Patent ID: 8625813

Claim:
A method for enhancing an audio signal, the method comprising: providing a plurality of multiplier circuits; providing a plurality of adder circuits; providing a plurality of scalar values; providing at least one divider circuit, wherein the plurality of multiplier circuits, the plurality of adder circuits, the plurality of scalar values and the at least one divider circuit are configured according to: x p = x r x 2 ⁢ ⁢ p = x · x p x 3 ⁢ ⁢ p ⁢ ⁢ 2 = x 2 ⁢ ⁢ p · x p x 4 ⁢ ⁢ p ⁢ ⁢ 3 = x 3 ⁢ ⁢ p ⁢ ⁢ 2 · x p f ⁡ ( x ) = { k p ⁢ r , x ≥ r a p ⁢ x 4 ⁢ ⁢ p ⁢ ⁢ 3 + b p ⁢ x 3 ⁢ ⁢ p ⁢ ⁢ 2 + c p ⁢ x 2 ⁢ ⁢ p + x , 0 ≤ x < r a n ⁢ x 4 ⁢ ⁢ p ⁢ ⁢ 3 + b n ⁢ x 3 ⁢ ⁢ p ⁢ ⁢ 2 + c n ⁢ x 2 ⁢ ⁢ p + x , - r < x < 0 k n ⁢ r , x ≤ - r wherein x is a bass acoustic signal, f(x) is an output signal, r is a smoothed peak level, and a p , b p , c p , a n , b n , c n k p and k n are scalar values; and wherein the plurality of multiplier circuits, the plurality of adder circuits, the plurality of scalar values and the at least one divider circuit are configured for: receiving a bass audio signal having a fundamental frequency; normalizing an amplitude of the bass audio signal; and producing a plurality of harmonics using a monotonic, asymmetric polynomial distortion function applied to the normalized bass audio signal.