AUDIO/VIDEO SIGNAL TRANSPORT PROCESSOR APPARATUS

摘要

PURPOSE: An audio/video signal transport processor apparatus is provided to process packets of program component data from a packet video signal and extract corresponding payloads of different program signal components. CONSTITUTION: A microprocessor(19) couples data to a common buffer memory data input port. Respective component payloads and data generated by the microprocessor(19) are stored in respective blocks of a common buffer memory(18) in response to associated memory address which are applied to a memory address input port by an address multiplexer(17). A decryption device(16) decrypts payload data according to packet specific decryption keys. In addition, a detector(15) detects payloads including entitlement data. Payloads containing entitlement data are directed via the common buffer memory(18) to a smart card which generates the packet specific decryption keys. A memory data output port is coupled to a bus interconnected with respective program component processors(21-24).