[BC] Could our concept of audio be all wrong?

Robert Orban rorban at earthlink.net
Mon Mar 16 20:24:13 CDT 2009


At 06:07 AM 3/16/2009, Jim Tonne wrote:
>I was apalled when I examined some rock-n-roll CD tracks
>on an oscilloscope several years ago.  I noticed the AGC
>attack time was up in the few millisecond range (which is
>about where the ear likes it), then the overshoots were
>clipped (ugh!) and THEN the signal was pre-emphasized
>(presumably to the 50us/15us CD time-constants).

EIAJ preemphasis was always optional on CDs. Preemphasized CDs were 
always rare (mainly certain classical releases from the early days of 
the format) and by now are, as far as I know, extinct.

Bob Orban




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