Output the audio signal with filtering by IIR filter in the Quad-SPI flash memory using onboard CODEC. QSPI フラッシュメモリのオーディオデータ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 で出力するプログラム.
Dependencies: BSP_DISCO_F746NG_patch_fixed F746_GUI LCD_DISCO_F746NG QSPI_DISCO_F746NG TS_DISCO_F746NG mbed
MyClasses_Functions/DesignerDrawer.cpp
- Committer:
- MikamiUitOpen
- Date:
- 2016-04-07
- Revision:
- 1:a1be09c2533a
- Parent:
- 0:2eb96a7cf9b9
File content as of revision 1:a1be09c2533a:
//------------------------------------------------------------------------------ // 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 // // 2016/03/31, Copyright (c) 2016 MIKAMI, Naoki //------------------------------------------------------------------------------ #include "DesignerDrawer.hpp" namespace Mikami { // Constructor DesignerDrawer::DesignerDrawer(uint16_t x0, uint16_t y0, uint16_t db10, uint16_t fs, int order, float fc, uint16_t fL, uint16_t fH, BilinearDesign::Type lpHp) : lcd_(GuiBase::GetLcdPtr()), ts_(GuiBase::GetTsPtr()), ORDER_(order), CURSOR_Y0_(y0-db10*6), CURSOR_LENGTH_(db10*6), LOWER_F_(fL), HIGHER_F_(fH), CURSOR_COLOR_(0xFF00D0D0), CURSOR_TOUCHED_COLOR_(0xFF00FFFF) { drawerObj_ = new BiquadFrqRespDrawer( FrqRespDrawer::Params(x0, 100.0f, 8000.0f, 150, y0, -60, 0, db10, fs)); 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]"); // 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_); // 周波数特性の描画 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_); tp_ = new TouchPanelDetectorX( drawerObj_->X(LOWER_F_), drawerObj_->X(HIGHER_F_), CURSOR_Y0_, y0); lblFrq_ = new NumericLabel<int>(110, 30, "Cutoff frequency = %4d Hz", (int)fC_); lp_ = lpHp; cursorRedraw_ = false; } // 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) { 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; } // 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; } }