I read in !emc-pstc that Ken Javor <ken.ja...@emccompliance.com> wrote (in <bb48596e.36a1%ken.ja...@emccompliance.com>) about 'pulse modulation in reverb chambers' on Sat, 26 Jul 2003:
>What is the limitation on minimum pulse width in reverberation chambers? >I expect it relates to room size, but does anyone have either a >functional relation or a rough order of magnitude? Light travels 300 >meters per microsecond, so I would think a 1 microsecond pulse width >would work just fine, but nanosecond rise-times would be lost. Judging by what happens a million times slower in acoustics, I think 1 microsecond could be quite a bit short. Obviously it depends on the size of the chamber. If there is a paddle, it might be necessary to allow several turns of it to establish a cyclically stable field pattern. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
