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Portable device with freefall detection or audio processing subsystem and freefall detection or audio processing method

  • US 20070223123A1
  • Filed: 03/22/2006
  • Published: 09/27/2007
  • Est. Priority Date: 03/22/2006
  • Status: Active Grant
First Claim
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1. A method for determining that a disk device is in freefall, including the steps of:

  • (a) determining from acceleration data indicative of instantaneous acceleration of the disk device whether said instantaneous acceleration is less than gravitational acceleration during a first time interval of predetermined duration;

    (b) determining from the acceleration data whether said instantaneous acceleration has a time derivative whose absolute magnitude exceeds a predetermined minimum value during a second time interval having a second predetermined duration; and

    (c) determining that the disk device is in freefall by determining that said instantaneous acceleration is not less than gravitational acceleration during the first time interval and the absolute magnitude of the time derivative of said instantaneous acceleration does not exceed the predetermined minimum value during the second time interval.

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