US 12,035,115 B2
Speaker distortion correction device
Yuji Saito, Fukushima (JP); Hiroki Toita, Fukushima (JP); Hiroyuki Taguchi, Fukushima (JP); Ryosuke Tachi, Fukushima (JP); and Tatsuya Mashiko, Fukushima (JP)
Assigned to ALPS ALPINE CO., LTD., Tokyo (JP)
Filed by Alps Alpine Co., LTD, Tokyo (JP)
Filed on Jul. 8, 2022, as Appl. No. 17/860,861.
Claims priority of application No. 2021-117549 (JP), filed on Jul. 16, 2021.
Prior Publication US 2023/0012785 A1, Jan. 19, 2023
Int. Cl. H04R 3/00 (2006.01)
CPC H04R 3/007 (2013.01) 18 Claims
OG exemplary drawing
 
1. A speaker distortion correction device for correcting distortion of output from a speaker relative to an input signal, the speaker distortion correction device comprising:
a vibration detection unit configured to detect vibration of a vibration system of the speaker;
a variable filter into which the input signal is input, the variable filter being configured to output an output signal that drives the speaker;
an adaptive-algorithm execution unit configured to execute a predetermined adaptive algorithm to perform an adaptive operation that updates a transfer characteristic of the variable filter so that vibration detected by the vibration detection unit becomes vibration without distortion relative to the input signal; and
a control unit,
wherein the control unit is configured to
determine whether or not an amplitude of vibration detected by the vibration detection unit deviates from a range considered normal relative to a level of an output signal output by the variable filter, and
when the amplitude of the vibration detected by the vibration detection unit deviates from the range considered normal relative to the level of the output signal output by the variable filter, stop an update on the transfer characteristic of the variable filter updated by the adaptive operation of the adaptive-algorithm execution unit.