Matteo Campanella wrote: > Hello Eric, I am basically doing the same you did on the RDS code and > specification; right now I have introduced syndrome based sync and > indeed it looks like it get synced much faster. I am using the wfm > receiver (non pll), but, not having implemented the loss of sync yet, I > cannot tell how fst sync comes and goes :) > > The ideal thing would be to build up a wxwidget from python able to show > the rds data in a fancy way, in order to complete the FM receiver with > RDS info on GUI - given the time left over from work I think it'll take > ages, and right now priority one is to work Laccadive Islands DXpedition :) > > 73 matteo iz2eeq > Hello,
The specification gives some suggestions about loss of sync. I just count up to 20 errors in a row then resync. I want to implement error correction. I came across some example code for RDS when researching BCH codes. A "RDS Explorer" app would be neat. Have it display the PI, PS, RT and various codes. Right now I am dumping text out the console: PI KAKZ Pgm Top 40 Group 0A PS = Beyonce Mono PI KAKZ Pgm Top 40 Group 8A UKN 1: 9 2: 41da 3: 482c PI KAKZ Pgm Top 40 Group 0A PS = Beyonce Mono PI KAKZ Pgm Top 40 Group 2A RT: txt seg = 28, a/b = 1 RT A: Beyonce - Irreplaceable - KISS 108 - s RT B:Beyonce - Irreplaceable - KISS 108 - s PI KAKZ Pgm Top 40 Group 0A PS = Beyonce Mono PI KAKZ Pgm Top 40 Group 8A UKN 1: 9 2: 197 3: 410c PI KAKZ Pgm Top 40 Group 3A AI Group 8A Message = 40c0 AID = cd46 PI KAKZ Pgm Top 40 Group 0A PS = Iryonce Mono PI KAKZ Pgm Top 40 Group 2A RT: txt seg = 32, a/b = 1 RT A: Beyonce - Irreplaceable - KISS 108 - s RT B:Beyonce - Irreplaceable - KISS 108 - s PI KAKZ Pgm Top 40 Group 0A PS = Irrence Mono PI KAKZ Pgm Top 40 Group 8A UKN 1: 9 2: 197 3: 410c PI KAKZ Pgm Top 40 Group 0A So far I found one station has the traffic flag on all the time and the station I dumped above has the wrong PI set. Most Stations put the artist and title in a dynamic PS as above (A no-no in Europe). Several stations are broadcasting traffic information (AID = cd46). The factory radio in my car decodes RDS but after comparing the info the car radio does not display RT messages. 73 Eric _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
