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48, 44.1 khz, why no and/or not 40 khz, Only for 2 channel audio...........
kotrtim
post Dec 18 2002, 04:11
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Look at this Poll

How high can you hear (with music & lowpass)


The poll starter didn't put frequency above 20 khz in the poll
So why don't just use a 40 khz PCM instead of 44.1 khz as human
can't listen to frequency above 20 khz?

16 x 44100 x2 = 1141.2 kbit/s

16 x 40000 x 2 = 1280 kbit/s

It does help to save some space!
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mvdb
post Dec 19 2002, 01:00
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QUOTE (kotrtim @ Dec 18 2002 - 03:11 AM)
So why don't just use a 40 khz PCM instead of 44.1 khz as human can't listen to frequency above 20 khz?

One of my freshman university courses said it's an "engineering-margin". You take a little more than 2 x 20 kHz just in case, the system will always have flaws and imperfections, so they'd rather not live 'on the edge'. So for example if one of your filters cuts off a few hundred Hz too soon, it's still unhearable.

Why include high frequency noises if you can't hear them and they only give you headaches and make you angry? mad.gif
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