Asynchronous crosstalk cancellation

摘要

A device for delivering a data signal at a data rate has crosstalk cancellation. The crosstalk reducing unit ( 14 ) has an adaptive filter ( 15 ) to generate a crosstalk signal corresponding to a track adjacent to a track being scanned. A subtractor ( 16 ) subtracts the crosstalk signal from a read signal. A calculating unit ( 17 ) calculates filter coefficients for the adaptive filter. The adaptive filter ( 15 ) and subtractor ( 16 ) are coupled to an asynchronous clock ( 18 ) for operating at an asynchronous sample rate. The crosstalk reducing unit ( 14 ) has a sample rate converter ( 19 ) coupled to a synchronous clock for converting the output of the subtractor to the data signal ( 8 ) at a synchronous sample rate. A timing recovery unit ( 11 ) is coupled to the data signal ( 8 ) for retrieving the synchronous clock corresponding to the data rate. This has the advantage that the latency introduced by the crosstalk cancellation processing doesn't contribute to the overall delay of the timing recovery loop, while the latter still profits from the crosstalk cancellation.