At 09:02 PM 4/10/04 +0000, you wrote: >Greetings, >I am putting together an experimantal addon to my repeater. It will >consist of 3-5 remote receivers situated in various spots in the >repeater coverage area. The idea is to make handheld access possible >over the entire coverage area. Handhelds can hear fine, but have a >tough time with one watt and a rubber ducky getting back to the >repeater. Each receiver site will consist of VHF radio, computer and >an internet connection. No rf linking will be done so that remote >receiver sites can be located without worrying about station licence >issues. The key piece of software I need help with is a digital signal >quality test. I need something like a sinad measurement done by each >remote receiver site on a packet of digitized audio (1.-.2 >seconds/packet). Standard sinad measurements use a 1khz test tone... I >need something that works on on normal user audio. The best idea I >have come up with so far is to digitally bandpass filter the user >audio from 300-3500hz and compare this with a sample of digitally >bandpass filtered audio from 2000-3500hz. This gives a number which is >(signal+noise)/noise. > >Has anyone any suggestions for this audio quality test? Does anyone >have a description of how various analog voting cards function?... >perhaps something similar can be done in the digital domain. > >cheers >Lawrence VE7IT
Three articles to look at: <http://www.repeater-builder.com/pdf/rvs.pdf> <http://www.repeater-builder.com/rbtip/votingcomparators.html> <http://www.repeater-builder.com/rbtip/remotereceivers.html> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
