Method for the removal of artefacts from a transmitted digital audio/video signal

摘要

A method is described which makes use of a combination of known error correction techniques and the processing of encrypted messages to allow an authorised receiver to eliminate any potential artifacts from a transmitted digital data stream. The method is of particular use in the pay-TV industry where the encrypted messages are based on the commonly used entitlement management message (EMM) protocol, said messages being used to pass on information allowing a solution to a specified error correction algorithm to be found, thus allowing an authorised receiver to remove artifacts from a received signal which may include a noise component either intentionally added or otherwise.