Collaboration diagram for DSPF_sp_iirlat:
void | DSPF_sp_iirlat (const float *x, int nx, const float *restrict k, int nk, float *restrict b, float *restrict y) |
void DSPF_sp_iirlat | ( | const float * | x, | |
int | nx, | |||
const float *restrict | k, | |||
int | nk, | |||
float *restrict | b, | |||
float *restrict | y | |||
) |
This routine implements a real all-pole IIR filter in lattice structure (AR lattice). The filter consists of nk lattice stages. Each stage requires one reflection coefficient k and one delay element b. The routine takes an input vector x[] and returns the filter output in y[]. Prior to the first call of the routine the delay elements in b[] should be set to zero. The input data may have to be pre-scaled to avoid overflow or achieve better SNR. The reflections coefficients lie in the range -1.0 < k < 1.0. The order of the coefficients is such that k[nk-1] corresponds to the first lattice stage after the input and k[0] corresponds to the last stage.
x[nx] | Input vector. | |
nx | Length of input vector. | |
k[nk] | Reflection coefficients. | |
nk | Number of reflection coefficients/lattice stages. | |
b[nk+1] | Delay line elements from previous call. Should be initialized to all zeros prior to the first call. | |
y[nx] | Output vector. |