公开(公告)号：US5185801A

公开(公告)日：1993-02-09

申请号：US732445

申请日：1991-07-18

Applicant: John D. Meyer ,  Paul Kohut

Inventor： John D. Meyer ,  Paul Kohut

IPC: H04R3/04 ,  H04R3/14 ,  H04R29/00

CPC classification number: H04R29/001 ,  H04R29/003 ,  H04R3/04 ,  H04R3/14

Abstract: A circuit for improving the transient behavior of a two-way loudspeaker system includes a crossover circuit with high selectivity, amplitude and phase correction circuitry for separately correcting the amplitude and phase responses of the high and low frequency drivers in their mounting environment, and correction circuitry for correcting the composite amplitude and phase response of the overall loudspeaker system after insertion of the crossover. A further phase offset technique and circuit provides for introducing frequency dependent phase shift in the loudspeaker system's high or low frequency channels for offsetting the phase responses of the high and low frequency drivers within the crossover frequency range. According to the phase offset technique of the invention, phase shift is added, preferably in the high frequency channel, until composite amplitude response curves observed on-axis and at different vertical angles off-axis are forced to be consistent. After consistency is achieved the deterioration of the amplitude response resulting from the phase offset is corrected to a flat response by means of a forced series amplitude correction circuit inserted before the crossover. The result is improved transient response off-axis as well as on-axis.

Abstract translation: 用于改善双向扬声器系统的瞬态特性的电路包括具有高选择性，幅度和相位校正电路的交叉电路，用于在其安装环境中单独校正高频和低频驱动器的振幅和相位响应，以及校正电路 用于在插入交叉之后校正整个扬声器系统的复合幅度和相位响应。 进一步的相位偏移技术和电路提供了在扬声器系统的高或低频率信道中引入频率相关相移，用于抵消在交叉频率范围内的高频和低频驱动器的相位响应。 根据本发明的相位偏移技术，相位偏移优选地在高频信道中被添加，直到在轴上观察到的不同垂直角度的复合振幅响应曲线被迫使其一致。 在实现一致性之后，通过在交叉之前插入的强制串联幅度校正电路将由相位偏移产生的振幅响应的劣化校正为平坦的响应。 结果是提高了离轴和轴上的瞬态响应。

公开(公告)号：US4406921A

公开(公告)日：1983-09-27

申请号：US273742

申请日：1981-06-15

Applicant: Daniel R. von Recklinghausen

Inventor： Daniel R. von Recklinghausen

IPC: H04R3/04 ,  H04R29/00

CPC classification number: H04R29/003 ,  H04R3/04

Abstract: An improved circuit for a transducer or loud-speaker as used in the measurement of acoustic quantities such as in impedance audiometers for providing accurate linear read outs.

Abstract translation: 用于测量声量的换能器或扬声器的改进电路，例如用于提供精确线性读出的阻抗测听仪。

公开(公告)号：US12126979B2

公开(公告)日：2024-10-22

申请号：US18112209

申请日：2023-02-21

Applicant: Clean Energy Labs, LLC

Inventor： Joseph F. Pinkerton ,  David A. Badger ,  James A. Andrews ,  William Martin Lackowski ,  William Neil Everett

IPC: H04R9/06 ,  H04R1/02 ,  H04R1/28 ,  H04R3/00 ,  H04R9/02 ,  H04R9/04 ,  H04R11/02 ,  H04R17/00 ,  H04R29/00

CPC classification number: H04R9/06 ,  H04R1/025 ,  H04R1/2803 ,  H04R3/00 ,  H04R9/025 ,  H04R9/041 ,  H04R9/046 ,  H04R11/02 ,  H04R17/00 ,  H04R29/001 ,  H04R29/003 ,  H04R2400/07

Abstract: Electroacoustic drivers that can be utilized in loudspeaker systems that utilize drivers having a magnetic negative spring (MNS) (such as reluctance assist drivers (RAD) and permanent magnet crown (PMC) drivers). The electroacoustic drivers can be used at all audio frequencies, including subwoofer frequencies. The magnetic negative springs of the electroacoustic drivers can cancel, or partially cancel, the large pressure forces on a sound panel (of an audio speaker) so that substantial subwoofer notes can be efficiently and cost effectively produced in small/portable speakers. The electroacoustic drivers can include a stabilizing/centering mechanism to overcome the destabilizing forces of a MNS that are too large for a voice coil alone to produce.

