Coded data generation or conversion – Digital code to digital code converters – Data rate conversion
Reexamination Certificate
2006-09-05
2006-09-05
Williams, Howard L. (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
Data rate conversion
C708S313000
Reexamination Certificate
active
07102548
ABSTRACT:
We disclose a CIC digital filter having an arbitrary-integer decimation rate. The filter has a shifter connected to its input. The shifter receives a shift control input, where the shift control input is pre-computed as equal to the integer portion of 2 raised to the base-2 logarithm of the gain of the CIC filter. There is a multiplier connected between the input and the shifter. In other embodiments, the multiplier could be connected between the input and the shifter. Sequentially-connected integrator functions are connected to the shifter (or multiplier); a decimation function receives input from the integrator functions; and sequentially-connected differentiator functions receive input from the decimation function. The decimation function has a selectable rate equal to any integer between 1 and a number equal to the predetermined maximum decimation value. The multiplier is configured to compute the product of each input data sample by a correction factor; the correction factor being pre-computed as equal to the fractional portion of 2 raised to the base-2 logarithm of the gain of the CIC filter, so as to correct the gain of the CIC filter for decimation values not a power of 2.
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Elliott William D.
Meng Xiemei
Wang Shenq-Huey
Quickfilter Technologies, Inc.
Thomas John A.
Williams Howard L.
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