I've been travelling recently and at multiple stations there have been speakers emitting a bleep every second. (For example Stansted Airports station).

Is there a reason for this?

  • 3
    Sound markings for the blind?
    – Janka
    Jun 16 '19 at 0:27
  • Do you have a recording? I can't think what this would be.
    – Muzer
    Jun 17 '19 at 13:29
  • Might have found one myself - is it the very faint beep every second you hear at this point in this video? youtu.be/gRu9_OWfr-g?t=102 I definitely can't think what that would be, besides perhaps interference in some speaker system from a mechanical clock, as @anon suggested.
    – Muzer
    Jun 17 '19 at 14:15
  • @Muzer yep that is it faintly in that video. I'll record it next time I'm there regardless.
    – Cjen1
    Jun 19 '19 at 0:36

Is the bleep louder every 10 seconds, even louder every minute, even louder every 10 minutes, even louder every hour, and loudest at 10:00:00, 20:00:00, and 00:00:00? If so, it might be the mechanism of the station clocks. Many of the older clocks with digital display make a clicking sound every second as one or more of the six figures changes.

  • We thought it might be that but the sounds were coming from a speaker rather than the clock. Additionally they were all the same loudness. Good idea though.
    – Cjen1
    Jun 17 '19 at 11:29
  • 1
    Based on the video I found, I suspect this is in fact the answer - some mechanical clock system was perhaps inducing stray current in some dodgy speaker cabling somewhere, thus resulting in this noise. I could be wrong though, it's a very weird sound, and this is just a guess. I certainly can't think of any other purpose.
    – Muzer
    Jun 17 '19 at 14:16

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.