🚀 go-pugleaf

In article <4154@mit-caf.MIT.EDU> mpl@mit-caf.MIT.EDU (Mark Lubratt) writes:

   In article <1554@redsox.bsw.com> campbell@redsox.bsw.com (Larry Campbell) writes:
   >CDs would have been nice if they had a decent high frequency rolloff; but if
   >I A/B an LP and a CD it is clear that the CD has cut off the higher
   >frequencies. 

   Even if you can hear beyond normal hearing, the fact is that when listening
   to normal music, the energy in the lower frequencies mask out your perception
   of higher frequencies.  That is why one can make an amplifier with a 15KHz
   rolloff and noone could tell except if they send pure tones through
   it.  For normal broad band applications, the lower frequency energy
   will mask out what you would normally hear above 15KHz and you will
   never know it is missing.

So, you've never listened to cymbols? snare drums? organ? trumpets? All
have significant information ("harmonics") well past 15KHz, well past 20KHz
for that matter. No, not everyone can hear them. Not everyone can "hear"
terminals (15Khz flyback) either - but personally I find them rather an-
noying. Chopping off music at 20KHz (CDs) or even 15KHz (FM, and de facto
much prerecored music) doesn't deter you from identifying what instrument
is playing, any more than NTSC TV pictures deters you from identifying
what actor/ess is playing, but higher resolution is distinguishable, more
enjoyable (and/or realistic), and addicting to boot.

					-RDH
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