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<a accesskey="3" href="page.php?w=signal-to-noise_ratio&amp;p=2">3.Next</a>
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<p><b>Signal-to-noise ratio</b> (<b>SNR</b> or <b>S/N</b>) is a measure used in <a href="page.php?w=science_and_engineering">science and engineering</a> that compares the level of a desired <a href="page.php?w=signal">signal</a> to the level of background <a href="page.php?w=Noise_%28signal_processing%29">noise</a>. SNR is defined as the ratio of signal <a href="page.php?w=Power_%28physics%29">power</a> to <a href="page.php?w=noise_power">noise power</a>, often expressed in <a href="page.php?w=decibel">decibel</a>s. A ratio higher than 1:1 (greater</p><p>
<a accesskey="3" href="page.php?w=signal-to-noise_ratio&amp;p=2">3.Next</a>
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