Example taken from: http://stackoverflow.com/questions/1638864/filtering-accelerometer-data-noise

Android - Filtering accelerometer data noise

var accelFilter = function ( x, y, z ) {
  //ramp-speed - play with this value until satisfied (value is a float number)
  var kFilteringFactor = 0.1,

    //last result storage - keep definition outside of this function, eg. in wrapping object (values are floats)
    accel[3],

    highPassFilter = function () {
      //acceleration.x,.y,.z is the input from the sensor

      //result.x,.y,.z is the filtered result

      //high-pass filter to eliminate gravity
      accel[0] = acceleration.x * kFilteringFactor + accel[0] * (1.0 - kFilteringFactor);
      accel[1] = acceleration.y * kFilteringFactor + accel[1] * (1.0 - kFilteringFactor);
      accel[2] = acceleration.z * kFilteringFactor + accel[2] * (1.0 - kFilteringFactor);
      result.x = acceleration.x - accel[0];
      result.y = acceleration.y - accel[1];
      result.z = acceleration.z - accel[2];
    }
}