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bw_iir{1,2} progress

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This commit is contained in:
Stefano D'Angelo 2025-01-28 08:50:33 +01:00
parent 4487ef2176
commit 1be6e06699
2 changed files with 191 additions and 140 deletions
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44
include/bw_iir1.h
View File

@ -317,6 +317,12 @@ static inline void bw_iir1_process_multi(
bw_iir1_process1(x[j][i], y[j] + i, s + j, b0, b1, a1);
}
#define BW_IIR1_COEFFS_COMMON \
const float t = bw_tanf(3.141592653589793f * prewarp_freq * bw_rcpf(sample_rate)); \
const float k = t * cutoff; \
const float d = bw_rcpf(k + prewarp_freq); \
*a1 = d * (k - prewarp_freq);
static inline void bw_iir1_coeffs_ap1(
float sample_rate,
float cutoff,
@ -324,10 +330,7 @@ static inline void bw_iir1_coeffs_ap1(
float * BW_RESTRICT b0,
float * BW_RESTRICT b1,
float * BW_RESTRICT a1) {
const float t = bw_tanf(3.141592653589793f * prewarp_freq * bw_rcpf(sample_rate));
const float k = t * cutoff;
const float d = bw_rcpf(k + prewarp_freq);
*a1 = d * (k - prewarp_freq);
BW_IIR1_COEFFS_COMMON
*b0 = *a1;
*b1 = 1.f;
}
@ -339,10 +342,7 @@ static inline void bw_iir1_coeffs_hp1(
float * BW_RESTRICT b0,
float * BW_RESTRICT b1,
float * BW_RESTRICT a1) {
const float t = bw_tanf(3.141592653589793f * prewarp_freq * bw_rcpf(sample_rate));
const float k = t * cutoff;
const float d = bw_rcpf(k + prewarp_freq);
*a1 = d * (k - prewarp_freq);
BW_IIR1_COEFFS_COMMON
*b0 = d * prewarp_freq;
*b1 = -*b0;
}
@ -355,11 +355,9 @@ static inline void bw_iir1_coeffs_hs1_lin(
float * BW_RESTRICT b0,
float * BW_RESTRICT b1,
float * BW_RESTRICT a1) {
const float t = bw_tanf(3.141592653589793f * prewarp_freq * bw_rcpf(sample_rate));
const float k = t * cutoff;
const float d = bw_rcpf(k + prewarp_freq);
cutoff = cutoff * bw_sqrtf(high_gain_lin);
BW_IIR1_COEFFS_COMMON
const float k2 = high_gain_lin * prewarp_freq;
*a1 = d * (k - prewarp_freq);
*b0 = d * (k + k2);
*b1 = d * (k - k2);
}
@ -382,10 +380,7 @@ static inline void bw_iir1_coeffs_lp1(
float * BW_RESTRICT b0,
float * BW_RESTRICT b1,
float * BW_RESTRICT a1) {
const float t = bw_tanf(3.141592653589793f * prewarp_freq * bw_rcpf(sample_rate));
const float k = t * cutoff;
const float d = bw_rcpf(k + prewarp_freq);
*a1 = d * (k - prewarp_freq);
BW_IIR1_COEFFS_COMMON
*b0 = d * k;
*b1 = *b0;
}
@ -398,11 +393,9 @@ static inline void bw_iir1_coeffs_ls1_lin(
float * BW_RESTRICT b0,
float * BW_RESTRICT b1,
float * BW_RESTRICT a1) {
const float t = bw_tanf(3.141592653589793f * prewarp_freq * bw_rcpf(sample_rate));
const float k = t * cutoff;
const float d = bw_rcpf(k + prewarp_freq);
cutoff = cutoff * bw_rcpf(bw_sqrtf(dc_gain_lin));
BW_IIR1_COEFFS_COMMON
const float k2 = dc_gain_lin * k;
*a1 = d * (k - prewarp_freq);
*b0 = d * (k2 + prewarp_freq);
*b1 = d * (k2 - prewarp_freq);
}
