Here is code from Reto Meier's book:
*List < Sensor > gyroscopes = sensorManager.getSensorList( Sensor.TYPE_GYROSCOPE);* *if (gyroscopes != null && gyroscopes.size() > 1) correctedGyro = gyroscopes.get( gyroscopes.size()-1);* He is getting the last gyroscope sensor and names the variable "* correctedGyro*". He works for Google. Since he named the variable "correctedGyro" I would guess it's "corrected". Meier, Reto (2012-04-05). Professional Android 4 Application Development (Wrox Professional Guides) (Kindle Location 12820). John Wiley and Sons. Kindle Edition. On Wednesday, February 13, 2013 4:16:35 AM UTC-6, Marta Ribeiro wrote: > > Yes, I've been reading about that. > > But my question was if the values I get directly from the gyroscope, > without applying filters of my own, could have some kind of filter > (inherent to the sensor) as the values do not present standard deviation, > which would be "impossible" without some kind of filter. > > On Tuesday, February 12, 2013 8:14:12 PM UTC, Tux wrote: >> >> It is not impossible but it's complicate to implement the filters. >> A simple low pass filter is not enough. To do it right you need to >> combine accelerator and gyroscope data. For this purpose you could >> implement a complementary or Kalman filter. You find some examples on >> the net. Or google for "sensorfusion". >> >> 2013/2/12 Marta Ribeiro <[email protected]>: >> > Well yes that's my doubt, if you say "gyroscope noise and drift will >> > introduce errors that need to be compensated for." and i'm not applying >> any >> > filter of my own, i'm just examining the data directly from >> sensor.event and >> > they seem not to have any noise or bias, it seems a bit impossible if >> the >> > tablet does not have some kinf of filter embedded. >> > >> > I'm I on the right path here? >> > >> > And thank you for your answer! >> > >> > >> > On Monday, February 11, 2013 6:39:02 PM UTC, Tux wrote: >> >> >> >> Hi, >> >> >> >> your measurement are as expected. The gyroscope measures the rate or >> >> rotation in rad/s and in stationary state the turn rate is about Zero. >> >> >> >> >> >> >> http://developer.android.com/guide/topics/sensors/sensors_motion.html#sensors-motion-gyro >> >> >> >> >> "Standard gyroscopes provide raw rotational data without any filtering >> >> or correction for noise and drift (bias). In practice, gyroscope noise >> >> and drift will introduce errors that need to be compensated for. You >> >> usually determine the drift (bias) and noise by monitoring other >> >> sensors, such as the gravity sensor or accelerometer." >> >> >> >> >> >> >> >> 2013/2/11 Marta Ribeiro <[email protected]>: >> >> > Hi! >> >> > >> >> > I'm doing a project, and it requires me to analyse the reliability >> of a >> >> > tablet's sensors. >> >> > >> >> > I have analysed the gyroscope data when the tablet is stationary, >> and >> >> > the >> >> > results are an average of -5.3263 *10^{-7} and a standard deviation >> >> > equal to >> >> > 0. >> >> > >> >> > Now this leads me to believe that this sensor has some kind of >> filter >> >> > embedded already, although I can't seem to find any information >> about >> >> > it. >> >> > >> >> > I appreciate any kind of information regarding this results. >> >> > >> >> > Thanks in advance! >> >> > >> >> > -- >> >> > -- >> >> > You received this message because you are subscribed to the Google >> >> > Groups "Android Developers" group. >> >> > To post to this group, send email to [email protected] >> >> > To unsubscribe from this group, send email to >> >> > [email protected] >> >> > For more options, visit this group at >> >> > http://groups.google.com/group/android-developers?hl=en >> >> > --- >> >> > You received this message because you are subscribed to the Google >> >> > Groups >> >> > "Android Developers" group. >> >> > To unsubscribe from this group and stop receiving emails from it, >> send >> >> > an >> >> > email to [email protected]. >> >> > For more options, visit https://groups.google.com/groups/opt_out. >> >> > >> >> > >> > >> > -- >> > -- >> > You received this message because you are subscribed to the Google >> > Groups "Android Developers" group. >> > To post to this group, send email to [email protected] >> > To unsubscribe from this group, send email to >> > [email protected] >> > For more options, visit this group at >> > http://groups.google.com/group/android-developers?hl=en >> > --- >> > You received this message because you are subscribed to the Google >> Groups >> > "Android Developers" group. >> > To unsubscribe from this group and stop receiving emails from it, send >> an >> > email to [email protected]. >> > For more options, visit https://groups.google.com/groups/opt_out. >> > >> > >> > -- -- You received this message because you are subscribed to the Google Groups "Android Developers" group. 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