不韋 呂 / DSP_MultirateLinearphase

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:
3:59af3dfa0595
Parent:
2:aa092bbc8877
Child:
4:c233f2db4652
--- a/MultirateLiPhCoefs.cpp	Tue May 26 12:21:41 2020 +0000
+++ b/MultirateLiPhCoefs.cpp	Tue Jun 16 09:48:54 2020 +0000
@@ -1,13 +1,7 @@
 //-------------------------------------------------------------------
-//  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
+// デフォルトの補間用フィルタの係数
 //
-//  2020/05/26, Copyright (c) 2020 MIKAMI, Naoki
+//  2020/06/16, Copyright (c) 2020 MIKAMI, Naoki
 //-------------------------------------------------------------------
 
 #include "MultirateLiPh.hpp"
@@ -18,26 +12,26 @@
 //
 // 使用窓関数   Kaiser 窓
 // 標本化周波数 (kHz)      40.000000
-// 次数                    70
+// 次数                    72
 // 種類         LPF
 // 遮断周波数 (kHz)         5.000000
-// 減衰量 (dB)             40.00 
-MBED_WEAK const int MultirateLiPh::ORDER_ = 70; 
-MBED_WEAK const float MultirateLiPh::HK1_[] = {
- 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
+// 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