Method and apparatus for converting the sampling rates of a digi

Details Method and apparatus for converting the sampling rates of a digi Method and apparatus for converting the sampling rates of a digi

1993-02-08

1994-11-22

Groody, James J.

Television

Synchronization

Automatic phase or frequency control

348523, 348536, H04N 701, H04N 704, H04N 504

Patent

active

053673387

ABSTRACT:
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.

REFERENCES:
patent: 4438452 (1984-03-01), Powers
patent: 4455611 (1984-06-01), Powers
patent: 4550335 (1985-10-01), Powers
patent: 4568965 (1986-02-01), Powers
patent: 4612573 (1986-09-01), Grallert et al.
patent: 4792856 (1988-12-01), Shiratsuchi
patent: 5068716 (1991-11-01), Takayama et al.
patent: 5121207 (1992-06-01), Herrmann

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