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:
- 8:356d0c5f97c3
- Parent:
- 6:202a7610f937
- Child:
- 9:9f391b2d51be
--- a/MultirateLiPhCoefs.cpp Sat Nov 07 02:17:52 2020 +0000 +++ b/MultirateLiPhCoefs.cpp Sat Nov 28 02:27:00 2020 +0000 @@ -1,9 +1,9 @@ //------------------------------------------------------------------- // デフォルトの補間用フィルタの係数 -// このの係数は,入力の標本化周波数を 10 kHz,出力の標本化周波数を -// 40 kHz として設計したもの +// 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 // -// 2020/09/12, Copyright (c) 2020 MIKAMI, Naoki +// 2020/11/28, Copyright (c) 2020 MIKAMI, Naoki //------------------------------------------------------------------- #include "MultirateLiPh.hpp" @@ -12,27 +12,27 @@ { // 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 - const int MultirateLiPh::ORDER_ = 72; + // 減衰量 (dB) 40.00 + const int MultirateLiPh::ORDER_ = 70; 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}; + 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}; 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}; + 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}; 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}; + 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