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14.2.6 Example of ODA user defined group coding (Radiotext Plus)
Let’s show the group coding example on the popular RT+ service. We need to insert group type 3A (Application
identification for ODA) to the RDS stream pointing to the RT+ service which is – in this example - carried in group
11A.
Let's assume following RT content: Enigma - The Eyes of Truth
Appropriate 3A and 11A groups have following structure and coding:
Group 3A
Let's assume following variable values:
AGT: group type 11, version A (0), rfu: reserved, set as zeros, CB flag: 0, SC flag: 0, TN: N/A, set as zeros, AID
code is 4BD7 for the RT+ service.
Blocks 2 to 4 in binary representation:
0011 0000 0001 0110 | 0000 0000 0000 0000 | 0100 1011 1101 0111
Blocks 2 to 4 in hexadecimal representation:
3016 | 0000 | 4BD7
Group 11A
Let's assume following variable values:
AGT: group type 11, version A (0), ITG: 0, IRB: 1, RTCT1: 1 (Title), SM1: 9 (10th RT character), LM1: 16 (17
characters long), RTCT2: 4 (Artist), SM2: 0 (first RT character), LM2: 5 (6 characters long).
Blocks 2 to 4 in binary representation:
1011 0000 0000 1000 | 0010 0100 1010 0000 | 0010 0000 0000 0101
Blocks 2 to 4 in hexadecimal representation:
B008 | 24A0 | 2005
Inserting the RT+ groups using the UDG1 command:
UDG1=301600004BD7,B00824A02005
Note:
This example is for illustration only. The RT+ feature is directly supported by the RDS encoder (see section 11.7).
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