

[in]	p_cfft	Pointer to instance of complex FFT structure nrf_dsp_cfft_i16_t
[in,out]	p_input	Pointer to buffer with input samples