9‑SAI
Song BPM & Key Detector — Ninth‑Generation Segmented Audio Intelligence
9‑SAI divides your audio into 9 temporal segments · Multi‑pass validation · Confidence‑based consensus
BPM (Beats Per Minute)
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Musical Key
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Our Technology
9-SAI (9‑Segment Audio Intelligence) — Song BPM & Key Detector
9-SAI (9‑Segment Audio Intelligence) is a proprietary analysis engine designed to extract tempo (BPM) and harmonic key from any musical audio with exceptional precision. Instead of treating a track as a single block, the system divides the audio into nine temporal segments—capturing the structural evolution from intro to outro—and processes each through a cascade of intelligent validation layers.
🔬 Multi‑Pass Key Validation
Every segment undergoes two independent harmonic analyses using different FFT resolutions. Results are cross‑checked to eliminate false positives and ensure only the most confident key is carried forward.
📊 Harmonic Confidence Scoring
A weighted scoring model measures how consistently the same key appears across the nine segments. Exact matches receive higher weight than relative (major/minor) relationships, producing a reliability percentage you can trust.
🎼 Relative Key Intelligence
The engine understands musical relationships like C major ↔ A minor. When a segment suggests a relative key, the system intelligently combines them—delivering results that respect real‑world harmonic modulation.
⚖️ Outlier Rejection & Consensus
Isolated segments with divergent values are automatically de‑weighted. The final BPM and key are drawn from the most consistent groups, ensuring that intros, bridges, or noisy sections never skew the final result.