Last spring Plantronics, a telephone headset manufacturer in Santa Cruz, Calif ., developed a technology for reducing microphone noise.
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In the case of the microphone noise-reduction technology, defensive publishing was simply a cheaper, faster alternative to patenting one invention that was not part of the company's core business.
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Measured using ITU-R 468 noise weighting, this is about 66 dB below alignment level, or 84 dB below digital full scale, which is somewhat lower than the microphone noise level on most recordings, and hence of no consequence in 16-bit audio ( see programme level for more on this ).
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For example, to test the sensitivity of a microphone noise-reducing filter, the test administrator could generate artificial noise in a laboratory setting to determine whether the microphone suppresses the noise ( i . e . filters it out ), or interprets the noise as something that is not noise ( i . e . passes it through ).
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