Memory management in event recording systems

  • US 8,374,746 B2
  • Filed: 12/07/2006
  • Issued: 02/12/2013
  • Est. Priority Date: 12/08/2005
  • Status: Active Grant
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First Claim
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1. A vehicle event recorder comprising:

  • a camera configured to obtain optical images and to convert the obtained optical images into electronic signals;

    a managed loop buffer memory comprising a rewriteable, electronic storage medium of finite size and configured to receive the electronic signals from the camera and to store the electronic signals as discrete video frames;

    an event trigger configured to generate a trigger signal; and

    an overwrite device electronically coupled to the managed loop buffer memory and to the event trigger,the overwrite device being arranged to manage data overwrite operations such that the managed loop buffer memory stores video frames in an interleaved fashion and increases a rate of video frame storage beginning at a first predetermined time before the trigger signal and subsequently decreases the rate of video frame storage after a second predetermined time following the trigger signal.

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