2014/10/15 下午 10:04:51

iphone Programming Glossary: calibrate

http://stackoverflow.com/questions/10921395/using-accelerometer-to-calculate-speeds

solve the problem however I'm not sure if the accelerometer data will be rendered useless because of not being able to calibrate it and also the noise seen from vibrations may be too great to use the data... Has anyone tried or used these types of methods..

Bluetooth LE RSSI for proximity detection iOS

http://stackoverflow.com/questions/15687332/bluetooth-le-rssi-for-proximity-detection-ios

of Matthew Griffin matches mine. However when we can measure for a fair period of time two things have helped us calibrate this better. We did have to wrap a simple kalman filter on the antenna orientation and the IMU to get a rough running commentary.. much rotated. And in practice once needs some 4 5 'other' devices ideally not too mobile to keep oneself dynamically calibrated. However the converse is quite reliable i.e. we know when not to measure. And the net result is that one can fairly well..

How to get a volume measurement of iPhone recording in dB, with a limit of at least 120dB

http://stackoverflow.com/questions/2548238/how-to-get-a-volume-measurement-of-iphone-recording-in-db-with-a-limit-of-at-le

and dB SPL which is an absolute measurement of sound pressure level . To measure dB SPL though you will need to calibrate your microphone and audio hardware with some kind of reference. Once you have your input calibrated then it may well be.. you will need to calibrate your microphone and audio hardware with some kind of reference. Once you have your input calibrated then it may well be that your 96 dB of dynamic range translates to an absolute range of say 44 dB SPL to 140 dB SPL . See..

Compensating compass lag with the gyroscope on iPhone 4

http://stackoverflow.com/questions/4212988/compensating-compass-lag-with-the-gyroscope-on-iphone-4

on the purpose or which side is your reference. the other thing is gyro is fast but its not stable you need to re calibrate the value for several interval. In my case every 5 second. I've experiment with gyro for calculating angle between two plane.. XYZ Xg Yg Zg Check if Xg 0.25 If TRUE try Yg then Zg Note 1 1g 9.82 m s^2 Read the compass and gyro Configure and calibrate the gyro using the compass and calulate based on which axis i use in point 3. If 5 second is pass then recalibrate read.. and calibrate the gyro using the compass and calulate based on which axis i use in point 3. If 5 second is pass then recalibrate read the compass If the the difference with gyro reading is 5 degree skip recalibartion the gyro. If the the difference..