초록 ▼

A coefficient updating method stops updating filter coefficients for a plurality of adaptive filters when a convergence condition is achieved. Active noise control within a system simulates an original noise signal with a simulated noise signal which is equal and opposite to the original noise signa

A coefficient updating method stops updating filter coefficients for a plurality of adaptive filters when a convergence condition is achieved. Active noise control within a system simulates an original noise signal with a simulated noise signal which is equal and opposite to the original noise signal. To detect feedback in such a system, a reference signal or “white noise”is generated by a speaker, transmitted through the system and received by a microphone. Coefficients of multiple filters such as an anti-feedback filter, a C filter, and a noise control filter are then updated to minimize adverse parameters such as original noise and feedback. Coefficient updating of the adaptive filters is stopped when a minimum average value is reached.

대표청구항 ▼

An adaptive filter coefficient updating method comprising the steps of: inputting a reference signal from a reference signal generator to a transmission system and a first filter; subtracting an output of the first filter from the transmitted reference signal to determine an error signal; updating c

An adaptive filter coefficient updating method comprising the steps of: inputting a reference signal from a reference signal generator to a transmission system and a first filter; subtracting an output of the first filter from the transmitted reference signal to determine an error signal; updating coefficients of the first filter in response to the error signal; inputting the error signal into an estimation scattering filter; updating coefficients of the estimation scattering filter to simulate the transmission system; and stopping coefficient updating of said estimation scattering filter when the error signal reaches a minimum value.