Abstract: A networked Conditional Access Module provided on an IEEE 1394 network, by defining a Conditional Access Module as a Conditional Access Subunit of the IEEE 1394 network, providing AV/C Conditional Access Commands to allow communication between the Conditional Access Subunit and other Subunits on the network, the Conditional Access Subunit including means to receive AV/C Conditional Access Commands over the IEEE 1394 network from another subunit, and means to transmit AV/C responses over the IEEE 1394 network in response to the received AV/C Conditional Access Commands.

Abstract: A networked Conditional Access Module provided on an IEEE 1394 network, by defining a Conditional Access Module as a Conditional Access Subunit of the IEEE 1394 network. There is provided an AV/C Conditional Access Commands to allow communication between the Conditional Access Subunit and other Subunits on the network. The Conditional Access Subunit is configured to receive AV/C Conditional Access Commands over the IEEE 1394 network from another subunit, and means to is also configured to transmit AV/C responses over the IEEE 1394 network in response to the received AV/C Conditional Access Commands.

Abstract: A system for providing requested data sets of broadcast data service transmitted as part of a broadcast signal, including a broadcast headend configured to receive a data request from a receiver, and configured to broadcast requested data sets to the receiver in response to the data request from the receiver, a processor configured to periodically extract all of the requested data sets of the broadcast data service from a broadcast carousel included in the broadcast signal, a memory configured to store all of the requested data sets of the broadcast data service, defining a plurality of digital-audio/video-data-sets including television clips, a first controller configured to allow selection from a list of the plurality of sets of the digital-audio/video-data-sets, and a second controller responsive to a user initiated selection signal to cause the memory to output a user selected one of the plurality of digital-audio/video-data sets selected from the list, wherein the processor converts the digital-audio/vid

Abstract: A system for providing a plurality of sets of broadcast data service transmitted as part of a broadcast signal, including a processor configured to periodically extract at least some of the plurality of sets of the broadcast data service from a broadcast carousel included in the broadcast signal, a memory configured to store the extracted plurality of sets of the broadcast data service, defining a plurality of digital-audio/video-data-sets including television clips, a first controller configured to allow selection from a list of the plurality of sets of the digital-audio/video-data-sets, and a second controller responsive to a user initiated selection signal to cause the memory to output a user selected one of the plurality of digital-audio/video-data-sets selected from the list, wherein the processor converts the digital-audio/video-data of the plurality of sets of the broadcast data service into real time audio/video data, and updates portions of data related to the stored extracted plurality of sets.

Abstract: A system for providing a plurality of sets of broadcast data service transmitted as part of a broadcast signal, including a processor configured to periodically extract at least some of the plurality of sets of the broadcast data service from a broadcast carousel included in the broadcast signal, a memory configured to store the extracted plurality of sets of the broadcast data service, defining a plurality of digital-audio/video-data-sets including television clips, a first controller configured to allow selection from a list of the plurality of sets of the digital-audio/video-data-sets, and a second controller responsive to a user initiated selection signal to cause the memory to output a user selected one of the plurality of digital-audio/video-data-sets selected from the list, wherein the processor converts the digital-audio/video-data of the plurality of sets of the broadcast data service into real time audio/video data, and updates portions of data related to the stored extracted plurality of sets.

Abstract: A system for providing requested data sets of broadcast data service transmitted as part of a broadcast signal, including a broadcast headend configured to receive a data request from a receiver, and configured to broadcast requested data sets to the receiver in response to the data request from the receiver, a processor configured to periodically extract all of the requested data sets of the broadcast data service from a broadcast carousel included in the broadcast signal, a memory configured to store all of the requested data sets of the broadcast data service, defining a plurality of digital-audio/video-data-sets including television clips, a first controller configured to allow selection from a list of the plurality of sets of the digital-audio/video-data-sets, and a second controller responsive to a user initiated selection signal to cause the memory to output a user selected one of the plurality of digital-audio/video-data sets selected from the list, wherein the processor converts the digital-audio/vid

Abstract: A technique for broadcasting a broadcast data service together with broadcast digital television data as part of a broadcast signal, the broadcast data service comprising a plurality of data portions including data portions having digital data in non-real time. The technique comprising, during normal broadcasting, only broadcasting portions of the broadcast data service required to replace previous respective portions which have been changed and broadcasting television data of the broadcast data service as non-real time data.

Abstract: A networked Conditional Access Module provided on an IEEE 1394 network, by defining a Conditional Access Module as a Conditional Access Subunit of the IEEE 1394 network, providing AV/C Conditional Access Commands to allow communication between the Conditional Access Subunit and other Subunits on the network, the Conditional Access Subunit including means to receive AV/C Conditional Access Commands over the IEEE 1394 network from another subunit, and means to transmit AV/C responses over the IEEE 1394 network in response to the received AV/C Conditional Access Commands.

Abstract: A method of transmitting a transport stream over an IEEE 1394 Serial Bus comprising stripping out of the transport stream identifiable unrequired data so as to reduce the bandwidth of the transport stream, a digital multi-media receiver for transmitting a transport stream to a Conditional Access Module on an IEEE 1394 Serial Bus including a reader for reading the contents of the transport stream and identifying data which is not required for processing by a Conditional Access Module, a stripper for stripping out at least some of the identified unrequired data from the transport stream and a transmitter for transmitting all of the remaining data of the transport stream which has not been stripped and a network of digital multi-media devices connected by means of an IEEE 1394 Serial Bus whereby a first device sends such a stripped transport stream to a second device over the IEEE 1394 Serial Bus.

Abstract: A method of receiving and demodulating a plurality of digital signals transmitted with different respective carrier frequencies and a digital receiver for receiving and demodulating a plurality of digital signals transmitted with different respective carrier frequencies wherein the carrier frequency signals are down converted to respective base-band signals and digitized and a common demodulator is provided to demodulate the respective digitized base-band signals in a time division manner.

Abstract: A digital video receiver, a conditional access module and method of transmitting data therebetween, the digital video receiver having a multi line socket for connection to the conditional access module, the socket having a pre-determined plurality of lines for transmitting and receiving transport stream data and a pre-determined plurality of lines for transmitting and receiving control data and resource/application data, the method comprising selectively transmitting resource/application data over the plurality of transport stream lines.

Abstract: A method of transmitting a transport stream over an IEEE 1394 Serial Bus comprising stripping out of the transport stream identifiable unrequired data so as to reduce the bandwidth of the transport stream, a digital multi-media receiver for transmitting a transport stream to a Conditional Access Module on an IEEE 1394 Serial Bus including a reader for reading the contents of the transport stream and identifying data which is not required for processing by a Conditional Access Module, a stripper for stripping out at least some of the identified unrequired data from the transport stream and a transmitter for transmitting all of the remaining data of the transport stream which has not been stripped and a network of digital multi-media devices connected by means of an IEEE 1394 Serial Bus whereby a first device sends such a stripped transport stream to a second device over the IEEE 1394 Serial Bus.

Abstract: An interface for connecting one or more conditional access modules to a receiver, the interface including a plurality of interface sections, each for connection with a respective socket for receiving a conditional access module and each having a plurality of input lines and a plurality of respective output lines for connection to said socket, the interface sections being arranged in series, with the input lines of one interface section being connected to the respective output lines of the next interface section and with each interface section including an electronically controllable switch connecting the output lines of that interface section to the input lines of the same interface section, such that each socket may be selectively by passed.