Hi, There are various ways to do it, one is to assume a sound-field model (e.g. direct & diffuse sound), estimate the model parameters in each frequency bin, and then use them to align the signals in a coincident way, such a parametric approach was presented by us in AES Convention in Milan last year for similar applications and higher-order recording.
Another very sensible approach was presented by Cristoff Faller and Illusonics in the same conference, in a simpler adaptive filter is used to align the microphone signals to the phase of one of the capsules, making them again in essence coincident. Parametric approaches for playback and recording (see e.g. DirAC, HARPEX, countless speech enhancement methods) have gone a long way in the last decades in terms of quality and they’re definitely not “snake oil” :-). Best regards, Archontis Politis Post-doctoral Researcher Department of Signal Processing and Acoustics Aalto University Finland On 17 Dec 2018, at 11:39, Dave Hunt <davehuntau...@btinternet.com<mailto:davehuntau...@btinternet.com>> wrote: Hi, There is slightly more description of their A to B-format processing (but not much) in Rode's blog: <http://www.rode.com/blog/all/soundfield-plugin> >From that web page. "The SoundField by RØDE plug-in uses a new time-frequency adaptive approach for A to B-format conversion. This complex mathematical process means the phase between the A-format channels are aligned prior to application of the conversion matrix – essentially correcting for the non-coincidence of the capsules prior to any further processing." How might they phase/time align the capsules ?? This must indeed be highly complex, as it is frequency dependent (low frequencies have smaller phase differences than high frequencies) as well as source directionally (across multiple blind sources) dependent. Ciao, Dave Hunt On 16 Dec 2018, at 17:00, sursound-requ...@music.vt.edu<mailto:sursound-requ...@music.vt.edu> wrote: Send Sursound mailing list submissions to sursound@music.vt.edu<mailto:sursound@music.vt.edu> To subscribe or unsubscribe via the World Wide Web, visit https://mail.music.vt.edu/mailman/listinfo/sursound or, via email, send a message with subject or body 'help' to sursound-requ...@music.vt.edu You can reach the person managing the list at sursound-ow...@music.vt.edu When replying, please edit your Subject line so it is more specific than "Re: Contents of Sursound digest..." WHEN REPLYING EDIT THE SUBJECT LINE ALSO EDIT THE MESSAGE BODY You are receiving the digest so when replying, please remember to edit your Subject line to that of the original message you are replying to, so it is more specific than "Re: Contents of Sursound-list digest…" the subject should match the post you are replying to. Also, please EDIT the quoted post so that it is not the entire digest, but just the post you are replying to - this will keep the archive useful and not polluted with extraneous posts. This is the responsibility of digest subscribers. the community and list subscribers care about the integrity of the threads and archives so this is important.Today's Topics: 1. Re: Soundfield by Rode plugin (Gary Gallagher) From: Gary Gallagher <g.null.dev...@gmail.com> Subject: Re: [Sursound] Soundfield by Rode plugin Date: 16 December 2018 04:36:11 GMT To: Surround Sound discussion group <sursound@music.vt.edu> Thanks for that reference. I guess we'll just have to wait for more information to filter out. On Sun, Dec 16, 2018, 01:36 Paul Hodges <pwh-surro...@cassland.org> wrote: There is slightly more description of their A to B-format processing (but not much) in Rode's blog: <http://www.rode.com/blog/all/soundfield-plugin> Paul -- Paul Hodges _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on. -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20181216/6396613f/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound WHEN REPLYING EDIT THE SUBJECT LINE ALSO EDIT THE MESSAGE BODY _______________________________________________ Sursound mailing list Sursound@music.vt.edu<mailto:Sursound@music.vt.edu> https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on. -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20181217/aaf91ea6/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
