公开(公告)号：EP4120693A1

公开(公告)日：2023-01-18

申请号：EP22183593.7

申请日：2022-07-07

申请人： Alps Alpine Co., Ltd.

发明人： Saito, Yuji ,  Toita, Hiroki ,  Taguchi, Hiroyuki ,  Tachi, Ryosuke ,  Mashiko, Tatsuya

IPC分类号： H04R3/04 ,  H04R3/00 ,  H04R29/00

摘要： Provided are a "speaker distortion correction device and a speaker unit" that restrict unusual operations while appropriately correcting distortion.
An input signal (Si) passes through a nonlinear-portion correction filter (41), and is input into a linear inverse filter (42). An output signal (So) from the linear inverse filter (42) is output into a speaker (2) through an amplifier (5). For the nonlinear-portion correction filter (41), set are transfer characteristics (filter coefficients) that eliminate distortion due to nonlinear characteristics of the speaker (2). With a difference, as an error, between vibration of the speaker (2) without distortion relative to an input signal (Si) and vibration of a vibration system of the speaker (2) measured by a vibration measurement unit (3), an adaptive-algorithm execution unit (43) performs an adaptive operation that adaptively updates filter coefficients of the linear inverse filter (42). When the amplitude of vibration of the vibration system of the speaker (2) measured by the vibration measurement unit (3) deviates from a range normal relative to an input voltage input into the speaker (2), a control unit (1) stops the adaptive operation of the adaptive-algorithm execution unit (43)

公开(公告)号：EP4380191A1

公开(公告)日：2024-06-05

申请号：EP23212428.9

申请日：2023-11-27

申请人： Alps Alpine Co., Ltd.

发明人： Ito, Ryo ,  Saito, Yuji ,  Egami, Katsuhiko ,  Toita, Hiroki

IPC分类号： H04R3/00 ,  H04R9/02

CPC分类号： H04R3/002 ,  H04R9/025

摘要： A magnetic circuit section having a main magnetic gap and sub-magnetic gaps is used. After a vibrator is vibrated by an electromagnetic force generated by a voice current which flows through a voice coil and a magnetic flux crossing the main magnetic gap, when the voice coil approaches or enters a sub-magnetic gap, the voice current which flows through the voice coil is reversed, temporarily cut-off or attenuated.

公开(公告)号：EP4325889A1

公开(公告)日：2024-02-21

申请号：EP23189054.2

申请日：2023-08-01

申请人： Alps Alpine Co., Ltd.

发明人： Saito, Yuji ,  Taguchi, Hiroyuki ,  Egami, Katsuhiko ,  Toita, Hiroki

IPC分类号： H04R3/00

摘要： In an audio system, when overheating of a speaker is detected, a controller controls first and second selectors to input an audio signal output by an audio source device to a cooling processing section and cause output of the cooling processing section to be output to the speaker. In the cooling processing section, a mixer mixes an audio signal obtained by removing a low-frequency component from the input audio signal by a high-pass filter with a cooling signal at an infrasonic frequency generated by a cooling signal generator and adjusted with a gain by a gain adjuster. An audio signal obtained by mixing the audio signal with the cooling signal is output from the cooling processing section via a nonlinear inverse filter. A gain setting section sets the gain such that power of the cooling signal matches power of the low-frequency component extracted by a low-pass filter.

公开(公告)号：EP4231665A1

公开(公告)日：2023-08-23

申请号：EP23154411.5

申请日：2023-02-01

申请人： Alps Alpine Co., Ltd.

发明人： Toita, Hiroki ,  Yoshida, Yusuke

IPC分类号： H04R7/12 ,  H04R7/24 ,  H04R31/00 ,  H04R9/04 ,  H04R9/06

摘要： A speaker includes a diaphragm including a circular hole in which a bobbin is attached and an oval or elliptical outer peripheral end. The diaphragm includes a circular cross-sectional area in the range of a predetermined height above a base having the circular hole. The diaphragm further includes an intermediate area whose outer surface has a small curvature radius above the circular cross-sectional area and an expanded area that is oval in cross section above the intermediate area.