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From: heath@shumv1.uucp (Heath Roberts)
Newsgroups: sci.electronics
Subject: Re: I don't need HDTV!
Message-ID: <1990Mar21.133329.25878@ncsuvx.ncsu.edu>
Date: 21 Mar 90 13:33:29 GMT
References: <sa0KhqO00Uh7M2R25C@andrew.cmu.edu> <9662@pixar.UUCP> <1990Mar20.162s.ucdavis.edu>
Reply-To: heath@shumv1.ncsu.edu (Heath Roberts)
Organization: NCSU Computing Center
Lines: 26

In article <7104@ucdavis.ucdavis.edu> (Alan Waterman) writes:
>
>>Enter here the Nyquist criterion which says that the sampling frequency
>>recorded.  Therefore, the highest frequency which can be accurately 
>>reproduced from a 44.1 kHz digital recording is 22.05 kHz, which is within 
>>the range of hearing of several folks posting here.  I suspect my audible
>
>Dude!!!! That is really really dumb. It is not 44.1 KHz per channel. It is
>22.05KHz per channel. Have you forgotten STEREO?????????
>
>By your own reasoning, the sampling rate should be at least 88.2 KHz which
>is exactly what I posted a few messages back.

The sampling rate is still 44.1KHz, and you get a frequency response of
22.05KHz. For more than one channel (stereo, 4-, 8-, 16-, 32-track
studio, etc.) you add more ADC's, each of which operates at the same
sampling frequency. Yes, you are taking 44,100 samples * the number of
channels per second, but it's kind of like saying you have two radios
receiving at 100MHz so collectively they're receiving 200MHz. It just
doesn't make sense. Everything's happening at the single channel sync
rate, it's just in parallel.


Heath Roberts
NCSU Computer and Technologies Theme Program
heath@shumv1.ncsu.edu