From: Robert Brooks <rb@hprrb.rose.hp.com>
Date: Thu, 10 Dec 92 14:36:21 PST
To: cypherpunks@toad.com
Subject: A/V compression
Message-ID: <9212102233.AA15517@hprrb.rose.hp.com>
MIME-Version: 1.0
Content-Type: text/plain


> 
> This brings up a fun concept: encrypted digital video and audio.
> Would it be hard to do IDEA encryption at the standard CD rate?
> There are schemes to compress video to that rate--how available
> are they?  How much investment in equipment and crunch time do 
> you need?  How easy is it to interrupt the bit streams in and out
> of a DAT recorder?  How cheap is the decoder?
> 

I picked this up off the net a while ago.  Sounds like the CL451 might
be programmable to do encryption/decryption, too.

Background:  MPEG is a compression standard for compressing VHS-quality
video and stereo audio into a 1.5Mbit/s stream.

If anyone's interested in funding/collaborating on a project involving
this, let's talk.


---
>From eletanjm@nuscc.nus.sg Fri Jul 10 21:06:25 1992
>Relay-Version: version Notes 2.8.4  1990/05/09; site hprpcd.rose.hp.com
>From: eletanjm@nuscc.nus.sg (TAN JIN MENG)
>Date: Sat, 11 Jul 1992 04:06:25 GMT
>Date-Received: Sun, 12 Jul 1992 01:35:12 GMT
>Subject: NEW MPEG I CHIP
>Message-ID: <1992Jul11.040625.17239@nuscc.nus.sg>
>Organization: National University of Singapore
>Path: hprpcd!hprdash!hpergfg2!hpda!hpcc05!hplextra!hpscdc!sdd.hp.com!nigel.msen.com!yale.edu!jvnc.net!nuscc!eletanjm
>Newsgroups: comp.multimedia
>Lines: 23
>
>Has anyone seen a demo or read about the new MPEG chipset from C-Cube
>systems?
>
>I heard it's great!
>
>Some facts I know (or think I know)
>
>*       CL450 - is a decoder only
>*       CL451 - due out later this year is full encoder/decoder codec
>*       core is a RISC based processor with 36bit bus splittable into
>        4 data streams. 4 separate acc/mul units (ie SIMD).
>*       Can stream a full resolution video at ISA bus rates.
>*       Microcode and C compiler development kit.
>*       CL451 currently runs at 66MHz using fairly old .8 micron
>        technology ==> we can expect to see even higher speed devices.
>*       CL451 is pipelinable - ie can put multiple CL451 in tandem to
>        perform any amount of processor intensive activities. (eg real
>        time edge/motion detection, special effects etc).
>*       CL451 is a single chip solution. Just add VRAM.
>
>*       Largest demand so far - for Karaoke!! C-Cube has Jap. backers.
>
>jin meng
>
>
>
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~       Robert Brooks                           ~
~       Hewlett Packard Company                 ~
~       rb@hprpcd.rose.hp.com                   ~
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~       Robert Brooks                           ~
~       Hewlett Packard Company                 ~
~       rb@hprpcd.rose.hp.com                   ~
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~