2014/10/15 下午 10:11:23

iphone Programming Glossary: meter

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

get a volume measurement of iPhone recording in dB with a limit of at least 120dB I am trying to make a simple volume meter for the iPhone. I want the volume to be displayed in dB. When using this turorial I am only getting measurements up to 78..

How to integrate NSURLConnection with UIProgressView?

http://stackoverflow.com/questions/312796/how-to-integrate-nsurlconnection-with-uiprogressview

Getting exposure values from camera on iPhone OS 4.0

http://stackoverflow.com/questions/3172116/getting-exposure-values-from-camera-on-iphone-os-4-0

OS 4.0 Exposure values from camera can be acquired when you take picture without saving it to SavedPhotos . A light meter application on iPhone does this probably by using some private API. That application does it on iPhone 3GS only so I guess..

An -observeValueForKeyPath:ofObject:change:context: message was received but not handled

http://stackoverflow.com/questions/4120539/an-observevalueforkeypathofobjectchangecontext-message-was-received-but-not

All that is happening to trigger this is self measurementPointer setMeasurementDescriptor descriptor Given this meterDisplay measurementPointer addObserver self forKeyPath @ measurementDescriptor options NSKeyValueObservingOptionNew context.. Such a change might cause a graph display's axis to change for example. Or in the code above might cause a meter display to show a different sample from a selected set of samples . I think that fundamental problem is that a CGImage is..

Zoom to fit region for all annotations - ending up zooming in between annotations

http://stackoverflow.com/questions/4523604/zoom-to-fit-region-for-all-annotations-ending-up-zooming-in-between-annotation

locNorthEast CLLocation alloc initWithLatitude NorthEast.latitude longitude NorthEast.longitude CLLocationDistance meter locSouthWest distanceFromLocation locNorthEast MKCoordinateRegion region region.span.latitudeDelta meter 111319.5 region.span.longitudeDelta.. meter locSouthWest distanceFromLocation locNorthEast MKCoordinateRegion region region.span.latitudeDelta meter 111319.5 region.span.longitudeDelta 0.0 region.center.latitude SouthWest.latitude NorthEast.latitude 2.0 region.center.longitude..

another question about recording, modifying and playing audio on iphone

http://stackoverflow.com/questions/5137853/another-question-about-recording-modifying-and-playing-audio-on-iphone

peak and RMS values and understanding how to integrate an RMS value over a given time say 300ms which is what a VU meter uses . Basically you sum all the squares of the values. You would take the square root and convert to dBFS with 10 log10f.. as pseudo code Example class VUMeter protected samples per second float _sampleRate the integration time in seconds vu meter is 300ms float _integrationTime these maintain a circular buffer which contains the 'squares' of the audio samples int _integrationBufferLength..

How to measure noise or sound and displays in dB(A) in iphone?

http://stackoverflow.com/questions/6183599/how-to-measure-noise-or-sound-and-displays-in-dba-in-iphone

I want to measure sound in dB A in iPhone. How can I do it Is there any example or tutorial iphone objective c audio meter share improve this question If you use AVAudioPlayer you can use this method AVAudioPlayer avPlayer ... avPlayer play.....

What is the range of bluetooth and is it strictly 1:1?

http://stackoverflow.com/questions/658899/what-is-the-range-of-bluetooth-and-is-it-strictly-11

experience iphone bluetooth share improve this question Just answering the range part of your question... The 10 meter figure for class 2 devices of which the iPhone is an example is very much a guideline. The range of a Bluetooth device is.. of packet loss in practice you can hear this in the audio being carried . So in this case the range is about one meter. At the opposite extreme two class 2 devices separated by nothing more than clear air can get ranges of hundreds of meters... At the opposite extreme two class 2 devices separated by nothing more than clear air can get ranges of hundreds of meters. Other factors that influence things are Interference Lots of things use 2.4 GHz. WiFi for example can cause problems...

Why is Geolocation in Mobile Safari way less accurate than the location in a native App?

http://stackoverflow.com/questions/6790368/why-is-geolocation-in-mobile-safari-way-less-accurate-than-the-location-in-a-nat

see an example here http jsbin.com uyoyey The accuracy which you can see in each line after the pipe is around 3000 meters when I'm testing outside . Which is quite bad obviously. The native Maps App on my iPhone is way more precise. Approximately.. 2.2 iOS4 and iOS5. On both android browser and iOS 4 Safari I'm getting GPS accuracy level in magnitude of 1000 meters. But on iOS 5 Safari I'm able to get down to 5 meter accuracy. Seems GPS has improved on iOS 5 but it is just a small slice.. iOS 4 Safari I'm getting GPS accuracy level in magnitude of 1000 meters. But on iOS 5 Safari I'm able to get down to 5 meter accuracy. Seems GPS has improved on iOS 5 but it is just a small slice of the market out there. Overall it is still not..

Time based GPS location in background (iphone)

http://stackoverflow.com/questions/7560154/time-based-gps-location-in-background-iphone

some functionality to run in the background like location music and VOIP. I need the GPS to be accurate on the meter. Can someone help me with a small example iphone objective c ios gps background process share improve this question ..

Alternative to global variables in app delegate

http://stackoverflow.com/questions/7635008/alternative-to-global-variables-in-app-delegate

to global variables in app delegate I am developing an application with a speedometer like animation a meter and an arrow to indicate something on the meter . I store the arrow's position in a global variable.. to global variables in app delegate I am developing an application with a speedometer like animation a meter and an arrow to indicate something on the meter . I store the arrow's position in a global variable declared in my app delegate... I am developing an application with a speedometer like animation a meter and an arrow to indicate something on the meter . I store the arrow's position in a global variable declared in my app delegate. I am doing it this way because the arrow..