synaudio

The synaudio library synchronizes two similar audio clips using the Pearson Correlation Coefficient.

This is implemented using Web Assembly SIMD instructions to used significantly increase performance. A single and multi-threaded Web Worker implementation is available as well that further increases performance.

This library is used in icecast-metadata-player to synchronize Icecast streaming audio between different connections and audio codecs.

How to use the demo

Sync Two Clips

• Select two audio clips (one base clip, and one comparison clip).
• Click Find Correlation to find the sample offset within the base audio where the comparison audio matches with the best correlation.
• Play the result audio, which is the comparison audio spliced into the base audio at the sample offset, to sonically verify the correlation result.
  • When the correlation coefficient is high (over 50%) the match will likely align with sample accurate results.
  • When the correlation coefficient is low (under 50%) there is likely not a match between the base and comparison audio clips.

Sync Multiple Clips

• Select two or more audio clips.
• Click Find Correlation to find the best match between all the clips.
• Play the resulting audio clips(s), which represents the best match(es) between all the clips, to sonically verify the correlation results.
  • Hover over the Results area to see the list of matches.
  • Each match within Results is a nested array representing a chain of matching audio clips.