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 ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~