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    Methods and devices for context set selection
    3.
    发明授权
    Methods and devices for context set selection 有权

    公开(公告)号：US10075717B2

    公开(公告)日：2018-09-11

    申请号：US15419167

    申请日：2017-01-30

    Applicant: BlackBerry Limited

    Inventor： Tianying Ji ,  Nguyen Nguyen ,  Dake He

    IPC: H04N19/129 ,  H04N19/176 ,  H04N19/60 ,  H04N19/184 ,  H04N19/186

    CPC classification number: H04N19/129 ,  H04N19/176 ,  H04N19/184 ,  H04N19/186 ,  H04N19/51 ,  H04N19/593 ,  H04N19/60

    Abstract: Methods of encoding and decoding for video data are described for encoding or decoding multi-level significance maps. Distinct context sets may be used for encoding the significant-coefficient flags in different regions of the transform unit. In a fixed case, the regions are defined by coefficient group borders. In one example, the upper-left coefficient group is a first region and the other coefficient groups are a second region. In a dynamic case, the regions are defined by coefficient group borders, but the encoder and decoder dynamically determine in which region each coefficient group belongs. Coefficient groups may be assigned to one region or another based on, for example, whether their respective significant-coefficient-group flags were inferred or not.

    COMMUNICATION WITH I-Q DECOUPLED OFDM MODULATION
    4.
    发明申请
    COMMUNICATION WITH I-Q DECOUPLED OFDM MODULATION 审中-公开

    公开(公告)号：US20180123856A1

    公开(公告)日：2018-05-03

    申请号：US15342865

    申请日：2016-11-03

    Applicant: BlackBerry Limited

    Inventor： Shouxing Qu ,  Dake He ,  Stephen McCann

    IPC: H04L27/26 ,  H04L5/00

    CPC classification number: H04L27/2628 ,  H04L5/0007 ,  H04L27/2627 ,  H04L27/2649 ,  H04L27/265 ,  H04L27/2657

    Abstract: In some examples, an apparatus includes a transmitter configured to apply input data as a frequency-domain data sequence to modulate a set of subcarriers, and separate the frequency-domain data sequence into a first subsequence of elements and a second subsequence of elements. A first conjugate symmetric subsequence that is based on inserting a zero value into the first subsequence is formed, and a second conjugate symmetric subsequence that is based on inserting a zero value into the second subsequence is formed, where the zero values are inserted at different positions in the first and second subsequences. A time-domain sequence comprising a first component that is a function of the first conjugate symmetric subsequence, and a second component that is a function of the second conjugate symmetric subsequence is generated.

    DETERMINING AN OPEN/CLOSE STATUS OF A BARRIER
    5.
    发明申请
    DETERMINING AN OPEN/CLOSE STATUS OF A BARRIER 审中-公开

    公开(公告)号：US20180031604A1

    公开(公告)日：2018-02-01

    申请号：US15223693

    申请日：2016-07-29

    Applicant: BlackBerry Limited

    Inventor： Sandeep Chennakeshu ,  Dake He ,  Yu Gao

    IPC: G01P15/14 ,  G01C9/02

    Abstract: In some examples, a sensor device is to mount to a barrier pivotable between an open position and a closed position, the barrier being on a moveable platform. The sensor device includes an accelerometer to measure acceleration data and a rotation sensor to measure rotation about an axis. The sensor device includes at least one processor configured to determine an open/close status of the barrier based on the acceleration data and the rotation data, and an orientation of the moveable platform.

