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The Basement
Home "theaters"
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<blockquote data-quote="John Roberts" data-source="post: 113063" data-attributes="member: 126"><p>Re: Home "theaters"</p><p></p><p>I haven't messed with this recently but back in the '80s I used to sell a surround sound decoder (based on analog delay line). The matrix was pretty simple. Front left and right were stock. The mono center channel (if used) was L + R. The rear channel was also mono but L-R. There was also some delay added into the rear channel, so your ears would receive loud sounds from the front speakers before the rear speakers and perceive the sound and action as being in front of you localized on the screen. The whole idea is for the rear speakers to be sonically invisible, so your brain perceives those rear sounds as environmental, not discrete sources. </p><p></p><p>Modern mutli-channel surround systems probably use logic to enhance separation, and maybe even discrete channels, but the simple L-R surround matrix worked nicely even with simple stereo music. </p><p></p><p>JR</p><p></p><p>PS: I've heard some poorly handled movie soundtracks (on local TV) sound silly, when the mixed hard left & opposite polarity hard right surround channel special effects explosions mostly cancelled out when the program was dumped out as summed together mono for broadcast. :-(</p></blockquote><p></p>
[QUOTE="John Roberts, post: 113063, member: 126"] Re: Home "theaters" I haven't messed with this recently but back in the '80s I used to sell a surround sound decoder (based on analog delay line). The matrix was pretty simple. Front left and right were stock. The mono center channel (if used) was L + R. The rear channel was also mono but L-R. There was also some delay added into the rear channel, so your ears would receive loud sounds from the front speakers before the rear speakers and perceive the sound and action as being in front of you localized on the screen. The whole idea is for the rear speakers to be sonically invisible, so your brain perceives those rear sounds as environmental, not discrete sources. Modern mutli-channel surround systems probably use logic to enhance separation, and maybe even discrete channels, but the simple L-R surround matrix worked nicely even with simple stereo music. JR PS: I've heard some poorly handled movie soundtracks (on local TV) sound silly, when the mixed hard left & opposite polarity hard right surround channel special effects explosions mostly cancelled out when the program was dumped out as summed together mono for broadcast. :-( [/QUOTE]
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