This is the synthesized sound of a walkie-talkie beginning to transmit.
I once had a walkie-talkie that made this sound as a feedback; this is the same sound, made with Audacity.

GENERATING:
File > New
Generate > Noise (Type: White, Amplitude: 0.4, Duration: 0.05s)
Effects > Low-Pass Filter (Rolloff: 36 dB, Cutoff: 4000)
Select from 0.0s to 0.02s
Effects > Cross Fade-In
Select from 0.03s to 0.05s
Effects > Cross Fade-Out
Cursor at 0.05s
Generate > Silence (Duration: 0.5s)

Comments

• 
  BFDIUser20 1 year, 10 months ago

  Eh, pretty good. :P
• 
  imbebie2 2 years, 4 months ago

  Thanks..

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