Spectrum Analyser

A real-time FFT spectrum analyser built with JUCE. It captures live audio input and displays a frequency spectrum using a fast Fourier transform.

Prerequisites

• JUCE - clone or download it to your machine
• A C++ compiler for your platform:
  • Windows: Visual Studio 2019 or 2022/2026
  • macOS: Xcode
  • Linux: GCC/Clang + make

Setup

1. Clone this repository:

   git clone <repo-url>
   cd SpectrumAnalyser
   

2. Clone JUCE alongside this project (or anywhere on your machine):

   git clone https://github.com/juce-framework/JUCE.git
   

3. Open the Projucer (found in JUCE/extras/Projucer) and open SpectrumAnalyser.jucer at the repo root.

4. In the Projucer, set the Global Paths → JUCE modules path to point to your local JUCE/modules folder, then re-save the project. This updates the build files with the correct paths.

Building & Running

Windows (Visual Studio)

Open the solution and run:

Builds\VisualStudio2026\SpectrumAnalyser.sln

Press F5 to build and run, or Ctrl+F5 to run without the debugger.

A Visual Studio 2019 solution is also available at Builds\VisualStudio2019\SpectrumAnalyser.sln

macOS (Xcode)

Open:

Builds/MacOSX/SpectrumAnalyser.xcodeproj

Press ⌘R to build and run.

Linux (Make)

cd Builds/LinuxMakefile
make CONFIG=Release
./build/SpectrumAnalyser

Usage

The app reads from your system default audio input device. Before launching, go to your OS sound settings and set the microphone you want to use as the default input device.

Once running, grant any audio permission prompt and the spectrum display will update in real time.