Dynamic Audio Normalizer ~ Advanced Normalization


Dynamic Audio Normalizer is a library for advanced audio normalization purposes. It applies a certain amount of gain to the input audio in order to bring its peak magnitude to a target level (e.g. 0 dBFS). However, in contrast to more “simple” normalization algorithms, the Dynamic Audio Normalizer dynamically re-adjusts the gain factor to the input audio. This allows for applying extra gain to the “quiet” sections of the audio while avoiding distortions or clipping the “loud” sections. In other words: The Dynamic Audio Normalizer will “even out” the volume of quiet and loud sections, in the sense that the volume of each section is brought to the same target level. Note, however, that the Dynamic Audio Normalizer achieves this goal without applying “dynamic range compression”. It will retain 100% of the dynamic range within each “local” region of the audio file.

The Dynamic Audio Normalizer is available as a small standalone command-line utility and also as an effect in the SoX audio processor as well as in the FFmpeg audio/video converter. Furthermore, it can be integrated into your favourite DAW (digital audio workstation), as a VST plug-in, or into your favourite media player, as a Winamp plug-in. Last but not least, the “core” library can be integrated into custom applications easily, thanks to a straightforward API (application programming interface). The “native” API is written in C++, but language bindings for C99 Microsoft.NETJavaPython and Pascal are provided.

http://muldersoft.com/#dyauno
https://github.com/lordmulder/DynamicAudioNormalizer

Spek ~ Acoustic Spectrum Analyzer


Spek (IPA: /spɛk/, ‘bacon’ in Dutch) helps to analyse your audio files by showing their spectrogram. Spek is free software available for Unix, Windows and Mac OS X.

Features:

  • Supports all popular lossy and lossless audio file formats thanks to the FFmpeg libraries.
  • Ultra-fast signal processing, uses multiple threads to further speed up the analysis.
  • Shows the codec name and the audio signal parameters.
  • Allows to save the spectrogram as an image file.
  • Drag-and-drop support; associates with common audio file formats.
  • Auto-fitting time, frequency and spectral density rulers.
  • Adjustable spectral density range.
  • Translated into 19 languages.

spek

http://spek.cc/
https://github.com/alexkay/spek

Planet CCRMA ~ Linux Audio Workstation


Planet CCRMA at Home is a (large) collection of free, open source software packages that you can add to a computer running Fedora 22, 23 or 24 or CentOS 5 to transform it into an audio/video oriented workstation. Here at Stanford University CCRMA we use a consistent and well defined Linux environment for our daily work in audio and computer music and research. With the Planet CCRMA at Home package collection, you can easily install most of that environment on your own Linux system. Planet CCRMA is easy to install and maintain, it can also be installed and upgraded over the network from the Planet CCRMA repositories or its mirrors.

http://ccrma.stanford.edu/planetccrma