// Sinc
//
// sinc - Normalized Sinc function
//
// y[t] = x[t] == 0 ? 1 : sin( pi * x[t] ) / ( pi * x[t] )
//
// X_n - 1
// Y_n - 1
// C_n - 0


#include <math.h>
#include "ts.h"



ts_parameter_t const ts_sinc_p = { .n_inputs = 1, .n_outputs = 1, .n_constants = 0, .params_size = 0 };


uint_t ts_sinc_offset( ts_constant_t const *c )
{
	( void )c;
	return ( 0 );
}

int ts_sinc(
	fp_t * const *y, uint_t y_n,
	fp_t const * const *x, uint_t x_n,
	uint_t n, ts_constant_t const *c
)
{
	TS_PROLOGUE( ts_sinc_p );
	(void)c;
	for( uint_t i = 0; i < n; ++i )
	{
		fp_t xi = x[0][i];
		if ( xi == 0 )
			y[0][i] = 1;
		else
		{
			fp_t pix = PI * xi;
			y[0][i] = sin( pix ) / pix;
		}
	}
	return 0;
}