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From: acscmjm@sunybcs.UUCP
Newsgroups: net.audio
Subject: Re: Tubes, CDs, sq waves, nonscience (the bleat goes on)
Message-ID: <91@sunybcs.UUCP>
Date: Mon, 2-Jul-84 19:56:13 EDT
Article-I.D.: sunybcs.91
Posted: Mon Jul  2 19:56:13 1984
Date-Received: Fri, 13-Jul-84 03:49:35 EDT
References: <579@opus.UUCP>, <83@sunybcs.UUCP>
Organization: SUNY/Buffalo Computer Science
Lines: 43

[                                        ]Help!!! I'm TRAPPED in a VAX 11-780!!!!

> Time x, sample only channel a.
> Time x+1, sample only channel b.
> Time x+2, sample only channel a.
> Time x+3, sample only channel b.
>  .
>  .
>  .
> Time x+n, sample only channel a.
> Time x+n+1, sample only channel b.
 
> This clearly reduces the effective sample rate by dividing it by 2.

This is correct (except instead of 'x+2' 'x+2k' where k is the sample
time, but this is minor)
 
> At any given time Z, sound is only coming from channel Q.
> Rather simple an idea... multi-plexed mono.

Ahhh, but you are forgetting something... it is NOT multiplexed mono,
because the information corresponding to channel A and channel B
is DIFFERENT, though interlaced.
 
> But then you say, double the speed of the reading/processing and you
> recover the loss...
 
That's right.  You double the resolution and then halve it by alternately
sampling the other channel, you get the same resolution. (2 * 1/2 = 1)

>                       ... It would also make reasonable the
> doubling of the sample rate of all other units operating in true
> dual channel mode, or the doubling of the resolution.
 
You can double the sample rate without doubling the size of the
medium or halve the time because there is now only ONE channel to
deal with.
 
						Mike Moroney
						(respond via news,
						since i am moving on
						to bigger and better
						things)