Implement pitch detector class #58

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1. kevinstadler commented on Jul 30, 2020

   

   kevinstadler

   on Jul 30, 2020

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   Currently there are only two built-in types of analysis available in the Sound library: Amplitude for 'loudness', and FFT for frequency spectrum analysis. You can derive more complex audio features like 'tempo' or 'key/pitch' from amplitude and FFT, but that's actually quite a complex task.

   All analysis classes in the Sound library work in the same way: you choose which sound you want to analyse by calling:

   analysisObject.input(soundObject);
   

   So the example above analyses the amplitude of the sound coming out of an AudioIn object, i.e. the microphone or line-in. If you want to analyse the amplitude of a file that's being played back instead just use the following lines during setup():

   SoundFile file = new SoundFile(this, .....);
   file.play();
   Amplitude amp = new Amplitude(this);
   amp.input(file);
   

   There's not a lot of user traffic over here on Github normally, if you have more questions or need coding help it's probably best to ask them over here at the Processing Discourse board: https://discourse.processing.org/c/processing/processing-libraries/19

   👍React with 👍1Reacted by Joe23232
2. Joe23232 commented on Jul 30, 2020

   

   Joe23232

   on Jul 30, 2020

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   THanks for your help :)
3. Joe23232 commented on Jul 30, 2020

   

   Joe23232

   on Jul 30, 2020

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   I did ask the community this but they didn't know the answer.

   So in regards to tempo, how would I specifically get it if you happen to know?
4. kevinstadler

   added

   questionQuestion about setting up or using the libraryQuestion about setting up or using the library

   on Nov 17, 2020
5. kevinstadler commented on Sep 18, 2023

   

   kevinstadler

   on Sep 18, 2023

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   395a5dc added a BeatDetector class which allows you to detect beats, which is not quite the 'tempo' of a track, but as close as you might get in a non-specialized piece of audio software. The other existing Analyzers are now more well-documented and presented in the new website reference, which means the only thing missing from the picture is a built-in pitch/frequency detection class. This should be pretty straightforward to implement by simply wrapping the JSyn PitchDetector class. It might look something like this:

   public class PitchDetector extends Analyzer {
     private final com.jsyn.unitgen.PitchDetector detector;
     private float minimumConfidence = 0.5;
   
     public PitchDetector(PApplet parent) {
       super(parent);
     }
   
     public PitchDetector(PApplet parent, float minimumConfidence) {
       super(parent);
       this.minimumConfidence = minimumConfidence;
     }
   
     // return the current frequency of the input signal if the confidence is at least as high
     // as this detector's minimumConfidence, 0 otherwise
     float analyze() {
       ...
     }
   
     // return the current frequency of the input signal if the confidence is at least as high
     // as the given minimumConfidence, 0 otherwise
     float analyze(float minimumConfidence) {
       ...
     }
   }
6. kevinstadler

   changed the title [-]Is it possible to get various information about an audio file such as current tempo, loudness, key/pitch etc?[/-] [+]Implement pitch detector class[/+] on Sep 18, 2023
7. kevinstadler

   added

   enhancementNew feature or requestNew feature or request

   and removed

   questionQuestion about setting up or using the libraryQuestion about setting up or using the library

   on Sep 18, 2023
8. kevinstadler

   closed this as completedin 5a796d0on Sep 19, 2023