Assertion: heterodyne frequency | /r/HasProperty | audible
Facets:
value: directly
type: MANNER
Source sentences:
text: The name "superheterodyne" was a contraction of "supersonic heterodyne", to distinguish it from receivers in which the heterodyne frequency was low enough to be directly audible, and which were used for receiving "continuous wave" (CW) Morse code transmissions (not speech or music).