Patent ID: 8116481
Filing Date: 2012-02-14
Classification: H03G,H04R

Abstract:
1. An audio enhancement system for compensating for ambient noise in a listening environment, comprising: a transducer that receives an electrical sound signal and generates a sound output from the electrical sound signal; a sensor that obtains a total sound signal representative of the total sound level in the listening environment, where the total sound level comprises both the sound output from the transducer and the ambient noise within the listening environment; a filter responsive to the total sound signal and to a reference signal derived from the electrical sound signal, that extracts an ambient noise signal representative of the ambient noise in the environment from the total sound signal, where the filter comprises an adaptive filter with an adaptive step size; a controller responsive to the ambient noise signal and that generates a control signal; an equalizer responsive to the control signal and that adjusts the sound output of the transducer to compensate for the ambient noise level; and a step size calculation unit that controls the adaptive step size of the adaptive filter; where the electrical sound signal is derived from an output of the equalizer, and the step size calculation unit controls the adaptive step size in response to a mean reference signal, an estimated system distance, and a mean error signal.