Sampling rate conversion using polyphase filters with interpolation
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United States of America Patent
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Dec 28, 1993
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N/A
app pub date -
Oct 23, 1992
filing date -
Oct 23, 1992
priority date (Note) -
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Abstract
A sampling rate converter for converting an input digital signal, such as D2 PAL, into an output digital signal, such as D1 PAL, has a pair of polyphase filters. The input digital signal is input in parallel to the two polyphase filters, with the phase selected by one of the filters being offset by one from that of the other. The outputs of the polyphase filters are input to a linear interpolator to produce the output digital signal. The resolution of the sampling rate conversion is a function of the number of phases N of the polyphase filters and the number of interpolation steps M of the interpolator.
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