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
diff -r 91190380ca3c -r f7bfe38c93ab MultirateLiPhCoefs.hpp --- /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