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In radio communication and electronics, this may include Thermal Noise , Blackbody , and any other interfering signals. In a measurement system such as a Seismograph , it may include nearby foot traffic or a nearby road. The noise floor limits the smallest measurement that can be taken since any measured amplitude can be no less than the noise floor.
A common way to lower the noise floor in electronics systems is to cool the system to reduce thermal noise, which is usually the major noise source.