Patent ID: 7342983

Claim:
A digital filtering apparatus for use with a data signal line, comprising: a digital delay element that receives data from a data signal line, the digital delay element having a plurality of delay components and at least one output; a comparator operably connected to the at least one output of the digital delay element in such a way that the comparator compares the output of each of the plurality of delay components, the comparator having an output; and a final stage operably connected to the output of the digital delay element and the output of the comparator, wherein the comparator, upon recognizing invalid data clocking through the digital delay element by determining that the output of each of the plurality of delay components are not the same logical state, enables the final stage to filter the data and wherein the comparator, upon recognizing valid data clocking through the digital delay element by determining that the output of each of the plurality of delay components are the same logical state, enables the final stage wherein the output of the final stage changes logical state for a duration approximately equal to that of the valid data.