The C.A.S. and Digidesign Present - Avid Pro Audio Community

01-14-2006, 10:21 AM

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Re: The C.A.S. and Digidesign Present

[QUOTE]

Quote:

Now who can tell me why CD-quality audio is sampled at 44.1kHz (hint - its related)?

it doesn't have to do with NYQUIST and/or a certain SONY excecutive who wanted all of Beethoven's 9th on one disc?

No, although that makes for a great myth. NTSC video has 490 lines of visible picture per frame. There are 30 frames per second (humor me). 490*30=14,700 lines/second. CD quality audio is sampled at 44,100Hz. 44,100/14.700=3. The devices used to encode digital audio to U-Matic recorders encode three (3) 16 bit samples per line.

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Jonathan S. Abrams, CEA, CEV, CBNT
Apple Certified - Technical Coordinator (v10.5), Support Professional (v10.6 through v10.10)

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