Mladen Adamovic / Spectrogram

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Dependencies:   F746_GUI F746_SAI_IO UIT_FFT_Real

Fork of F746_Spectrogram by 不韋 呂

MySpectrogram/FFT_Analysis.cpp@3:6a2c8ff46f73, 2016-08-15 (annotated)

Committer:
MikamiUitOpen
Date:
Mon Aug 15 06:51:01 2016 +0000
Revision:
3:6a2c8ff46f73
Parent:
MyClasses_Functions/FFT_Analysis.cpp@2:1f092ac020e1
Child:
6:b3885567877c
4

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:9470a174c910 1 //-------------------------------------------------------
MikamiUitOpen 0:9470a174c910 2 // Class for spectrum analysis using FFT
MikamiUitOpen 0:9470a174c910 3 //
MikamiUitOpen 2:1f092ac020e1 4 // 2016/07/23, Copyright (c) 2015 MIKAMI, Naoki
MikamiUitOpen 0:9470a174c910 5 //-------------------------------------------------------
MikamiUitOpen 0:9470a174c910 6
MikamiUitOpen 0:9470a174c910 7 #include "FFT_Analysis.hpp"
MikamiUitOpen 0:9470a174c910 8
MikamiUitOpen 0:9470a174c910 9 namespace Mikami
MikamiUitOpen 0:9470a174c910 10 {
MikamiUitOpen 0:9470a174c910 11 FftAnalyzer::FftAnalyzer(int nData, int nFft)
MikamiUitOpen 0:9470a174c910 12 : AnalyzerBase(nData, nFft, nFft),
MikamiUitOpen 2:1f092ac020e1 13 yFft_(nFft/2+1) {}
MikamiUitOpen 0:9470a174c910 14
MikamiUitOpen 0:9470a174c910 15 void FftAnalyzer::Analyze(const float xn[], float yn[])
MikamiUitOpen 0:9470a174c910 16 {
MikamiUitOpen 0:9470a174c910 17 fft_.Execute(xn, yFft_); // Execute FFT
MikamiUitOpen 0:9470a174c910 18
MikamiUitOpen 0:9470a174c910 19 // Translate to dB
MikamiUitOpen 0:9470a174c910 20 for (int n=0; n<=N_FFT_/2; n++)
MikamiUitOpen 0:9470a174c910 21 yn[n] = 10.0f*log10f(Norm(yFft_[n]));
MikamiUitOpen 0:9470a174c910 22 }
MikamiUitOpen 0:9470a174c910 23 }