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    Systems and methods for adjusting automatic gain control
    32.
    发明授权
    Systems and methods for adjusting automatic gain control 有权
    调整自动增益控制的系统和方法

    公开(公告)号：US09401685B2

    公开(公告)日：2016-07-26

    申请号：US13800487

    申请日：2013-03-13

    Applicant: Apple Inc.

    Inventor： Arvindh Krishnaswamy ,  Juha O. Merimaa ,  Kapil Krishnamurthy ,  Yuchao Song

    IPC: H03G3/20 ,  H03G3/30

    CPC classification number: H03G3/3005 ,  H03G3/20 ,  H03G3/3089

    Abstract: Automatic gain control systems disclosed herein can incorporate a confidence metric that can estimate the accuracy of gain adjustments calculated by an automatic gain control module. The confidence metric may be based on a percentage of valid audio samples in a given period of time. Based on the confidence metric, the AGC response may be reduced, delayed, frozen, or otherwise altered from the baseline gain adjustment. Time-averaging process may be used to estimate the input signal power level and determine an appropriate baseline gain adjustment. Additionally, weighting functions can be adjusted to prevent overestimation of the signal power.

    Abstract translation: 本文公开的自动增益控制系统可以包括可以估计由自动增益控制模块计算的增益调整的精度的置信度量度。 可信度度量可以基于给定时间段内的有效音频样本的百分比。 基于可信度度量，AGC响应可以被减小，延迟，冻结或者从基线增益调整改变。 时间平均过程可用于估计输入信号功率电平并确定适当的基线增益调整。 此外，可以调整加权函数以防止信号功率的过高估计。

    SYSTEMS AND METHODS FOR ADJUSTING AUTOMATIC GAIN CONTROL
    33.
    发明申请
    SYSTEMS AND METHODS FOR ADJUSTING AUTOMATIC GAIN CONTROL 有权
    用于调整自动增益控制的系统和方法

    公开(公告)号：US20130329912A1

    公开(公告)日：2013-12-12

    申请号：US13800487

    申请日：2013-03-13

    Applicant: APPLE INC.

    Inventor： Arvindh Krishnaswamy ,  Juha O. Merimaa ,  Kapil Krishnamurthy ,  Yuchao Song

    IPC: H03G3/20

    CPC classification number: H03G3/3005 ,  H03G3/20 ,  H03G3/3089

    Abstract: Automatic gain control systems disclosed herein can incorporate a confidence metric that can estimate the accuracy of gain adjustments calculated by an automatic gain control module. The confidence metric may be based on a percentage of valid audio samples in a given period of time. Based on the confidence metric, the AGC response may be reduced, delayed, frozen, or otherwise altered from the baseline gain adjustment. Time-averaging process may be used to estimate the input signal power level and determine an appropriate baseline gain adjustment. Additionally, weighting functions can be adjusted to prevent overestimation of the signal power.

    Abstract translation: 本文公开的自动增益控制系统可以包括可以估计由自动增益控制模块计算的增益调整的精度的置信度量度。 可信度度量可以基于给定时间段内的有效音频样本的百分比。 基于可信度度量，AGC响应可以被减小，延迟，冻结或者从基线增益调整改变。 时间平均过程可用于估计输入信号功率电平并确定适当的基线增益调整。 此外，可以调整加权函数以防止信号功率的过高估计。

    SPATIAL AUDIO REPRODUCTION BASED ON HEAD-TO-TORSO ORIENTATION
    36.
    发明申请
    SPATIAL AUDIO REPRODUCTION BASED ON HEAD-TO-TORSO ORIENTATION 有权

    公开(公告)号：US20220329965A1

    公开(公告)日：2022-10-13

    申请号：US17847095

    申请日：2022-06-22

    Applicant: Apple Inc.

    Inventor： Antti J. Vanne ,  Darius A. Satongar ,  James W. Vandyke ,  Juha O. Merimaa ,  Martin E. Johnson ,  Tomi A. Huttunen

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

    Abstract: A media system and a method of using the media system to reproduce spatial audio based on head-to-torso orientation, are described. The method includes determining a head-to-source orientation and a head-to-torso orientation based on head orientation data generated by a head tracking device. Determining the head-to-torso orientation includes determining torso movements based on movements of the head. The torso can be determined to move when the head movements meet a head movement condition, such as a predetermined angle of movement or pattern of movement. A binaural audio filter that is based on a head-related transfer function corresponding to both the head-to-source orientation and the head-to-torso orientation is applied to an audio input signal to generate an audio output signal. The audio output signal is played to accurately recreate spatial audio having sounds emitted to the user by a sound source. Other aspects are also described and claimed.

    Coordinated tracking for binaural audio rendering
    37.
    发明授权
    Coordinated tracking for binaural audio rendering 有权

    公开(公告)号：US11265670B2

    公开(公告)日：2022-03-01

    申请号：US16865185

    申请日：2020-05-01

    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 ROOM IMPULSE RESPONSE FOR SPATIAL AUDIO REPRODUCTION
    38.
    发明申请
    BINAURAL ROOM IMPULSE RESPONSE FOR SPATIAL AUDIO REPRODUCTION 有权

    公开(公告)号：US20210398545A1

    公开(公告)日：2021-12-23

    申请号：US17316408

    申请日：2021-05-10

    Applicant: Apple Inc.

    Inventor： Martin E. Johnson ,  Juha O. Merimaa

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

    Abstract: A binaural room impulse response (BRIR) can be generated based on a position of a listener's head, and a plurality of head related impulse responses (HRIRs). Each of the plurality of HRIRs are selected for a respective one of a plurality of acoustic reflections which, when taken together, approximate reverberation of a room. Each of the acoustic reflections have a direction and a delay. The BRIR filter is applied to source audio to generate binaural audio output.

    Coordinated tracking for binaural audio rendering
    40.
    发明授权
    Coordinated tracking for binaural audio rendering 审中-公开

    公开(公告)号：US10674308B2

    公开(公告)日：2020-06-02

    申请号：US16396277

    申请日：2019-04-26

    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.

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