A stopband is a band of frequencies, between specified limits, through which a circuit, such as a filter or telephone circuit, does not allow signals to pass, or the attenuation is above the required stopband attenuation level. Depending on application, the required attenuation within the stopband may typically be a value between 20 and 120 dB hig...
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http://en.wikipedia.org/wiki/Stopband
the primary region of reflection or absorption of a rejection filter.
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http://www.chemistry-dictionary.com/definition/stopband.php
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