Method and apparatus for converting the sampling rates of a digital video signal

摘要

When processing a digital video signal, the problem often arises of converting the signal from a first sampling raster which is asynchronous with respect to the line interval to a second sampling raster which synchronous with the line interval. Interpolation filters are used for this purpose. The present invention provide a simple method for the conversion which does not require intermediate D/A or A/D conversion. For each line of the input signal, the phase of samples of the first sampling raster relative to the line synchronization pulse and the total number of the samples for this line are determined and are used to control of the interpolation filter.