How can I play a sound file with varying pitch in iOS device programmatically

Question

I have a heart beat sound file. I would like to play it on increasing pitch as a user waits for a time interval to finish. Can anyone tell me how to do this in iOS ?

Based on some (very cursory) searching: [have you looked into DIRAC](http://dirac.dspdimension.com/Dirac3_Technology_Home_Page/Dirac3_Technology.html) at all? — admdrew, Aug 28 '14 at 19:41

score 1 · Accepted Answer · edited May 23 '17 at 11:45

1

You may want to see: Real-time Pitch Shifting on the iPhone

That article references dirac3d, but CoreAudio also now has this capability but it's non-trivial to setup. Chris Adamson has written some good articles on CoreAudio that would probably be helpful.

edited May 23 '17 at 11:45

Community

1
1

answered Aug 28 '14 at 19:41

Jack Cox

3,290
24
25

score 1 · Answer 2 · answered Sep 01 '14 at 19:46

1

The current version of iOS includes, built-in, the NewTimePitch Audio Unit, which can be used for increasing the pitch or play time independently.

answered Sep 01 '14 at 19:46

hotpaw2

70,107
14
90
153

How can I play a sound file with varying pitch in iOS device programmatically

2 Answers2