Why are "these fat carp gone below deck" used for speech experiments?

Question

Speech recognition

in fact, why is this phrase being used, "these fat carp have gone under deck"?

Answer 1

Probably for the same reason why the phrase about citrus is used in fonts: Uniform distribution of the sound spectrum when pronouncing this phrase. Plus, the absence of combinations that can be misunderstood with interference (fifty or sixty for example)