Tone Detection and DOA Estimation

This project implements real-time tone detection and direction-of-arrival (DOA) estimation using the C language. It is designed for integration with LabVIEW via DLLs.

🔧 Features

• Custom FFT implementation (Cooley-Tukey Radix-2 DIT)
• CFAR based tone detection algorithm
• Phase-difference DOA estimation from two microphone signals
• Rolling buffer of last 10 DOA angle results for LabVIEW plotting

📁 Files

• tone_detector.c – Main source file containing FFT, CFAR, and DOA functions
• tone_detector.h – Header file
• vii.png – LabVIEW block diagram screenshot
• 

📌 Usage

1. Compile tone_detector.c into a DLL using LabWindows/CVI or compatible C compiler.
2. In LabVIEW, use "Call Library Function Node" to call ProcessAudio or EstimateDOA.

🧠 Function Descriptions

ProcessAudio(...)

Detects tone frequency in mono signal using FFT and CFAR.

EstimateDOA(...)

Calculates DOA angle using phase difference at the tone frequency bin between two microphone signals.