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    Ambience extraction from stereo signals based on least-squares approach
    22.
    发明授权
    Ambience extraction from stereo signals based on least-squares approach 有权

    公开(公告)号：US09928842B1

    公开(公告)日：2018-03-27

    申请号：US15275312

    申请日：2016-09-23

    Applicant: Apple Inc.

    Inventor： Juha O. Merimaa ,  Bruce C. Po ,  Adam E. Kriegel

    IPC: H03G5/00 ,  G10L19/008 ,  H04S7/00 ,  H04S5/00 ,  H04S3/00

    CPC classification number: G10L19/008 ,  H03G5/00 ,  H03G5/165 ,  H04S3/002 ,  H04S3/008 ,  H04S5/00 ,  H04S7/30 ,  H04S2400/01

    Abstract: Ambience extraction from a multichannel input signal is provided. The multichannel input signal is converted into a time-frequency representation. A cross-correlation coefficient is computed for each time and frequency in the time-frequency representation of the multichannel input signal. An autocorrelation is computed for each time and frequency in the time-frequency representation of the multichannel input signal. Using the cross-correlation coefficient and the autocorrelation, ambience extraction coefficients including crosstalk and same-side coefficients are computed as a function of a tuning parameter, the crosstalk coefficients being proportional to the tuning parameter and the tuning parameter being between a value of 0 and a value of 1. The ambience extraction coefficients are applied to extract a left ambience component and a right ambience component.

    Systems and methods for determining the condition of multiple microphones
    23.
    发明授权
    Systems and methods for determining the condition of multiple microphones 有权
    用于确定多个麦克风状况的系统和方法

    公开(公告)号：US09432787B2

    公开(公告)日：2016-08-30

    申请号：US15019521

    申请日：2016-02-09

    Applicant: Apple Inc.

    Inventor： Arvindh Krishnaswamy ,  David T. Yeh ,  Juha O. Merimaa ,  Sean A. Ramprashad

    IPC: H04R29/00 ,  H04R3/00

    CPC classification number: H04R29/005 ,  H04R3/00 ,  H04R29/004 ,  H04R2499/11

    Abstract: Systems and methods for determining the operating condition of multiple microphones of an electronic device are disclosed. A system can include a plurality of microphones operative to receive signals, a microphone condition detector, and a plurality of microphone condition determination sources. The microphone condition detector can determine a condition for each of the plurality of microphones by using the received signals and accessing at least one microphone condition determination source.

    Abstract translation: 公开了用于确定电子设备的多个麦克风的操作条件的系统和方法。 系统可以包括可操作以接收信号的多个麦克风，麦克风条件检测器和多个麦克风条件确定源。 麦克风条件检测器可以通过使用接收到的信号并访问至少一个麦克风条件确定源来确定多个麦克风中的每一个的条件。

    Layered coding of audio with discrete objects
    26.
    发明授权
    Layered coding of audio with discrete objects 有权

    公开(公告)号：US11430451B2

    公开(公告)日：2022-08-30

    申请号：US16584706

    申请日：2019-09-26

    Applicant: Apple Inc.

    Inventor： Dipanjan Sen ,  Frank Baumgarte ,  Juha O. Merimaa

    IPC: G10L19/008 ,  H04S7/00 ,  H04S3/00 ,  H04N21/2343 ,  H04N21/2368 ,  G11B27/22 ,  H04N21/439 ,  H04N21/81 ,  H04N21/6587

    Abstract: A first layer of data having a first set of Ambisonic audio components can be decoded where the first set of Ambisonic audio components is generated based on ambience and one or more object-based audio signals. A second layer of data is decoded having at least one of the one or more object-based audio signals. One of the object-based audio signals is subtracted from the first set of Ambisonic audio components. The resulting Ambisonic audio components are rendered to generate a first set of audio channels. The one or more object-based audio signals are spatially rendered to generate a second set of audio channels. Other aspects are described and claimed.

    LAYERED CODING OF AUDIO WITH DISCRETE OBJECTS
    27.
    发明申请
    LAYERED CODING OF AUDIO WITH DISCRETE OBJECTS 有权

    公开(公告)号：US20220262373A1

    公开(公告)日：2022-08-18

    申请号：US17739901

    申请日：2022-05-09

    Applicant: Apple Inc.

