FAQ - How do you detect tampering and alterations?
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How do you detect
tampering and alterations?
Electrical interference exists everywhere. It originates from external sources (electrical outlets, cell phones, radio & TV signals, etc...) and from within the recording device (dirty or scratched recording heads, unshielded circuitry, low grade recording medium, etc...). Most of these sources leave a cyclical or rhythmic pattern buried within the final recording.
disruptions in these seemingly invisible patterns, we can document edits
within the recording. By locating duplicate non-overlapping patterns, we can detect dubbing. And by analyzing sub-pixel data, we can detect alterations (e.g. objects added or removed from a picture or video).
Similar methods are used to pattern gunshots or other audio events. The results are
then documented in a textual and graphical report. If you want to learn
more about HOW TO DO THIS, then you may wish to read Detecting and preventing file tampering.