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
MultirateLiPhCoefs.hpp
- Committer:
- MikamiUitOpen
- Date:
- 2021-12-22
- Revision:
- 12:f7bfe38c93ab
File content as of revision 12:f7bfe38c93ab:
//------------------------------------------------------------------- // 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}; }