If your cat meows at you silently, you may not be able to hear it, but that doesn't mean that other felines won't. Cats are capable of picking up significantly higher sounds than people are -- with maximums of between 50 and 60 kilohertz. Human beings are only able to hear up to a meager 18 to 20 kilohertz -- a far cry from the kitty range. A silent meow is likely just any old standard meow -- just a lot higher.