# Support & Help Center — Decibel Meter Pro: AI Sound
Welcome to the official Support and Help Center for **Decibel Meter Pro: AI Sound** for iOS. If you have questions about using the app, calibrating measurements, managing subscriptions, or troubleshooting any features, you will find comprehensive guides and answers below.
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## 📱 App Overview
- **App Name**: Decibel Meter Pro: AI Sound
- **Category**: Utilities / Sound Measurement & Acoustics
- **Compatibility**: iOS 15.0 or later (iPhone, iPad)
- **Official Support Email**: mobilebusiness1992@gmail.com
- **Response Time**: Within 24–48 business hours
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## 🚀 Quick Start Guide
### 1. Real-Time Decibel Meter (SPL)
- **Start / Stop Monitoring**: Tap the central **dB** button on the bottom navigation bar to start or pause live sound measurement.
- **Reading Metrics**:
- **Instant dB**: Real-time sound pressure level displayed on the central radial gauge.
- **Min / Max / Avg**: Continuous tracking of the quietest, loudest, and average sound levels during your session.
- **Live Waveform**: Dynamic scrolling graph visualizing sound fluctuations over time.
- **Calibration**: Tap the **Calibrate** button below the gauge to adjust microphone sensitivity with a manual offset (±dB) to match calibrated reference hardware.
### 2. Occupational Noise Dosimeter (OSHA & NIOSH)
- **Select Standard**: Tap the top standard pill to switch between **NIOSH REL** (85 dB criterion / 3 dB exchange rate), **OSHA HC** (90 dB / 5 dB), and **OSHA PEL**.
- **Live Dose & Projected 8h Dose**: The central ring shows accumulated noise dose percentage (%) and estimated full-day exposure.
- **TWA & Leq**: View accurate Time-Weighted Average (TWA, 8-hour) and Equivalent Continuous Sound Level (Leq).
- **Risk Banners**: Visual safety alerts indicate whether current levels are **Safe**, at **Action Level**, or **Hazardous**.
- **Session History**: Tap the clock icon in the top right to view, analyze, or delete saved exposure sessions.
### 3. AI Sound Recognition & Classifier
- **Start Listening**: Open the **AI Sound** tab and tap **Start AI Detection**.
- **Real-Time Classification**: On-device machine learning instantly classifies environmental sounds (speech, sirens, alarms, dogs, machinery, music, nature).
- **Confidence Scores**: View live detection percentages and a chronological event history with precise timestamps.
- **Privacy**: 100% on-device processing. No audio is recorded, saved, or uploaded to any cloud server.
### 4. Decibel Camera HUD & Photo Watermarking
- **Open Camera**: Tap the **Camera** tab to open the full-screen viewfinder.
- **Live Sound HUD**: Real-time dB, Peak dB, Min/Max/Avg, and timestamps appear directly overlaid on the camera feed.
- **Capture Evidence**: Tap the shutter button to save high-resolution, watermarked photo evidence directly to your iOS Photos gallery.
- **Camera Flip**: Tap the flip icon to switch between front and rear cameras.
### 5. Audio Frequency & Tone Generator
- **Frequency Spectrum**: Sweep pure sine wave tones from **20 Hz** (sub-bass) to **20,000 Hz** (treble).
- **Gesture Control**: Drag vertically anywhere on the live wave animation to fine-tune frequencies.
- **Range Presets**: Tap **Low** (20–250 Hz), **Medium** (251–2000 Hz), or **High** (2001–20,000 Hz) for quick navigation.
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## ❓ Frequently Asked Questions (FAQ)
### Q1: Why does the app require microphone access?
**A**: The microphone is required strictly to calculate real-time sound pressure levels (dB), frequency spectrums, dosimeter exposure metrics, and on-device AI sound classification.
### Q2: Is my voice or audio recorded or uploaded?
**A**: **No.** Audio signals are analyzed in volatile memory on your device in real time and are immediately discarded. We never record, store, or transmit your audio to remote servers.
### Q3: How accurate is the iOS Decibel Meter?
**A**: Modern iPhone and iPad microphones provide high linearity and accuracy for everyday and occupational sound monitoring. For laboratory-grade precision, use the in-app **Calibrate** tool to align readings with an external Type 1/2 sound level meter.
### Q4: What is the difference between OSHA and NIOSH standards?
**A**:
- **NIOSH REL**: More protective standard (85 dBA criterion, 3 dB exchange rate) recommended for hearing conservation.
- **OSHA HC**: OSHA Hearing Conservation standard (90 dBA criterion, 5 dB exchange rate, 80 dB threshold).
- **OSHA PEL**: OSHA Permissible Exposure Limit (90 dBA criterion, 5 dB exchange rate, 90 dB threshold).
### Q5: How do I restore my Pro subscription on a new device?
**A**: Open **Settings** or the **Pro upgrade screen** inside the app and tap **Restore Purchases**. As long as you are signed in with the same Apple ID used for the original purchase, your Pro access will restore immediately.
### Q6: How do I cancel or manage my subscription?
**A**: All iOS subscriptions are managed directly by Apple:
1. Open the **Settings** app on your iPhone or iPad.
2. Tap your **Apple ID name** at the top.
3. Tap **Subscriptions**.
4. Select **Decibel Meter Pro** and choose **Cancel Subscription**.
### Q7: How do I request a refund?
**A**: Since all financial transactions are processed directly by Apple, refund requests must be submitted through Apple's official portal at:
https://reportaproblem.apple.com
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## 🛠️ Troubleshooting Guide
### Issue 1: The meter shows 0 dB or microphone permission was denied
- **Solution**:
1. Open your iPhone **Settings**.
2. Scroll down and tap **Decibel Meter** (or **Bd Meter**).
3. Toggle **Microphone** to **ON** (Green).
4. Return to the app and tap the center dB button.
### Issue 2: Camera screen is black or cannot take photos
- **Solution**:
1. Open iPhone **Settings** > **Decibel Meter**.
2. Ensure **Camera** permission is enabled.
3. Ensure **Photos** access is set to **Add Photos Only** or **Full Access** so the app can save watermarked evidence to your camera roll.
### Issue 3: Calibration offset reset
- **Solution**: If you ever want to return to default factory settings, navigate to **Settings** > **Reset App Preferences** inside the app.
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## 🔒 Privacy & Safety Disclaimer
- **Informational Use**: Decibel Meter Pro is designed for informational, educational, and occupational monitoring assistance. It does not replace certified industrial sound level equipment where mandated by legal enforcement.
- **Hearing Protection**: Sound levels exceeding 85 dB over prolonged periods can cause permanent hearing damage. Always use appropriate hearing protection (earplugs/earmuffs) in high-noise environments.
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## 📬 Contact Support
If you encounter any issues, bugs, or have feature suggestions, please reach out to our dedicated support team:
- **Email**: mobilebusiness1992@gmail.com
- **Subject Line**: `[iOS Support] Decibel Meter Pro - Issue Inquiry`
### Please include the following details in your email:
1. **Device Model**: (e.g., iPhone 15 Pro, iPad Air M2)
2. **iOS Version**: (e.g., iOS 17.5)
3. **App Version**: (Found under Settings > App Info)
4. **Description of the issue**: (What happened, and steps to reproduce)
5. **Screenshots or screen recordings**: (If applicable)