ContourExtractor

Pitch contour extractor for batch processing of complete audio files.

Creates a complete pitch contour from raw audio, suitable for:

• Offline melody evaluation

• Pitch analysis of recorded audio

• Comparing reference and student performances

The extractor is reusable - call extract() on multiple audio files with the same configuration, then release() when done.

Includes artifact rejection and correction:

• Amplitude gating: Rejects frames below RMS threshold (configurable in dB)

• Confidence thresholding: Rejects frames with low confidence

• Octave correction: Fixes octave detection errors (frequency doubling/halving)

• Outlier rejection: Rejects isolated pitch points based on continuity