Assertion: fire engine's siren | /r/CapableOf | incorporate modulator
Facets:
value: to synthesize a selected siren tone
type: PURPOSE
Source sentences:
text: Electronic sirens incorporate circuits such as oscillators, modulators, and amplifiers to synthesize a selected siren tone (wail, yelp, pierce/priority/phaser, hi-lo, scan, airhorn, manual, and a few more) which is played through external speakers.