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    High efficiency homogeneous polarization converter
    111.
    发明授权
    High efficiency homogeneous polarization converter 失效
    高效均质极化转换器

    公开(公告)号：US5757547A

    公开(公告)日：1998-05-26

    申请号：US427577

    申请日：1995-04-24

    Applicant: Jeffrey C. Rodman ,  Brian L. Hinman ,  Pasquale Romano ,  Arlie R. Conner

    Inventor： Jeffrey C. Rodman ,  Brian L. Hinman ,  Pasquale Romano ,  Arlie R. Conner

    IPC: G02B5/30 ,  G02B27/28 ,  G02F1/1335 ,  G02F1/13357

    CPC classification number: G02B5/3025 ,  G02B27/283 ,  G02B27/285 ,  G02B5/3083 ,  G02F1/133536 ,  G02F1/13362 ,  G02F2001/13355

    Abstract: A polarization converter for polarizing a light beam by converting all light waves to the same orientation comprises 1) a first beam dividing matrix of refractory material for dividing a single, large light beam into smaller sub-beam 2) a second beam focusing matrix for polarizing select portions of the sub-beams, and 3) a series of narrow and shallow polarizing cells. The second beam focusing matrix further comprises a plurality of concave lenses for redirecting each sub-beam and quarter wave retarders disposed in alignment with, and adjacent to, the reflective side of an equal plurality of mirror segments. The polarizing cells include either a first beamsplitter or a second beamsplitter, where the first beamsplitters and second beamsplitters are disposed in opposing diagonal fashion and in an alternating manner. Lightwaves of a selected polarization pass directly through the first beamsplitter and out of the polarizing cell, while all other lightwaves are horizontally reflected by the first beamsplitter and directed onto the second beamsplitter where they are redirected toward the quarter wave retarder. The reflected light passes through the quarter wave retarder, reflects off of the mirror and again passes through the quarter wave retarder. The wavelength of the light is retarded ninety degrees as a result of the two passes through the quarter-wave retarder, thus re-orienting the light to the selected orientation. The re-oriented p-waves pass through the second beamsplitter and exit the polarizing cell, join the original p-waves exiting the polarizing cells, and form a beam of polarized light.

    Abstract translation: 用于通过将所有光波转换成相同取向来使光束偏振的偏振转换器包括1）用于将单个大光束分成较小子光束的耐火材料的第一光束分割矩阵2）用于偏振的第二光束聚焦矩阵 选择子光束的部分，以及3）一系列窄而浅的偏振光。 第二光束聚焦矩阵还包括多个凹透镜，用于重定向与等量的多个反射镜段的反射侧对准并相邻设置的每个子光束和四分之一波长延迟器。 偏振元件包括第一分束器或第二分束器，其中第一分束器和第二分束器以相对的对角线方式并且以交替方式设置。 所选极化的光波直接通过第一分束器并离开偏振单元，而所有其它光波被第一分束器水平地反射并被引导到第二分束器上，在那里它们被重定向到四分之一波长延迟器。 反射光通过四分之一波长延迟器，反射离开镜子，再次通过四分之一波长延迟器。 作为两次通过四分之一波长延迟器的结果，光的波长延迟了90度，因此将光重新定向到所选取向。 重定向的p波通过第二分束器并离开偏振单元，连接离开偏振单元的原始p波，并形成偏振光束。

    Context based annotating in an electronic presentation system
    114.
    发明授权
    Context based annotating in an electronic presentation system 有权

    公开(公告)号：US11513678B2

    公开(公告)日：2022-11-29

    申请号：US15615642

    申请日：2017-06-06

    Applicant: Polycom, Inc.

    Inventor： Alain Nimri ,  Shu Gao ,  Stephen Schaefer ,  Robert Murphy ,  Daniel Palmer

    IPC: G06F3/04883 ,  G06F3/0484 ,  G06F3/041 ,  G06V30/32 ,  G06V30/142

    Abstract: A presentation system capable of detecting one or more gestures and contacts on a touch sensitive display. The presentation system can displaying indicia of such contacts, such as when a user writes with a fingertip, and can remove or alter such indicia responsive to other gestures and contacts. The system can accurately distinguish between types of gestures detected, such as between a writing gesture and an erasing gesture, on both large and small touch sensitive displays, thereby obviating the need for a user to make additional selective inputs to transition from one type of gesture to another. The system can determine how long to keep user annotations displayed during a presentation, based on the nature of the gesture used to make the annotations and the context in which they are made.

