Re: How to add an EQ Filter in Coreaudio/AVAudioPlayer??
Re: How to add an EQ Filter in Coreaudio/AVAudioPlayer??
- Subject: Re: How to add an EQ Filter in Coreaudio/AVAudioPlayer??
- From: Kevin Dixon <email@hidden>
- Date: Wed, 13 Oct 2010 10:46:55 -0700
You may want to use the system-supplied AUFilter. Though the doc says they are available in 10.5, it is the iOS documentation, maybe someone can verify its available on the iPhone
http://developer.apple.com/library/ios/#documentation/MusicAudio/Conceptual/CoreAudioOverview/SystemAudioUnits/SystemAudioUnits.html
If you want to go further, you could write your own AudioUnit and implement the algorithms here
http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt -- this was a great learning experience for me when I was starting out in DSP.
Hope that helps,
Kevin
On Tue, Oct 12, 2010 at 7:59 AM, cocell
<email@hidden> wrote:
I'm trying to import an audio file than change it's frequency while playing. I've seen many programs with this but I can't figure out how to grab the samples out of the buffer and rewrite it with a different frequency, like boost 12dBs @ 100Hz with an UISlider for the iPhone. I understand how to import the audio and add the slider, but don't know where in my code to add the filter equation...
How can I add this equation,
![$\displaystyle y(n) = x(n) + x(n - 1) \protect$]()
into my implementation. Plz Help.
It's been 4-5 months of studying DSP but now I Have to fiqure out how to get the samples into the equation
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