The authors revisit the topic of online electrical system identification with adaptive filters for dynamic loudspeakers and investigate into the causality of the plant loudspeaker systems to be identified. The effects of the non-causal portion of plant system are analyzed and simulated results establish the link between the non-causality in impulse response and the voice coil inductance. The improvements of introducing necessary delay to the desired signal are proposed to enable the characterization of such non-causality. The proposed architecture with small delay extends the working bandwidth of online loudspeaker system identification and improves the accuracy of existing adaptive identification schemes without delays, which are traditionally restricted to run at low frequency bands.
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