Patent ID: 8718289
Filing Date: 2014-05-06
Classification: G10K

Abstract:
1. An active noise control system comprising: a computer device, a plurality of adaptive filters included in the computer device, each of the adaptive filters configured to receive an identical first input signal representative of an undesired sound and to receive a respective update signal that is different for each respective adaptive filter, where each of the adaptive filters are configured with a respective different filter length so that corresponding frequency ranges of the respective adaptive filters are different but overlapping, the respective different filter lengths of the adaptive filters configured to converge at different rates and generate respective output signals based on a frequency range of the first input signal, and a plurality of learning algorithm units included in the computer device and configured to all commonly and directly receive an identical error signal and an identical second input signal, and independently generate respective update signals for each of the respective adaptive filters using said identical error signal, where each of the respective output signals is independently adjusted by the respective adaptive filters based on the respective update signal received from a corresponding one of the learning algorithm units, and where the respective output signals are summed to form an anti-noise signal configured to drive a speaker to produce sound waves to destructively interfere with the undesired sound.