You hear one thing, but the computer hears another. What’s going on here?

Two researchers from the University of California, Berkeley have exploited the technique computers use to decode human speech to hide messages inside snippets of audio. When translated by a speech recognition program like Mozilla’s DeepSpeech, the computer ends up transcribing the hidden message instead of the sounds we hear.
Do You Hear What I Hear?
The method basically involves hiding a quiet sample of the audio