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📁 MARK'S DOC
🔗 Linked Evidence
Review_Division_Submission_3_of_3 — p.1
📄 Review Division Submission 3 of 3 | p.1
📄 Review Division Submission 3 of 3 | p.1
📝 Extracted Text (OCR)
Il1.B Quantified Acoustic Telemetry: The 328 Hz Resonance On January 29, 2026, the worker conducted his own on-site acoustic measurement using a calibrated USB condenser microphone, Audacity, and 440 Hz / 1000 Hz reference tones to verify measurement accuracy. Measurements were taken from three positions: left ear (facing a glass partition), right ear (facing the server racks directly), and behind the head (shielded). The data identified a dominant mechanical resonance spike at 328 Hz — a frequency known to be capable of stimulating tensor tympani muscle activity. The glass partition to the worker's left was acting as an acoustic reflector, directing reflected energy into the worker's left ear canal. A measured ~70 dB drop in the shielded position confirms that the exposure was directional and location-specific, not a generalized ambient hum. This telemetry, with calibration records, was submitted to WorkSafeBC on February 6, 2026 as part of the worker's Acoustic Trauma Brief. The Clinical Opinion does not reference this telemetry, the 328 Hz resonance frequency, the glass-reflection geometry, or the calibration methodology at any point. Evidence: Acoustic Trauma Brief and Telemetry