DRM SDC

SDC contains information about the services available and how to decode the MSC. SDC is transmitted at the beginning of each ‘super-frame’ every 1.2 seconds. Primarily intended to give the listener information about the tuned DRM radio station, similar in operation to VHF-RDS. Includes the radio station name (up to 16 characters), alternate frequency and schedule information, target coverage area, time and date.

The SDC uses either 16-QAM or 4-QAM mapping. 16-QAM provides greater capacity whereas 4-QAM provides a more robust error performance. SDC is transmitted with a fixed code rate.

There are 13 different SDC data entities defined -

multiplex description data entity - type 0
service label data entity - type 1
conditional access parameters data entity - type 2
frequency information data entity - type 3
frequency schedule data entity - type 4
application information data entity - type 5
announcement support and switching entity - type 6
region definition data entity - type 7
time and date information data entity - type 8
audio information data entity - type 9
FAC channel parameters data entity - type 10
linkage data entity - type 11
language and country data entity - type 12