gridrec                package:Rwave                R Documentation

_R_e_c_o_n_s_t_r_u_c_t_i_o_n _f_r_o_m _a _R_i_d_g_e

_D_e_s_c_r_i_p_t_i_o_n:

     Reconstructs signal from sample of a ridge, in the Gabor case.

_U_s_a_g_e:

     gridrec(gtinput, node, phinode, nvoice, freqstep, scale, Qinv,
     epsilon, np, real=F, check=F)

_A_r_g_u_m_e_n_t_s:

 gtinput: Gabor transform, output of `cgt'. 

    node: time coordinates of the ridge samples. 

 phinode: frequency coordinates of the ridge samples. 

  nvoice: number of different frequencies. 

freqstep: sampling rate for the frequency axis. 

   scale: scale of the window. 

    Qinv: inverse of the matrix Q of the quadratic form. 

 epsilon: coefficient of the Q_2 term in reconstruction kernel 

      np: number of samples of the reconstructed signal. 

    real: if set to T, uses only constraints on the real part of the
          transform. 

   check: if set to T, computes `cgt' of reconstructed signal. 

_D_e_t_a_i_l_s:

_V_a_l_u_e:

     Returns a list containing the reconstructed signal and the chained
     ridges. 

     sol: reconstruction from a ridge. 

       A: <gaborlets,dualgaborlets> matrix. 

     lam: coefficients of dual gaborlets in reconstructed signal. 

dualwave: array containing the dual gaborlets. 

gaborets: array of gaborlets located on the ridge samples. 

 solskel: Gabor transform of sol, restricted to the ridge. 

inputskel: Gabor transform of signal, restricted to the ridge. 

_R_e_f_e_r_e_n_c_e_s:

     See discussions in the text of ``Practical Time-Frequency
     Analysis''.

_S_e_e _A_l_s_o:

     `sridrec', `gregrec', `regrec', `regrec2'.

