不韋 呂
Output the audio signal (*.bin) with filtering by IIR filter in the SD card using onboard CODEC. For *.wav file, F746_SD_WavPlayer and F746_SD_GraphicEqualiser are published on mbed. SD カードのオーディオ信号 (*.bin) を遮断周波数可変の IIR フィルタを通して，ボードに搭載されているCODEC で出力する．*.wav 形式のファイル用には，F746_SD_WavPlayer と F746_SD_GraphicEqualiser を mbed で公開している．
Dependencies: BSP_DISCO_F746NG_patch_fixed F746_GUI LCD_DISCO_F746NG SDFileSystem_Warning_Fixed TS_DISCO_F746NG mbed
Diff: MyClasses_Functions/DesignerDrawer.cpp
- Revision:
- 0:6748e3332e85
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MyClasses_Functions/DesignerDrawer.cpp Fri Apr 08 13:11:53 2016 +0000
@@ -0,0 +1,146 @@
+//------------------------------------------------------------------------------
+// IIR フィルタを双一次 z 変換で設計し，その周波数特性を描画するためのクラス
+//
+// 2016/04/08, Copyright (c) 2016 MIKAMI, Naoki
+//------------------------------------------------------------------------------
+
+#include "DesignerDrawer.hpp"
+
+namespace Mikami
+{
+ // Constructor
+ DesignerDrawer::DesignerDrawer(uint16_t x0, uint16_t y0,
+ uint16_t db10, int fs, int order,
+ float fc, uint16_t fL, uint16_t fH,
+ BilinearDesign::Type lpHp)
+ : lcd_(GuiBase::GetLcdPtr()), ts_(GuiBase::GetTsPtr()),
+ X0_(x0), Y0_(y0), DB10_(db10), ORDER_(order),
+ CURSOR_Y0_(y0+1-db10*6), CURSOR_LENGTH_(db10*6-1),
+ LOWER_F_(fL), HIGHER_F_(fH),
+ CURSOR_COLOR_(0xFFE000D0), CURSOR_TOUCHED_COLOR_(0xFFFF80FF)
+ {
+ drawerObj_ = new BiquadFrqRespDrawer(
+ FrqRespDrawer::Params(x0, 100.0f, 8000.0f, 150,
+ y0, -60, 0, db10, fs));
+
+ // 双一次 z 変換による IIR フィルタの設計
+ designObj_ = new BilinearDesign(order, fs);
+ coefs_ = new BilinearDesign::Coefs[ORDER_/2];
+ ck_ = (Biquad::Coefs *)coefs_;
+
+ fC_ = fc; // 最初に与える遮断周波数
+ designObj_->Execute(fC_, lpHp, coefs_, g0_);
+ drawerObj_->SetParams(ORDER_, g0_, ck_);
+ lblFrq_ = new NumericLabel<int>(110, 30);
+
+ // 周波数特性の描画
+ DrawResponse();
+
+ tp_ = new TouchPanelDetectorX(
+ drawerObj_->X(LOWER_F_), drawerObj_->X(HIGHER_F_),
+ CURSOR_Y0_, y0);
+ lp_ = lpHp;
+ cursorRedraw_ = false;
+ }
+
+ DesignerDrawer::~DesignerDrawer()
+ {
+ delete tp_;
+ delete lblFrq_;
+ delete coefs_;
+ delete designObj_;
+ delete drawerObj_;
+ }
+
+ // フィルタの再設計と周波数特性の再描画
+ bool DesignerDrawer::ReDesignAndDraw(Biquad::Coefs *ck, float &g0,
+ BilinearDesign::Type lpHp)
+ {
+ bool changed = (lpHp != lp_) ? true : false;
+ bool tch = tp_->IsTouched(cursorX_, cursorX_);
+ if (tch || changed)
+ {
+ int newFc = Frq10(drawerObj_->PosToFrq(cursorX_));
+ newFc = (newFc > HIGHER_F_) ? HIGHER_F_ : newFc;
+ if ((abs(newFc - fC_) >= 10) || changed)
+ {
+ fC_ = newFc;
+ lblFrq_->Draw("Cutoff frequency = %4d Hz", newFc);
+ designObj_->Execute(newFc, lpHp, coefs_, g0_);
+ GetCoefficients(ck, g0);
+
+ drawerObj_->SetParams(ORDER_, g0_, ck_);
+ drawerObj_->Erase();
+ drawerObj_->DrawAxis(); // 目盛線の描画
+ drawerObj_->DrawGraph(); // 周波数特性のグラフのカーブを描画する
+
+ if (tch) // カーソルの移動
+ {
+ lcd_->SetTextColor(CURSOR_TOUCHED_COLOR_);
+ lcd_->DrawVLine(cursorX_, CURSOR_Y0_, CURSOR_LENGTH_);
+ }
+ cursorRedraw_ = true;
+ oldCursorX_ = cursorX_;
+ lp_ = lpHp;
+ return true;
+ }
+ }
+
+ if (!tch && cursorRedraw_) // カーソルを元の色に戻す
+ {
+ lcd_->SetTextColor(CURSOR_COLOR_);
+ lcd_->DrawVLine(oldCursorX_, CURSOR_Y0_, CURSOR_LENGTH_);
+ cursorRedraw_ = false;
+ }
+ return false;
+ }
+
+ // 周波数特性の描画
+ void DesignerDrawer::DrawResponse()
+ {
+ lblFrq_->Draw("Cutoff frequency = %4d Hz", fC_);
+ DrawAxisNum(); // 目盛値の描画
+ drawerObj_->DrawAxis(); // 目盛線の描画
+ drawerObj_->DrawGraph(); // 周波数特性のカーブの描画
+
+ cursorX_ = drawerObj_->X(fC_);
+ lcd_->SetTextColor(CURSOR_COLOR_);
+ lcd_->DrawVLine(cursorX_, CURSOR_Y0_, CURSOR_LENGTH_);
+ }
+
+ // フィルタ係数の取得
+ void DesignerDrawer::GetCoefficients(Biquad::Coefs *c, float &g0)
+ {
+ for (int k=0; k<ORDER_/2; k++) c[k] = ck_[k];
+ g0 = g0_;
+ }
+
+ // 周波数を 10, 20, 50, 100 Hz の倍数にする
+ int DesignerDrawer::Frq10(float f)
+ {
+ if (f < 1000)
+ return ((int)(f/10.0f + 0.5f))*10;
+ if (f < 2000)
+ return ((int)(f/20.0f + 0.5f))*20;
+ if (f < 3000)
+ return ((int)(f/50.0f + 0.5f))*50;
+ else
+ return ((int)(f/100.0f + 0.5f))*100;
+ }
+
+ // 周波数特性の目盛線の描画
+ void DesignerDrawer::DrawAxisNum()
+ {
+ const int16_t OFS = 6;
+ drawerObj_->DrawCharX(100, OFS, "0.1");
+ drawerObj_->DrawCharX(300, OFS, "0.3");
+ drawerObj_->DrawCharX(1000, OFS, "1.0");
+ drawerObj_->DrawCharX(3000, OFS, "3.0");
+ drawerObj_->DrawCharX(8000, OFS, "8.0");
+
+ Label l_frq(drawerObj_->X(900), Y0_+20, "Frequency [kHz]",
+ Label::CENTER);
+ drawerObj_->DrawNumericY(-24, -6, 4, 20, "%3d"); // 縦軸の目盛は 20 dB 間隔
+ Label l_dB(X0_-24, Y0_-DB10_*6-20, "[dB]");
+ }
+}