Multi device clock synchronization for sensor data fusion

    公开(公告)号:US11451931B1

    公开(公告)日:2022-09-20

    申请号:US17112376

    申请日:2020-12-04

    Applicant: Apple Inc.

    Abstract: Immersive audio can be generated and/or updated in real-time as an accessory device presenting the audio is moved with respect to a computing device presenting accompanying video content. This real-time immersive audio is enabled by determining positions of the accessory device with respect to the computing device, based on real-time analysis of sensor information from the accessory device and the computing device. Accurate positions can be determined by synchronizing timestamped sensor data from the multiple devices through the use of a clock of a common wireless communication link (e.g., a Bluetooth connection), which may have lower drift than the global clocks of the devices themselves. Calculated offsets associated with differences between the clock of the wireless communication link and the global clocks of the multiple devices can be used to account for inaccuracies in the global clocks of the multiple devices with respect to one another.

    Dynamic device collaboration
    12.
    发明授权

    公开(公告)号:US09838266B2

    公开(公告)日:2017-12-05

    申请号:US13768607

    申请日:2013-02-15

    Applicant: Apple Inc.

    Abstract: Using various functionalities of electronic devices such as applications that gather location information to provide a service to the user can come at the cost of significant power consumption, and consequently battery drainage. A data sharing system enables the creation of a network of participant devices where participant devices in the network can take turns in collecting and sharing data with the rest of the participant devices in the network. The one or more participant devices can share the obtained data through Bluetooth® low energy (BTLE) or other low consumption channel, so that the ensemble of participant devices could have better battery life, higher availability, and/or better accuracy, compared to each device having to individually obtain the data.

    Methods for maintaining accurate timing information on portable electronic devices
    13.
    发明授权
    Methods for maintaining accurate timing information on portable electronic devices 有权
    在便携式电子设备上保持准确的定时信息的方法

    公开(公告)号:US09488964B2

    公开(公告)日:2016-11-08

    申请号:US14475216

    申请日:2014-09-02

    Applicant: Apple Inc.

    Abstract: Methods for operating portable electronic devices to maintain accurate timing information are provided. In one suitable arrangement, an electronic device may have a real-time clock and a mach-time clock that can be used separately to track the Coordinated Universal Time (UTC). The offset of the real-time clock and the mach-time clock from UTC can be monitored to determine if there is any oscillator frequency drift, which can be characterized using a linear model. Any variation in drift caused by environment factors such as temperature may also be characterized. In another suitable arrangement, a primary electronic device that is capable of maintaining accurate timing information may transfer that information to a secondary user device. Timing information may be transferred using mach-time values and may then be converted to real-time clock values to ensure that the secondary user device can estimate time accurately even when the device goes to sleep.

    Abstract translation: 提供了用于操作便携式电子设备以维持准确的定时信息的方法。 在一个合适的布置中,电子设备可以具有可以单独使用的跟踪协调世界时(UTC)的实时时钟和机时时钟。 可以监视实时时钟的偏移量和来自UTC的机械时钟时钟,以确定是否存在振荡器频率漂移,这可以使用线性模型进行表征。 也可以表征由环境因素如温度引起的漂移的任何变化。 在另一种合适的布置中,能够维持准确定时信息的主电子设备可以将该信息传送到次用户设备。 可以使用机械时间值传送定时信息,然后可以将其转换为实时时钟值,以确保辅助用户设备即使在设备进入睡眠时也可准确估计时间。

    WIRELESS LOCATION OPTIMIZATION
    15.
    发明申请
    WIRELESS LOCATION OPTIMIZATION 有权
    无线位置优化

    公开(公告)号:US20140242961A1

    公开(公告)日:2014-08-28

    申请号:US13777247

    申请日:2013-02-26

    Applicant: APPLE INC.

    CPC classification number: H04W64/00 H04W4/02 H04W4/50

    Abstract: Systems and methods are provided for configuring settings of a mobile device based on an inferred location. The mobile device can use stored indicia of trip (e.g., an electronic ticket or itinerary) to identify origination and destination locations. The start and end of the trip can be inferred based on changes in operation of the mobile device. For instance, if the user is on an airplane, the user may turn off network connectivity at the origination location just prior to takeoff, and may turn the network connectivity back on upon landing at the destination location. If the time that elapsed between the changes in operation is consistent with the duration of the trip indicated by the stored indicia, the mobile device can infer that the current location is the destination location. The mobile device can then configure location-specific settings in accordance with the destination location to establish a network connection.

    Abstract translation: 提供了系统和方法,用于基于推断的位置来配置移动设备的设置。 移动设备可以使用存储的行程标记(例如,电子票或行程)来识别发起和目的地位置。 旅行的开始和结束可以基于移动设备的操作变化来推断。 例如,如果用户在飞机上,用户可以在起飞之前的起始位置处关闭网络连接,并且可以在目的地位置登陆时重新开启网络连接。 如果在操作变化之间经过的时间与由所存储的标记指示的行程的持续时间一致,则移动设备可以推断当前位置是目的地位置。 然后,移动设备可以根据目的地位置来配置位置特定设置,以建立网络连接。

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