{"action":"created","issue":{"url":"https://api.github.com/repos/kfrlib/kfr/issues/5","repository_url":"https://api.github.com/repos/kfrlib/kfr","labels_url":"https://api.github.com/repos/kfrlib/kfr/issues/5/labels{/name}","comments_url":"https://api.github.com/repos/kfrlib/kfr/issues/5/comments","events_url":"https://api.github.com/repos/kfrlib/kfr/issues/5/events","html_url":"https://github.com/kfrlib/kfr/issues/5","id":188479947,"number":5,"title":"Documentation: what is the amplitude of the fft real complex?","user":{"login":"abique","id":31200,"avatar_url":"https://avatars.githubusercontent.com/u/31200?v=3","gravatar_id":"","url":"https://api.github.com/users/abique","html_url":"https://github.com/abique","followers_url":"https://api.github.com/users/abique/followers","following_url":"https://api.github.com/users/abique/following{/other_user}","gists_url":"https://api.github.com/users/abique/gists{/gist_id}","starred_url":"https://api.github.com/users/abique/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/abique/subscriptions","organizations_url":"https://api.github.com/users/abique/orgs","repos_url":"https://api.github.com/users/abique/repos","events_url":"https://api.github.com/users/abique/events{/privacy}","received_events_url":"https://api.github.com/users/abique/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":5,"created_at":"2016-11-10T11:06:57Z","updated_at":"2016-11-11T18:03:33Z","closed_at":null,"body":"Hi,\r\n\r\nI wonder what is computed exactly, because I get much lower volume than FFTReal or KissFFT.\r\n\r\nDo you already divide the elements by 1/N?\r\n\r\nRegards,\r\nAlex."},"comment":{"url":"https://api.github.com/repos/kfrlib/kfr/issues/comments/260017403","html_url":"https://github.com/kfrlib/kfr/issues/5#issuecomment-260017403","issue_url":"https://api.github.com/repos/kfrlib/kfr/issues/5","id":260017403,"user":{"login":"dlevin256","id":20210737,"avatar_url":"https://avatars.githubusercontent.com/u/20210737?v=3","gravatar_id":"","url":"https://api.github.com/users/dlevin256","html_url":"https://github.com/dlevin256","followers_url":"https://api.github.com/users/dlevin256/followers","following_url":"https://api.github.com/users/dlevin256/following{/other_user}","gists_url":"https://api.github.com/users/dlevin256/gists{/gist_id}","starred_url":"https://api.github.com/users/dlevin256/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dlevin256/subscriptions","organizations_url":"https://api.github.com/users/dlevin256/orgs","repos_url":"https://api.github.com/users/dlevin256/repos","events_url":"https://api.github.com/users/dlevin256/events{/privacy}","received_events_url":"https://api.github.com/users/dlevin256/received_events","type":"User","site_admin":false},"created_at":"2016-11-11T18:03:33Z","updated_at":"2016-11-11T18:03:33Z","body":"As for the algorithm itself, real FFT is used for FFT convolution and is certainly tested in KFR.\r\n\r\nKFR doesn't perform a division as part of the inverse FFT.\r\n\r\nHow do you obtain that results?\r\nIn order to check it all, please provide the minimal code that reproduces your result.\r\nAlso, provide the code where you call FFTReal and KissFFT for comparison.\r\n\r\nDid you get lower volume after forward FFT or after backward FFT?\r\n\r\nAnd run the above code snippet and check that the result is (512, 0)."}}
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