Post by thread:[PIC]: decoding hellscrieber with a pic

hi all, sure you can encode hellscreiber with a pic(http://home.clear.net.nz/pages/bryanjr/projects/hellbeacon.shtml).... but can you receive it? i think one could using an LCD and an f84 and a tone decoder. you could make the font appear on the lcd because it has all those little cells for 5x5 font you use each cell like this: XXXXX XXXXX XXXXX XXXXX XXXXX nnnnn nnnnn X's are used n's not. anybody wanna give it a go and help me code it?(thats only if it is possible ;) seem's easy =) if tone is on the selected cell is on if not then the cell is not on. then you wait and do it again and again and again andy -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Dear hellscreiber experimenters, Andy N1YEW <spam_OUTn1yewTakeThisOuTSOFTHOME.NET> on 2001-06-07 03:55:12 PM > sure you can encode hellscreiber with a pic( > home.clear.net.nz/pages/bryanjr/projects/hellbeacon.shtml > ).... Unfortunately, I can't seem to access the link on that page to "more details" www.conquestsys.com/hamradio/hellschreiber.html Is this a stale link ? Fortunately, a quick web search picked up other sites with details: http://iz8bly.sysonline.it/Hell/ http://members.nbci.com/ZL1BPU/ http://www.qsl.net/zl1bpu/ > > but can you receive it? > > i think one could using an LCD and an f84 and a tone decoder. A graphics LCD, of course ... that would be interesting. It looks like it would automatically handle arbitrary symbols. Including European letters with the little dots and slashes over them ... I wonder if Chinese letters would be legible ? I wonder if the PIC could emulate gray-scale somehow ? I've played with a relatively small (128x64 pixel) graphics LCD from Okaya Electric America Inc. http://www.okaya.com/ There's some bigger ones from Optrex listed in Digikey http://www.digikey.com/ . What other graphics LCD panels are people using ? What's a good source for low-cost panels ? -- David Cary -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

i was gonna use a 16x2 character and upload special characters :) andy ----- Original Message ----- From: "David Cary" <.....dcaryKILLspam@spam@BRUNSWICKOUTDOOR.COM> To: <PICLISTKILLspamMITVMA.MIT.EDU> Sent: Friday, June 08, 2001 4:29 PM Subject: Re: [PIC]: decoding hellscrieber with a pic > Dear hellscreiber experimenters, > > Andy N1YEW <.....n1yewKILLspam.....SOFTHOME.NET> on 2001-06-07 03:55:12 PM > > sure you can encode hellscreiber with a pic( > > home.clear.net.nz/pages/bryanjr/projects/hellbeacon.shtml > > ).... > > Unfortunately, I can't seem to access the link on that page to "more details" {Quote hidden}> www.conquestsys.com/hamradio/hellschreiber.html > Is this a stale link ? > > Fortunately, a quick web search picked up other sites with details: > http://iz8bly.sysonline.it/Hell/ > http://members.nbci.com/ZL1BPU/ > http://www.qsl.net/zl1bpu/ > > > > > but can you receive it? > > > > i think one could using an LCD and an f84 and a tone decoder. > > A graphics LCD, of course ... that would be interesting. It looks like it would > automatically handle arbitrary symbols. Including European letters with the {Quote hidden}> little dots and slashes over them ... I wonder if Chinese letters would be > legible ? I wonder if the PIC could emulate gray-scale somehow ? > > I've played with a relatively small (128x64 pixel) graphics LCD from > Okaya Electric America Inc. > http://www.okaya.com/ > There's some bigger ones from Optrex listed in Digikey > http://www.digikey.com/ > . > What other graphics LCD panels are people using ? What's a good source for > low-cost panels ? > -- > David Cary > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

I think that a PIC needs DSP capability to decode Hellschreiber and also a graphical LCD, or else you will be displaying only 8 characters at a time. The display on a standard LCD will also flicker in nasty ways if you update the patterns while they are displayed. Last, the power of the Hellschreiber would be lost by brutal slicing in a black/white decision. I think that a good Hellschreiber receiver can be made using spinning clock (propeller clock) technology and analog filters. A PIC could handle timing and sync issues although I suspect I'd try the good old tape motor with settable speed by hand at first. Peter -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email EraseMElistservspam_OUTTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

Interesting problem, the hellschreiber decoding is done by the brain recognizing letters amongst the noise. The brain is so good at this I suspect you would need a LOT of image processing power to do the job You need the ability to do convolutions over the image to try and find edges and connected regions, and then try to map the resulting patterns into recognizable letters, I would start with a lot of ram and good matrix math capability. Maybe look at some of the dedicated image processing chip like zoran and others.. At 22:53 8/06/01 +0300, you wrote: {Quote hidden}>I think that a PIC needs DSP capability to decode Hellschreiber and also a >graphical LCD, or else you will be displaying only 8 characters at a time. >The display on a standard LCD will also flicker in nasty ways if you >update the patterns while they are displayed. Last, the power of the >Hellschreiber would be lost by brutal slicing in a black/white decision. > >I think that a good Hellschreiber receiver can be made using spinning >clock (propeller clock) technology and analog filters. A PIC could handle >timing and sync issues although I suspect I'd try the good old tape motor >with settable speed by hand at first. > >Peter > >-- >http://www.piclist.com#nomail Going offline? Don't AutoReply us! >email listservspam_OUTmitvma.mit.edu with SET PICList DIGEST in the body > > > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email @spam@listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body