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2014/10/15 ¤U¤È 10:14:20

iphone Programming Glossary: spectrum

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

in dB. When using this turorial I am only getting measurements up to 78 dB. I've read that that is because the dBFS spectrum for 16 bit audio recordings is only 96 dB. I tried modifying this piece of code in the init function dataFormat.mSampleRate..

What do the colors and percentages mean in the Leaks Instrument?

http://stackoverflow.com/questions/4283296/what-do-the-colors-and-percentages-mean-in-the-leaks-instrument

of the histogrambar changes. Blue histogrambars represent a reasonable ratio while colors shifted towards the red spectrum represent lower ratios that might warrant some investigation Regarding your question no. 2 The Leaks instrument examines..

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

missing or very weak fundamental common in some voice piano and guitar sounds and or lots of powerful overtones in its spectrum. Look at a wide band spectrum or spectrograph of your musical sounds and you will see the problem. Other methods are usually.. common in some voice piano and guitar sounds and or lots of powerful overtones in its spectrum. Look at a wide band spectrum or spectrograph of your musical sounds and you will see the problem. Other methods are usually needed for a more reliable.. of musical pitch. Some of these include autocorrelation methods AMDF ASDF Cepstrum Cepstral analysis harmonic product spectrum phase vocoder and or composite algorithms such as RAPT Robust Algorithm for Pitch Tracking and YAAPT. An FFT is useful as..

Weird colors in XCode Interface Builder?

http://stackoverflow.com/questions/7488378/weird-colors-in-xcode-interface-builder

clicking the Sliders tab then clicking the little dropdown button under the magnifying glass that looks like a color spectrum. This will bring up a list of available color spaces select Generic RGB and adjust the sliders as necessary to get the correct..