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From: caf@omen.UUCP (Chuck Forsberg WA7KGX)
Newsgroups: net.video
Subject: Re: Laserdisc vs CD sound
Message-ID: <264@omen.UUCP>
Date: Sat, 30-Nov-85 09:38:32 EST
Article-I.D.: omen.264
Posted: Sat Nov 30 09:38:32 1985
Date-Received: Thu, 5-Dec-85 04:26:13 EST
References: <2266@amdahl.UUCP> <446@nicmad.UUCP>
Reply-To: caf@omen.UUCP (Chuck Forsberg WA7KGX)
Organization: Omen Technology, Portland
Lines: 24

In article <446@nicmad.UUCP> brown@nicmad.UUCP (Mr. Video) writes:
>BTW, I'm sure that you have discovered by now that the video laser disk camp
>now has stereo digital audio.  Where they put the information in the
>available bandwidth is not known to me.  I really haven't dug into video
>laser disk technology.  I probably should.

LV Digital Audio information is stored in the 0 to 2 mHz band, same
coding as Compact Discs.  The analog soundtracks are at 2.3 and 2.8 mHz
(FM, 75 us preemphasis, 100 kHz modulation).  The FM soundtracks are
often CX encoded to yield a total of 70+ db s/n ratio.  The video is
directly modulated on an 8 mHz carrier, with a bandwith better than 4
mHz, about twice as good as VHS or Beta.

The analog sound tracks give as good sound as VHS or Beta Hi-Fi, but
without head switching noise.  The actual quality difference on movies
tends to be more pronounced because tape duplication involves more
generations.

-- 
  Chuck Forsberg WA7KGX   ...!tektronix!reed!omen!caf   CIS:70715,131
Omen Technology Inc     17505-V NW Sauvie Island Road Portland OR 97231
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