@ -427,16 +420,15 @@ static inline void bw_iir1_coeffs_mm1(
float * BW_RESTRICT b0,
float * BW_RESTRICT b1,
float * BW_RESTRICT a1) {
const float t = bw_tanf(3.141592653589793f * prewarp_freq * bw_rcpf(sample_rate));
const float k = t * cutoff;
const float d = bw_rcpf(k + prewarp_freq);
BW_IIR1_COEFFS_COMMON
const float k2 = coeff_x * prewarp_freq;
const float k3 = coeff_lp * k;
*a1 = d * (k - prewarp_freq);
*b0 = d * (k3 + k2);
*b1 = d * (k3 - k2);
}
#undef BW_IIR1_COEFFS_COMMON
#if !defined(BW_CXX_NO_EXTERN_C) && defined(__cplusplus)
}
#endif
@ -451,8 +443,6 @@ namespace Brickworks {
/*** Public C++ API ***/
//XXX
/*! api_cpp {{{
* ##### Brickworks::iir1Reset
* ```>>> */
@ -460,7 +450,7 @@ template<size_t N_CHANNELS>
void iir1Reset(
const float * x0,
float * y0,
float * BW_RESTRICT s0,
float * BW_RESTRICT s0,
float b0,
float b1,
float a1);

287
include/bw_iir2.h
View File

@ -296,7 +296,7 @@ static inline void bw_iir2_coeffs_peak_lin(
float cutoff,
float Q,
float prewarp_freq,
float dc_gain_lin,
float peak_gain_lin,
float * BW_RESTRICT b0,
float * BW_RESTRICT b1,
float * BW_RESTRICT b2,
@ -312,7 +312,7 @@ static inline void bw_iir2_coeffs_peak_dB(
float cutoff,
float Q,
float prewarp_freq,
float dc_gain_dB,
float peak_gain_dB,
float * BW_RESTRICT b0,
float * BW_RESTRICT b1,
float * BW_RESTRICT b2,
@ -328,7 +328,7 @@ static inline void bw_iir2_coeffs_peak_lin_bw(
float cutoff,
float bandwidth,
float prewarp_freq,
float dc_gain_lin,
float peak_gain_lin,
float * BW_RESTRICT b0,
float * BW_RESTRICT b1,
float * BW_RESTRICT b2,
@ -344,7 +344,7 @@ static inline void bw_iir2_coeffs_peak_dB_bw(
float cutoff,
float bandwidth,
float prewarp_freq,
float dc_gain_dB,
float peak_gain_dB,
float * BW_RESTRICT b0,
float * BW_RESTRICT b1,
float * BW_RESTRICT b2,
@ -387,8 +387,8 @@ static inline void bw_iir2_reset(
const float d = bw_rcpf(1.f + a1 + a2);
const float k = d * x_0;
*y_0 = k * (b0 + b1 + b2);
*s_0 = k * (b1 + b2 - b0 * (a1 + a2));
*s_1 = k * (b2 + b2 * a1 - a2 * (b0 + b1));
*s1_0 = k * (b1 + b2 - b0 * (a1 + a2));
*s2_0 = k * (b2 + b2 * a1 - a2 * (b0 + b1));
}
static inline void bw_iir2_reset_multi(
@ -402,8 +402,50 @@ static inline void bw_iir2_reset_multi(
float a1,
float a2,
size_t n_channels) {
for (size_t i = 0; i < n_channels; i++)
bw_iir2_reset(x_0[i], s1_0 + i, s2_0 + i, b0, b1, b2, a1, a2);
if (y_0 != BW_NULL) {
if (s1_0 != BW_NULL) {
if (s2_0 != BW_NULL)
for (size_t i = 0; i < n_channels; i++)
bw_iir2_reset(x_0[i], y_0 + i, s1_0 + i, s2_0 + i, b0, b1, b2, a1, a2);
else
for (size_t i = 0; i < n_channels; i++) {
float v_s2;
bw_iir2_reset(x_0[i], y_0 + i, s1_0 + i, &v_s2, b0, b1, b2, a1, a2);
}
} else {
if (s2_0 != BW_NULL)
for (size_t i = 0; i < n_channels; i++) {
float v_s1;
bw_iir2_reset(x_0[i], y_0 + i, &v_s1, s2_0 + i, b0, b1, b2, a1, a2);
}
else
for (size_t i = 0; i < n_channels; i++) {
float v_s1, v_s2;
bw_iir2_reset(x_0[i], y_0 + i, &v_s1, &v_s2, b0, b1, b2, a1, a2);
