Autres/audacity
1
0
Fork 0
mirror of https://github.com/cookiengineer/audacity synced 2025-10-21 14:02:57 +02:00
Code Issues Releases Wiki Activity

Code cleanup: removed the old real FFT code not used since at least 2009.

Browse Source 
I confirmed that the currently used real FFT code in RealFFTf.cpp is faster
than the old one with a quick benchmark that calls PowerSpectrum() on 4-minute
audio file, with different sizes of computation windows:

Window_size: 256 method: new FFT time_s: 0.393
Window_size: 256 method: old FFT time_s: 1.065
Window_size: 1024 method: new FFT time_s: 0.38
Window_size: 1024 method: old FFT time_s: 0.958
Window_size: 4096 method: new FFT time_s: 0.413
Window_size: 4096 method: old FFT time_s: 1.084
Window_size: 16384 method: new FFT time_s: 0.518
Window_size: 16384 method: old FFT time_s: 1.338
Window_size: 65536 method: new FFT time_s: 0.655
Window_size: 65536 method: old FFT time_s: 1.524
Window_size: 262144 method: new FFT time_s: 0.735
Window_size: 262144 method: old FFT time_s: 1.873
This commit is contained in:
Raphaël Marinier
2016-06-25 16:23:56 +02:00
parent cf79f91da0
commit 6ac68db5be
10 changed files with 8 additions and 210 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
src/Experimental.h
View File

@@ -107,10 +107,6 @@
// Paul Licameli (PRL) 29 Nov 2014
// #define EXPERIMENTAL_IMPROVED_SEEKING
// Philip Van Baren 01 July 2009
// Replace RealFFT() and PowerSpectrum function to use (faster) RealFFTf function
#define EXPERIMENTAL_USE_REALFFTF
// RBD, 1 Sep 2008
// Enables MIDI Output of NoteTrack (MIDI) data during playback
// USE_MIDI must be defined in order for EXPERIMENTAL_MIDI_OUT to work