Path: utzoo!mnetor!tmsoft!torsqnt!jarvis.csri.toronto.edu!cs.utexas.edu!usc!ucsd!ucbvax!hplabs!hpda!hpcupt1!hprnd!marco From: marco@hprnd.HP.COM (Marco Gonzalez) Newsgroups: comp.sys.amiga Subject: Re: Introducing a DSP board for the Amiga (LONG) (REPOST) Message-ID: <2550032@hprnd.HP.COM> Date: 6 Mar 90 00:24:03 GMT References: Organization: HP Roseville Networks Division Lines: 62 limonce@pilot.njin.net (Tom Limoncelli) writes: NOTE: This is not intented to be a flame whatsoever. >WARNING: This is really long because I wanted to include a lot of >detail. I'm really excited about this product. [stuff deleted] >Amiga sound stores 8-bits for every "number" when it digitizes or plays >sound. A CD player uses 16-bits (or 18 ...depending on how you think A CD samples at 12bits resolution, not 16 or 18. >about it) per number. A CD player plays at 44.1MHz; this means that it Wrong, when the CD is recorder, data is sampled at 44.1KHz (Kilo Hertz, NOT MEGA Hz). This number is more than twice the maximum frequency a human can hear (suposed to be 20KHz), so that the original signal can be reproduced without information lost even for the "highest" frequency. >records 44.1 million numbers per second! Now you understand why a DSP 44.1 thousand numbers per second!. see above. >has to be able to do fast math. If you have an equation that will >lower a sound 2 octaves and you want to do it in real-time; you need to >do that equation 44.1 million times per second. see above. [stuff deleted] The AT&T WE 32c DSP Chip: ------------------------- > Uses floating point (can "hear" better than a human). I think you are miss-using the term "hear". The actual "hearing" is performed by some external device, usually a microphone. (i.e. a chip CAN NOT "hear"!). [stuff deleted] > -- ALMOST REAL-TIME RAY-TRACING. Ray-tracing is slow because it >requires so much floating point math to be performed. This is what the >DSP does well! yes it does, but depends on what do YOU call ALMOST REAL-TIME. near real-time ray-tracing is far away from reality on most machines, even on the high-end. And even with this chip, the 68000 would not make almost real-time ray-tracing possible. [stuff deleted] >copying permission granted only from me. Permission granted to copy >throughout Usenet/Bitnet/Internet/FidoNet. I can be contacted at >+1 201 408 5389 or as tlimonce@Drew.edu or tlimonce@Drew.Bitnet or >limonce@pilot.njin.net or "Tom Limoncelli / Drew University / PO Box >802 / CM 1060 / Madison, NJ 07940". >-- >Tom Limoncelli The computer industry should spend more time in front of >tlimonce@drew.uucp their computers. Remember when "Look & Feel" >tlimonce@drew.Bitnet was what you tried to do on a date? >limonce@pilot.njin.net ---------- Marco. Disclaimer: My opinions in no way reflect those of my employer.