Path: utzoo!attcan!uunet!microsoft!brianw
From: brianw@microsoft.UUCP (Brian Willoughby)
Newsgroups: comp.dsp
Subject: Re: More digital mixer stuff
Message-ID: <7926@microsoft.UUCP>
Date: 2 Oct 89 02:30:12 GMT
References: <9238@pyr.gatech.EDU> <1989Sep29.102204.8798@ivucsb.sba.ca.us> <1160@lakesys.lakesys.com>
Reply-To: brianw@microsoft.UUCP (Brian Willoughby)
Organization: Microsoft Corp., Redmond WA
Lines: 29

In article <1160@lakesys.lakesys.com> mikes@lakesys.UUCP (Mike Shawaluk) writes:
>BTW, isn't this "delay" the same "problem" that's been mentioned with certain
>CD players, which use only one D/A converter for both channels, but mux the
>stereo outputs?

You hit it right on the head.

>                 One person (in a review I read) gave the analogy of standing
>1 cm closer to one of the stereo speakers in the room while listening to a
>CD, as being the effect of this phase shift (i.e., the speed of sound vs. the
>delay).

I had asked earlier about just how important it would be to correct such
phase shifts.  From the example of a room environment, I guess the answer
is: not very bloody important.  But, if the sound is to later be mixed -
for monophonic broadcast, or any other need to combine the stereo signals
electronically, not acoustically (where placement affects delay anyway) -
then it does become important, merely because the result (with its
peculiar frequency cancellations and reinforcements) would be different
than it would without the shift.

>-- 
>   - Mike Shawaluk 

Brian Willoughby
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