Method and apparatus to reduce the effect of flux modulation...

Details Method and apparatus to reduce the effect of flux modulation... Method and apparatus to reduce the effect of flux modulation...

2008-03-18

2011-10-04

Ha, Nathan (Department: 2814)

Electrical audio signal processing systems and devices

Loudspeaker feedback

Reexamination Certificate

active

08031882

ABSTRACT:
A speaker feedback system has a linear current feedback derived from a current sensing resistor. A linear motional feedback from the active speaker driver is derived from a sensing coil mechanically coupled with the driver coil of the speaker, the driver coil receiving electrical energy from the power amplifier. A motional signal correction circuit extracts the motional signal from the sensing coil and feeds to input B of the multiplier. A current filter circuit filters out higher-frequency signals from the current feedback signal and then feeds to input A of the multiplier. A multiplier performs the multiplication function of its two inputs and produces an output. Post-multiplier equalization circuitry that control the feedback gain of the nonlinear feedback system such that it can effectively compensate for the effect of flux modulation over the targeted frequency range. A feedback network feeds the output from post multiplier equalization to the power amplifier.

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