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Re: [Discuss-gnuradio] Signal processing in Python

From: Achilleas Anastasopoulos
Subject: Re: [Discuss-gnuradio] Signal processing in Python
Date: Thu, 23 Aug 2007 17:19:09 -0400
User-agent: Mozilla Thunderbird 1.0.2 (Windows/20050317)


it seems like this transmission scheme can be modeled using a finite state machine (fsm). Take a look at the gr_trellis section of gnuradio. There you can find an abstract class to define fsm's and to encode/decode their inputs/outputs.


Max Moser wrote:
Sorry for that, shure i would be happy to provide you some information i am currently stuck anyways in developing a decoder because i am not the best in signaling stuff :-)

Ok well i know that the signal is Miller encoded (Aka Delay encoded)

On this website you can see a short description:


Because i know that it is generated by a Texas Instrumets Chip and there is a reference implementation, i know that is for shure miller encoding and it also looks like miller.

The reference encoding does only cover mouse data transmission (not receiving part) so i have to write the decoding for it. What i want at the end is just the binary data so that i can dissect or construct packets. But the missing part in the puzzle currently is the miller decoding of the received signal
to gain the binary data stream. (Ups i repeat myself.)

Ok for the sake of clarity i attached two pages of the reference installation doument (Available at the TI website) which descibes the encoding mechanism.

So any help is welcome.

Thanks a lot.



On Aug 23, 2007, at 5:36 PM, Achilleas Anastasopoulos wrote:


could you describe in a bit more detail what is the
decoding function you want to implement.
Chances are it is already implemented in gnuradio.


Achilleas Anastasopoulos                        
Associate Professor
EECS Department               Voice : (734)615-4024
UNIVERSITY OF MICHIGAN        Fax   : (734)763-8041
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