{"action":"created","issue":{"url":"https://api.github.com/repos/thesofproject/sof/issues/686","repository_url":"https://api.github.com/repos/thesofproject/sof","labels_url":"https://api.github.com/repos/thesofproject/sof/issues/686/labels{/name}","comments_url":"https://api.github.com/repos/thesofproject/sof/issues/686/comments","events_url":"https://api.github.com/repos/thesofproject/sof/issues/686/events","html_url":"https://github.com/thesofproject/sof/issues/686","id":388771467,"node_id":"MDU6SXNzdWUzODg3NzE0Njc=","number":686,"title":"4ch 16-bit DMIC recording for v0.55 has dc at the beginning of 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find the recorded sample here: https://drive.google.com/file/d/1Oz6uWxcdCedkXCkLsj-Z6iCWnx1zL8xE/view?usp=sharing\r\n\r\nRecorded on GLK chromebook"},"comment":{"url":"https://api.github.com/repos/thesofproject/sof/issues/comments/447041606","html_url":"https://github.com/thesofproject/sof/issues/686#issuecomment-447041606","issue_url":"https://api.github.com/repos/thesofproject/sof/issues/686","id":447041606,"node_id":"MDEyOklzc3VlQ29tbWVudDQ0NzA0MTYwNg==","user":{"login":"singalsu","id":28754793,"node_id":"MDQ6VXNlcjI4NzU0Nzkz","avatar_url":"https://avatars0.githubusercontent.com/u/28754793?v=4","gravatar_id":"","url":"https://api.github.com/users/singalsu","html_url":"https://github.com/singalsu","followers_url":"https://api.github.com/users/singalsu/followers","following_url":"https://api.github.com/users/singalsu/following{/other_user}","gists_url":"https://api.github.com/users/singalsu/gists{/gist_id}","starred_url":"https://api.github.com/users/singalsu/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/singalsu/subscriptions","organizations_url":"https://api.github.com/users/singalsu/orgs","repos_url":"https://api.github.com/users/singalsu/repos","events_url":"https://api.github.com/users/singalsu/events{/privacy}","received_events_url":"https://api.github.com/users/singalsu/received_events","type":"User","site_admin":false},"created_at":"2018-12-13T16:54:33Z","updated_at":"2018-12-13T16:54:33Z","author_association":"COLLABORATOR","body":"It looks and sounds quite OK but there's some strange tonal background noise. Is there a fan in the device or is the lab space noisy? Are the click sounds from keyboard typing?\r\n\r\nThere's no DC problems seen, so the this topic can be closed. But if there's no fan and the space where you tested was silent you may want to open another issue about noise. \r\n\r\nGenerally microphones should be tested in silent condition and it would be good if you could in addition playback a chirp / sine sweep from about 100 Hz to 20 kHz via some high quality speaker (maybe a good over-ear headphone very near to microphone can be used too for output) . Audacity can make a chirp waveform via menu Generate -> Chirp."}}
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