Filtering method and A/D conversion apparatus having filtering function
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United States of America Patent
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Nov 25, 2003
Grant Date -
Feb 6, 2003
app pub date -
Jul 29, 2002
filing date -
Jul 31, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
In an A/D conversion apparatus comprising an A/D converter (4) and a digital moving average filter (6) for removing high-frequency signal components, there is provided an analog moving average filter (2) at a first stage. A sampling frequency of the filters (6 and 2) is set to fsd=n.times.fsa (where n is a positive integer of 1, 2, ---). As a result, it becomes possible to superimpose an unnecessary signal passing area that appears at every frequency of n times the sampling frequency fsd in the filter (6), on an area of infinite attenuation that appears at every frequency of n times the sampling frequency fsa in the filter (2). In the apparatus as a whole, it becomes possible to efficiently attenuate unnecessary high-frequency signal components. It is also possible to obtain a similar effect when a time A/D converter is used in place of the analog moving average filter (2) and the A/D converter (4).
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