Increasing precision in multi-stage processing of digital signals
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United States of America Patent
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Feb 7, 2006
Grant Date -
Jan 23, 2003
app pub date -
Mar 6, 2002
filing date -
Jun 15, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Precision of multi-stage digital signal processing is increased by preserving least significant bits of one or more output samples of a particular processing stage, having finite word widths, while avoiding the loss of most significant bits. The technique is applicable to one or more stages of multi-stage digital signal processing, thereby increasing precision therein and the signal-to-noise ratio. A plurality of output samples are calculated using a plurality of input samples, and the dynamic range of one or more of the output samples is decreased if the output sample can be represented in a smaller dynamic range without losing a significant bit. The input samples of a particular stage, obtained from the output samples of a previous stage, may further be normalized so that the input samples are represented in the same dynamic range before being processed.
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