}
}
} else {
if (s1_0 != BW_NULL) {
if (s2_0 != BW_NULL)
for (size_t i = 0; i < n_channels; i++) {
float v_y;
bw_iir2_reset(x_0[i], &v_y, s1_0 + i, s2_0 + i, b0, b1, b2, a1, a2);
}
else
for (size_t i = 0; i < n_channels; i++) {
float v_y, v_s2;
bw_iir2_reset(x_0[i], &v_y, s1_0 + i, &v_s2, b0, b1, b2, a1, a2);
}
} else {
if (s2_0 != BW_NULL)
for (size_t i = 0; i < n_channels; i++) {
float v_y, v_s1;
bw_iir2_reset(x_0[i], &v_y, &v_s1, s2_0 + i, b0, b1, b2, a1, a2);
}
else
; // no need to do anything
}
}
}
static inline void bw_iir2_process1(
@ -453,6 +495,17 @@ static inline void bw_iir2_process_multi(
bw_iir2_process1(x[j][i], y[j] + i, s1 + j, s2 + j, b0, b1, b2, a1, a2);
}
#define BW_IIR2_COEFFS_COMMON \
const float t = bw_tanf(3.141592653589793f * prewarp_freq * bw_rcpf(sample_rate)); \
const float k1 = prewarp_freq * prewarp_freq; \
const float k2 = t * cutoff; \
const float k3 = k2 * k2; \
const float k4 = k2 * prewarp_freq; \
const float k5 = Q * (k1 + k3); \
const float d = bw_rcpf(k5 + k4); \
*a1 = d * (Q + Q) * (k3 - k1); \
*a2 = d * (k5 - k4);
static inline void bw_iir2_coeffs_ap2(
float sample_rate,
float cutoff,
@ -463,15 +516,7 @@ static inline void bw_iir2_coeffs_ap2(
float * BW_RESTRICT b2,
float * BW_RESTRICT a1,
float * BW_RESTRICT a2) {
const float t = bw_tanf(3.141592653589793f * prewarp_freq * bw_rcpf(sample_rate));
const float k1 = prewarp_freq * prewarp_freq;
const float k2 = t * cutoff;
const float k3 = k2 * k2;
const float k4 = k2 * prewarp_freq;
const float k5 = Q * (k1 + k3);
const float d = bw_rcpf(k5 + k4);
*a1 = (d + d) * Q * (k3 - k1);
*a2 = d * (k5 - k4);
BW_IIR2_COEFFS_COMMON
*b0 = *a2;
*b1 = *a1;
*b2 = 1.f;
@ -487,15 +532,7 @@ static inline void bw_iir2_coeffs_bp2(
float * BW_RESTRICT b2,
float * BW_RESTRICT a1,
float * BW_RESTRICT a2) {
const float t = bw_tanf(3.141592653589793f * prewarp_freq * bw_rcpf(sample_rate));
const float k1 = prewarp_freq * prewarp_freq;
const float k2 = t * cutoff;
const float k3 = k2 * k2;
const float k4 = k2 * prewarp_freq;
const float k5 = Q * (k1 + k3);
const float d = bw_rcpf(k5 + k4);
*a1 = (d + d) * Q * (k3 - k1);
*a2 = d * (k5 - k4);
BW_IIR2_COEFFS_COMMON
*b0 = Q * k4;
*b1 = 0.f;
*b2 = -*b0;
@ -511,15 +548,7 @@ static inline void bw_iir2_coeffs_hp2(
float * BW_RESTRICT b2,
float * BW_RESTRICT a1,
float * BW_RESTRICT a2) {
const float t = bw_tanf(3.141592653589793f * prewarp_freq * bw_rcpf(sample_rate));
const float k1 = prewarp_freq * prewarp_freq;
const float k2 = t * cutoff;
const float k3 = k2 * k2;
const float k4 = k2 * prewarp_freq;
const float k5 = Q * (k1 + k3);
const float d = bw_rcpf(k5 + k4);
*a1 = (d + d) * Q * (k3 - k1);
*a2 = d * (k5 - k4);
BW_IIR2_COEFFS_COMMON
*b0 = Q * k1;
*b1 = -(*b0 + *b0);
*b2 = *b0;
@ -536,7 +565,17 @@ static inline void bw_iir2_coeffs_hs2_lin(
float * BW_RESTRICT b2,
float * BW_RESTRICT a1,
