DecibelMaster Pro: Sound Meter

shuttletechnologies

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About this app

🔊 DecibelMaster Pro — Precision Sound Level Meter (SLM), Occupational Noise Dosimeter & Real-Time 9-Band FFT Octave Frequency Spectrum Analyzer!

Engineered to meet rigorous acoustic measurement standards (IEC 61672-1 Type 2 compliance), DecibelMaster Pro transforms your Android smartphone into a professional, lab-grade sound pressure level (SPL) meter. Whether you are an industrial hygienist assessing workplace compliance (OSHA / NIOSH), an audio engineer calibrating acoustic environments, a homeowner checking neighbor noise, or a safety officer protecting hearing health, DecibelMaster Pro delivers unparalleled measurement precision, beautiful visual telemetry, and 100% on-device privacy.

🌟 CORE FEATURES & CAPABILITIES:

1. 🎙️ Laboratory-Grade Sound Level Meter (SPL)
• Real-time digital sound pressure level measurement with ultra-responsive analog gauge and high-visibility digital readout.
• Frequency Weighting Filters:
- A-Weighting (dBA): Replicates the human ear response across ordinary environmental and speech frequencies.
- C-Weighting (dBC): Optimized for low-frequency rumble, industrial machinery, subwoofers, and engine noise.
- Z-Weighting (dBZ): Flat unweighted frequency response for laboratory acoustics.
• Time Weighting Constants: Fast (125ms) for dynamic transients and Slow (1000ms) for stable average readings.
• Real-time statistical telemetry: Instantaneous dB, Minimum (MIN), Time-Average (AVG / Leq), Maximum (MAX), and Absolute Peak (PEAK).

2. 📊 Real-Time 9-Band 1/1 Octave FFT Spectrum Analyzer
• Radix-2 Cooley-Tukey Fast Fourier Transform (FFT) algorithm with Hann windowing to eliminate spectral leakage.
• Visualizes audio energy across all 9 standard IEC octave frequency bands:
63 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz, and 16 kHz.
• 3 interactive visualizer modes: Live Oscilloscope Waveform, Historical Chrono-Trend Line, and 9-Band Animated Equalizer Spectrum.

3. ⏳ Occupational Noise Dosimeter & 8-Hour TWA
• Dual Standards Support:
- OSHA PEL: 90 dBA Criterion Level, 85 dBA Threshold, 5 dB Exchange Rate.
- NIOSH REL: 85 dBA Criterion Level, 80 dBA Threshold, 3 dB Exchange Rate.
• Computes real-time Cumulative Shift Dose (%), Permissible Exposure Hours remaining, and 8-Hour Time-Weighted Average (8H TWA).
• Extrapolates Projected 8-Hour Daily Dose based on active session exposure.

4. 🛡️ Background Monitoring Foreground Service
• Continuous acoustic monitoring even when the application is minimized or the device screen is turned off.
• Low-overhead persistent Android notification displaying live decibel levels and hazardous noise warnings.
• Instant notification alerts when sound levels exceed user-defined danger thresholds (e.g. 85 dBA).

5. 📁 Session Recording, History & CSV/JSON Export
• Save full measurement runs with session titles, location tags, and notes.
• Review past sessions with comprehensive telemetry cards and visual charts.
• Export session data seamlessly to CSV and JSON formats for audit reporting, noise complaints, or engineering analysis.

6. 🌓 System Default Theme & Multi-Language Engine
• 6 visual themes: System Default (auto dark/light sync), Cyber Studio, OLED Stealth, High-Voltage Amber, Accent Teal, and Acoustica Clean Light.
• Fully localized across 8 major languages: English, Spanish, German, French, Japanese, Arabic, Hindi, and Portuguese.

7. 🎯 One-Tap Microphone Calibration
• Manual acoustic offset tuning (+/- 20.0 dB in 0.1 dB increments) to calibrate your device against a certified reference sound calibrator.

🔒 100% PRIVATE — NO AUDIO STORED:
DecibelMaster Pro computes sound pressure purely in ephemeral RAM. No audio is ever recorded, stored to disk, or transmitted over any network.

What’s new

• Official Production Release of DecibelMaster Pro (versionCode 9)!
• Real-time IEC 61672 Type 2 sound level meter with dBA, dBC, and dBZ weighting.
• 9-Band 1/1 octave FFT frequency spectrum visualizer (63 Hz - 16 kHz).
• OSHA & NIOSH compliant occupational noise dosimeter with 8H TWA and projected dose.
• Background noise monitoring foreground service with sticky notification.
• System Default theme auto-syncing with Android device dark/light mode.