Fractional delay filter-based beamformer apparatus using post filtering
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United States of America Patent
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May 8, 2012
Grant Date -
Jul 10, 2008
app pub date -
Dec 6, 2007
filing date -
Dec 15, 2006
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Abstract
A beamforming apparatus is provided for improving beamforming accuracy by employing fractional delay filters in an interpolation process and reducing hardware complexity by using post-filtering technique. The beamforming apparatus of the present invention includes a post-filtering means implemented with fractional delay filters that combines block data, on the respective channels, supposed to be fractionally delayed and obtains a delay value of fractional part from the combined data. The post-filtering means collects the block data of the channels assigned identical coefficients and performs a filtering process simultaneously.
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