不韋 呂 / F746_AcousticEffector_MIC

Audio singal input and output example for DISCO-F746. Input: MEMS mic, Output: CN10 OUT, Acoustic effect: echo and frequency shift. DISCO-F746 によるオーディオ信号入出力．入力：MEMS マイク，出力：CN10 OUT，音響効果：エコー，周波数変換．

Dependencies:   F746_GUI F746_SAI_IO

Diff: MyAcousticEffector_MIC/Biquad.hpp

Revision:
10:56f2f01df983
Parent:
8:9378fea59845
--- a/MyAcousticEffector_MIC/Biquad.hpp	Fri Mar 17 01:26:25 2017 +0000
+++ b/MyAcousticEffector_MIC/Biquad.hpp	Mon Apr 10 13:44:13 2017 +0000
@@ -9,7 +9,7 @@
 //          y[n] :  output signal
 //          b0 = 1
 //
-// 2016/11/08, Copyright (c) 2016 MIKAMI, Naoki
+// 2017/03/26, Copyright (c) 2017 MIKAMI, Naoki
 //--------------------------------------------------------------
 
 #ifndef IIR_BIQUAD_HPP
@@ -25,9 +25,7 @@
     public:
         struct Coefs { float a1, a2, b1, b2; };
 
-        Biquad() {}     // Default constructore
-
-        Biquad(const Coefs ck)
+        Biquad(const Coefs ck = (Coefs){0, 0, 0, 0})
         {
             SetCoefficients(ck);
             Clear();