Ripple elimination filter
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United States of America Patent
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Issued Date -
Jan 26, 2006
app pub date -
Jul 20, 2004
filing date -
Jul 20, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method for removing a step response ripple from a digital signal is accomplished by passing the digital signal through a low pass filter and a decimation filter forming a resultant signal, and filtering the resultant signal with a 4-tap Finite Impulse Response filter (FIR), wherein when half a sampling frequency is normalized as 1, the FIR has a transition band of greater than or equal to 0.1 of the normalized frequency resulting in a signal without a step response ripple.
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