Patent application number | Description | Published |
20080320362 | Multilevel Low Density Parity-Check Coded Modulation - A method and apparatus are provided for encoding and decoding a communication signal. Processes for encoding and decoding the communication signal use a first low density parity-check code (LDPC) construction and a second low density parity-check code construction that differs from the first low density parity-check code construction. Multilevel coding (MLC) is applied to protect each address bit of a signal point by an individual LDPC code. In one embodiment, the first level is coded with a progressive edge-growth LDPC code, the second level is coded with a Reed-Solomon LDPC code and the third level is left uncoded. | 12-25-2008 |
20090219984 | Autoregressive Moving Average Modeling for Feedforward and Feedback Tomlinson-Harashima Precoder Filters - Apparatus and methods provide a Tomlinson-Harashima precoder scheme in which a feedback filter may be constructed to match an approximated feedforward filter, where the feedforward filter is approximated using autoregressive moving average modeling. | 09-03-2009 |
20090274239 | Prescribed Response Precoding for Channels with Intersymbol Interference - Methods and apparatus are provided for prescribed response precoding schemes for signal transmission in channels with intersymbol interference. An embodiment includes generating a prescribed feedback filter polynomial as the quotient of a feedback filter polynomial and a target polynomial to form a feedback filter in a precoder, where the target polynomial is a divisor of the feedback filter polynomial. | 11-05-2009 |
20100150264 | Precoder Design for Different Channel Lengths - Apparatus and methods construct parameters for a unit associated with a precoder to a channel. Embodiments include forming a plurality of values for precoder constructions, where the values may be obtained from applying a transmission quality criterion to each precoder construction for varying channels lengths. Each precoder construction may be built for a predetermined channel length with a different channel length for each precoder construction. A subset of the precoder constructions operate substantially over the entire distance range covered by the varying channels lengths. | 06-17-2010 |
Patent application number | Description | Published |
20100098323 | Method and Apparatus for Determining 3D Shapes of Objects - An apparatus and method determine a 3D shape of an object in a scene. The object is illuminated to cast multiple silhouettes on a diffusing screen coplanar and in close proximity to a mask. A single image acquired of the diffusing screen is partitioned into subview according to the silhouettes. A visual hull of the object is then constructed according to isosurfaces of the binary images to approximate the 3D shape of the object. | 04-22-2010 |
20130307919 | MULTIPLE CAMERA VIDEO CONFERENCING METHODS AND APPARATUS - In some aspects, a multi-camera device to facilitate multiple camera video conferencing is provided. The multi-camera device comprises a plurality of input ports, each configured to receive video information when connected to a respective external video camera, an output port configured to output video information, and a selection component coupled to the plurality of input ports and the output port, the selection component configured to provide video information received by at least one of the input ports to the output port for output to an external computer. | 11-21-2013 |
20140078260 | METHOD FOR GENERATING AN ARRAY OF 3-D POINTS - A method that estimates the coordinates of the calibration points in the projector image plane using local homographies obtained from the imaging camera. First, a dense set of correspondences between projector and camera pixels is found by projecting onto the calibration object an identical pattern sequence as the one later projected when scanning the target, reusing most of the software components written for the scanning application. Second, the set of correspondences is used to compute a group of local homographies that allow projection back of any of the points in the calibration object onto the projector image plane with sub-pixel precision. In the end, the data projector is then calibrated as a normal camera. | 03-20-2014 |
20140172377 | METHOD TO RECONSTRUCT A SURFACE FROM ORIENTED 3-D POINTS - A method for the problem of reconstructing a watertight surface defined by an implicit equation from a finite set of oriented points. As in other surface reconstruction approaches disctretizations of this continuous formulation reduce to the solution of sparse least-squares problems. Rather than forcing the implicit function to approximate the indicator function of the volume bounded by the surface, in the present formulation the implicit function is a smooth approximation of the signed distance function to the surface. Then solution thus introduced is a very simple hybrid FE/FD discretization, which together with an octree partitioning of space, and the Dual Marching Cubes algorithm produces accurate and adaptive meshes. | 06-19-2014 |