    Inventor： Dipanjan Sen ,  Frank Baumgarte ,  Juha O. Merimaa

    IPC: G10L19/008 ,  H04S7/00 ,  H04S3/00

    Abstract: A first layer of data having a first set of Ambisonic audio components can be decoded where the first set of Ambisonic audio components is generated based on ambience and one or more object-based audio signals. A second layer of data is decoded having at least one of the one or more object-based audio signals. One of the object-based audio signals is subtracted from the first set of Ambisonic audio components. The resulting Ambisonic audio components are rendered to generate a first set of audio channels. The one or more object-based audio signals are spatially rendered to generate a second set of audio channels. Other aspects are described and claimed.

    Real-time acoustic simulation of edge diffraction
    28.
    发明授权
    Real-time acoustic simulation of edge diffraction 有权

    公开(公告)号：US11070933B1

    公开(公告)日：2021-07-20

    申请号：US16942680

    申请日：2020-07-29

    Applicant: Apple Inc.

    Inventor： Dirk Schroeder ,  Jonathan D. Sheaffer ,  Soenke Pelzer ,  Juha O. Merimaa

    IPC: H04S7/00 ,  H04R3/04 ,  H04R5/033 ,  H04S1/00 ,  H04R5/04

    Abstract: A computer system having an electronic device determines a listener position within a computer-generated reality (CGR) setting that is to be aurally experienced by a user of the electronic device through at least one speaker. The system determines a source position of a virtual sound source within the CGR setting and determines a characteristic of a virtual object within the CGR setting, where the characteristic include a geometry of an edge of the virtual object. The system determines at least one edge-diffraction filter parameter for an edge-diffraction filter based on 1) the listener position, 2) the source position, and 3) the geometry. The system applies the edge-diffraction filter to an input audio signal to produce a filtered audio signal that accounts for edge-diffraction of sound produced by the virtual sound source within the CGR setting.

    Coordinated tracking for binaural audio rendering
    29.
    发明授权
    Coordinated tracking for binaural audio rendering 有权

    公开(公告)号：US10278003B2

    公开(公告)日：2019-04-30

    申请号：US15465540

    申请日：2017-03-21

    Applicant: Apple Inc.

    Inventor： Darius A. Satongar ,  Afrooz Family ,  Sylvain J. Choisel ,  Juha O. Merimaa

    IPC: H04S7/00 ,  G06F3/01 ,  H04R5/033 ,  H04R5/04

    Abstract: A binaural sound reproduction system, and methods of using the binaural sound reproduction system to dynamically re-center a frame of reference for a virtual sound source, are described. The binaural sound reproduction system may include a reference device, e.g., a mobile device, having a reference sensor to provide reference orientation data corresponding to a direction of the reference device, and a head-mounted device, e.g., headphones, having a device sensor to provide device orientation data corresponding to a direction of the head-mounted device. The system may use the reference orientation data to determine whether the head-mounted device is being used in a static or dynamic use case, and may adjust an audio output to render the virtual sound source in an adjusted source direction based on the determined use case. Other embodiments are also described and claimed.

    Binaural sound reproduction system having dynamically adjusted audio output
    30.
    发明授权
    Binaural sound reproduction system having dynamically adjusted audio output 有权

    公开(公告)号：US10028071B2

    公开(公告)日：2018-07-17

    申请号：US15465544

    申请日：2017-03-21

    Applicant: Apple Inc.

    Inventor： Darius A. Satongar ,  Afrooz Family ,  Sylvain J. Choisel ,  Juha O. Merimaa

    IPC: H04R5/02 ,  H04S7/00 ,  H04R5/00

    Abstract: A binaural sound reproduction system, and methods of using the binaural sound reproduction system to dynamically re-center a frame of reference for a virtual sound source, are described. The binaural sound reproduction system may include a head-mounted device, e.g., headphones, having a device sensor to provide device orientation data corresponding to a direction of the head-mounted device. The system may use the orientation data to determine whether the head-mounted device has moved over an angle within a range of movement, and may adjust an audio output to render the virtual sound source in an adjusted source direction based on the range of movement. Other embodiments are also described and claimed.

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