DecibelPulse: Sound Meter

DecibelPulse is a modern, high-precision sound level meter (SLM) and noise logger designed for acoustics engineers, audio professionals, safety inspectors, and sound enthusiasts. Engineered with a clean OLED dark aesthetic, DecibelPulse turns your Android device into a reliable acoustic measurement instrument with real-time waveform visualization, IEC 61672-1 time weighting, and comprehensive session logging. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ KEY FEATURES ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ◆ PRECISION SOUND LEVEL METER • High-accuracy decibel (dB SPL) calculations computed directly from 16-bit 44.1 kHz uncompressed PCM audio buffers. • Calibrated dynamic range covering ambient quiet rooms to high-noise environments. • Real-time peak, minimum (Floor), and Equivalent Continuous Sound Level (L_eq) acoustic energy averaging. • Dynamic neon color-coded severity indicators: Quiet (Emerald), Moderate (Cyan), Loud (Amber), and Hazardous (Crimson). ◆ REAL-TIME 60 FPS OSCILLOSCOPE • Silky-smooth waveform visualizer powered by a dedicated low-latency digital signal processing (DSP) engine. • Microsecond downsampling running on dedicated background threads ensures zero UI stutter and minimal battery consumption. ◆ IEC 61672-1 TIME WEIGHTING • Fast Weighting (125 ms): Ideal for tracking fluctuating acoustic transients, speech, and impulsive events. • Slow Weighting (1000 ms): Best for measuring stable environmental sound levels, industrial hums, and average background noise. ◆ INTERACTIVE NOISE LOGGING & ROOM DATABASE • Log continuous time-series noise sessions with high temporal resolution (2 Hz sample rates). • Browse your historical noise sessions in an intuitive modal sheet. • Interactive timeline profile: Drag and scrub across the interactive graph with precise timestamp and dB crosshair tracking. ◆ SEAMLESS DATA EXPORT & CALIBRATION • One-tap RFC-4180 compliant CSV export via Android FileProvider. Easily share session logs with Google Drive, email, or spreadsheet software. • Fine-grain microphone calibration offset (+/- 20 dB in 0.5 dB steps) with live test audio feedback to calibrate against reference SPL hardware. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ USE CASES ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ • Environmental & workplace noise compliance monitoring. • Audio gear and home studio acoustic testing. • Neighborhood noise, traffic, and appliance noise logging. • Classroom, library, and office sound level awareness. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ PRIVACY BY DESIGN ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ DecibelPulse prioritizes your privacy above all: • Ephemeral Audio Processing: Audio captured from the microphone is analyzed strictly in RAM to compute numerical RMS decibels and is discarded immediately. • No Audio Recording: The app never records or stores raw audio to disk. • Completely Offline: No internet permission, no accounts, and no third-party analytics trackers.