system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can we tell when audio is backwards even when there aren't words?

Why does it not sound like someone speaking a completely differe?nt language. Or if it's white noise, why does it not still sound like regular white noise?
gpt
As a rule, audio sources start loud and then fade. Think of a guitar string, for example. Even if a sound starts and ends abruptly like a hand clap, echo from the surroundings fades over time. When played backwards the difference is is easily detectable.

True continuous white noise will bot be distinguishable when played forward or backward.