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I'm trying to access sound volume data from the microphone in realtime. I've tried AVAudioPlayer but it only monitors sounds from a source like an mp3 and not from a microphone. I've also tried The SpeakHere app but it's proving to be much tougher to understand with all the Objective C++ syntax (i'm a newbie). Is there another class similiar to the one in SpeakHere but written only in Objective C?

picciano
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Manny
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2 Answers2

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sc_listener is deprecated. The correct answer today is to use AVAudioRecorder. This tutorial explains how to use it.

Bhargav Rao
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Erik B
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Erik's answer is correct. Here is a reusable implementation using this method as a recognizer/delegate.

https://github.com/picciano/iOS-Audio-Recoginzer

picciano
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    can we get the decibel(dB SPL) value of microphone, with your project? – brush51 Jun 12 '13 at 07:56
  • It includes the power levels, but I've read too many conflicting theories on exactly how to calculate the dB levels. I choose to leave that exercise to the reader. :) – picciano Jun 14 '13 at 01:18
  • Can [AVAudioSession](https://developer.apple.com/library/ios/documentation/AudioVideo/Conceptual/AVFoundationPG/Articles/04_MediaCapture.html#//apple_ref/doc/uid/TP40010188-CH5-SW42) – madLokesh Feb 05 '14 at 11:58