    ACOUSTIC PERIMETER FOR REDUCING NOISE TRANSMITTED BY A COMMUNICATION DEVICE IN AN OPEN-PLAN ENVIRONMENT
    116.
    发明申请
    ACOUSTIC PERIMETER FOR REDUCING NOISE TRANSMITTED BY A COMMUNICATION DEVICE IN AN OPEN-PLAN ENVIRONMENT 有权

    公开(公告)号：US20210136490A1

    公开(公告)日：2021-05-06

    申请号：US17085581

    申请日：2020-10-30

    Applicant: Polycom, Inc.

    Inventor： Kwan K. Truong ,  Peter L. Chu ,  Steven L. Potts ,  Eric Elias

    IPC: H04R3/00 ,  G10L21/0208 ,  G10L21/0216 ,  H04R3/04 ,  H04R5/027 ,  H04R5/04

    Abstract: The amount of far-field noise transmitted by a primary communication device in an open-plan office environment is reduced by defining an acoustic perimeter of reference microphones around the primary device. Reference microphones generate a reference audio input including far-field noise in the proximity of the primary device. The primary device generates a main audio input including the voice of the primary speaker as well as background noise. Reference audio input is compared to main audio input to identify the background noise portion of the main audio signal. A noise reduction algorithm suppresses the identified background noise in the main audio signal. The one or more reference microphones defining the acoustic perimeter may be included in separate microphone devices placed in proximity to the main desktop phone, microphones within other nearby desktop telephone devices, or a combination of both types of devices.

    Acoustic perimeter for reducing noise transmitted by a communication device in an open-plan environment
    118.
    发明授权
    Acoustic perimeter for reducing noise transmitted by a communication device in an open-plan environment 有权

    公开(公告)号：US10750282B2

    公开(公告)日：2020-08-18

    申请号：US16723517

    申请日：2019-12-20

    Applicant: Polycom, Inc.

    Inventor： Kwan K. Truong ,  Peter L. Chu ,  Steven L. Potts ,  Eric Elias

    IPC: H04R3/00 ,  G10L21/0208 ,  G10L21/0216 ,  H04R3/04 ,  H04R5/027 ,  H04R5/04 ,  H04R27/00

    Abstract: The amount of far-field noise transmitted by a primary communication device in an open-plan office environment is reduced by defining an acoustic perimeter of reference microphones around the primary device. Reference microphones generate a reference audio input including far-field noise in the proximity of the primary device. The primary device generates a main audio input including the voice of the primary speaker as well as background noise. Reference audio input is compared to main audio input to identify the background noise portion of the main audio signal. A noise reduction algorithm suppresses the identified background noise in the main audio signal. The one or more reference microphones defining the acoustic perimeter may be included in separate microphone devices placed in proximity to the main desktop phone, microphones within other nearby desktop telephone devices, or a combination of both types of devices.

    Methods and system for simulated 3D videoconferencing
    119.
    发明授权
    Methods and system for simulated 3D videoconferencing 有权

    公开(公告)号：US10750124B2

    公开(公告)日：2020-08-18

    申请号：US16391055

    申请日：2019-04-22

    Applicant: Polycom, Inc.

    Inventor： Yaakov Moshe Rosenberg

    IPC: H04N7/15 ,  H04N13/383 ,  G02B30/00 ,  G06F3/01

    Abstract: A system and method for manipulating images in a videoconferencing session provides users with a 3-D-like view of one or more presented sites, without the need for 3-D equipment. A plurality of cameras may record a room at a transmitting endpoint, and the receiving endpoint may select one of the received video streams based upon a point of view of a conferee at the receiving endpoint. The conferee at the receiving endpoint will thus experience a 3-D-like view of the presented site.

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