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by drblast 4571 days ago

  >or you need to use a “sufficiently strong wide-band noise 
  >source.” Something like a swooping, large-orchestra 
  >classical concerto would probably do it.
Unless you're standing next to a live orchestra that's playing the concerto on specially designed dog-whistles, you're going to have a pretty hard time masking anything near the 150 kHz range.