Auphonic Leveler – Batch Audio File Processor for Loudness

auphonic leveler

Auphonic, a young audio software company from Austria, have released Auphonic Leveler, an intelligent batch audio file processor for Mac OS X and Windows that manages the loudness of audio files based on the latest loudness standards for broadcasting.

Auphonic Leveler makes automatic adjustments that are compliant with new loudness standards (EBU R128, ATSC A/85, ITU-R BS.1770, etc.) and includes a True Peak Limiter and an Adaptive Leveler, which corrects loudness variations within one audio file.

Auphonic Leveler’s Adaptive Leveler algorithm has been developed and trained for several years by processing audio files that were uploaded to Auphonic’s web service. In fact, the algorithm keeps learning and adapting to new data on a daily basis. This is what makes Auphonic Leveler quite a unique batch audio file processor: it combines machine learning, digital signal processing and big data.

Auphonic Leveler Feature Highlights – Algorithms

Adaptive Leveler

The Adaptive Leveler analyzes the content of audio files and balances loudness variations between different segments in one audio file. It is most suitable for speech or radio-like programs or podcasts.

  • The algorithm classifies music, background and speech segments in the audio file
  • Loudness differences are corrected by applying dynamic range compression
  • Music segments are handled differently than speech segments: natural dynamics are retained
  • Background noises (noise, wind, breathing, silence, etc.) won’t be amplified

Loudness Normalization

Global Loudness Normalization algorithms calculate the loudness of audio files and apply a constant gain to reach a defined target level in LUFS, so that all processed audio files have the same average loudness based on the latest broadcast standards including those for television (EBU R128, ATSC A/85), radio and mobile.

True Peak Limiter

Auphonic Leveler’s True Peak Limiter, with 4x oversampling to avoid intersample peaks, is used to limit the final output signal to the selected maximum true peak level to ensure compliance with the selected loudness target.

Adaptive High Pass Filter

The Adaptive High Pass Filter cuts unnecessary and disturbing low frequencies, depending on context.

Supported Input File Formats:

  • WAV, AIFF, FLAC, MP3, Ogg Vorbis
  • Mac OS X only: MP4/M4A/M4B, AAC, ALAC, CAF, AC3, MP2, 3GP

Supported Output File Formats:

  • WAV, AIFF, MP3 (via lame), FLAC, Ogg Vorbis
  • Mac OS X only: AAC (M4A)

More info (additional features, audio examples, pricing, trial download):

Auphonic Leveler

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