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⬛ CLASSIFIED · LEVEL-4 TACTICAL ASSET · OFFLINE-FIRST ⬛

Tactical Acoustic Intelligence Engine

Military-grade acoustic analysis and electronic countermeasure suite — built on Flutter.
Turns any Android device into a real-time audio intelligence platform.

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📡 System Overview

SYNCX transforms a standard Android device into a highly sensitive, real-time audio intelligence tool. It calculates wave interference, maps spectral density, and securely logs environmental audio intercepts — all completely offline, all on-device.

Objective	Capability
🌊 Time Domain	Live oscilloscope telemetry at 60fps
📊 Frequency Domain	Pure-Dart FFT with Hanning Window
🔇 Noise Cancellation	Mathematical 180° destructive interference calculation
📄 Dossier Export	Vector-graphic PDF reports with embedded GPS metadata
🔐 Secure Storage	Encrypted, localized audio intercept database

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🧩 Core Operating Modules

⚡ MODULE I — WAVE  ·  Time Domain Oscilloscope

A highly responsive dual-oscilloscope renderer that maps raw audio buffer data into visual amplitude in real-time.

• Original Acoustic Signature — Plots the live microphone input continuously.
• Destructive Interference — Calculates and renders the exact 180° inverted phase required to mathematically neutralize the incoming sound wave.
• Dynamic Scaling — Advanced fl_chart integration with manual and auto-scaling:
  • X-Axis: s · ms · ns
  • Y-Axis: Amp · V · dB

📊 MODULE II — FFT  ·  Frequency Domain & Sonar

Executes a pure-Dart Fast Fourier Transform using a Hanning Window function to eliminate spectral leakage.

• FFT Spectrogram — Converts the time-domain wave into a 50-bin bar chart isolating dominant environmental frequencies from 0 Hz to 22 kHz.
• Sonar Heatmap (Waterfall) — Custom CustomPaint engine rendering a rolling 60-frame 2D thermal heatmap, allowing real-time tracking of transient acoustic events over time.

🎯 MODULE III — BLUEPRINT  ·  Threat Analysis & Mitigation

The strategic engine of the application. Cross-references acoustic data with geolocational metadata to generate actionable physical responses.

• Target Variables — Absolute frequency, wavelength (λ), and peak Amplitude in dB SPL.
• Passive Material Specs — Computes physical acoustic baffle thickness via the quarter-wavelength rule:

  d = λ / 4

• PDF Dossier Export — Compiles metrics, GPS data, and vector-drawn FFT/Waveform charts into a multi-page tactical report.
• Encrypted Intercept — Suspends the live analysis engine to capture a covert 3-second .m4a (AAC-LC) audio sample.

🗂️ MODULE IV — ARCHIVES  ·  Local Database Ledger

A secure, offline local ledger powered by shared_preferences.

• Data Logging — Timestamped entries storing Hz, dB, GPS coordinates, and mathematical parameters.
• Hardware Media Controls — audioplayers integration for local decryption and playback of .m4a intercepts with fail-safes for corrupted files.
• Secure Erase — Targeted filesystem-level deletion to completely purge audio files and data structures from the device.

📡 MODULE V — COMMS  ·  System Protocols & Hardware Integration

The global control center for app-wide states and hardware overrides.

• Stealth Protocol — A global state listener that instantly strips all neon styling, gradients, and box-shadows, reverting the app to a high-contrast, low-emission pitch-black UI — preventing screen glare and conserving battery.
• Tactical Dosimetry — A global auditory monitoring system. When environmental noise exceeds 95 dB SPL, the app triggers a visual hazard overlay and interfaces with the physical device motor (vibration package) to deliver tactical haptic feedback.

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⚙️ Technical Specifications

Framework & Platform

Framework  :  Flutter (Dart)
Platform   :  Android
Chipset    :  MediaTek Dimensity (Optimized)
Render     :  60 FPS — fl_chart
FFT Window :  Hanning / 50-bin
Freq Range :  0 Hz — 22,000 Hz
Audio Fmt  :  .m4a / AAC-LC
Intercept  :  3 seconds
Hazard dB  :  95 dB SPL
Sonar Buf  :  60 frames FIFO
Network    :  OFFLINE-FIRST

Core Dependencies

Package	Role
fl_chart	Vector-based, 60fps graph rendering
flutter_animate	State-driven UI micro-interactions
pdf + printing	Native PDF generation and layout routing
record	Hardware-level AAC audio encoding
audioplayers	Media playback engine
geolocator	GPS / GNSS satellite locking
vibration	Low-level haptic motor interfacing
shared_preferences	Encrypted local database

Android Permissions Required

<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.INTERNET" />  <!-- dev handshake only -->

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🛡️ Engineering Countermeasures

Bug fixes and stability hardening built into the architecture.

[01] FLEXBOX OVERFLOW HARDENING
     LayoutBuilder + Flexible + FittedBox — graceful scaling
     across portrait, landscape, and foldable form factors.

[02] MEMORY LEAK PREVENTION
     FFT Sonar Heatmap enforces a strict 60-frame FIFO buffer.
     RAM usage remains permanently flat during extended sessions.

[03] AUDIO STATE COLLISION FIX
     Strict handshake protocol between audio_service and record
     package prevents AudioRecord engine crashes on mode switch.

[04] UNICODE PDF SANITIZATION
     Greek symbols (λ, π) and degree modifiers (°) are stripped
     before PDF rendering — eliminating "Tofu Box" font errors.

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🔭 Phase II — Future Roadmap

  ┌─────────────────────────────────────────────────────────┐
  │                                                         │
  │  01  ON-DEVICE AI FINGERPRINTING                        │
  │      TinyML (TensorFlow Lite) — classify frequencies    │
  │      against a database of mechanical & vehicular        │
  │      acoustic signatures. No cloud. No exposure.        │
  │                                                         │
  │  02  SEISMIC STETHOSCOPE MODE                           │
  │      Poll raw data from onboard MEMS Gyroscope &        │
  │      Accelerometer for structural / infrasound          │
  │      analysis. Device becomes a seismic detector.       │
  │                                                         │
  │  03  ACOUSTIC STEGANOGRAPHY                             │
  │      Inaudible ultrasonic data-transfer protocol        │
  │      operating at 19 kHz – 21 kHz for secure,          │
  │      air-gapped device-to-device communication.         │
  │      Zero RF emission signature.                        │
  │                                                         │
  └─────────────────────────────────────────────────────────┘

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SYNCX · Tactical Acoustic Intelligence Engine
Built with Flutter · Offline-First · Zero Cloud Exposure

⬛ ALL SYSTEMS NOMINAL — SIGNAL LOCKED ⬛