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Total 6 documents matching your query.

1. [RFI] Actually an AFI Question ... (score: 1): Author: "doc@kd4e.com" <doc@kd4e.com>; Date: Thu, 03 Feb 2011 16:47:36 -0500; Can low-frequency audio be canceled using sound? I seem to recall someone using sound to cancel echos in a hall to improve the acoustic qualities. Would it be possible to detect thumpa-thumpa loud ca; /archives//html/RFI/2011-02/msg00024.html (7,064 bytes)
2. Re: [RFI] Actually an AFI Question ... (score: 1): Author: "Dr. Joeseph Mesh" <jm@drsmesh.com>; Date: Thu, 3 Feb 2011 17:18:16 -0500; The key is NOT destructive cancellation through equal and opposite sound pressure interference... The key is an absorptive approach that uses a green energy conversion to power your own vehicle! (Sou; /archives//html/RFI/2011-02/msg00025.html (9,214 bytes)
3. Re: [RFI] Actually an AFI Question ... (score: 1): Author: Andy <ingraham.ma.ultranet@rcn.com>; Date: Thu, 3 Feb 2011 17:43:14 -0500; David Clark, Bose, and others make noise canceling headphones, so yes, something like that is possible. David Clark is well known by airplane pilots. And I've seen (but not read) papers about reducin; /archives//html/RFI/2011-02/msg00026.html (7,444 bytes)
4. Re: [RFI] Actually an AFI Question ... (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 03 Feb 2011 18:30:48 -0800; At a single point, like in noise cancelling headphones. Sennheiser and Bose both make some that I would expect to work well. That is pure BS. Sound and acoustics in public spaces is my field, and I c; /archives//html/RFI/2011-02/msg00028.html (7,644 bytes)
5. Re: [RFI] Actually an AFI Question ... (score: 1): Author: "doc@kd4e.com" <doc@kd4e.com>; Date: Thu, 03 Feb 2011 21:56:47 -0500; This is obviously not my field, and a bit off-topic, so based on no way to acoustically cancel low-frequency sound waves in the open (yard) then I have to find a way to motivate the miscreants to tur; /archives//html/RFI/2011-02/msg00029.html (9,804 bytes)
6. Re: [RFI] Actually an AFI Question ... (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Thu, 03 Feb 2011 21:18:45 -0600; About the only way you can manage that in a straightforward manor is with good, old-fashioned AM. Or, alternatively, a two-tone input to an SSB transmitter. Both with plenty of power. But this does r; /archives//html/RFI/2011-02/msg00030.html (12,610 bytes)

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