Upsampleing?


I have a little problem understanding the concept of upsampling. Maybe someone can explain it to me. If a redbook CD is 44.1hz how can upsampling produce a 192hz out of a 44hz disc? Doesn't the disc only have 44hz on it, so therefor is the upsampling just bridging the "gaps" and essentially smoothing out the sampling rate segments?
I wonder if the improved sound is really a fabrication more than an unrevealing of music that is supposedly there in the disc and being missed by most players.
theo

Showing 2 responses by kr4

Of course. Upsampling cannot get more information out of the original since there is no more information. It can help with the necessary filtering and other processing.
Actually, the stair-step analogy is not accurate as the reconstruction filter smooths the outputs to the same result. Now, the nature of that filter can be affected by the output sample rate but that's another story.
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