noisemasking
nounUK /ˈnɔɪzˌmɑːskɪŋ/
US /ˈnɔɪzˌmæskɪŋ/
Noise masking is when one sound covers up another sound so you don't hear it.
The soft music was noise masking the traffic outside.
OTHER MEANINGS
2. Using a steady background sound to help you sleep or focus.
She uses noise masking with a fan to fall asleep faster.
3. In audio, adding sound to hide unwanted noise.
The app does noise masking to remove the hum from the recording.
4. In hearing care, covering up ringing in the ears with gentle sound.
His hearing aid has a noise masking setting for tinnitus.