There is a pretty characteristic intermittent pulsing buzz / hum kind of sound ( i know, terrible description ) that comes over poorly shielded speakers when a cell phone communicates with the cell network nearby.
2.
Tinnitus maskers may use music or natural sounds, wide band white or pink noise, narrow band white noise, a notched soundfield, frequency or amplitude modulated sound, intermittent pulsed sound, or other patterned sound.
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