ACTIVE NOISE CANCELLATION INTEGRATED CIRCUIT FOR STACKING AT LEAST ONE ANTI-NOISE SIGNAL AND AT LEAST ONE NON-ANTI-NOISE SIGNAL, ASSOCIATED METHOD, AND ACTIVE NOISE CANCELLATION HEADPHONE USING THE SAME

The present invention relates to an active noise cancellation integrated circuit for stacking at least one anti-noise signal and at least one non-anti-noise signal, an associated method, and an active noise cancellation headphone using the same. The method is applicable to an audio playback device with at least one ANC filtering unit and at least one non-ANC filtering unit. The method includes: acquiring a non-anti-noise signal from a non-ANC filtering unit; generating a decoupled signal by processing the non-anti-noise signal with the transfer function of a physical channel and operations of an ANC filtering unit; performing a signal superposition, wherein an anti-noise signal from the ANC filtering unit is superposed with the decoupled signal; and performing an audio playback based on the superposed signal and an audio signal such that noise is eliminated.