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Dependencies: BSP_DISCO_F746NG F746_GUI F746_SAI_IO FrequencyResponseDrawer LCD_DISCO_F746NG SDFileSystem_Warning_Fixed TS_DISCO_F746NG mbed
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F746_SD_GraphicEqualizer
by 
不韋 呂
Diff: MyClasses_Functions/GrEqualizerFrqResp.hpp
- Revision:
- 8:12aa05f3cc24
- Parent:
- 0:e953eb392151
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MyClasses_Functions/GrEqualizerFrqResp.hpp Mon May 09 08:54:09 2016 +0000
@@ -0,0 +1,52 @@
+//-----------------------------------------------------------
+// グラフィックイコライザで使う IIR フィルタの周波数応答
+// Frequency response for graphic equalizer
+//
+// 2016/04/27, Copyright (c) 2016 MIKAMI, Naoki
+//-----------------------------------------------------------
+
+#ifndef GRAPHIC_EQUALIZER_FREQUENCY_RESPONSE_HPP
+#define GRAPHIC_EQUALIZER_FREQUENCY_RESPONSE_HPP
+
+#include "FrequancyResponseBase.hpp"
+#include "BiquadGrEq.hpp"
+
+namespace Mikami
+{
+ class GrEqualizerFrqResp : public FrequencyResponse
+ {
+ public:
+ GrEqualizerFrqResp(int stages) : STAGES_(stages)
+ { ck_ = new BiquadGrEq::Coefs[stages]; }
+
+ ~GrEqualizerFrqResp()
+ { delete[] ck_; }
+
+ // フィルタの係数設定
+ void SetParams(BiquadGrEq::Coefs ck[])
+ { for (int n=0; n<STAGES_; n++) ck_[n] = ck[n]; }
+
+ void SetParam(BiquadGrEq::Coefs ck, int n)
+ { ck_[n] = ck; }
+
+ // 周波数応答の絶対値を返す関数, 引数: z^(-1)
+ virtual float AbsH_z(Complex u)
+ {
+ Complex h = 1;
+ for (int k=0; k<STAGES_; k++)
+ h = h*(ck_[k].b0 + (ck_[k].b1 + ck_[k].b2*u)*u)
+ /((1.0f - (ck_[k].a1 + ck_[k].a2*u)*u));
+ return abs(h);
+ }
+
+ private:
+ const int STAGES_;
+ float g0_;
+ BiquadGrEq::Coefs *ck_;
+
+ // disallow copy constructor and assignment operator
+ GrEqualizerFrqResp(const GrEqualizerFrqResp&);
+ GrEqualizerFrqResp& operator=(const GrEqualizerFrqResp&);
+ };
+}
+#endif // GRAPHIC_EQUALIZER_FREQUENCY_RESPONSE_HPP