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

MultirateLiPhCoefs.cpp

Committer:
MikamiUitOpen
Date:
2020-11-28
Revision:
8:356d0c5f97c3
Parent:
6:202a7610f937
Child:
9:9f391b2d51be

File content as of revision 8:356d0c5f97c3:

//-------------------------------------------------------------------
// 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
//
//  2020/11/28, Copyright (c) 2020 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                    70
    // 種類         LPF
    // 遮断周波数 (kHz)         5.000000
    // 減衰量 (dB)             40.00 
    const int MultirateLiPh::ORDER_ = 70;
    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};
    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};
    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};
}