Decibel Clean: Sound Meter

Decibel Clean is a professional sound level meter (SLM), industrial noise dosimeter, and acoustic evidence workstation engineered for occupational safety specialists (CIH/CSP), acoustic consultants, and audio engineers. Built on a low-latency 48 kHz DSP engine, Decibel Clean delivers calibrated sound pressure level (SPL) monitoring, OSHA/NIOSH shift dosimetry, forensic camera evidence, and certified PDF reports.

◆ ⚡ ZERO LAG, ZERO ADS — BUILT LIKE A SYSTEM UTILITY
• Instant Cold-Start (<100ms): Opens immediately with active SPL measurement. Zero splash delay, zero loading spinners, and zero waiting to capture sudden noise spikes.
• 100% Ad-Free Forever: Zero banner ads, zero interstitial video popups, and zero interruptions. Your acoustic readings and audits are never blocked.
• 100% Offline & Private: No account required, zero tracking cookies, and zero audio ever leaves your phone. Everything is processed in-memory on-device.

◆ PRECISION SOUND LEVEL METER (IEC 61672 CLASS 2)
• Real-time A, C, and Z frequency weighting curves (dBA, dBC, dBZ)
• Fast (125 ms) and Slow (1000 ms) time weighting integration
• Responsive needle gauge paired with a continuous 60-second rolling sparkline waveform
• Real-time tracking of Leq (Equivalent Continuous Sound Level), Lmin, Lmax, and Lpeak

◆ OCCUPATIONAL NOISE DOSIMETRY (OSHA, NIOSH & ISO 1999)
• Multi-standard compliance: OSHA 1910.95 (90 dBA criterion, 5 dB exchange, 85 dBA action level), NIOSH 98-126 (85 dBA criterion, 3 dB exchange), and ISO 1999:2013 / EU 2003/10/EC
• Real-time Circular Dose Ring: live daily dose %, 8-hour projected Time-Weighted Average (TWA), and safe exposure remaining countdown
• Background Dosimetry Service: continuous all-shift noise tracking via foreground service with display turned off

◆ FORENSIC ACOUSTIC EVIDENCE CAMERA HUD
• Photo and video recording with real-time HUD watermark overlays
• Certified metadata stamp: calibrated SPL readout, timestamp, GPS coordinates, and hazard rating (Safe, Moderate, Action Level, PEL Violation, Extreme Danger)
• Indisputable photographic evidence for industrial hygiene audits and municipal noise complaints

◆ STATISTICAL PERCENTILES & SPECTRAL DYNAMICS
• Full statistical exceedance percentiles: L10 (transient peak noise), L50 (median ambient), and L90 (background noise floor)
• Crest factor and dynamic sound range analysis
• Automated regulatory compliance determinations (Compliant, Action Required, Violation)

◆ CERTIFIED PDF AUDIT REPORTS & 10 HZ CSV TELEMETRY
• Generate branded, audit-ready PDF compliance dossiers directly from your device
• Complete with regulatory pass/fail summary tables, statistical percentiles, attached camera evidence, and inspector signature block
• High-frequency 10 Hz raw CSV time-series telemetry export for advanced analysis in Excel, Python, or MATLAB

◆ ACOUSTIC SESSION REPLAY & LOGBOOK
• Historical session logbook with date filtering (Today, 7 Days, 30 Days, All)
• Acoustic job waveform replay with interactive seeking and variable playback speeds

◆ HARDWARE ACOUSTIC CALIBRATION WIZARD
• Factory-aligned microphone presets for Samsung Galaxy, Google Pixel, and Motorola devices
• External calibrator wizard: precision 1/10th dB alignment using 94.0 dBA and 114.0 dBA acoustic calibrator couplers

◆ DECIBEL REFERENCE & EXPOSURE GUIDE
• Real-world acoustic benchmarks from 0 dB (Faint/Library) to 140 dB (Jet Takeoff/Acoustic Trauma) with OSHA/NIOSH recommended exposure durations

◆ 100% PRIVATE & ZERO-OPS VAULT
• Zero audio cloud ingestion: microphone frames are processed in-memory and discarded immediately; no raw audio or voice recordings ever leave your phone
• Pure #000000 AMOLED dark mode for battery savings during 8-hour shift audits
• Storage Access Framework (SAF) integration for encrypted database backup to Google Drive or local storage