This signal correspond to numerical data to send (RDS data ), each structures included 4 blocks. Each block comprises a 16 bits information word and a 10 bits checkword.

This signal is synchronised on basic clock 1187.5 Hz

This signal correspond to RDS data after differential encoding

Differential encoder included a D gate and a XOR gate.

A NRZ encoder (Non Return to Zero) is applied to the signal following the differential encoder.

Following the NRZ encoder, a Td/2 delay is adding. This delay correspond to the half of basic clock time 1187.5Hz.The not delayed signal has to be ading to delayed signal with inverted sign.

At end processing, a cos(¶FTd/2) filter, allow filtering harmonis genrated by previous steps.

The last step consist of modulating signal with ubcarrier 57KHz, deleting this carrier, and adding this signal to stereo multiplex to obtain full signal.