Path: utzoo!attcan!uunet!husc6!mailrus!ames!pasteur!ucbvax!hplabs!hplabsz!mayer From: mayer@hplabsz.HPL.HP.COM (Niels Mayer) Newsgroups: comp.sys.next Subject: Re: Fwd: LSC problem Message-ID: <2634@hplabsz.HPL.HP.COM> Date: 17 Nov 88 04:08:48 GMT References: <6843@batcomputer.tn.cornell.edu> Reply-To: mayer@hplabs.hp.com (Niels Mayer) Organization: Hewlett-Packard Labs, Software Technology Lab, Palo Alto, CA. Lines: 23 Summary: Expires: Sender: Followup-To: In article <6843@batcomputer.tn.cornell.edu> sandell@tcgould.tn.cornell.edu (Gregory Sandell) writes: >So they say that the Motorolla could squeeze in 600 instructions between >every sample at 44.1kHz. Maybe the calculation could be done...but you also >have to be recording samples and running both D/A and A/D at the same time. >Could it really be done? Do you really need HI-FI anti-noise at 44.1 kilosamples/second? Since people really have trouble hearing stuff over 15khz (especially NOISE), you could probably scale back the time-domain resolution to under 30 kilosamples/second. You probably don't need CD quality signal domain resolution either (CD's have about 32 bits/sample for both channels). Hey! I got a GREAT idea. You could have it SAMPLE its own FAN and DISK drive noize and CANCEL this out using the DSP and an expensive A/D/D/A subsystem -- the NeXT box as a zen computational Rube Goldgberg device. I once built such "cone of silence" for Joe Isuzu's CAR, as well as for my WIFE's (Morgan Fairchild) battery operated sex toys, and now my life is so TWISTED and STRANGE that you have to put it in REVERSE to go FORWARD, and get it UP to go DOWN (respectively)... Yeah, that's the ticket.... -- Niels "maybe we can apply DSP noise cancellation to comp.sys.next" Mayer.