What is Aliasing

Aliasing occurs when continuous signals are sampled at a rate that is too low to accurately capture all frequency components.

While this explanation might sound abstract, its practical implications are significant. So, what exactly constitutes a signal, and how does this concept apply in real-world scenarios?

There are numerous examples of aliasing effects, but we will focus on three key areas:

• Audio signals, for instance, can be understood as 1D signals. These are sampled over time at a specific frequency. If the sampling frequency is too low, aliasing effects will occur.
  • aliasing in audio signals
• Rasterizer. While audio demonstrates aliasing in the time domain, rasterization shows similar effects in the spatial domain. A rasterizer, as the name suggests, it converts a vector image to a raster image.
  • aliasing in image rasterization
• image downsampling