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System for transferring data in re-assignable groups, a transmitter and a receiver for use in such a system, and a method for transferring, transmitting and receiving such data, and a signal comprising such data
| Details |
Inventors: Kamalski, Theodor I. E.;
Assignee: U.S. Philips Corporation (New York, NY)
Primary Examiner: Dinh; Dung C.
Assistant Examiner:
Attorney, Agent or Firm: Goodman; Edward W.
A system for transferring data in group, wherein groups have group identifiers for distinguishing groups comprising different data types. A group can be reassigned to carry a different type of data by transmitting in special groups having a predetermined group identifier, group identifiers and data type identifiers for linking respective group identifiers to respective data types. By transmitting a new data type identifier for certain group identifier that particular group is re-assigned to carry a new data type. This allows the use of a group for a plurality of data types, which is especially useful in the Radio Data System. |
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DETAILED DESCRIPTION An object of the invention is to allow the transmission of more different data types in a system according to the preamble, than can be addressed with the group identifier.
A system according to the invention is characterized in that at least one of said groups, being identified by a predetermined group identifier, comprises linking information for linking a further group identifier to a data type.
By linking a data type to a group identifier according to the invention, it is possible for a broadcaster to determine by himself which services or data types can be transferred in the system as he is no longer restricted by a fixed allocation of a data type (or service) to a particular group identifier.
By reserving a predetermined group identifier for transferring this linking information, a receiver can determine in an easy way which services or data types are provided by the system.
The receiver only has to monitor those groups, being identified by the predetermined group identifier, in order to receive all the linking information relating to the system.
A further advantage is now that it is also possible to link one data type to more than one group identifier, thereby increasing the data capacity for that particular data type.
An embodiment of a system according to the invention is characterized in that the linking information comprises a group identifier indicator and a data type identifier for linking the data type identified by the data type identifier to a group identified by the further group identifier, indicated by the group identifier indicator.
This is an advantageous implementation for providing the linking information.
The use of a group identifier indicator allows less space to be taken if not all group identifiers can be linked to a data type, but only a (limited) selection thereof.
An embodiment of a system according to the invention is characterized in that at least one of said groups, being identified by a predetermined group identifier, comprises a group identifier indicator and a data type identifier for linking a data type identified by the data type identifier to a group identified by a further group identifier, indicated by the group identifier indicator
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