公开(公告)号：US20240223980A1

公开(公告)日：2024-07-04

申请号：US17996263

申请日：2021-10-13

Applicant: Google LLC

Inventor： Lei Chen ,  Yahsin Chou ,  Shin-Horng Chen

IPC: H04R29/00 ,  G01R19/12 ,  H04R3/00

CPC classification number: H04R29/003 ,  G01R19/12 ,  H04R3/007 ,  H04R2499/11

Abstract: In general, various aspects of the techniques are directed to transducer excursion correction. A computing device comprising a memory and a processor may be configured to perform the techniques. The memory may store voltage measurements representative of voltage across a transducer and current measurements representative of current through the transducer. The processor may identify a first voltage measurement of the voltage measurements and a first current measurement of the current measurements associated with nonlinear vibration of the transducer. The processor may perform a principal component analysis with respect to the first voltage measurement and the first current measurement to obtain a principal component representative of variation of the voltage across and the current through the transducer. The processor may modify, based on the principal component, an input voltage to be applied across the transducer to reduce the nonlinear vibration of the transducer.

公开(公告)号：US12003927B2

公开(公告)日：2024-06-04

申请号：US17633102

申请日：2020-08-14

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Luca Revelli ,  William Joseph Dymek

IPC: H04R29/00 ,  G10L21/0232 ,  H03G3/30 ,  H04R3/00 ,  H04R3/04 ,  H04R9/06 ,  H04S3/00 ,  H04S7/00

CPC classification number: H04R29/001 ,  G10L21/0232 ,  H03G3/3005 ,  H04R3/007 ,  H04R3/04 ,  H04R9/06 ,  H04R29/003 ,  H04S3/008 ,  H04S7/301 ,  H04S2400/01

Abstract: A method is provided, including: defining a plurality of frequency bins; sending, during a training phase, a test signal at different amplitude levels to one or more speakers, and gathering resulting test voltage (V) and current (I) points for the different amplitude levels and for each frequency bin; for each frequency bin, applying a linear regression algorithm to the gathered test voltage and current points for the different amplitudes to obtain a reference electrical impedance of said one or more speakers; sending, during a monitoring phase subsequent to said training phase, an audio signal to said one or more speakers, and gathering resulting new voltage and current points to obtain an operating electrical impedance for said one or more speakers for each frequency bin, determining a deviation between the operating and the reference electrical impedance, and, if the deviation exceeds a defined tolerance, reporting the deviation to a user.

公开(公告)号：US11997466B2

公开(公告)日：2024-05-28

申请号：US17851089

申请日：2022-06-28

Applicant: Audera Acoustics Inc.

Inventor： John B. French

IPC: H04R9/06 ,  H04R3/00 ,  H04R3/04 ,  H04R3/08 ,  H04R9/02 ,  H04R9/04 ,  H04R29/00

CPC classification number: H04R9/046 ,  H04R3/002 ,  H04R3/007 ,  H04R3/04 ,  H04R3/08 ,  H04R9/025 ,  H04R9/043 ,  H04R9/06 ,  H04R9/063 ,  H04R29/001 ,  H04R29/003

Abstract: Acoustic transducer systems and methods of operating acoustic transducer systems are provided. The methods can involve: receiving an input audio signal; determining a position of a diaphragm; determining a correction factor, a motor force factor, a spring error factor, and a system spring factor based at least on the position of the diaphragm; determining a corrected voice coil current based at least on the input audio signal, the correction factor, the spring error factor, and a velocity of the diaphragm; and applying a corrected audio signal to a voice coil fixed to the diaphragm based at least on the corrected voice coil current, wherein the corrected audio signal corrects the input audio signal to compensate for non-linear characteristics of the acoustic transducer system.

