I am creating a voice recording app wherein I have displayed a decibel meter. However, I would like to include a voice spectrogram on the lines of what is found in Dragon Dictate or Google Search applications.
Any suggestions on where I can start in this regard. I am a complete dummy when it comes to FFT or spectrogram analysis.
Look forward to any suggestions.
Apple's aurioTouch sample app (in the iOS Dev Center at developer.apple.com) includes example source code for doing an FFT and displaying a spectrogram from microphone input. Even better is using the much faster FFT in the newer iOS Accelerate framework.