Toolbox/Tutorials

These are stubs of articles explaining topics in digital audio and Audacity source code.

Foundations

Audio Foundations

Waveform with regular samples

• Toolbox/Digital Audio - How audio waves are represented as a series of number, and the difference between lossless formats like .wav and lossy formats like 'mp3'.
• Toolbox/Audio Compression - Why you can't 'compress twice' and do better.
• Toolbox/Spectrograms - How sound is represented as frequencies
• Toolbox/Inside the Ear - How the ear works. (includes source separation)
• Toolbox/Inside a Microphone - How a (typical) microphone works
• Toolbox/Echoes and Reverb - Why a church 'sounds different'. (with samples)

Mathematical Foundations

• Toolbox/Radians vs Degrees - Why use radians to measure angles
• Toolbox/A Whirlwind Tour of Trigonometry - Sin, Cos, Pythagoras (with links)
• Toolbox/Why Complex Numbers - Why use the square root of -1 in Audio algorithms

Fourier Transforms

• Toolbox/Fourier Transforms Informally
• Toolbox/Fourier Transform Equations

Languages

• Toolbox/C++ Idioms
• Toolbox/Nyquist Language
• Toolbox/Scripting

Audacity Algorithms

Overview

Audacity Architecture

• ArchitecturalDesign
• Toolbox/Audacity Classes
  • Toolbox/Dialogs - including the Shuttle System (ShuttleGUI)
  • Toolbox/Preferences Dialogs
  • Toolbox/Menus
  • Toolbox/Toolbars
• Toolbox/Libraries

Special Topics

• Toolbox/Translation
• Toolbox/Accessibility
• Toolbox/Discoverability

Data

Audio Data Flow

• Toolbox/Audio Data Flow
• Toolbox/Blockfiles
• Toolbox/SQLite

Drawing

• Toolbox/Drawing Waveforms Quickly
• Toolbox/Drawing Spectrograms Quickly
• Toolbox/Cells and Overlays
• Toolbox/Real and Flyweight Widgets

Time Domain Audio Algorithms

• Toolbox/Generators
• Toolbox/Echo and Reverb
• Toolbox/Truncate Silence

Frequency Domain Audio Algorithms

• Toolbox/Noise Reduction
• Toolbox/Resampling
• Toolbox/Spectral Reassignment