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"All fiction is propaganda, and the fiction we like is the propaganda we believe in, and the fiction we don't like is the propaganda we don't believe in."
- Samuel R. Delany

Sound Deadener  
  Device that acts to damp excessive noise produced by different species.  

It's just another day in Krushenko's in New York City.

One kzin alone sounded like a catfight. Four kzinti in heated argument sounded like a major feline war, with atomics. Sonic deadeners went on automatically in the restaurant, and the snarls became remote, but they went on.
From Ringworld, by Larry Niven.
Published by Ballantine in 1970
Additional resources -

Compare to the hush corner from Robert Heinlein's 1956 novel Double Star and the Fenton silencer from Arthur C. Clarke's 1957 short story Silence Please, published in the collection Tales from the White Hart.

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  More Ideas and Technology from Ringworld
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