Noise Alert

What is Noise Alert?
Noise Alert is a real-time occupational noise screening tool designed for workplace environments where understanding noise exposure is critical. It measures sound levels, tracks accumulated exposure, and helps determine whether further professional measurement or corrective action may be required. It focuses on exposure, dose, and regulatory interpretation, extending its functionality beyond simple sound measurement.

Noise Alert is intended for preliminary screening and awareness. It does not replace calibrated or certified sound level meters.

Features Overview:
Core Measurement:
- A-weighted sound level measurements (dBA)
- C-weighted peak levels (dBC)
- Equivalent continuous sound level (LAeq)
- Peak sound pressure levels (Lpeak, LCpeak)
- Real-time noise dose accumulation
- 8-hour equivalent exposure (LEX,8h)
- OSHA Time-Weighted Average (TWA)
- Compliance-oriented threshold comparison

Exposure metrics are calculated using energy-equivalent accumulation to ensure consistency over time.

Session & Analytics:
- Session History with brief measurement params
- Detailed Session Cards with all necessary data, geo-tags and graphs
- Aggregated charts for trends analysis
- Session-to-session comparison tool

Exports:
- Detailed PDF/CSV exports of recorded sessions

Advanced Features (Noise Alert PRO):
- Ad-free experience
- Unlimited data exports
- Unlimited session history retention
- Fully customizable compliance mode
- Extended session duration (beyond 2h limit)
- Extended analytical timelines (1W, 1M, 3M)
- Advanced aggregated charts
- UI lock and auto-lock for pocket mode

Workplace noise risk is rarely defined by a single loud moment. Hearing damage often occurs gradually, through prolonged exposure to moderate but harmful noise levels, leading safety engineers and users to ask:

How much exposure has accumulated?
Are action levels approaching?
Does this task meaningfully contribute to daily dose?
Is formal measurement likely necessary?

The goal is not just measurement, but informed decision-making and awareness.

Noise Alert may support the following situations:
Pre-inspection screening:
- Quickly assess whether an area may exceed regulatory thresholds before deploying certified equipment.

Shift exposure estimation:
- Monitor extended activities and estimate accumulated dose over time.

Equipment and maintenance checks:
- Compare machine noise before and after servicing.

Task-based exposure assessment:
- Evaluate short-duration tasks that may significantly impact total daily exposure.

Hearing conservation support:
- Provide indicative data to support workplace awareness and internal documentation.

Noise Alert includes compliance-oriented modes aligned with:
- OSHA (5 dB exchange rate, 90 dBA criterion)
- NIOSH REL (3 dB exchange rate, 85 dBA criterion)
- EU Workplace Noise Directive
- UK Control of Noise at Work
- Australia Work Health & Safety

Each mode applies appropriate exchange rates, criterion levels, and action thresholds to interpret exposure metrics consistently with regulatory frameworks.

Additional details for occupational safety engineers:
- Energy-based LAeq and exposure accumulation
- Separation of analytical calculations from display smoothing
- Fixed-interval real-time processing
- Adaptive data persistence for long monitoring sessions
- Hardware clipping detection with peak risk classification
- Manual calibration adjustment
- Device offset correction
- Structured data export for reporting and documentation
- Long sessions are supported through optimized data handling that preserves exposure accuracy while maintaining performance.

Intended Use:
Noise Alert is designed as a preliminary occupational screening tool.
For legally binding compliance measurements, use properly calibrated and certified sound level measurement equipment.

Recent changes:
Noise Alert 0.88.16-beta

Fixed:
- crash during database update due to security chip refusal under load
- session history is not discarded anymore if app was unable to unlock its database several times in a row