不韋 呂
STM32F446 内蔵の DAC から出力する際に，補間フィルタを利用し，標本化周波数を入力の際の４倍の標本化周波数で出力するためのライブラリ．このライブラリを登録した際のプログラム： Demo_DSP_ADDA_Multirate. Library for outputting from built-in DAC in STM32F446 using interpolation filter at sampling frequency of 4 times in case of input.
Dependencies: Array_Matrix DSP_ADDA
Dependents: Demo_DSP_ADDA_Multirate DSP_AD_DA_Multirate DSP_GraphicEqualizerB DSP_VariableLHpfB ... more
Diff: MultirateLiPhCoefs.hpp
- Revision:
- 12:f7bfe38c93ab
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MultirateLiPhCoefs.hpp Wed Dec 22 08:01:24 2021 +0000
@@ -0,0 +1,38 @@
+//-------------------------------------------------------------------
+// デフォルトの補間用フィルタの係数
+// この係数は，入力の標本化周波数を 10 kHz，
+// 出力の標本化周波数を 40 kHz として設計した
+//
+// 2021/12/22, Copyright (c) 2021 MIKAMI, Naoki
+//-------------------------------------------------------------------
+
+#include "MultirateLiPh.hpp"
+
+namespace Mikami
+{
+ // 使用窓関数 Kaiser 窓
+ // 標本化周波数 (kHz) 40.000000
+ // 次数 72
+ // 種類 LPF
+ // 遮断周波数 (kHz) 5.000000
+ // 減衰量 (dB) 40.00
+ const int MultirateLiPh::ORDER_ = 72;
+ const float MultirateLiPh::HK1_[] = {
+ 4.431256E-03f, -8.146596E-03f, 1.341366E-02f, -2.077330E-02f,
+ 3.116614E-02f, -4.650688E-02f, 7.151836E-02f, -1.218529E-01f,
+ 2.971602E-01f, 8.993316E-01f, -1.751857E-01f, 9.144896E-02f,
+ -5.727932E-02f, 3.802786E-02f, -2.550498E-02f, 1.678651E-02f,
+ -1.055827E-02f, 6.120216E-03f};
+ const float MultirateLiPh::HK2_[] = {
+ 7.405152E-03f, -1.315348E-02f, 2.125564E-02f, -3.257789E-02f,
+ 4.868468E-02f, -7.290120E-02f, 1.139337E-01f, -2.039652E-01f,
+ 6.338376E-01f, 6.338376E-01f, -2.039652E-01f, 1.139337E-01f,
+ -7.290120E-02f, 4.868468E-02f, -3.257789E-02f, 2.125564E-02f,
+ -1.315348E-02f, 7.405152E-03f};
+ const float MultirateLiPh::HK3_[] = {
+ 6.120216E-03f, -1.055827E-02f, 1.678651E-02f, -2.550498E-02f,
+ 3.802786E-02f, -5.727932E-02f, 9.144896E-02f, -1.751857E-01f,
+ 8.993316E-01f, 2.971602E-01f, -1.218529E-01f, 7.151836E-02f,
+ -4.650688E-02f, 3.116614E-02f, -2.077330E-02f, 1.341366E-02f,
+ -8.146596E-03f, 4.431256E-03f};
+}
\ No newline at end of file