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.

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KEY FEATURES
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◆ 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.

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USE CASES
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• 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.

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PRIVACY BY DESIGN
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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.