Research Of RDS/RBDS Pre-Processor

German made an air information system for drivers in 1970s.AIS can distinguish all meter lengths in FM broadcasting, so the problem of tuning radios again because of the small transmitters' service during driving cars is well done. The function of this system is very small, and can not be satisfied well. European broadcasting league was founded and made the radio data system (RDS). In the following it promulgated the first technology rules of RDS. The RDS technology is mature, and RDS and involving products have formed tens of billion sell scale in a year. America has established the similar of radio broadcasting data system (RBDS).FM lengths of the receiver are from 87.5 to 108.0MHz. The nearing radio length is at least 100 KHz. The data of RDS is included in 57 KHz. The RDS/RBDS system offers a large range of applications by its many functions to be implemented. For car radios the most important are: program service name, traffic program identification, traffic announcement signal, alternative frequency list, program identification, enhanced other networks information.The thesis introduces a chip of RDS/RDBS pre-processor. The high frequency receiver receives radio signal. Compared with standard radio systems, RDS/RBDS controlled radio systems additional require an RDS/RBDS demodulator with a 57KHz switched capacitor band-pass filter information about the current reception situation (reception quality, multi-path disturbance etc.),and additional microcontroller power for RDS/RBDS data processing, decoding and radio control.The new RDS/RBDS pre-processor includes all these specific functions and meets all requirements of a high end RDS/RBDS radio. Moreover the timing requirements of the set controller, regarding RDS/RBDS data processing are reduced due to the integration of decoder functions, so that the development of radio control software can be concentrated specifically on radio set features.