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:
>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 listserv@mitvma.mit.edu with SET PICList DIGEST in the body
>
>
>
>

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body