Pre-echo
= Pre-echo
{wiki=Pre-echo}
Pre-echo is an audio phenomenon that occurs during sound encoding and compression, particularly in lossy formats such as MP3 or AAC. It refers to the unintended audible distortion that precedes a loud sound, often manifesting as a faint echo-like effect. This can happen due to how certain audio encoding algorithms handle transient sounds—sharp, sudden changes in sound levels.