Assertion: pilot tone | /r/HasProperty | infrasonic
Facets:
value: at a frequency of 25 hz
type: TEMPORAL
value: below the normal hearing range
type: OTHER
value: of above it
type: OTHER
Source sentences:
text: In AM stereo, the bandwidth is too narrow to accommodate subcarriers, so the modulation itself is changed, and the pilot tone is infrasonic (below the normal hearing range, instead of above it) at a frequency of 25 Hz.