Faint melody randomly sounds

[Jonny702]

I listen to music on my commute every day while also using a handful of various apps. I notice occasionally I can hear this faint melody like a tone coming from my phone playing under the music. It's not app specific and I can't find the tone in my ringtone settings. I use 8.1 developer preview on my Lumia 920. Anyone else notice this? I think the strangest part is that it plays under my music and it's not just the song.

 

[Nerdy Woman]

Some apps have a very faint notification sound. i.e, there's a barely audible tone when Words with Friends notifies me that it's my turn.

But you're saying this tone plays, yet there's nothing in the Notification Center afterward?

 

[trwrt]

Do you have it plugged into a charger? Maybe there is a bad connection that goes in and out as the car shakes it and it's triggering the little charging tune.

 

[Jonny702]

That's right and it's not plugged in. It's the strangest thing. Nothing in notifications afterward. It's definitely made me curious. I'll investigate more and see what I can come up with

 

[nicfromwales]

I often hear a faint sound of receiving an email on my phone, without having actually received one. Thought I was just going crazy.

 

[Jonny702]

I've now been able to hear it more often. Without headphones or music playing. Last time was right after I sent a text and before that was while I was browsing the web. It's like a sound you'd expect I you were waiting for something to load. Dum de dumde dum I wish I could get a recording of it

 

[Jonny702]

Okay I finally discovered what the sound was. I believe the sound is related to NFC and I've heard it when a device taps another device. I can't for the life of me figure out why, in my case, it was going off randomly, but of course disabling NFC has made the sound stop