TARDIS Technical Index

Perception Filter

(aka Distraction Field)

Perception filter in action

Timeships conceal themselves by embedding themselves into local culture - making the capsule even harder to notice. While the Auto-Systems ensure that crew members' Reality Quotient remains stable at 1.0 the Quotient of the TARDIS itself remains at only 0.9. This lower quotient is achieved using the dimensionally transcendental chameleon circuit in combination with the telepathic circuits. Since the TARDIS's reality quotient is slightly below 1.0 it effectively creates a low-level Perception Filter or Distraction Field that makes people passing by the TARDIS less likely notice anything odd about it by shifting attention away from it. This field is ineffective on people who are actively looking for something unusual or the object in question. The TARDIS uses this filter to reduce its impact on history.

If a TARDIS refuels by absorbing energy from a spatial-temporal rift it is likely that the ship's perception properties will be welded to that point in space by the rift. Anything placed on the patch of ground the TARDIS was parked on will become virtually invisible unless someone knows exactly what they are looking for. Portable high-level Perception Filters can be built using TARDIS keys.

Color Key

The following color code is used:

  • Black: For information from the TV Series, including Dimensions in Time, and 1996 TV Movie.
  • Blue: For information from the Novels and Audios including Target, Virgin, BCC, and Big Finish.
  • Green: For information from 'licensed' reference sources such as the Technical Manual, Doctor Who Magazine, and the Role Playing Games.
  • Red: For information from unofficial sources -The Faction Paradox series, behind the scenes interviews, author's speculation, and popular fan belief.
  • The TARDIS Technical Index is copyright Will B Swift.

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