A random beep I hear occasionally during phone calls on Project Fi with my Nexus 5x.

Project Fi random beep in call

Beep 2 - Sprint

Beep 1 - Sprint

Beep in call with Project Fi - T-mobile

From a new ModMic 4 attached to a pair of headphones. Not sure what the source of the ticking is. Some kind of electromagnetic interference?

The ModMic is plugged in to a Sabrent USB stereo sound adapter, which is plugged into a USB extension cord, which is plugged into a rear "USB Audio" port on my computer, which is powered by a UPS plugged into the wall. The ticking sound can be heard at certain points throughout the recording.

ModMic 4 and the Mysterious Ticking Noise - Test #1

From a new ModMic 4 attached to a pair of headphones. Not sure what the source of the ticking is. Some kind of electromagnetic interference?

The ModMic is plugged in to a Sabrent USB stereo sound adapter, which is plugged into a rear USB port on my computer (different port from last test) which is powered by a UPS plugged into the wall. All other USB devices except the mouse and keyboard have been disconnected. The ticking sound can be heard at certain points throughout the recording.

Recorded in Audacity on Linux.

ModMic 4 and the Mysterious Ticking Noise - Test #2

From a new ModMic 4 attached to a pair of headphones. Not sure what the source of the ticking is. Some kind of electromagnetic interference?

The ModMic is plugged in to a Rode VXLR+ 3.5mm to XLR adapter, which is plugged into the mic input on a Behringer Xenyx 302 USB mixer, which is plugged into a USB port on my computer, which is powered by a UPS plugged into the wall. The ticking sound can be heard at certain points throughout the recording.

ModMic 4 and the Mysterious Ticking Noise - Test #3

From a new ModMic 4 attached to a pair of headphones. Not sure what the source of the ticking is. Some kind of electromagnetic interference?

The ModMic is plugged in to the front mic input on my computer, which is powered by a UPS plugged into the wall. The ticking sound can be heard at certain points throughout the recording.

ModMic 4 and the Mysterious Ticking Noise - Test #4

From a new ModMic 4 attached to a pair of headphones. Not sure what the source of the ticking is. Some kind of electromagnetic interference?

The ModMic is plugged in to a Sabrent USB audio adapter, which is plugged into a 2012 Macbook Pro running on battery. The ticking sound can be heard at certain points throughout the recording. It sounds different than previous tests, for the most part.

ModMic 4 and the Mysterious Ticking Noise - Test #5

The audio output, recorded from headphones, with the volume at max, with me adjusting the PC volume - there is no sound effect, but this does start up an audio stream to the mixer, beginning with a pop, and ending with a pop, after an idle period of several seconds.

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