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.cpp
- Revision:
- 2:aa092bbc8877
- Parent:
- 0:79c0b1e2fd10
- Child:
- 3:59af3dfa0595
--- a/MultirateLiPhCoefs.cpp Mon May 25 12:49:15 2020 +0000
+++ b/MultirateLiPhCoefs.cpp Tue May 26 12:21:41 2020 +0000
@@ -1,9 +1,13 @@
//-------------------------------------------------------------------
-// デフォルトの補間用フィルタの係数
+// 補間用フィルタのデフォルトの係数
// ORDER_, HK1_, HK2_, HK3_ が他の箇所で定義されていない場合は
// このファイルの値が使われる
+// デフォルト以外の係数を使う場合，次数は以下の条件を満足すること
+// 偶数（係数の個数は奇数）
+// FACTOR_ の整数倍，または FACTOR_ の整数倍 - 2
+// ただし，このライブラリの場合 FACTOR_ = 4
//
-// 2020/05/25, Copyright (c) 2020 MIKAMI, Naoki
+// 2020/05/26, Copyright (c) 2020 MIKAMI, Naoki
//-------------------------------------------------------------------
#include "MultirateLiPh.hpp"
@@ -14,26 +18,26 @@
//
// 使用窓関数 Kaiser 窓
// 標本化周波数 (kHz) 40.000000
-// 次数 72
+// 次数 70
// 種類 LPF
// 遮断周波数 (kHz) 5.000000
-// 減衰量 (dB) 40.00
-MBED_WEAK const int MultirateLiPh::ORDER_ = 72;
+// 減衰量 (dB) 40.00
+MBED_WEAK const int MultirateLiPh::ORDER_ = 70;
MBED_WEAK 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};
-MBED_WEAK 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};
-MBED_WEAK 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
+ 3.806160E-03f, -7.410556E-03f, 1.260559E-02f, -1.994242E-02f,
+ 3.036776E-02f, -4.579744E-02f, 7.095016E-02f, -1.214690E-01f,
+ 2.969901E-01f, 8.992744E-01f, -1.749060E-01f, 9.096828E-02f,
+-5.663444E-02f, 3.726704E-02f, -2.468324E-02f, 1.596038E-02f,
+-9.780624E-03f, 5.435560E-03f};
+MBED_WEAK const float MultirateLiPh::HK2_[] = {
+ 6.477720E-03f, -1.208128E-02f, 2.009782E-02f, -3.140681E-02f,
+ 4.757964E-02f, -7.194132E-02f, 1.131902E-01f, -2.034948E-01f,
+ 6.336764E-01f, 6.336764E-01f, -2.034948E-01f, 1.131902E-01f,
+-7.194132E-02f, 4.757964E-02f, -3.140681E-02f, 2.009782E-02f,
+-1.208128E-02f, 6.477720E-03f};
+MBED_WEAK const float MultirateLiPh::HK3_[] = {
+ 5.435560E-03f, -9.780624E-03f, 1.596038E-02f, -2.468324E-02f,
+ 3.726704E-02f, -5.663444E-02f, 9.096828E-02f, -1.749060E-01f,
+ 8.992744E-01f, 2.969901E-01f, -1.214690E-01f, 7.095016E-02f,
+-4.579744E-02f, 3.036776E-02f, -1.994242E-02f, 1.260559E-02f,
+-7.410556E-03f, 3.806160E-03f};
\ No newline at end of file