Digital signal filtering method for telecommunication system, involves determining optimal filter based on criterion that depends on values of sub-signal, and associating optimal filter with context function corresponding to sub-signal

摘要

The method involves calculating a value of a context function from a set of context functions for samples to be filtered. The signal is divided into a set of sub-signals corresponding to the various values of the context functions. An optimal filter is determined for each sub-signal based on a criterion that depends on values of the sub-signal, and is associated with the context function corresponding to the sub-signal. Filtering is performed based on geometric orientations, and an optimal context function is selected from the context functions based on another predetermined criterion. Independent claims are also included for the following: (1) a device for filtering a digital signal (2) an information storage unit comprising instructions to perform a filtering method (3) a computer program product comprising sequences of instructions to perform a filtering method (4) a method for coding information representing geometric orientation of a filter (5) a device for coding information representing geometric orientation of a filter (6) an information storage unit comprising instructions to perform a method for coding information (7) a computer program product comprising sequences of instructions to perform a method for coding information.