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2014/10/15 ¤U¤È 10:09:23
iphone Programming Glossary: frequencyAurioTouch & FFT for an instrument tuner http://stackoverflow.com/questions/1447059/auriotouch-fft-for-an-instrument-tuner tried to comment this code . My worry is that aurioTouch doesn't seem to actually work very well when looking at the frequency domain graph. I play a single note on an instrument and I don't see a nicely ordered small set of frequencies with one string.. 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 or whether it is just a.. or KISS FFT. Anyone have any experience with those Thanks. iphone audio fft share improve this question FFTs use frequency bins and the bin frequency width is based on the FFT parameters. To find a frequency you will need to record it sampled..
Do you know a good and efficient FFT? [closed] http://stackoverflow.com/questions/1592345/do-you-know-a-good-and-efficient-fft I need to run it on the iPhone so it must not be intensive. Instead maybe you know of one that is wavelet like i need frequency resolution but only a narrow band vocal audio range up to 10khz max...even 10Khz might be too high . Im thinking also of.. vocal audio range up to 10khz max...even 10Khz might be too high . Im thinking also of truncating this FFT to keep the frequency resolution while eliminating the unwanted frequency band. This is for an iphone ...I have taken a look at the FFT in Aurio.. be too high . Im thinking also of truncating this FFT to keep the frequency resolution while eliminating the unwanted frequency band. This is for an iphone ...I have taken a look at the FFT in Aurio touch but it seems this is an int FFT but my app..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework and vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD Now A will contain n 2 complex numbers. These represent n 2 frequency bins bin 1 .idealFreq 44Hz ie The lowest frequency we can reliably detect is ONE complete wave within that window ie a 44Hz.. Now A will contain n 2 complex numbers. These represent n 2 frequency bins bin 1 .idealFreq 44Hz ie The lowest frequency we can reliably detect is ONE complete wave within that window ie a 44Hz wave. bin 2 .idealFreq 2 44Hz etc. bin 512 .idealFreq.. complete wave within that window ie a 44Hz wave. bin 2 .idealFreq 2 44Hz etc. bin 512 .idealFreq 512 44Hz The highest frequency we can detect known as the Nyquist frequency is where every pair of points represents a wave ie 512 complete waves within..
Tone Generation in Cocoa Touch http://stackoverflow.com/questions/347250/tone-generation-in-cocoa-touch Generation in Cocoa Touch I need to generate a tone that I can manipulate frequency and wave. The overall goal is to create a basic piano. Does anyone know how I can achieve this My development platform is..
Most efficient way to draw part of an image in iOS http://stackoverflow.com/questions/8035673/most-efficient-way-to-draw-part-of-an-image-in-ios CGImageRelease imageRef Unfortunately this seems extremely slow with medium sized images and a high setNeedsDisplay frequency. Playing with UIImageView 's frame and clipToBounds produces better results with less flexibility . iphone ios uiimage..
http://stackoverflow.com/questions/9359239/code-sign-error-certificate-identity-iphone-developer-my-name-xxx-appears share improve this question Xcode 4.3 now searches all keychains for signing certificates but that is increasing the frequency of the build error Certificate identity x appears more than once in the keychain... Apple's steps to resolve it are here..
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