linuxaudio.org

> A variation on this is used to check the authenticity of some

quoted text
> recordings in forensic audio. Almost all 'surveillance' audio

> contains some low level 50/60 Hz. If the recording is done on

> a digital device then its clock can be assumed to be more stable

> than the mains frequency

At least in NA, mains frequency is very very stable. The entire

continent is in phase and clocked with very high precision.  It's more

stable than a free-running digital clock.
...I used this fact to 'cheat' in a high school physics contest where

we had to build a clock and the winner was the most stable.  Ours had

a CdS cell that watched the 120Hz flicker of the lights in the room.
Monty

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