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Envelope modulator for haptic feedback devices

  • US 20030057934A1
  • Filed: 07/29/2002
  • Published: 03/27/2003
  • Est. Priority Date: 07/17/2001
  • Status: Active Grant
First Claim
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1. An amplitude modulator circuit comprising:

  • A reference oscillator;

    An envelope modulator coupled to the reference oscillator for receiving a reference signal;

    A microcontroller coupled to the envelope modulator for providing an envelope signal to the envelope modulator;

    A low pass filter coupled to the envelope modulator for receiving a modulated command from the envelope modulator;

    An inverter coupled to the low pass filter for receiving a low passed envelope modulated signal from the low pass filter; and

    A transducer or amplifier coupled to the inverter and the low pass filter for receiving an inverted low passed signal and the low passed envelope modulated signal.

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