When circuit that perform the desired function are used for loudspeakers they are commonly called cross-talk cancellers.
With speakers in a normal room, both ears hear both speakers. By crossfeeding and inverting the phase of the crossfeed signal and adding a slight delay and attenuation to compensate for interaural spacing, the result is that with some recordings the sound of the instruments and voices can appear to come from locations other than the speakers. It works great with some recordings and not so great with others. Carver made a device called a C-9 Sonic Hologram processor for this purpose. It worked well if you were in the right position and your speakers were placed symetrically in your room. It is pretty easy to implement this sort of thing with a few op-amps. You can play with that sort of circuit and hear its effect using SwitcherCAD, the spice based circuit simulator you can DL from Linear Technology for free. SWCAD has .wav file input and output functions, so you can specify a .wav file to process and it will generate a .wav file with the crossfeed/crosstalk cancelation. It is NOT real time! It can take a long time to process the .wav input file, so short snippets are best. The circuit pictured does simple crossfeed with no delay, but will give you a taste of the possibilities. It is easy to add an all-pass filter to generate a little delay. If such a circuit were included in the SB, either as hardware or software, I recommend that the remote include a button to switch it on and off with a single press. TD +-------------------------------------------------------------------+ |Filename: crossfeed.jpg | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=1420| +-------------------------------------------------------------------+ -- tyler_durden ------------------------------------------------------------------------ tyler_durden's Profile: http://forums.slimdevices.com/member.php?userid=2701 View this thread: http://forums.slimdevices.com/showthread.php?t=16068 _______________________________________________ discuss mailing list discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
