CODEWITHSUNDEEP
iosobjective-cswiftaudioaudio-recording
user2649189
user2649189

Reputation:

iOS: increase volume of recorded audio

Is it possible to process the audio and increase its base volume?

Please do not suggest to increase .volume property. I am looking for way to increase volume of already recorded audio programmatically and save that audio with big volume level.

I am recording from speaker.

Upvotes: 0

Views: 1127

Answers (1)

Joshua Breeden
Joshua Breeden

Reputation: 1994

There are a couple ways of doing this. Normalization and Compression are the two that come to mind. See the links for better explanations.

  • Audio Normalization - calculate the current loudest sample in the file, and then apply equal gain to every sample such that the loudest sample is now at max volume.

  • Dynamic-range Compression - reduce the gain of a sample or group of samples when they exceed a threshold, and then apply gain to the whole file to compensate for this reduction.

iOS APIs may have a way of doing these already, though I'm not sure. Hopefully this gives you some rope to grab onto.

Upvotes: 2

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