Television receiver utilizing extended service information
A receiver for receiving television signals is arranged to receive signals in a plurality of channels. Each signal defines a television program and at least a signal in one of the channels comprises compressed data defining broadcast events in the channels from time to time. The receiver is arranged to produce output signals defining an image of events in the program schedule for displaying on a television screen. The receiver comprises means for receiving data defining a dictionary representing text portions, means for decoding the program scheduling data to identify text portions in the dictionary, and means for constructing the image of events from the identified text portions. A signal in each channel comprises a bouquet identity and a sub-bouquet identity for the channel. The receiver comprises means for storing a reference bouquet identity and one or more reference sub-bouquet identities, means for comparing the bouquet identity and sub-bouquet identity for a channel in a received signal with the reference bouquet and sub-bouquet identities and means for outputting the received television signal for display of the program or other services defined thereby depending on the comparison.
1. A receiver for receiving television signals in a plurality of channels each defining a television programme, wherein at least a signal in one of the channels includes compressed program schedule data defining broadcast events in the channels, and for producing output signals defining an image of the broadcast events in the programme schedule for displaying on a television screen, the receiver comprising:
means for receiving data defining two versions of a dictionary representing text portions,
means for expanding the programme schedule data by identifying corresponding text portions in the dictionary,
means for determining in which version of the dictionary the corresponding text portion is stored,
means for constructing the image of events using the identified corresponding text portions, and
means for storing only the most recently accessed version of the dictionary.
2. A receiver as claimed in claim 1 , wherein the text portions comprise an extended service description.
3. A receiver as claimed in claim 1 , wherein the text portions comprise an event name.
4. A receiver as claimed in claim 1 , wherein the text portions comprise a short event name.
5. A receiver as claimed in claim 1 , wherein the text portions comprise an extended event description.
6. A receiver as claimed in claim 1 , wherein the text portions comprise a special event message.
7. A receiver as claimed in claim 1 , comprising means for receiving the data of the other version of the dictionary and means for replacing the data of the one version of the dictionary in the storing means with the data of the other version of the dictionary when the data for the text portion is determined to be stored in the other version of the dictionary.
8. A receiver as claimed in claim 1 , further comprising means for storing a default dictionary.
9. A receiver as claimed in claim 2 , wherein the text portions comprise an event name.
10. A receiver as claimed in claim 2 , wherein the text portions comprise a short event name.
11. A receiver as claimed in claim 3 , wherein the text portions comprise a short event name.
12. A receiver as claimed in claim 9 , wherein the text portions comprise a short event name.
13. A receiver as claimed in claim 1 , wherein the most-recently accessed version of the dictionary is stored in a volatile memory.
14. A receiver as claimed in claim 13 , wherein the data defines a further dictionary that is stored in a non-volatile memory.
15. A receiver for receiving television signals in a first plurality of channels broadcast in a first broadcast network that include programme schedule data for the first network, for receiving television signals in a second plurality of channels broadcast in a second broadcast network that include programme schedule data for the second network, and for receiving programme schedule data broadcast in the first network at a faster rate than in the second network, the receiver comprising:
a cache store for storing a portion of programme schedule data for the first and/or the second network transmitted from time to time in at least one of the channels broadcast in the first network and/or the second network,
means for decoding the data in the cache store for display of a programme schedule of the first or second broadcast network, and
means for receiving and decoding additional programme schedule data from the first network for either of the first or second broadcast network, in response to a user request.
16. A receiver as claimed in claim 15 , wherein the data stored in the cache store is updated when new data is transmitted in the first or second network.
17. A receiver as claimed in claim 15 , wherein the broadcast programme schedule data comprises depth data for specific models of receiver, the receiver being arranged to receive depth data pertaining thereto, and the amount of data stored in the cache store is dependent on the depth data.
18. A receiver as claimed in claim 16 , wherein the broadcast programme schedule data comprises depth data for specific models of receiver, the receiver being arranged to receive depth data pertaining thereto, and the amount of data stored in the cache store is dependent on the depth data.