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A comment on SETI spots dozens of new mysterious signals emanating from distant galaxy. Parent comment

Re:SETI spots dozens of new mysterious signals emanating fro... by garmaine on Tuesday September 18, 2018 @06:00PM (#18019574)
This isn’t true. If the signal was below the noise threshold, and no mechanism provided for detecting noise separately (as twisted pair provides, for example) it would be literally impossible to separate signal from noise. That’s what the noise threshold means.

GPS is not below the level of background noise. Not is sonar.

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