sigcos

Efficient computing of a cosinusoid.

Namespace: dsp

Prototype

static Vecf sigcos(float f, int n)

Parameters

f	Normalized frequency of the cosinus (between -0.5 et 0.5)
n	Number of points to generate.

Returns

Real vector defined by: \[ y_k = \cos\left(2\pi k f\right),\quad k = 0\dots n-1 \]

Description

This function generates a real cosinusoidal signal, based on an harmonic oscillator (which is far more efficient than by using the trigonometric functions of the standard library). Note however that if \(n\) is a big number, there can be some divergence, both in gain and in phase.

Example


  // Fréquence = 0.01, 200 échantillons
  soit x = sigcos(0.01, 200);
  Figure f;
  f.plot(x);