Trigonometric Polynomial Routines

em	Trigonometric polynomial basis function.
gen_dirichlet_coeffs	Generate random Dirichlet coefficients for a real signal.
gen_trig_poly	Construct a trigonometric polynomial with specified Dirichlet coefficients.
gen_trig_poly_2d	Construct a 2D trigonometric polynomial.
get_dirichlet_coeffs	Compute the Dirichlet coefficients of a trigonometric polynomial.
scale_down_coeffs	Scale down Dirichlet coefficients.