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1.发明申请公开(公告)号：US20220200608A1
公开(公告)日：2022-06-23
申请号：US17125595
申请日：2020-12-17
Applicant: QUALCOMM Incorporated
Inventor： Zhengzheng WU , Chao SONG , Karthik NAGARAJAN
Abstract: A digital phase-frequency detector characterizes a delay between two input clock signals using a ring oscillator. A cycle count of a ring oscillator signal circulating through a loop in the ring oscillator during the delay provides a coarse measurement of the delay. A phase of the ring oscillator signal in the loop at the end of the delay provides a fine measurement of the delay. A digital phase-locked loop may control an oscillation frequency of a digitally-controlled oscillator responsive to the fine measurement of the delay and control a division within a clock divider responsive to the coarse measurement of the delay.
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公开(公告)号：US20220182065A1
公开(公告)日：2022-06-09
申请号：US17449250
申请日：2021-09-28
Applicant: QUALCOMM Incorporated
Inventor： Zhengzheng WU , Chao SONG , Karthik NAGARAJAN
Abstract: A digital-to-time converter (DTC) converts a digital code into a time delay using a capacitor digital-to-analog converter (CDAC) that functions as a charging capacitor. The DTC includes a switched capacitor voltage-to-current converter for the formation of a charging current (or a discharging current) for charging (or for discharging) the charging capacitor responsive to a triggering clock edge that begins the time delay. A comparator compares a voltage on the charging capacitor to a threshold voltage to determine an end of the time delay.
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Patent Agency Ranking
公开(公告)号：US20210075434A1
公开(公告)日：2021-03-11
申请号：US16563083
申请日：2019-09-06
Applicant: QUALCOMM Incorporated
Inventor： Debesh BHATTA , Kevin Jia-Nong WANG , Karthik NAGARAJAN , John ABCARIUS , Andrew WEIL , Christian VENERUS , Jeffrey Mark HINRICHS
Abstract: Certain aspects of the present disclosure provide apparatus and techniques for digital-to-analog conversion. One example apparatus generally includes a first digital-to-analog converter (DAC) having an input coupled to a digital input node of the apparatus, a second DAC, a digital processor coupled between the digital input node and an input of the second DAC, and a combiner coupled to the first DAC and the second DAC.
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公开(公告)号：US20190130580A1
公开(公告)日：2019-05-02
申请号：US16158079
申请日：2018-10-11
Applicant: QUALCOMM Incorporated
Inventor： Ying CHEN , Yang ZHOU , Karthik NAGARAJAN , Ning BI
Abstract: Techniques and systems are provided for tracking objects in one or more video frames. For example, a first set of one or more bounding regions are determined for a video frame based on a trained classification network applied to the video frame. The first set of one or more bounding regions are associated with one or more objects in the video frame. One or more blobs can be detected for the video frame. A blob includes pixels of at least a portion of an object in the video frame. A second set of one or more bounding regions are determined for the video frame that are associated with the one or more blobs. A final set of one or more bounding regions is determined for the video frame using the first set of one or more bounding regions and the second set of one or more bounding regions. Object tracking can then be performed for the video frame using the final set of one or more bounding regions.
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公开(公告)号：US20210091784A1
公开(公告)日：2021-03-25
申请号：US16577074
申请日：2019-09-20
Applicant: QUALCOMM INCORPORATED
Inventor： Yi-Hung TSENG , Karthik NAGARAJAN
Abstract: A digital to analog converter (DAC) includes a plurality of DAC transistor devices having an input side configured to be selectively coupled to a system voltage based on a digital input signal and an output side configured to provide an analog output signal, a plurality of non-DAC transistor devices coupled to the input side of the DAC transistor devices, the non-DAC transistor devices configured as variable resistances, and a control circuit configured to adjust a bias of the non-DAC transistor devices.
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公开(公告)号：US20190304102A1
公开(公告)日：2019-10-03
申请号：US16290790
申请日：2019-03-01
Applicant: QUALCOMM Incorporated
Inventor： Ying CHEN , Songan MAO , Yang ZHOU , Karthik NAGARAJAN
Abstract: Techniques and systems are provided for classifying objects in one or more video frames. An object tracker associated with an object in a current video frame can be selected for object classification. Object classification can be determined to be performed in a next video frame (instead of the current video frame) for the object associated with the selected tracker. An image patch to use for the object classification can be obtained from the next video frame. The image patch can be based on a first bounding region associated with the object tracker in the current video frame, can be based on a second bounding region associated with the tracker in the next video frame, or can be based on both the first and second bounding regions. The object classification can be performed for the object associated with the selected object tracker using the image patch from the next video frame.
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公开(公告)号：US20190130583A1
公开(公告)日：2019-05-02
申请号：US16172540
申请日：2018-10-26
Applicant: QUALCOMM Incorporated
Inventor： Ying CHEN , Yang ZHOU , Karthik NAGARAJAN
Abstract: Techniques and systems are provided for tracking objects in a sequence of video frames. For example, an object tracker maintained for the sequence of video frames is identified. An object tracked by the object tracker is detected based on an application of an object detector to at least one key frame in the sequence of video frames. The object detector can include a complex object detector. A status of the object tracker can be updated to a still status in a current video frame of the sequence of video frames. A tracker having the still status is associated with an object that is static in one or more video frames of the sequence of video frames. The object can be tracked in the current video frame using the object tracker based on the status of the object tracker being updated to the still status in the current video frame. For example, a bounding region of the object tracker in the current frame can be replaced with a previous bounding region of the object tracker in a previous frame based on the status of the object tracker being updated to the still status in the current video frame.
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