Re: Pitch detection
Re: Pitch detection
- Subject: Re: Pitch detection
- From: Chad Wagner <email@hidden>
- Date: Thu, 02 Apr 2015 15:59:50 -0700
Can you make any assumptions about the type of input you expect? You mentioned a guitar tuner, if you know you will have a single sustained pitch of stable timbre in a constrained range it can be much easier to implement than a generalized algorithm that will work for many different types of inputs.
+1 for YIN.
> On Apr 2, 2015, at 3:49 PM, Paul Davis <email@hidden> wrote:
>
> realtime analysis means that you are limited to processing the audio as it flows through the plugin. you cannot read ahead, or behind, you cannot change the amount of data you receive or the rate at which you receive it. your methods must be realtime safe.
>
> non-realtime analysis means, in practice, that you are given a file or fixed buffer with all the data in it, and you can process it in any order, and chunk sizes you want, using any algorithms you feel like.
>
> On Thu, Apr 2, 2015 at 6:30 PM, Kevin Callahan <email@hidden> wrote:
>
>> On Apr 2, 2015, at 3:22 PM, Paul Davis <email@hidden> wrote:
>>
>> aubio is a common starting point for open source pitch detection, as is the CLAM project. however, my impression is that to do it well, you want non-realtime analysis, which means that normal AU's are not ideal. the VAMP plugin suite is another open source API and set of plugins specifically designed for non-realtime analysis.
>>
>> please don't use these sources if you intend to write proprietary software (though of course, nothing is going to stop you).
>
> When you speak of real-time analysis, would guitar tuners be an example? I’m not making a guitar tuner, but that’s the sort of thing I need to do.
>
>>
>> On Thu, Apr 2, 2015 at 5:30 PM, Kevin Callahan <email@hidden> wrote:
>> I’m writing an iOS app in Swift (will also write a Mac version later) and would like to add pitch detection. Is there an open-source project that does frequency pitch detection? Would I use AVAudioSession to capture the audio, then drop down into CoreAudio to do the pitch detection?
>>
>> In my initial research, I’ve learned there are many algorithms and ways to go about doing pitch detection - each having strengths and weaknesses.
>>
>> Can someone please point me in the best direction to get started?
>>
>> Thanks,
>> -K
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