Patent ID: 8688758

Claim:
A method of filtering an input signal x(k) to produce an output signal y(k) such that the ratio of a power level of the output signal to a power level of the input signal is substantially equal to a desired value Î³, the method comprising, at least one of which is performed by a processor: forming a first corrected frequency response H (Ï‰) based on a first correction value g corr (0) and a desired frequency response H(Ï‰); forming a first filter h (z) from the first corrected frequency response H (Ï‰); applying the first filter h (z) to a first block of the input signal to produce a first output signal block; computing an amplification Î³ caused by the application of the filter h (z); computing a value Î³ diff , wherein Î³ diff represents an amplification error; computing a second correction value g corr (1), where g corr (1) is a function of g corr (0) and Î³ diff ; forming a second corrected frequency response H (Ï‰) based on the second correction value g corr (1) and the desired frequency response H(Ï‰); forming a second filter h (z) from the second corrected frequency response H (Ï‰); and applying the second filter h (z) to a second block of the input signal to produce a second output signal block.