To provide an active noise control system capable of producing an anti-noise signal for driving a speaker so as to produce acoustic waves which interfere with undesired sound existing in an objective space in such a manner as to weaken each other.
A sound reduction system comprises a processor and an active noise control system which can be executed by the processor. The active noise control system is configured to receive an input signal indicating sound existing in an objective space, remove a first signal component from the input signal to produce an error signal, and produce an anti-noise signal on the basis of the error signal. The anti-noise signal drives a loud speaker to produce an audible sound interfering an undesired sound existing in the objective space so as to weaken each other.
WERTZ DUANE
| JP2008203828A | 2008-09-04 | |||
| JPH0540487A | 1993-02-19 | |||
| JPH0643881A | 1994-02-18 | |||
| JPH064085A | 1994-01-14 |
Takaaki Yasumura
Natsuki Morishita
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