改变音调（非实时）
我心里一直有这个问题，但无论我问什么，我都无法得到有用的答案或建议：
我怎样才能发出声音（不是实时的）？
我使用 AVFoundation 框架来播放我的声音，如下所示：
AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:TempRecFile error:nil];
player.volume = 1;
[player play];
How can i set theitch or the rates of my sound without using some othere Frameworks like OpenAL.不过，如果您知道我可以在哪里学习 OpenAl，我们非常欢迎您：D
i alway had this question in my mind, but wherever i asked, i could never get an answer or a suggestion that would be helpful:
How can i pitch a sound (not realtime) ?
Im using AVFoundation framework to play my sounds like so:
AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:TempRecFile error:nil];
player.volume = 1;
[player play];
How can i set the pitch or the frequency of my sound without having to use some othere frameworks like OpenAL. Although, if you know a place where i could learn some OpenAl you're very welcome :D
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有一些 iPhone 时间音调转换库提到了这个 StackOverflow 答案：Real- iPhone 上的时间变调，
可以离线工作，也可以实时工作。
这里有一篇关于时间音调技术的维基百科文章，以及有关该主题的 dspdimention 概述。
There are a few iPhone time-pitch shifting libraries mentioned the this StackOverflow answer: Real-time Pitch Shifting on the iPhone,
which work offline as well as potentially in real-time.
Here's a wikipedia article on time-pitch technology, and a dspdimention overview on the topic.