You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
29 lines
897 B
29 lines
897 B
//
|
|
// Created by Nicholas Newdigate on 24/05/2021.
|
|
//
|
|
#ifndef TEENSY_RESAMPLING_SDREADER_INTERPOLATION_H
|
|
#define TEENSY_RESAMPLING_SDREADER_INTERPOLATION_H
|
|
|
|
#include <cinttypes>
|
|
#include <math.h>
|
|
|
|
|
|
enum ResampleInterpolationType {
|
|
resampleinterpolation_none = 1,
|
|
resampleinterpolation_linear = 2,
|
|
resampleinterpolation_quadratic = 3,
|
|
};
|
|
|
|
struct InterpolationData
|
|
{
|
|
int16_t x, y;
|
|
};
|
|
|
|
// https://en.wikipedia.org/wiki/Lagrange_polynomial
|
|
// https://www.geeksforgeeks.org/lagranges-interpolation/
|
|
// function to interpolate the given data points using Lagrange's formula
|
|
// xi corresponds to the new data point whose value is to be obtained
|
|
// n represents the number of known data points
|
|
int16_t interpolate(InterpolationData *f, double xi, int n);
|
|
int16_t fastinterpolate(int16_t d1, int16_t d2, int16_t d3, int16_t d4, float x);
|
|
#endif //TEENSY_RESAMPLING_SDREADER_INTERPOLATION_H
|
|
|