nrf_dsp_autocorr_i16()

int16_t nrf_dsp_autocorr_i16	(	const int16_t *	p_input,
		uint16_t	num,
		const uint8_t	lag,
		nrf_dsp_stat_ctx_i16_t *	p_ctx )

#include <include/nrf_edgeai/dsp/statistic/nrf_dsp_autocorr.h>

Calculate Autocorrelation value in the INT16 fixed-point vector.

Parameters

[in]	p_input	Pointer to the input vector
[in]	num	Number of samples in input vector
[in]	lag	Number of samples use for lag of signal
[in,out]	p_ctx	Optional pointer to the statistics context, this function will use p_ctx->value.sum and/or p_ctx->value.var for calculation if it exist, the calculated value of variance will be written to context for further use

Returns

int16_t Autocorrelation value in the vector, multiplied by NRF_DSP_PERCENTAGE_TO_INT_FACTOR