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Displacement detection device for a portable apparatus

  • US 7,672,806 B2
  • Filed: 11/30/2005
  • Issued: 03/02/2010
  • Est. Priority Date: 12/01/2004
  • Status: Active Grant
First Claim
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1. A portable device controlled by user-imparted motion, comprising:

  • a handheld portable device;

    a detection device comprising;

    an acceleration sensor generating a first acceleration signal relating to a first axis of detection in response to user-imparted motion of the handheld portable device, anda displacement detection circuit connected to said acceleration sensor and comprising a first comparator stage for comparing said first acceleration signal with a first acceleration threshold and generating a first displacement detection signal indicative of a displacement of the device along the first axis of detection of the acceleration sensor relative to a reference position, said displacement detection circuit further comprises first filtering means arranged between said acceleration sensor and said first comparator stage and configured to reduce a DC component of said first acceleration signal that is due to an acceleration of gravity and reset the reference position of the device, the displacement detection circuit further comprising a hysteresis memory element having a first input and a second input;

    said first comparator stage having an output connected to said first input, and a second comparator stage having an output connected to said second input and adapted to compare said first acceleration signal with a second acceleration threshold lower than said first acceleration threshold; and

    a microprocessor coupled to the displacement detection circuit to generate control signals to the handheld portable device.

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