公开(公告)号：US20210049791A1

公开(公告)日：2021-02-18

申请号：US17041934

申请日：2019-03-28

Applicant: NOKIA TECHNOLOGIES OY

Inventor： Xin YUAN ,  Shirin JALALI

IPC: G06T9/00 ,  H03M7/30 ,  G06T11/00 ,  G06T7/00

Abstract: A method is provided for decompressing images captured by a compressive imaging system in conjunction with a compressive imaging application. The method comprises determining an estimation error et based on a difference between: (i) a measurement y captured by the compressive imaging system and (ii) a product of a sensing matrix H and a signal xt that has been estimated. The method comprises determining a gradient descent st+1 based on a sum of: (i) the signal xt that has been estimated and (ii) a product of a step size μ, a vector formulation of the sensing matrix HT and the estimation error et. The method comprises projecting the gradient descent st+1 comprising applying a compression function f and a decompression function g to estimate the signal xt+1. The method comprises iteratively repeating determining the estimation error et; determining the gradient descent st+1 and projecting the gradient descent st+1 to provide a reconstructed signal following a final iteration; and providing the reconstructed signal for display or storage.

公开(公告)号：US20230051021A1

公开(公告)日：2023-02-16

申请号：US17747110

申请日：2022-05-18

Applicant: Nokia Technologies Oy

Inventor： Carl NUZMAN ,  Shirin JALALI

IPC: H04M9/08 ,  H04R3/00 ,  H04R3/12

Abstract: An AEC system can implement different updating techniques for echo cancellation. A Block Maximum Likelihood updating technique updates filter coefficients typically at integer multiples of a block size. A Proportional-Incremental Maximum Likelihood updating technique applies proportional weighting to the updates of filter coefficients. A Multi-source Incremental Maximum Likelihood updating technique uses separate control parameters associated with each of multiple loudspeakers. Combinations of these may be used, and one or more of these can be selected and implemented in real-time.

公开(公告)号：US20230046637A1

公开(公告)日：2023-02-16

申请号：US17393904

申请日：2021-08-04

Applicant: Nokia Technologies Oy

Inventor： Carl NUZMAN ,  Shirin JALALI

IPC: H04M3/00

Abstract: Echo cancellation for a two-way audio communication includes receiving, at an AEC system from microphone(s), an audio signal based on, at least in part, near-end signals and reproduced far-end signals. Loudspeaker(s) reproduced the far-end signals. The AEC system is operated, at least in part, with filter(s) so as to update estimates of coefficients of an acoustic channel from the loudspeaker(s) to the microphone(s). Control parameter(s) affecting an operation of the AEC system that is/are configurable and is/are set to value(s), from a range of values, is/are determined, based on estimating an accuracy of the estimates of the coefficients of the acoustic channel and a characteristic of the near-end signals. The AEC system controls the filter(s) with different values of the control parameter(s) at different times.