Filter combination for sampling rate conversion
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United States of America Patent
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Oct 24, 2000
Grant Date -
N/A
app pub date -
Jul 2, 1998
filing date -
Jul 2, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A filter combination for sampling rate conversion is disclosed comprising a series combination of: an input low-pass filter (1) whose attenuation characteristic (tp1) has at least one first attenuation value (a1) in the vicinity of one-half and 1.5 times the frequency of a digitization clock (f1); a time-invariant interpolation filter (2) for increasing the number of samples from that of the first data sequence (d1) by an integral factor whose attenuation characteristic (tp2) has at least one second attenuation value (a2) in the vicinity of the frequency of the digitization clock (f1) and essentially at least one third attenuation value (a3) in the region between one-half and 1.5 times the frequency of the digitization clock; and a time-varying interpolation filter (3) for interpolating a data sequence (d5) provided at the output of the time-invariant interpolation filter (2), the attenuation characteristic (tp3) of the time-varying interpolation filter (3) having at least one fourth attenuation value (a4) in the vicinity of twice the frequency of the digitization clock (f1).
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