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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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LordSyl
post Dec 20 2002, 01:56
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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?


IMO That's because some people can hear even more than 20kHz....up to 22kHz.

Me, for example, with my equipment (SBLive 5.1, FPS1000 4.1 speakers) I've generated sine waves (sampling rate 48000Hz, of course.....) and I can hear up to 20kHz (the speakers' and soundcard' response is no more than 20kHz, if more juice is used then downpitching occurs)
Of course, any frequency above 16kHz, for me, requires additional amplification (normalization) gradually....but I can actually hear 'em. Would be nice if I could test for hearing above 20kHz tongue.gif
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