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I want to develop a simple iPhone application which can record the external sounds, and measure the sound wave frequency and power in decibels, any ideas about how to do this?

Egy_Medrawi
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The section of the documentation labeled Audio & Video might be a good place to start.

KevinDTimm
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  • I've googled this, but all what I found was talking about recording and saving sound clips into the iphone device, – Egy_Medrawi Dec 01 '10 at 17:59
  • If you can provide me with helpful links, that would be nice of you. – Egy_Medrawi Dec 01 '10 at 17:59
  • At which point you're going to have to open the files and read the 'raw' data which gives you amplitude/frequency/etc. It will require learning about the file format you decide to write the output in. – KevinDTimm Dec 01 '10 at 18:00
  • If you save in MP3 (for example), you'll have to start here: http://en.wikipedia.org/wiki/MP3 – KevinDTimm Dec 01 '10 at 18:02
  • Thanks for your quick response, It's ok to save the file into mp3 format, then how can I read the sound frequency and the sound power in decibels from the audio file, It would be great if you can give me links with technical links to the API I would use. – Egy_Medrawi Dec 01 '10 at 18:10
  • If the answer is wrong, tell me why it's WRONG. If you don't like the answer, answer it yourself. – KevinDTimm Dec 01 '10 at 19:44
  • Saving to a file, especially a compressed one like mp3, is wasteful though workable. You should be able to just fill a memory buffer with some samples and process it. – Chris Stratton Dec 08 '10 at 21:12
  • Downvoted today, yet nobody owns up to why (after 6+ months as the accepted answer). – KevinDTimm Jun 28 '11 at 19:00
  • 3 down votes for an accepted answer - and I can't remove it because it's accepted – KevinDTimm Sep 16 '14 at 12:53