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To: DWB who wrote (11325)3/31/1998 1:32:00 AM
From: Mang Cheng  Read Replies (1) | Respond to of 25814
 
Daniel, I think you are right. The following paragraph clearly made the distinction :

"In addition, the CR3700 (note : which Crus makes) provides a direct interface to MPEG-2 audio and video decoders (which LSI makes) for DVD-Player applications. "
biz.yahoo.com

For articles about Sony's DVD drives :

sel.sony.com

msnbc.com

Mang



To: DWB who wrote (11325)3/31/1998 9:21:00 AM
From: DWB  Read Replies (1) | Respond to of 25814
 
Jim Jubak's column today on the Microsoft Investor site goes through a number of stock screening methods, and of the set he winds up with at the end, LSI is one of the bargains...

investor.msn.com

Add another piece of straw to the load on the LSI camel's hump...

DWB



To: DWB who wrote (11325)3/31/1998 9:49:00 AM
From: Grand Poobah  Read Replies (1) | Respond to of 25814
 
You are correct, CRUS and LSI are not competing with each other in DVD. Since I am an investor in both, I have recently done some research on the subject.

The CRUS chip is a controller for DVD-ROM or DVD-player. Its functions include signal processing (turning the analog signal from the disc into a digital bit stream), servo control (controlling where the head moves on the platter), Content Scramble System (CSS) authentication (not sure about this, I think it means it checks to see that it's properly encrypted but doesn't actually decrypt anything), error correction (gets rid of errors in the digital bit stream, one of the more complicated functions), and a CD-ROM decoder. It then passes the MPEG-2 data to another chip for decoding.

The LSI DVD decoder chip does CSS decryption and decodes the MPEG-2 data into audio and video.

The DVD controller technology at CRUS is based on their CD-ROM controllers. I know Oak Technology, who is the market leader in CD-ROM controllers, is marketing both a DVD controller chip and a DVD decoder chip.

My understanding is that a DVD player would require both a controller chip and a decoder chip, while a DVD-ROM for PC would require a controller chip, but the decoder chip would be optional, since the MPEG-2 decoding could be done in software using the CPU. Whether that is an optimal design or merely a cost-saving measure, I don't know.

G.P.