float * BW_RESTRICT a2) {
//XXX
const float sg = bw_sqrtf(high_gain_lin);
const float ssg = bw_sqrtf(sg);
cutoff = cutoff * ssg;
BW_IIR2_COEFFS_COMMON
const float k6 = k1 * high_gain_lin;
const float k7 = k3 - k3 * sg;
const float k8 = Q * (k7 + k6);
const float k9 = k4 * sg;
*b0 = d * (k8 + k9);
*b1 = d * (Q + Q) * (k7 - k6);
*b2 = d * (k8 - k9);
}
static inline void bw_iir2_coeffs_hs2_dB(
@ -563,15 +602,7 @@ static inline void bw_iir2_coeffs_lp2(
float * BW_RESTRICT b2,
float * BW_RESTRICT a1,
float * BW_RESTRICT a2) {
const float t = bw_tanf(3.141592653589793f * prewarp_freq * bw_rcpf(sample_rate));
const float k1 = prewarp_freq * prewarp_freq;
const float k2 = t * cutoff;
const float k3 = k2 * k2;
const float k4 = k2 * prewarp_freq;
const float k5 = Q * (k1 + k3);
const float d = bw_rcpf(k5 + k4);
*a1 = (d + d) * Q * (k3 - k1);
*a2 = d * (k5 - k4);
BW_IIR2_COEFFS_COMMON
*b0 = Q * k3;
*b1 = *b0 + *b0;
*b2 = *b0;
@ -588,7 +619,16 @@ static inline void bw_iir2_coeffs_ls2_lin(
float * BW_RESTRICT b2,
float * BW_RESTRICT a1,
float * BW_RESTRICT a2) {
//XXX
const float sg = bw_sqrtf(dc_gain_lin);
const float issg = bw_rcpf(bw_sqrtf(sg));
cutoff = cutoff * issg;
BW_IIR2_COEFFS_COMMON
const float k6 = k3 * (dc_gain_lin - sg);
const float k7 = Q * (k6 + k1);
const float k8 = k4 * sg
*b0 = d * (k7 + k8);
*b1 = d * (Q + Q) * (k6 - k1);
*b2 = d * (k7 - k8);
}
static inline void bw_iir2_coeffs_ls2_dB(
@ -619,22 +659,14 @@ static inline void bw_iir2_coeffs_mm2(
float * BW_RESTRICT b2,
float * BW_RESTRICT a1,
float * BW_RESTRICT a2) {
const float t = bw_tanf(3.141592653589793f * prewarp_freq * bw_rcpf(sample_rate));
const float k1 = prewarp_freq * prewarp_freq;
const float k2 = t * cutoff;
const float k3 = k2 * k2;
const float k4 = k2 * prewarp_freq;
const float k5 = Q * (k1 + k3);
const float d = bw_rcpf(k5 + k4);
*a1 = (d + d) * Q * (k3 - k1);
*a2 = d * (k5 - k4);
const float k6 = k3 * (coeff_x + coeff_lp);
const float k7 = k4 * (coeff_x + coeff_bp);
const float k8 = k1 * (coeff_x + coeff_hp);
const float k9 = Q * (k6 + k8);
*b0 = d * (k9 + k7);
*b1 = d * (Q + Q) * (k6 - k8);
*b2 = d * (k9 - k7);
BW_IIR2_COEFFS_COMMON
const float k6 = k3 * (coeff_lp + coeff_x);
const float k7 = k1 * (coeff_hp + coeff_x);
const float k8 = k4 * (Q * coeff_bp + coeff_x);
const float k9 = Q * (k6 + k7);
*b0 = d * (k9 + k8);
*b1 = d * (Q + Q) * (k6 - k7);
*b2 = d * (k9 - k8);
}
static inline void bw_iir2_coeffs_notch(
@ -647,15 +679,7 @@ static inline void bw_iir2_coeffs_notch(
float * BW_RESTRICT b2,
float * BW_RESTRICT a1,
float * BW_RESTRICT a2) {
const float t = bw_tanf(3.141592653589793f * prewarp_freq * bw_rcpf(sample_rate));
const float k1 = prewarp_freq * prewarp_freq;
const float k2 = t * cutoff;
const float k3 = k2 * k2;
const float k4 = k2 * prewarp_freq;
const float k5 = Q * (k1 + k3);
const float d = bw_rcpf(k5 + k4);
*a1 = (d + d) * Q * (k3 - k1);
