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48, 44.1 khz, why no and/or not 40 khz, Only for 2 channel audio...........
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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post Dec 18 2002, 05:04
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Low/High pass filters and sampling rates are totally different. "MOST" human ears cant hear FREQUENCIES past 18.5 kHz 20 kHz, and that is what a cutoff's purpose is - to filter out the high frequencies a person cant hear and would otherwise waste space. SAMPLEING RATES refer to how many times a sound card takes a "snapshot" of the sound - think of it the same way you think of movie frame rates. CD sound has a sampling rate of 44.1 kHz, and DVD audio has a 48 kHz sampling rate. Going below a 44.1 kHz sampling rate greatly hurts sound quality - its like listening to a radio. Just record a sound at a 22.050 kHz sampling rate and see what I mean. Also, the quality re-sampling a CD's 44.1 kHz sampling rate to 40 kHz would further degrade sound quality. Most sound cards probably don't support irregular sampling rates either, so a 40 kHz sampling rate is a moot point. Hope Ive helped you out a bit.
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