DFasma is free open-source software which is used to compare audio files in time and frequency. The comparison is first visual, using waveforms and spectra. It is also possible to listen to time-frequency segments in order to allow perceptual comparison. It is basically dedicated to analysis. Even though there are basic functionalities to align the signals in time and amplitude, this software does not aim to be an audio editor.

Features:

• Can load about 25 different audio formats (thanks to libsndfile or libsox).
• Shows spectrogram, amplitude, phase spectra and group delay.
• Can play a filtered sound given a selected frequency band.
• Rectification of the spectrogram tilt (cepstral lifting).
• Can create and edit segmentation files.
• Can create and edit fundamental frequency (F0) files (thanks to REAPER).
• Runs under Linux, Mac OSX and Windows.

gillesdegottex.github.io/dfasma