US 6,983,012 B1
Implementation of digital filter with reduced hardware
Jiang Shen, Anhui (China)
Assigned to Golden Bridge Technology Incorporated, Long Branch, N.J. (US)
Filed on Jul. 26, 2001, as Appl. No. 9/912,452.
Claims priority of provisional application 60/222666, filed on Aug. 03, 2000.
Int. Cl. H03H 7/30 (2006.01); H04B 1/10 (2006.01); G06F 17/10 (2006.01)
U.S. Cl. 375—229 12 Claims
OG exemplary drawing
 
1. A method of digital filtering of a digitized input stream in accordance with a predetermined filter function approximating a sum of products of a series of one or more first coefficient values and a series of one or more delayed samples from a digital output stream added together with a sum of products of a series of one or more second coefficient values and a series comprising one or more samples from the digital input stream, the digital filtering method comprising the steps of:
combining predetermined sets of one or more samples from the digital input stream and one or more samples from the digital output stream, to form a plurality of respective numeric input values;
scaling each of the plurality of respective numeric input values by a different power of a base numeric value for the digital filtering, to form a respective one of a plurality of scaled values; and
adding the scaled values together to form the digital output stream in accordance with the predetermined filter function.