Patent ID: 7107300

Claim:
A digital signal system for determining an approximate antilog x from a value of ƒ(x), wherein x has a base b, the system comprising: circuitry for storing the value of ƒ(x) as a digital representation, wherein the value of ƒ(x) has an integer portion and a decimal portion; circuitry for setting a most significant digit bit position MSD of the approximate antilog x in response to the integer portion of ƒ(x), wherein adjacent the most significant digit bit position MSD is located a set of bits in respective lesser significant bit locations; a table for storing a set of predetermined logarithms having the base b, wherein each of the predetermined logarithms corresponds to a number in a set of numbers; and circuitry for determining a value for each bit in a first bit group of t bits in the set of bits in respective lesser significant bit locations in response to locating a predetermined logarithm in the table having a value relating to the value ƒ(x) minus (MSD−t) to determine said approximated antilog x from ƒ(x) wherein t is less than MSD.