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2014/10/15 ¤U¤È 10:12:32
iphone Programming Glossary: peakhttp://stackoverflow.com/questions/11173605/detecting-a-clap-in-ios Here is my attempt void levelTimerCallback NSTimer timer recorder updateMeters const double ALPHA 0.05 double peakPowerForChannel pow 10 0.05 recorder peakPowerForChannel 0 lowPassResults ALPHA peakPowerForChannel 1.0 ALPHA lowPassResults.. NSTimer timer recorder updateMeters const double ALPHA 0.05 double peakPowerForChannel pow 10 0.05 recorder peakPowerForChannel 0 lowPassResults ALPHA peakPowerForChannel 1.0 ALPHA lowPassResults if recorder peakPowerForChannel 0 0 totalClapsLabel.text.. const double ALPHA 0.05 double peakPowerForChannel pow 10 0.05 recorder peakPowerForChannel 0 lowPassResults ALPHA peakPowerForChannel 1.0 ALPHA lowPassResults if recorder peakPowerForChannel 0 0 totalClapsLabel.text NSString stringWithFormat..
http://stackoverflow.com/questions/12067802/modal-box-on-iphone-no-scroll uneditable input 22 Aug 2012 9 45AM span div div div class control group label class control label for reading peak Peak label div class controls input style letter spacing 10px type text id reading peak class input medium div div div.. control label for reading peak Peak label div class controls input style letter spacing 10px type text id reading peak class input medium div div div class control group label class control label for reading off peak Off Peak label div.. text id reading peak class input medium div div div class control group label class control label for reading off peak Off Peak label div class controls input style letter spacing 10px type text id reading off peak class input medium div..
AurioTouch & FFT for an instrument tuner http://stackoverflow.com/questions/1447059/auriotouch-fft-for-an-instrument-tuner graph. I play a single note on an instrument and I don't see a nicely ordered small set of frequencies with one string peak at the appropriate frequency of the note. Has anyone used aurioTouch enough to know whether the underlying code is functional..
http://stackoverflow.com/questions/2110009/iphone-audio-analysis .mPeakPower free levels This works because one channel always has an mAveragePower of 0. return channelAvg You can get peak power in either dB Free Scale with kAudioQueueProperty_CurrentLevelMeterDB or simply as a float in the interval 0.0 1.0..
How much memory can an iPhone app use? http://stackoverflow.com/questions/2299750/how-much-memory-can-an-iphone-app-use a lot. When you're programming keep an eye on the increase of memory due to not properly deallocating objects and the peak memory. This problem is more about real world testing on as many devices as possible and good programming practices. Here's..
App Crashing when using large images on iOS 4.0 http://stackoverflow.com/questions/3679457/app-crashing-when-using-large-images-on-ios-4-0 after I leave the view just fine. But the memory usage is still very high. Here is a screenshot of Instruments. First peak is a video I show at startup then the tableview shows a lot of images until then no problems. When I enter a 1 1mb 2576..
Audio Processing: Playing with volume level http://stackoverflow.com/questions/3982723/audio-processing-playing-with-volume-level level I want to read a sound file from application bundle copy it play with its maximum volume level Gain value or peak power I'm not sure about the technical name of it and then write it as another file to the bundle again. I did the copying..
UILabel touch and get the text where touched http://stackoverflow.com/questions/4373053/uilabel-touch-and-get-the-text-where-touched touched I've UILabel which has some text and 2 month names like In the month of January and July sun shine will be peak I sub classed UILabel and added touch event to it. Now I want to get the word below the text where user touched and find..
Drawing waveform with AVAssetReader http://stackoverflow.com/questions/5032775/drawing-waveform-with-avassetreader really don't understand what I gonna do with this CMSampleBufferRef to get data for drawing waveform I need info about peak values how I can get it this maybe another way AVAssetTrack songTrack audioUrl.tracks objectAtIndex 0 AVAssetReaderTrackOutput..
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 IO audio unit. The concept of 'volume' is pretty vague. You might want to look at the difference between calculating 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..
What is the advantage of using Reachability? http://stackoverflow.com/questions/7178330/what-is-the-advantage-of-using-reachability that my answer hadn't considered i.e. MiFi hotspots and makes a valid case that Reachability isn't necessarily the peak of coding heaven it code be. In many cases developers will modify Reachability with their own improvements and the like...
FFT on iPhone to ignore background noise and find lower pitches http://stackoverflow.com/questions/7181630/fft-on-iphone-to-ignore-background-noise-and-find-lower-pitches signal processing fft pitch tracking accelerate framework share improve this question Pitch is not the same as peak magnitude frequency bin which is what the FFT in the Accelerate framework might give you directly . So any peak frequency.. as peak magnitude frequency bin which is what the FFT in the Accelerate framework might give you directly . So any peak frequency detector will not be reliable for pitch estimation. A low pass filter will not help when the note has a missing..
What are the advantages and disadvantages of using ARC? [closed] http://stackoverflow.com/questions/7888568/what-are-the-advantages-and-disadvantages-of-using-arc e.g. a typical amount of autoreleases switching to ARC could really improve your program's execution times and peak memory usage. Can you choose not to use ARC when developing with the iOS 5.0 SDK Yes using CLANG_ENABLE_OBJC_ARC. ARC is..
rendering a waveform on an iphone http://stackoverflow.com/questions/896194/rendering-a-waveform-on-an-iphone more data available in an audio file than pixels on the screen. Most audio editors build a separate file called a peak file or overview file which stores a subset of the audio data usually the peaks and valleys of a waveform for use at different.. editors build a separate file called a peak file or overview file which stores a subset of the audio data usually the peaks and valleys of a waveform for use at different zoom levels. Then as you zoom in past a certain point you start referencing..
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