iphoneobjective-caudiometer

How to measure noise or sound and displays in dB(A) in iphone?

I want to measure sound in dB(A) in iPhone.

How can I do it?

Is there any example or tutorial?

Solution

  • If you use AVAudioPlayer, you can use this method

    AVAudioPlayer *avPlayer = ...
[avPlayer play...];
[avPlayer averagePowerForChannel:0];
[avPlayer averagePowerForChannel:1];

    From Apple's doc

    - (float)averagePowerForChannel:(NSUInteger)channelNumber

    Description
    Returns the average power for a given channel, in decibels, for the sound being played.