eq4
Four-band equalizer. The transition frequencies are 100, 500, 2000, and 6000 Hz. Lower quality version. The low band is ommitted.
Inlets
frac32buffer input
Outlets
frac32buffer output
Parameters
int32 lowmid
int32 mid
int32 highmid
int32 high
Declaration
q31_t biquadStateBand2Q31[4 * 2];
q31_t biquadStateBand3Q31[4 * 2];
q31_t biquadStateBand4Q31[4 * 2];
q31_t biquadStateBand5Q31[4 * 2];
arm_biquad_casd_df1_inst_q31 S2;
arm_biquad_casd_df1_inst_q31 S3;
arm_biquad_casd_df1_inst_q31 S4;
arm_biquad_casd_df1_inst_q31 S5;
static const int NUMSTAGES = 2;
Init
arm_biquad_cascade_df1_init_q31(&S2, NUMSTAGES,
(q31_t *)&eq5coefs[190 * 1 + 10 * 9],
&biquadStateBand2Q31[0], 2);
arm_biquad_cascade_df1_init_q31(&S3, NUMSTAGES,
(q31_t *)&eq5coefs[190 * 2 + 10 * 9],
&biquadStateBand3Q31[0], 2);
arm_biquad_cascade_df1_init_q31(&S4, NUMSTAGES,
(q31_t *)&eq5coefs[190 * 3 + 10 * 9],
&biquadStateBand4Q31[0], 2);
arm_biquad_cascade_df1_init_q31(&S5, NUMSTAGES,
(q31_t *)&eq5coefs[190 * 4 + 10 * 9],
&biquadStateBand5Q31[0], 2);
Control Rate
S2.pCoeffs = (q31_t *)&eq5coefs[190 * 1 + 10 * (param_lowmid + 9)];
S3.pCoeffs = (q31_t *)&eq5coefs[190 * 2 + 10 * (param_mid + 9)];
S4.pCoeffs = (q31_t *)&eq5coefs[190 * 3 + 10 * (param_highmid + 9)];
S5.pCoeffs = (q31_t *)&eq5coefs[190 * 4 + 10 * (param_high + 9)];
arm_biquad_cascade_df1_q31(&S2, (q31_t *)inlet_in, (q31_t *)outlet_out,
BUFSIZE);
arm_biquad_cascade_df1_q31(&S3, (q31_t *)outlet_out, (q31_t *)outlet_out,
BUFSIZE);
arm_biquad_cascade_df1_q31(&S4, (q31_t *)outlet_out, (q31_t *)outlet_out,
BUFSIZE);
arm_biquad_cascade_df1_q31(&S5, (q31_t *)outlet_out, (q31_t *)outlet_out,
BUFSIZE);