Many thank for that Martin, and although I find the math's a little daunting still, it unfortunately brings even more questions LOL
One is, is it possible to easily implement it using the software a lot of us are using? I've read the circuit diagram of the AD-7 UHJ/B decoder, and the super-stereo function appears to be quite basic, but I believe, very functional, in that 1, The Super-Stereo control equally varies the level of signal to the X & Y phase filters as well as 2, The pre-set mixing of the W, X & Y signals to match the math formulae as described. Has anyone managed to do this in either the software/UHJ response files/Wiggins B-Format decoder (and is it still the best out there) I thought it might be interesting to see if a circuit emulation program could be coaxed into creating a software version of the decoder, any ideas? Sorry for what must be to most some basic questions, and thanks for your tolerance of me here. By the way, if anyone is interested in listening to some Quadraphonic albums decoded in a way unthinkable in the 70's (that is with 360 degree seperation) please do pop by my blog (oh and there are three UHJ decoded albums I've done so far (and phase corrected) - would appreciate some feedback..... http://the-quad-blog.blogspot.com Dave Hunt <davehuntau...@btinternet.com> wrote: > Thanks for finding that. I'll have to dig out the papers and see if I > can find more info, though I remember being hopelessly confused last > time I looked at this, several years back. > > In the meantime I'll carry on just using the straight UHJ to B-Format > equations. These work very well on 'normal' stereo recordings: > instant ambisonic surround. How accurate is impossible to say, > especially as none of these recordings have ever been 'surround', and > the original event is totally inaccessible or even never existed. > > It seems to work best on recordings made with a crossed pair, or even > pan-potted mono. Hardly surprising really. Why not use Super Stereo mode? After all, it was intended for "decoding" stereo recordings. Geoffrey Barton posted the latest (1985) decoding equations for this. This information used to be in the Ambisonia.com Wiki. Until the Wiki is resurrected somewhere, and rather than repeat Geoffrey's post here, I have made it available on my Google Site at: https://sites.google.com/site/mytemporarydownloads/ Look under Ambisonic stuff. As Geoffrey points out, Super Stereo uses the same shelf filters as B-Format, so that should make things easier for you. Regards, Martin -- Martin J Leese E-mail: martin.leese stanfordalumni.org Web: http://members.tripod.com/martin_leese/ _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound ----- No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1325 / Virus Database: 1500/3627 - Release Date: 05/09/11 -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20110510/9085ffb2/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