公开(公告)号：US20240147172A1

公开(公告)日：2024-05-02

申请号：US18277184

申请日：2022-02-07

Applicant: ams-OSRAM Asia Pacific Pte. Ltd.

Inventor： Laurent NEVOU ,  Jens GEIGER ,  Goran STOJANOVIC ,  Ferran SUAREZ

IPC: H04R29/00 ,  G01S17/58 ,  H04R9/02 ,  H04R9/06

CPC classification number: H04R29/003 ,  G01S17/58 ,  H04R9/025 ,  H04R9/06 ,  H04R2499/11

Abstract: An electro-acoustic transducer includes a membrane, a substrate, and at least one optical device. The at least one optical device is coupled to the substrate for sensing an excursion or velocity of the membrane. The at least one optical device is disposed on an opposite side of the substrate to the membrane.

公开(公告)号：US20240031751A1

公开(公告)日：2024-01-25

申请号：US18208589

申请日：2023-06-12

Applicant: GP Acoustics (UK) Limited

Inventor： Jack Anthony Oclee-Brown

IPC: H04R29/00 ,  H04R9/04 ,  H04R9/06

CPC classification number: H04R29/003 ,  H04R9/046 ,  H04R9/06

Abstract: Apparatus and methods for a velocity-sensing approach to loudspeaker motional feedback comprising providing a first magnetic field to couple primarily with the voice coil to drive the voice coil, providing a second magnetic field to couple primarily with the sensing winding, and sensing the voltage induced in the second, sensing winding as it reciprocates in the second magnetic field. The second magnetic field has an orientational periodicity which is circumferential in relation to the reciprocation axis and this orientational periodicity extends over at least a part of the length of the former along the reciprocation axis.

公开(公告)号：US20230412997A1

公开(公告)日：2023-12-21

申请号：US18334417

申请日：2023-06-14

Applicant: SAGEMCOM BROADBAND SAS

Inventor： Gabriel BOUVIGNE ,  Loïg ATZEL

IPC: H04R29/00 ,  H04N21/4425 ,  G01H3/06 ,  G01H3/12

CPC classification number: H04R29/003 ,  H04N21/4425 ,  H04R2430/03 ,  G01H3/125 ,  G01H3/06

Abstract: A diagnostic method of electrical equipment which includes a processing unit, an internal microphone, and electrical components other than microphones or speakers, the diagnostic method including the steps of acquiring a received audio signal produced from an ambient sound signal, by the at least one internal microphone or by the at least one external microphone, producing monitoring parameters from the received audio signal, which are representative of an interfering sound signal comprised in the ambient sound signal and emitted by at least one of the electrical components, and detecting a sound anomaly resulting from a failure of at least one electrical component of the electrical equipment from the monitoring parameters.

公开(公告)号：US20230379626A1

公开(公告)日：2023-11-23

申请号：US18136860

申请日：2023-04-19

Applicant: Apple Inc.

Inventor： Yang LIU ,  Ashwat Kandasamy AMIRTHALINGAM ,  Onur I. ILKORUR ,  Thomas M. JENSEN ,  Oliver LEONHARDT ,  David W. ROBISON ,  Teemu P. SIPILA

IPC: H04R3/08 ,  H04R29/00 ,  H04R9/06

CPC classification number: H04R3/08 ,  H04R29/003 ,  H04R9/06

Abstract: Aspects of the subject technology relate to electronic devices having speakers. An electronic device may operate the speaker at or near one or more resonance frequencies of the speaker and/or the electronic device. This can allow the electronic device to efficiently eject an occlusion when the speaker is occluded by a fluid or other debris. For example, the electronic device may determine a resonance frequency by obtaining one or more electrical characteristics of an electronic component while the speaker is occluded, determine the resonance frequency based on the obtained electrical characteristic(s), and operate the speaker at a frequency that is based on the resonance frequency to eject the occlusion.