摘要:
A device for use in a receiver/decoder operable with different conditional access systems, the receiver/decoder including means for manipulating data received by the receiver/decoder according to a manipulation protocol which is configurable in dependence on the conditional access system, and means for storing parameters associated with the manipulation protocol, the device comprising: means for receiving a command instructing configuration of the manipulation protocol in dependence on the conditional access system; means for retrieving a parameter from the storing means in dependence on the command; and means for outputting said parameter to the manipulation means for use in configuring the manipulation protocol, whereby the manipulation means is not required to receive all parameters necessary to configure the manipulation protocol for all of the conditional access systems.
摘要:
In a memory in a computer system, buffers are defined by a buffer management system. A set Buffers command defines a number (NP) of pools of buffers, and for each pool, a pool size (PS) of the number of buffers in the pool and the size (BS) of the buffers in that pool. The buffer management system is initialized to store the buffer sizes and to cumulate and store the pool sizes. To address a buffer, the buffer management system determines the address of the start of the buffer from the desired pool and buffer numbers, using the stored information. Also, for updating a paged flash memory, a page Pn of the flash memory (4024) is copied as an image page into RAM memory (4022), and the image page is updated and written back into a different page in the flash memory. A main record table (22) is held in a separate non-volatile memory (EEPROM 4026), identifying valid page pages in the flash memory, and is updated when a page in the flash memory has been updated. The main record table includes a CRC error detection section (25), and is copied into a back-up record table (23) immediately after it has been updated.
摘要:
A method of transmitting data to a receiver/decoder comprises: transmitting first type visual and/or audio data to the receiver/decoder; and transmitting second type reference data associated with the first type visual and/or audio data to the receiver/decoder to enable the receiver/decoder to generate further visual and/or audio data in dependence on the reference data; wherein the first type data and the second type data have a predetermined timing relationship.
摘要:
A device interface for use in a receiver/decoder (2020) for a broadcast digital television system in which received signals are passed through a receiver to the receiver/decoder and thence to a television set (2022). The receiver/decoder decodes a compressed MPEG-type signal, and is controlled by a remote controller handset (2026), through an interface in the receiver/decoder. The operation of the receiver/decoder is controlled by a virtual machine (VM) which includes a run time engine (RTE) (4008). The receiver/decoder includes a plurality of interfaces to external units. The device interface enables an application run by the RTE to access an IEEE 1394 interface.
摘要:
A method of filtering a packet data stream as transmitted in a digital audiovisual transmission system characterised in that transport packet data is filtered at a first stage by a digital filter (42) according to the characteristics of the transport packet header, selected filtered data being then passed directly to a memory element (44) within the receiver/decoder. In a second aspect, the method comprises filtering a packet data stream characterised in that transport packet data is filtered at a first stage by a first digital filter (42) according to the characteristics of the transport packet header, selected filtered data from the payload corresponding to a continuous flux of data then being passed to a second digital filter (45) for a second stage of filtering.
摘要:
In a digital television system, a receiver/decoder (or "set-top-box") can download one of more of several applications which can be run by the receiver/decoder to provide interactivity with the user. The applications include: an Internet browser application which uses a PSTN connection to make Internet requests and the television signal path to receive Internet responses; a shopping application operable in an "impulse" mode and a "catalogue" mode; a banking application; a quiz application which runs in synchronism with a quiz television programme; a magazine browser application; and a weather or traffic application.