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"I long ago realized that I could reach far more people by writing something, than by walking down the street with a banner."
- John Brunner

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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Additional resources:
  More Ideas and Technology from Ringworld
  More Ideas and Technology by Larry Niven
  Tech news articles related to Ringworld
  Tech news articles related to works by Larry Niven

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