*a2 = d * (k5 - k4);
BW_IIR2_COEFFS_COMMON
*b0 = d * k5;
*b1 = *a1;
*b2 = *b0;
@ -666,13 +690,18 @@ static inline void bw_iir2_coeffs_peak_lin(
float cutoff,
float Q,
float prewarp_freq,
float dc_gain_lin,
float peak_gain_lin,
float * BW_RESTRICT b0,
float * BW_RESTRICT b1,
float * BW_RESTRICT b2,
float * BW_RESTRICT a1,
float * BW_RESTRICT a2) {
//XXX
BW_IIR2_COEFFS_COMMON
const float k6 = Q * (k1 + k3);
const float k7 = k4 * peak_gain_lin;
*b0 = d * (k6 + k7);
*b1 = *a1;
*b2 = d * (k6 - k7);
}
static inline void bw_iir2_coeffs_peak_dB(
@ -680,13 +709,13 @@ static inline void bw_iir2_coeffs_peak_dB(
float cutoff,
float Q,
float prewarp_freq,
float dc_gain_dB,
float peak_gain_dB,
float * BW_RESTRICT b0,
float * BW_RESTRICT b1,
float * BW_RESTRICT b2,
float * BW_RESTRICT a1,
float * BW_RESTRICT a2) {
bw_iir2_coeffs_peak_lin(sample_rate, cutoff, Q, prewarp_freq, bw_dB2linf(dc_gain_dB), b0, b1, b2, a1, a2);
bw_iir2_coeffs_peak_lin(sample_rate, cutoff, Q, prewarp_freq, bw_dB2linf(peak_gain_dB), b0, b1, b2, a1, a2);
}
static inline void bw_iir2_coeffs_peak_lin_bw(
@ -694,13 +723,15 @@ static inline void bw_iir2_coeffs_peak_lin_bw(
float cutoff,
float bandwidth,
float prewarp_freq,
float dc_gain_lin,
float peak_gain_lin,
float * BW_RESTRICT b0,
float * BW_RESTRICT b1,
float * BW_RESTRICT b2,
float * BW_RESTRICT a1,
float * BW_RESTRICT a2) {
//XXX
const float k6 = bw_pow2f(bandwidth);
const float Q = bw_sqrtf(k6 * peak_gain_lin) * bw_rcpf(k6 - 1.f);
bw_iir2_coeffs_peak_lin(sample_rate, cutoff, Q, prewarp_freq, peak_gain_lin, b0, b1, b2, a1, a2);
}
static inline void bw_iir2_coeffs_peak_dB_bw(
@ -708,15 +739,17 @@ static inline void bw_iir2_coeffs_peak_dB_bw(
float cutoff,
float bandwidth,
float prewarp_freq,
float dc_gain_dB,
float peak_gain_dB,
float * BW_RESTRICT b0,
float * BW_RESTRICT b1,
float * BW_RESTRICT b2,
float * BW_RESTRICT a1,
float * BW_RESTRICT a2) {
bw_iir2_coeffs_peak_lin_bw(sample_rate, cutoff, bandwidth, prewarp_freq, bw_dB2linf(dc_gain_dB), b0, b1, b2, a1, a2);
bw_iir2_coeffs_peak_lin_bw(sample_rate, cutoff, bandwidth, prewarp_freq, bw_dB2linf(peak_gain_dB), b0, b1, b2, a1, a2);
}
#undef BW_IIR2_COEFFS_COMMON
#if !defined(BW_CXX_NO_EXTERN_C) && defined(__cplusplus)
}
#endif
@ -736,41 +769,55 @@ namespace Brickworks {
* ```>>> */
template<size_t N_CHANNELS>
void iir2Reset(
const float * BW_RESTRICT x0,
float * BW_RESTRICT const * BW_RESTRICT s0,
float b0,
float b1,
float a1);
const float * x0,
float * y0,
float * BW_RESTRICT s10,
float * BW_RESTRICT s20,
float b0,
float b1,
float b2,
float a1,
float a2);
# ifndef BW_CXX_NO_ARRAY
template<size_t N_CHANNELS>
void iir2Reset(
std::array<float, N_CHANNELS> x0,
std::array<float * BW_RESTRICT, N_CHANNELS> s0,
std::array<float, N_CHANNELS> * BW_RESTRICT y0,
std::array<float, N_CHANNELS> * BW_RESTRICT s10,
std::array<float, N_CHANNELS> * BW_RESTRICT s20,
float b0,
float b1,
float a1);
