Assertion: order filter | /r/CapableOf | reduce the signal amplitude
Facets:
value: by half
type: OTHER
Source sentences:
text: A first-order filter , for example, reduces the signal amplitude by half (so power reduces by a factor of 4, or 6 dB) , every time the frequency doubles (goes up one octave); more precisely, the power rolloff approaches 20 dB per decade in the limit of high frequency.