RDS radio system
US5239681A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1991 |
| Grant date | Aug 24, 1993 |
| Priority date | — |
| Expiry date | Aug 8, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H2201/40
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A radio data system transmits message groups comprising four blocks of which the first block always carries the program identification code for the transmitting network (P1(TN)). One type of message group, identified by a corresponding group type code (GT) in a second block always carries a program identification code for another network (PI(ON) in a fourth block and carries various corresponding items of information in a third block. Which of these various items is in the third block is identified by a user code (UC) in the second block. The items of information in the third block may in particular include alternative frequency codes for the other network identified in the fourth block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.