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: MyClasses_Functions/FFT_Analysis.cpp
- Revision:
- 0:9470a174c910
- Child:
- 2:1f092ac020e1
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MyClasses_Functions/FFT_Analysis.cpp Sun May 22 06:28:40 2016 +0000 @@ -0,0 +1,28 @@ +//------------------------------------------------------- +// Class for spectrum analysis using FFT +// +// 2015/12/15, Copyright (c) 2015 MIKAMI, Naoki +//------------------------------------------------------- + +#include "FFT_Analysis.hpp" + +namespace Mikami +{ + FftAnalyzer::FftAnalyzer(int nData, int nFft) + : AnalyzerBase(nData, nFft, nFft), + yFft_(new Complex[nFft/2+1]) {} + + FftAnalyzer::~FftAnalyzer() + { + delete[] yFft_; + } + + 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])); + } +}