{"action":"closed","issue":{"url":"https://api.github.com/repos/audiokit/AudioKit/issues/354","repository_url":"https://api.github.com/repos/audiokit/AudioKit","labels_url":"https://api.github.com/repos/audiokit/AudioKit/issues/354/labels{/name}","comments_url":"https://api.github.com/repos/audiokit/AudioKit/issues/354/comments","events_url":"https://api.github.com/repos/audiokit/AudioKit/issues/354/events","html_url":"https://github.com/audiokit/AudioKit/issues/354","id":149775268,"number":354,"title":"Analyse High frequencies Audio","user":{"login":"remirobert","id":3276768,"avatar_url":"https://avatars.githubusercontent.com/u/3276768?v=3","gravatar_id":"","url":"https://api.github.com/users/remirobert","html_url":"https://github.com/remirobert","followers_url":"https://api.github.com/users/remirobert/followers","following_url":"https://api.github.com/users/remirobert/following{/other_user}","gists_url":"https://api.github.com/users/remirobert/gists{/gist_id}","starred_url":"https://api.github.com/users/remirobert/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/remirobert/subscriptions","organizations_url":"https://api.github.com/users/remirobert/orgs","repos_url":"https://api.github.com/users/remirobert/repos","events_url":"https://api.github.com/users/remirobert/events{/privacy}","received_events_url":"https://api.github.com/users/remirobert/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":1,"created_at":"2016-04-20T13:56:58Z","updated_at":"2016-04-20T17:36:43Z","closed_at":"2016-04-20T17:36:43Z","body":"I am writing an application, which will be able to analyse the sound from the micro, but only the frequencies above 13000 Khz.\r\n\r\n- To try the high frequency sound, I am using this tool : http://onlinetonegenerator.com\r\n\r\nThis is the code I am using : \r\n\r\n```swift\r\nlet mixer = AKMixer(mic)\r\nlet highPassFilter = AKHighPassFilter(mic)\r\n\r\ntracker = AKFrequencyTracker(highPassFilter, minimumFrequency: 13000, maximumFrequency: 20000)\r\nhighPassFilter.play()\r\nAudioKit.output = tracker\r\nAudioKit.start()\r\n        \r\nhighPassFilter.start()\r\n        \r\nlet _ = Loop(every: 1 / 1000) {\r\n  let freq = self.tracker.frequency\r\n  print(freq)\r\n}\r\n```\r\n\r\nI don't display the right frequencies on the loop.\r\nDo I have to use FFT to analyse my current frequency ?\r\n\r\nI am totally new in the sound analyse, and first time using this framework.\r\n\r\nThanks in advance for you help."}}