At 16:13 23/6/2013, Martin Leese wrote: >Others have mentioned Trifield. The definitive >paper for this is: >M.A. Gerzon, "Optimum Reproduction Matrices >for Multispeaker Stereo", J. Audio Engineering >Society, vol. 40 no. 7/8, pp. 571-589 >(1992 July/Aug.) >
There are two complementary papers on this subject by MG. The other is "Hierarchical Transmission System for Multispeaker Stereo", JAES vol 40, no 9, Sept 1992, pp.692-705.
I set up his matrices for 2 into 3 channels in RME's TotalMix and found the results very encouraging, with stable images. The only problem is that the left and right speakers need to be further out than +/- 30 degrees, which in turn necessitates a wider room. I intend to investigate this setup further when I get my speakers back from the movers.
David >This in available in the Ambisonic Motherlode >at: >http://decoy.iki.fi/dsound/ambisonic/motherlode/data/1991_Optimal%20Re >production%20Matrices%20for%20Multispeaker%20Stereo%20(TRIFIELD)_Gerzon.pdf > >The key content is Figure 16; the shelf filters >have different gains above and below 5 kHz. > >In this paper, MAG argues strongly that >augmenting the existing L and R channels with >an additional C channel will not produce good >results. Instead, he suggests that it is better to >derive three new L, C, R output channels from >the L, R input channels. > >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 _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