float b2,
float a1,
float a2);
# endif
template<size_t N_CHANNELS>
void iir2Process(
const float * const * x,
float * const * y,
float * BW_RESTRICT const * BW_RESTRICT s,
float b0,
float b1,
float a1,
size_t nSamples);
const float * const * x,
float * const * y,
float * BW_RESTRICT s1,
float * BW_RESTRICT s2,
float b0,
float b1,
float b2,
float a1,
float a2,
size_t nSamples);
# ifndef BW_CXX_NO_ARRAY
template<size_t N_CHANNELS>
void iir2Process(
std::array<const float *, N_CHANNELS> x,
std::array<float *, N_CHANNELS> y,
std::array<float * BW_RESTRICT, N_CHANNELS> s,
std::array<float, N_CHANNELS> * BW_RESTRICT s1,
std::array<float, N_CHANNELS> * BW_RESTRICT s2,
float b0,
float b1,
float b2,
float a1,
float a2,
size_t nSamples);
# endif
/*! <<<```
@ -783,36 +830,47 @@ void iir2Process(
template<size_t N_CHANNELS>
inline void iir2Reset(
const float * BW_RESTRICT x0,
float * BW_RESTRICT const * BW_RESTRICT s0,
float b0,
float b1,
float a1) {
bw_iir2_reset_multi(x0, s0, b0, b1, a1, N_CHANNELS);
const float * x0,
float * y0,
float * BW_RESTRICT s10,
float * BW_RESTRICT s20,
float b0,
float b1,
float b2,
float a1,
float a2) {
bw_iir2_reset_multi(x0, y0, s10, s20, b0, b1, b2, a1, a2, N_CHANNELS);
}
# ifndef BW_CXX_NO_ARRAY
template<size_t N_CHANNELS>
inline void iir2Reset(
std::array<float, N_CHANNELS> x0,
std::array<float * BW_RESTRICT, N_CHANNELS> s0,
std::array<float, N_CHANNELS> * BW_RESTRICT y0,
std::array<float, N_CHANNELS> * BW_RESTRICT s10,
std::array<float, N_CHANNELS> * BW_RESTRICT s20,
float b0,
float b1,
float a1) {
iir2Reset<N_CHANNELS>(x0.data(), s0.data(), b0, b1, a1);
float b2,
float a1,
float a2) {
iir2Reset<N_CHANNELS>(x0.data(), y0 != nullptr ? y0.data() : nullptr, s10 != nullptr ? s10.data() : nullptr, s20 != nullptr ? s20.data() : nullptr, b0, b1, b2, a1, a2);
}
# endif
template<size_t N_CHANNELS>
inline void iir2Process(
const float * const * x,
float * const * y,
float * BW_RESTRICT const * BW_RESTRICT s,
float b0,
float b1,
float a1,
size_t nSamples) {
bw_iir2_process_multi(x, y, s, b0, b1, a1, N_CHANNELS, nSamples);
const float * const * x,
float * const * y,
float * BW_RESTRICT s1,
float * BW_RESTRICT s2,
float b0,
float b1,
float b2,
float a1,
float a2,
size_t nSamples) {
bw_iir2_process_multi(x, y, s1, s2, b0, b1, b2, a1, a2, N_CHANNELS, nSamples);
}
# ifndef BW_CXX_NO_ARRAY
@ -820,12 +878,15 @@ template<size_t N_CHANNELS>
inline void iir2Process(
std::array<const float *, N_CHANNELS> x,
std::array<float *, N_CHANNELS> y,
std::array<float * BW_RESTRICT, N_CHANNELS> s,
std::array<float, N_CHANNELS> * BW_RESTRICT s1,
std::array<float, N_CHANNELS> * BW_RESTRICT s2,
float b0,
float b1,
float b2,
float a1,
float a2,
size_t nSamples) {
iir2Process<N_CHANNELS>(x.data(), y.data(), s.data(), b0, b1, a1, nSamples);
iir2Process<N_CHANNELS>(x.data(), y.data(), s1.data(), s2.data(), b0, b1, b2, a1, a2, nSamples);
}
# endif