    Mobile media content delivery
    6.
    发明授权
    Mobile media content delivery 有权

    公开(公告)号：US09680896B2

    公开(公告)日：2017-06-13

    申请号：US13767137

    申请日：2013-02-14

    Applicant: BlackBerry Limited

    Inventor： Arnold Sheynman ,  Mark Pecen ,  Marcel Villaflor ,  Dake He

    IPC: G06F15/16 ,  H04L29/06 ,  H04W4/18

    CPC classification number: H04L65/602 ,  H04L65/4084 ,  H04L67/18 ,  H04W4/18

    Abstract: A system and method are disclosed for managing the wireless delivery of streaming media content to a user equipment (UE) device. A UE device establishes a network connection with a local wireless network, which in turn is associated with a wireless network region with a corresponding data infrastructure server. The UE device then requests predetermined streaming media content from the data infrastructure server. A determination is made whether the requested streaming media content is stored in transcoded form on the data infrastructure server. If so, then a control information network is implemented to transmit and receive streaming media content control data between the UE device and the data infrastructure server. In turn, the streaming media content control data is used by the data infrastructure server to control the transmission of the transcoded streaming media content over a data network for delivery to the UE device.

    Perceptual image and video coding
    7.
    发明授权
    Perceptual image and video coding 有权

    公开(公告)号：US09628803B2

    公开(公告)日：2017-04-18

    申请号：US14552590

    申请日：2014-11-25

    Applicant: BlackBerry Limited

    Inventor： Dake He

    IPC: H04N19/124 ,  H04N19/60 ,  H04N19/154 ,  H04N19/147 ,  H04N19/44 ,  H04N19/61 ,  H04N19/105 ,  H04N19/176

    CPC classification number: H04N19/124 ,  H04N19/105 ,  H04N19/147 ,  H04N19/154 ,  H04N19/176 ,  H04N19/44 ,  H04N19/60 ,  H04N19/61

    Abstract: Methods and devices for perceptual image and video coding. A method for reconstructing a quantization parameter for a current block includes predicting the quantization parameter, wherein predicting the quantization parameter is based upon a previous quantization parameter used for a neighboring block in the image, an estimated AC energy of the neighboring block, and an estimated AC energy of the current block; decoding from the bitstream a quantization parameter residual; and deriving the quantization parameter from the predicted quantization parameter and the quantization parameter residual. The method may include reconstructing the pixels of the current block, including dequantizing decoded quantized transform domain coefficients based on the quantization parameter.

    Apparatus and method to support encoding and decoding video data
    9.
    发明授权
    Apparatus and method to support encoding and decoding video data 有权
    支持编码和解码视频数据的装置和方法

    公开(公告)号：US09438923B2

    公开(公告)日：2016-09-06

    申请号：US14296901

    申请日：2014-06-05

    Applicant: BlackBerry Limited

    Inventor： Dake He ,  Gaëlle Christine Martin-Cocher

    IPC: H04N19/50 ,  H04N19/103 ,  H04N19/176

    CPC classification number: H04N19/50 ,  H04N19/103 ,  H04N19/11 ,  H04N19/136 ,  H04N19/157 ,  H04N19/176 ,  H04N19/593

    Abstract: To support encoding a control circuit determines a primary prediction mode to employ when encoding a block of video data and then determines a corresponding companion prediction mode to correspond to the primary prediction mode. The control circuit can then generate a mixed prediction for the block of video data by mixing a prediction formed using the primary prediction mode with a prediction formed using the companion prediction mode. By one approach the control circuit determines the corresponding companion prediction mode by accessing a companion prediction mode lookup table. In such a case, if desired, upon generating the mixed prediction for the block of video data the control circuit can also automatically update the companion prediction mode lookup table. By one approach a corresponding decoder infers the employed companion prediction mode (or modes).

    Abstract translation: 为了支持编码，控制电路确定在对视频数据块进行编码时采用的主要预测模式，然后确定对应于主要预测模式的对应伴随预测模式。 然后，控制电路可以通过将使用主预测模式形成的预测与使用伴随预测模式形成的预测混合来生成视频数据块的混合预测。 通过一个方法，控制电路通过访问伴随预测模式查找表来确定对应的伴随预测模式。 在这种情况下，如果需要，在生成视频数据块的混合预测时，控制电路还可以自动更新伴随预测模式查找表。 通过一种方法，相应的解码器推断所采用的伴侣预测模式（或模式）。

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