dsps_corr_f32_ansi.c File Reference

#include "dsps_corr.h"

Include dependency graph for dsps_corr_f32_ansi.c:

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Functions
esp_err_t	dsps_corr_f32_ansi (const float *Signal, const int siglen, const float *Pattern, const int patlen, float *dest)
	Correlation with pattern.

Function Documentation

dsps_corr_f32_ansi()

esp_err_t dsps_corr_f32_ansi	(	const float *	Signal,
		const int	siglen,
		const float *	Pattern,
		const int	patlen,
		float *	dest )

Correlation with pattern.

The function correlate input sigla array with pattern array. The implementation use ANSI C and could be compiled and run on any platform

Parameters

[in]	Signal	input array with signal values
[in]	siglen	length of the signal array
[in]	Pattern	input array with pattern values
[in]	patlen	length of the pattern array. The siglen must be bigger then patlen!
	dest	output array with result of correlation

Returns

• ESP_OK on success
• One of the error codes from DSP library (one of the input array are NULL, or if (siglen < patlen))

Definition at line 17 of file dsps_corr_f32_ansi.c.

{
    if (NULL == Signal) {
        return ESP_ERR_DSP_PARAM_OUTOFRANGE;
    }
    if (NULL == Pattern) {
        return ESP_ERR_DSP_PARAM_OUTOFRANGE;
    }
    if (NULL == dest) {
        return ESP_ERR_DSP_PARAM_OUTOFRANGE;
    }
    if (siglen < patlen) {
        return ESP_ERR_DSP_PARAM_OUTOFRANGE;
    }
 
    for (size_t n = 0; n <= (siglen - patlen); n++) {
        float k_corr = 0;
        for (size_t m = 0; m < patlen; m++) {
            k_corr += Signal[n + m] * Pattern[m];
        }
        dest[n] = k_corr;
    }
    return ESP_OK;
}

References ESP_ERR_DSP_PARAM_OUTOFRANGE, ESP_OK, m, and n.