不韋 呂
Realtime spectrogram for DISCO-F746NG. On-board MEMS microphone is used for input sound signal. リアルタイムスペクトログラム．入力：MEMSマイク
Dependencies: F746_GUI F746_SAI_IO UIT_FFT_Real
Diff: MySpectrogram/FFT_Analysis.cpp
- Revision:
- 3:6a2c8ff46f73
- Parent:
- 2:1f092ac020e1
- Child:
- 6:b3885567877c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MySpectrogram/FFT_Analysis.cpp Mon Aug 15 06:51:01 2016 +0000
@@ -0,0 +1,23 @@
+//-------------------------------------------------------
+// Class for spectrum analysis using FFT
+//
+// 2016/07/23, Copyright (c) 2015 MIKAMI, Naoki
+//-------------------------------------------------------
+
+#include "FFT_Analysis.hpp"
+
+namespace Mikami
+{
+ FftAnalyzer::FftAnalyzer(int nData, int nFft)
+ : AnalyzerBase(nData, nFft, nFft),
+ yFft_(nFft/2+1) {}
+
+ void FftAnalyzer::Analyze(const float xn[], float yn[])
+ {
+ fft_.Execute(xn, yFft_); // Execute FFT
+
+ // Translate to dB
+ for (int n=0; n<=N_FFT_/2; n++)
+ yn[n] = 10.0f*log10f(Norm(yFft_[n]));
+ }
+}