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Auphonic Leveler – Batch Audio File Processor for Loudness

The Auphonic Leveler is an intelligent Desktop Batch Audio File Processor which analyzes your audio and corrects level differences between speakers, between music and speech and between multiple audio files to achieve a balanced overall loudness.
It includes a True Peak Limiter and targets for common Loudness Standards (EBU R128, ATSC A/85, Podcasts, Mobile, etc.).

The Auphonic Leveler is available for Mac OS X 10.6+ (64bit) and Windows Vista/7/8 (32bit or 64bit).

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)

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