Diferencias Rds Y Rbds

NATIONAL RADIO SYSTEMS COMMITTEE

2500 Wilson Boulevard Arlington, VA 22201 (703) 907-7500 FAX (703) 907-7501

1771 N Street, NW Washington, DC 20036 (202) 429-5346 FAX (202) 775-4981

RBDS versus RDS - What are the differences and how can receivers cope with both systems?

Scott Wright (Delco Electronics Corp.) January 1998

I.

Introduction

The newly revised RDS and RBDSstandards move forward into a new era for FM data services. All changes have been devised to be fully backwards compatible with the prior standards while offering a tremendous amount of growth. Figure 1 depicts the actual construction of the RBDS standard. The RDS standard is entirely contained within the RBDS standard with functional differences added within the appropriate sections of the text(modified) or within entirely new sections or annexes (new). This reflects the fact that the functional core of RBDS and RDS are identical. This can especially be seen by examining the RDS group allocations shown in Figure 2.

Since the introduction of the Radio Broadcast Data System (RBDS) standard in North America in 1993, much activity has surrounded the introduction of the system by bothbroadcasters and receiver manufacturers alike. One of the largest activities undertaken was the upgrade of the standard which took place over the past several years. This paper discusses the remaining differences between the North American RBDS standard and the European RDS standard. Recent changes1 to both standards have resulted in greater harmonization of features, allowing the development of globalbroadcast equipment, consumer receivers, and data services.

NEW
NRSC RBDS Standard CENELEC RDS Standard EN50067 1997 Placeholder for AM RDS

NEW
In-Receiver Database System

MODIFIED
PI Codes for North America

MODIFIED
PTY Codes for North America

NEW
Specification for MMBS radio paging

NEW
Emergency Alert System ODA

=
1997

+
Section 6

+
Section 7 & Annex R

+
AnnexD

+
Annex F

+
Annex P

+
Annex Q

Figure 1 - RBDS Standard Functional Diagram

1

At the time of writing both standards are in final ballot procedure. Final approval is expected early in 1998. 2

Group type 0A 0B 1A 1B 2A 2B 3A 3B 4A 4B 5A 5B 6A 6B 7A 7B 8A 8B 9A 9B 10 A 10 B 11 A 11 B 12 A 12 B 13 A 13 B 14 A 14 B 15 A 15 B

Description of Use Basic tuning and switchinginformation only Basic tuning and switching information only Program Item Number and slow labeling codes only Program Item Number Radiotext only Radiotext only Applications Identification for ODA only Open Data Applications Clock-time and date only Open Data Applications Transparent Data Channels (32 channels) or ODA Transparent Data Channels (32 channels) or ODA In House applications or ODA In Houseapplications or ODA Radio Paging or ODA Open Data Applications Traffic Message Channel or ODA Open Data Applications Emergency Warning System or ODA Open Data Applications Program Type Name Open Data Applications Open Data Applications Open Data Applications Open Data Applications Open Data Applications Enhanced Radio Paging or ODA Open Data Applications Enhanced Other Networks information onlyEnhanced Other Networks information only Undefined2 Fast switching information only

Figure 2 RDS/RBDS Data Groups

2

It should be noted that the Fast PS feature of RBDS is being phased out of use.

3

II.

Summary of Differences 5. Mobile Broadcast Service (MBS) / Modified Mobile Broadcast Service (MMBS) - MBS is the predecessor system to RDS in Europe. It is used as a commercialnationwide paging system in the United States. Since it shares the same modulation format as RDS, it may be time multiplexed with RDS. 6. ID Logic Feature (IDL) / RDS Updates to In Receiver Database (IRDS) - A licensed feature which allows the receiver to identify

Recognition of the differences between RDS and RBDS is essential to all manufacturers. Depending upon the feature set of a particular...