1 /* 2 * Copyright (c) 2018, Intel Corporation 3 * All rights reserved. 4 * 5 * Author: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com> 6 * Sathish Kuttan <sathish.k.kuttan@intel.com> 7 * 8 * SPDX-License-Identifier: Apache-2.0 9 */ 10 11 /* PDM decimation FIR filters */ 12 13 #include <zephyr.h> 14 15 #include "pdm_decim_fir.h" 16 17 extern struct pdm_decim pdm_decim_int32_02_4375_5100_010_095; 18 extern struct pdm_decim pdm_decim_int32_02_4288_5100_010_095; 19 extern struct pdm_decim pdm_decim_int32_03_4375_5100_010_095; 20 extern struct pdm_decim pdm_decim_int32_03_3850_5100_010_095; 21 extern struct pdm_decim pdm_decim_int32_04_4375_5100_010_095; 22 extern struct pdm_decim pdm_decim_int32_05_4331_5100_010_095; 23 extern struct pdm_decim pdm_decim_int32_06_4156_5100_010_095; 24 extern struct pdm_decim pdm_decim_int32_08_4156_5380_010_090; 25 26 /* Note: Higher spec filter must be before lower spec filter 27 * if there are multiple filters for a decimation factor. The naming 28 * scheme of coefficients set is: 29 * <type>_<decim factor>_<rel passband>_<rel stopband>_<ripple>_<attenuation> 30 */ 31 static struct pdm_decim *fir_list[DMIC_FIR_LIST_LENGTH] = { 32 &pdm_decim_int32_02_4375_5100_010_095, 33 &pdm_decim_int32_02_4288_5100_010_095, 34 &pdm_decim_int32_03_4375_5100_010_095, 35 &pdm_decim_int32_03_3850_5100_010_095, 36 &pdm_decim_int32_04_4375_5100_010_095, 37 &pdm_decim_int32_05_4331_5100_010_095, 38 &pdm_decim_int32_06_4156_5100_010_095, 39 &pdm_decim_int32_08_4156_5380_010_090, 40 }; 41 pdm_decim_get_fir_list(void)42struct pdm_decim **pdm_decim_get_fir_list(void) 43 { 44 return fir_list; 45 } 46
