As low electronic hums began to be heard, spectral figures emerged from the shadows.

The equipment was still working; a faint electronic hum seeped through the skin of his palm.

Down here, the oscillating electronic hum was muffled, almost inaudible.

Riker heard an electronic hum coming from the forward portion of the vessel.

An electronic hum in the song had made it unusable.

I heard an electronic hum, and the gate opened.

The inaudible hiss gathers itself up into a low electronic hum.

An electronic hum from the transporter stage gave him his answer.

Massive computers were there, with their reels and red lights, giving off a low electronic hum.

There was a faint electronic hum in the air, almost a sigh.