Assertion: detector | /r/CapableOf | use narrowband microphones
Facets:
value: simply
type: MANNER
Source sentences:
text: Simpler detectors simply use narrowband microphones tuned to frequencies typical of glass shattering, and react to sound above certain threshold, whereas more complex designs compare the sound analysis to one or more glass-break profiles using signal transforms similar to DCT and FFT and react if both the amplitude threshold and statistically expressed similarity threshold are breached.