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US 2006/0053186 A1Published application
Methods and systems for efficient filtering of digital signals
AssigneeGeneral Instrument Corporation
InventorChanchal Chatterjee
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Abstract
A method in a signal processor for filtering samples in a digital signal is provided. An approximate filtered sample is generated as a function of eight samples of the digital signal. A correction is generated as a function of the eight samples, and a filtered sample is generated by modifying the approximate filtered sample with the correction.
Claims1
A method in a signal processor for filtering samples in a digital signal, the method comprising:
- generating M1=(A+B+1)>>1, wherein A and B are samples in the digital signal;
- generating M2=(C+D+1)>>1, wherein C and Dare samples in the digital signal;
- generating M3=(E+F+1)>>1, wherein E and F are samples in the digital signal;
- generating M4=(G−1−H+1)>>1, wherein G and H are samples in the digital signal;
- generating NI=(M1+(M3>>1)+(M3>>2))>>2;
- generating N2=(M2+(M2>>1)+(M4>>2))>>2;
- and
- generating a filtered sample as M1+N1−N2.
5 more elements
Dependencies are inferred from the claim text.