dear aaron thank you umashankar
i have published my poems. read (or buy) at http://stores.lulu.com/umashankar > Date: Sat, 26 May 2012 14:09:28 -0700 > From: [email protected] > To: [email protected] > Subject: Re: [Sursound] microphone epiphany ? > > One set of gains that works is > > 0.2357 0.2357 0.2357 0.2357 0.2357 0.2357 > 1.0000 -1.0000 0.0000 0.0000 0.0000 0.0000 > 0.0000 0.0000 1.0000 -1.0000 0.0000 0.0000 > 0 0 0 0 1.0000 -1.0000 > > I put a write up on how to derive those at: > > http://www.ai.sri.com/ajh/ambisonics/umashankar_velan.html > > -- > Aaron ([email protected]) > Menlo Park, CA US > > > On Sat, May 26, 2012 at 12:41 PM, umashankar mantravadi > <[email protected]> wrote: > > > > assuming all six capsules have same gain, and all are contributing to W, > > how much should be the attenuation? umashankar > > > > i have published my poems. read (or buy) at > > http://stores.lulu.com/umashankar > > > Date: Sat, 26 May 2012 18:25:04 +0200 > >> From: [email protected] > >> To: [email protected] > >> Subject: Re: [Sursound] microphone epiphany ? > >> > >> On 05/26/2012 04:51 PM, Augustine Leudar wrote: > >> >> Hi Michael, > >> >> thanks for the reply - there is no doubt Ive missed something ! > >> >> I am aware of the need for W coordinate and have included it in my > >> >> encoder > >> >> as instructed although I have to admit I am still not clear on its > >> >> function - but my question specifically relates to the information > >> >> gained > >> >> from the 3 fig of eight patterns gained form a mic design such as this > >> >> one : > >> >> > >> >> http://www.shapeways.com/model/143678/velan-140-internals.html > >> >> > >> >> Am I right in thinking the W component gives you enhanced distance > >> >> information for a given sound source ? > >> > >> we cannot hear absolute phase, so if you are listening to a figure of > >> eight microphone, there is no way to tell whether the sound you're > >> hearing was coming into the (positive) frontal lobe or the (inverted) > >> rear lobe. hence, the only information we can get from a lonely fig8 is > >> "it's obviously not coming from the side". > >> > >> now if you add an omni to the equation, all of a sudden you have the > >> possibilty to discern between the two lobes of the fig8: one is in-phase > >> with the omni, the other isn't. > >> > >> thus, the 0th order component helps you resolve the ambiguities of all > >> the 1st order signals. > >> > >> btw, if you move to second order, the situation is the same: with a > >> cloverleaf directivity, you only know "it's either coming from > >> front-or-back, or from left-or-right". only with the first-order > >> information, the ambiguity can be resolved. > >> > >> W also has a subtle role in distance coding, but its main job is really > >> to help us make sense of the fig8s. > >> > >> > >> to wrap up, three real fig8s won't ever give you ambisonics. but if you > >> obtain the fig8s by subtracting two back-to-back cardioids, you can also > >> add them, which then gives you a nice omnidirectional component. note > >> that you will have to attenuate the resulting omni signal according to > >> the number of capsules you used. > >> > >> > >> best, > >> > >> > >> jörn > >> > >> > >> > >> -- > >> Jörn Nettingsmeier > >> Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487 > >> > >> Meister für Veranstaltungstechnik (Bühne/Studio) > >> Tonmeister VDT > >> > >> http://stackingdwarves.net > >> > >> _______________________________________________ > >> Sursound mailing list > >> [email protected] > >> https://mail.music.vt.edu/mailman/listinfo/sursound > > > > -------------- next part -------------- > > An HTML attachment was scrubbed... > > URL: > > <https://mail.music.vt.edu/mailman/private/sursound/attachments/20120527/db077b8f/attachment.html> > > _______________________________________________ > > Sursound mailing list > > [email protected] > > https://mail.music.vt.edu/mailman/listinfo/sursound > _______________________________________________ > Sursound mailing list > [email protected] > https://mail.music.vt.edu/mailman/listinfo/sursound -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20120528/a87d2ddb/attachment.html> _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
