This process creates a more spacious ambience within the stereo field, producing strong special cues for different instruments in an audio mix. Now, unlike several other stereo enhancers, the AK does not have time delay processing, its Sound Retrieval System is single-ended, requiring no prior encoding of program sources. It employs no artificial reverberation, and neither does it use harmonic generation or artificial phase correction alteration. SRS is based on certain principles of human hearing that have been explored by Hughes researchers and others over the years. The Hughes system addresses the fact that the transfer function of human hearing is not constant. For example, sounds coming from straight ahead have a different transfer function, or frequency characteristics, than sounds coming from the sides or from the rear.
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Do you really get 3-D sound out of 2 speakers? Click to expand A basic flaw to stereo is that you get two many events arriving at your ears, compared to the actual sound event that was recorded. Picture a recording of an orchestra with a pair of mikes. A sound that originates on the stage will reach one mike and then the other depending upon which is closest.
So a single sound even on stage becomes two events when recorded in stereo. Now, play it back on a speaker system in your listening room. You get two events played back, one from each channel. So you get an event from each speaker. However, the event from each speaker will reach both your ears. The net result is that you get 4 events from a single event on stage. The idea behind things like the Carver unit and the others is that you can cancel out the extra events.
That cancels the extra event when it combines at that opposite ear R. But I recently got a chance to listen to my old unit I had sold it to a friend on my current stereo system and it worked very nicely on some recordings. Interestingly enough, it works best on multi-mono pop recordings. I find that the soundstage expands way beyond my speakers and things become more specific in location.
Some percussion instruments like the cowbell become almost 3D. More cowbell please! I had some similar experiences with using BruteFIR to do crosstalk cancellation, but it was setup differently so that the included angle between speakers needed to be much smaller. I wound up with the speaker sitting right next to each other directly in front of me. I think the angle was 15 degrees.
SRS Labs and Dolby have been working on this kind of thing.
HUGHES AK-100 SOUND RETRIEVAL SYSTEM SRS
It matches up pretty well with the NAD reciever. The Marketplace for Musicians jughes Log in or Sign up. Do you really get 3-D sound out of 2 speakers? To put it simply, we are tricked into believing that sounds are coming from locations other than the two loudspeakers in front of us. I use mine almost all of the time. That was a form of ambiance enhancement.
HUGHES AK100 PDF