Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!rutgers!im4u!oakhill!dsp From: dsp@oakhill.UUCP (DSP Account) Newsgroups: rec.aviation,sci.electronics,rec.audio Subject: Re: Noise-cancelling microphone Message-ID: <892@oakhill.UUCP> Date: Sat, 23-May-87 21:54:36 EDT Article-I.D.: oakhill.892 Posted: Sat May 23 21:54:36 1987 Date-Received: Sun, 24-May-87 03:16:23 EDT References: <1027@mips.UUCP> Organization: Motorola Inc. Austin, Tx Lines: 27 Summary: DSP56200 chip, cascadable adaptive FIR filter, from Motorola is being used by several companies now in this application Xref: mnetor rec.aviation:1671 sci.electronics:735 rec.audio:1715 the very interesting application referenced below is just one of the many uses of adaptive digital signal processing which the DSP56200 chip, a 256 tap cascadable adaptive FIR (finite impulse response) filter(100ns cycle), from Motorola can provide. several companies are using the DSP56200 right now to solve this problem. the DSP56200 has been available since november 1986. literature, etc., can be obtained by calling (512) 440-2030 or you may send mail over the net. motorola salespeople can give you the same info. ask for BR283 and for DSP56200/D. week before last(today is 5/23), Widrow called us here in austin. he had just heard about the chip from one of his former students. he was very happy to see Motorola had implemented his LMS (least mean squares) algorithm in hardware. >From: mark@mips.UUCP (Mark G. Johnson) >I recently read (in Aviation Week & Space Technology) an article about >a noise-cancellation system for military pilots' helmets. Seems that >military cockpits are _very_ noisy, with helicopter blades whooshing, >fighter engines roaring, etc, so the pilot can barely hear his/her radio. >>From: randys@mipon3.intel.com (Randy Steck) >>The algorithm of adaptive signal processing apparently used in this system >>was invented by Widrow of Stanford. I audited a class he taught on the Motorola DSP Operation in oak hill, texas 512 440 2030