NIOSH Sound Level Meter Pro

# Decibel Meter Pro: AI Sound **Decibel Meter Pro: AI Sound** is an all-in-one acoustic engineering and noise measurement suite. Engineered for sound technicians, workplace safety inspectors, environmental researchers, acoustic enthusiasts, and everyday users, this app transforms your device into a certified-grade sound level meter (SPL), occupational noise dosimeter, AI sound classifier, camera noise evidence recorder, and precision tone generator. --- ### Precision Decibel Meter & SPL Analyzer Measure environmental sound pressure levels (SPL) in real time with high accuracy: - **Instantaneous Sound Pressure**: Real-time dB readings with an ultra-responsive radial gauge (0 to 120+ dB). - **Acoustic Readouts**: Instant, Minimum (Min), Maximum (Max), and Average (Avg) decibel tracking. - **Live Waveform Chart**: Track sound level variations over time with dynamic scrolling waveform graphs. - **Hardware Calibration**: Adjust microphone sensitivity with custom ±dB calibration offsets. - **Reference Scale**: Compare measurements against real-world references (30 dB to 140 dB). ### Occupational Noise Dosimeter (OSHA & NIOSH) Protect hearing and maintain workplace compliance with standard dosimeter monitoring: - **Standards Presets**: Switch between **NIOSH REL** (85 dB / 3 dB), **OSHA HC** (90 dB / 5 dB), and **OSHA PEL**. - **Real-Time & Projected Dose %**: Monitor live noise dose accumulation and projected 8-hour daily exposure. - **TWA & Leq Metrics**: Calculate accurate Time-Weighted Average (TWA) and Equivalent Continuous Sound (Leq). - **Hearing Risk Alerts**: Real-time color-coded safety guidance (Safe, Action Level, Hazardous). - **Session History**: Save, review, and manage completed dosimeter sessions with exposure data. ### AI Sound Recognition & Classifier Powered by on-device Edge AI machine learning (TensorFlow Lite / YAMNet): - **Real-Time Sound Recognition**: Identifies speech, sirens, alarms, dogs, machinery, music, and nature. - **Confidence Scoring**: Displays real-time detection probability percentages for every sound event. - **Event Timeline**: Logs detected environmental sounds chronologically with exact timestamps. - **100% On-Device Privacy**: All neural network processing runs locally—zero audio is sent to the cloud. ### Camera Sound Overlay & Visual Evidence Document noise violations, workplace audits, and neighborhood sound levels with photo evidence: - **Live Decibel HUD**: Real-time dB, Peak dB, Min/Max/Avg, and timestamps overlaid on viewfinder. - **Watermarked Capture**: Save calibrated photo evidence with embedded sound stats to gallery. - **Dual Camera**: Switch seamlessly between front and rear cameras for handheld and site audits. ### Audio Frequency Generator (20 Hz – 20 kHz) Generate pure sine wave frequencies across the entire audible spectrum: - **Full Spectrum Range**: Smoothly sweep from 20 Hz sub-bass to 20,000 Hz treble. - **Gesture Controls**: Adjust frequencies with vertical drag gestures and quick presets (Low, Mid, High). - **Acoustic Testing**: Perfect for speaker testing, subwoofer tuning, room acoustics, and tinnitus relief. --- ### Privacy & Battery Efficiency - **Zero Cloud Recording**: Audio is processed in memory only; never recorded or shared. - **Optimized Performance**: Native audio processing with minimal battery drain. - **Adaptive Themes**: Clean Light & Dark modes for high contrast in all lighting. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/