不韋 呂
Realtime sound spectrogram using FFT or linear prediction. Spectrogram is displayed on the display of PC. リアルタイム･スペクトログラム．解析の手法：FFT，線形予測法．スペクトログラムは PC のディスプレー装置に表示される．PC 側のプログラム：F446_Spectrogram.
Dependencies: Array_Matrix mbed SerialTxRxIntr F446_AD_DA UIT_FFT_Real
Diff: MySpectrogram/FFT_Analyzer.cpp
- Revision:
- 6:c38ec7939609
- Parent:
- 0:a539141b9dec
- Child:
- 7:5ba884060d3b
--- a/MySpectrogram/FFT_Analyzer.cpp Sun Oct 07 05:15:04 2018 +0000
+++ b/MySpectrogram/FFT_Analyzer.cpp Sun Nov 04 10:41:02 2018 +0000
@@ -1,7 +1,7 @@
//-------------------------------------------------------
// Class for spectrum analysis using FFT
//
-// 2017/02/04, Copyright (c) 2017 MIKAMI, Naoki
+// 2018/11/04, Copyright (c) 2018 MIKAMI, Naoki
//-------------------------------------------------------
#include "FFT_Analyzer.hpp"
@@ -17,7 +17,7 @@
fft_.Execute(xn, yFft_); // Execute FFT
// Translate to dB
- for (int n=0; n<=N_FFT_/2; n++)
+ for (int n=2; n<=N_FFT_/2; n++)
yn[n] = 10.0f*log10f(Norm(yFft_[n]));
}
}