----- Original Message -----
From: "Bob Ammerman" <rammerman@ADELPHIA.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, June 20, 2002 4:24 PM
Subject: Re: [PIC]: IR Universal Remote Joys & Woes


> Here is an idea:
>
> 1: Create a data structure, called 'dictionary' of 16 bytes. Initialize it
> to all zeros
>
> 2. Assume you won't see more than 16 different pulse widths
>
> 2. Measure each mark and space as you do now
>
> 3. Compare the time of the mark or space to the entries in the dictionary.
> Find the 'nearest' value in the dictionary. If there is an entry 'close'
to
> this value then:
>
>     Modify the dictionary entry to be ( 3 * dict_entry + new_value) / 4.
> This step will hopefully help the dictionary entry be             closer
to
> the exact correct time.
>
> otherwise allocate an unused dictionary entry and store this time in it.
>
> 4. Record the three-bit index (0..15) of the dictionary entry that was
found
....er, that is 'four-bit index', not 'three-bit index'
> or added. Now you can store 2 times (one mark, one space) in each byte of
> memory.
>
> Now, for a 34 bit code you will need:
>
> 16 bytes for the dictionary
> 34 bytes for the time codes
> ---
> 50 bytes total
>
> Bob Ammerman
> RAm Systems
>
> --
> http://www.piclist.com hint: To leave the PICList
> mailto:piclist-unsubscribe-request@mitvma.mit.edu
>
>

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu