Assertion: hearing aid | /r/CapableOf | use microphone
Facets:
value: to alter an acoustic signal
type: PURPOSE
Source sentences:
text: A digital hearing aid also uses a microphone, but a microprocessor performs most of the device's functions digitally.
text: An analog hearing aid employs miniature devices, such as microphones, amplifier s, and resistor s to alter an acoustic signal (a sound) electronically.