License Information

ZI-NARASHI

©︎ ZI-NARASHI | Audio Normalizer

Operated by AMIX / JP

Copyright of the source code, design, and content of this tool belongs to the creator.

Technologies Used

This tool is built with the following technologies:

• Web Audio API — Audio analysis, filtering, real-time processing
• OfflineAudioContext — Offline rendering (LUFS calculation, effects processing)
• Canvas API — Waveform drawing, LUFS timeline visualization
• File API — File loading and WAV export
• MediaRecorder API — OGG/Opus encoding (browser standard)

Third-Party Libraries

• lamejs v1.2.1 — MP3 encoding library
  License: LGPL-2.1（GNU Lesser General Public License v2.1）
  https://github.com/nicst4/lamejs

Notes on Audio Processing

LUFS（Loudness Units relative to Full Scale）calculation uses ITU-R BS.1770 standard K-weighting filter (high shelf + high pass).

Momentary LUFS (400ms window) and Short-term LUFS (3-second window) are EBU R128 compliant measurement methods.