Le 7 juin 2011 17:39:39, jim moses a écrit : > I think our localization of energy below 80Hz is ambiguous at best and is > complicated even more by the reality of room modes (that provide their own > spatial effect). But the bass range from about 100Hz to 600Hz is important > to provide a good sense of stereo width and envelopment. (There's an old > technique of using a 'shuffler' or 'spatial equalization' to enhance stereo > width in this range ( > http://www.audiosignal.co.uk/Resources/Stereo_shuffling_A4.pdf)).
Le 9 juin 2011 03:40:45, Bo-Erik Sandholm a écrit : > This paper gives a interesting aspect on the lowfrequency playback > http://www.maxx.com/objects/PDF/MaxxBassAESPaper.pdf So, psycho-acoustics can help when listening conditions are not optimal (like in a small room with small speakers). Le 9 juin 2011 12:25:49, Fons Adriaensen a écrit : > Just performed a little experiment. > > Sine wave of 50 Hz, linear rise to full amplitude in 150 ms, hold 250 ms, > linear fade out of 150 ms. The spectrum of such a signal is more than 60 > dB down at 100 Hz re. its peak at 50 Hz. > > Panned to random directions in 3rd order Ambisonics and reproduced on > the horizontal octagon at the LABEL studio (Quested SR8). > > I can *easily* tell from which direction it comes. There is some > front/back ambiguity if (and only if) I keep my head fixed, but > that is to be expected. Great! Did it work because of the room modes and/or standing waves at 50Hz? Can you try with other frequencies ranges (between 50Hz and 80Hz)? Can you also try panning a continuous tone (instead of short tones)? (I don't have an Ambisonics installation yet, so I can't try myself...) :) -- Marc _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
