Sefa Demirtas

20130116947, May 9, 2013

Nov 9, 2011

13/292201

Zafer Sahinoglu - Cambridge MA, US
Sefa Demirtas - Brighton MA, US

G06F 19/00
G01R 31/00
G01R 25/00

702 58, 324 86, 702 60

A method for detecting unbalance in a 3-phase voltage signal is disclosed. The method includes determining an unbalance indicator as a value of a square of an amplitude of a positive sequence of the voltage signal; and comparing the unbalance indicator with a threshold to determine unbalance of the voltage signal.

20230055829, Feb 23, 2023

Aug 22, 2022

17/892405

- Wilmington MA, US
Brian C. DONNELLY - Sudbury MA, US
Nicolas LE DORTZ - Jamaica Plain MA, US
Sefa DEMIRTAS - Winchester MA, US

Analog Devices, Inc. - Wilmington MA

G06T 7/80
G01S 7/497
G01S 17/89

An image processing system having on-the-fly calibration uses the placement of the imaging sensor and the light source for calibration. The placement of the imaging sensor and light source with respect to each other affect the amount of signal received by a pixel as a function of distance to a selected object. For example, an obstruction can block the light emitter, and as the obstruction is positioned an increasing distance away from the light emitter, the signal level increases as light rays leave the light emitters, bounce off the obstruction and are received by the imaging sensor. The system includes a light source configured to emit light, and an image sensor to collect incoming signals including reflected light, and a processor to determine a distance measurement at each of the pixels and calibrate the system.

20200256999, Aug 13, 2020

Feb 6, 2020

16/783975

Atulya Yellepeddi - Cambridge MA, US
Ravi Kiran Raman - Cambridge MA, US
Jennifer Tang - Norwood MA, US
Sefa Demirtas - Winchester MA, US
Miles R. Bennett - Stanford CA, US
Christopher Barber - Roslindale MA, US

G01S 17/894
G01S 17/931
G01S 7/48
G01S 17/58

A Laser Imaging Detection and Ranging (LIDAR) system comprises a memory configured to store LIDAR measurement data obtained by the LIDAR system representative of a three-dimensional (3D) space in a field of view of the LIDAR system and signal processing circuitry. The signal processing circuitry is and configured to convert the LIDAR measurement data to a voxel characteristic of voxels of the 3D space, process and adjust a voxel characteristic of a first voxel of the 3D space using a voxel characteristic of other voxels within a specified distance of the first voxel in the 3D space, continue to process and adjust the voxel characteristics of all voxels in the 3D space, and generate an indication of presence of an object in the field of view according to the adjusted voxel characteristics.

20200193640, Jun 18, 2020

Oct 25, 2019

16/664453

- Norwood MA, US
Brian C. DONNELLY - Sudbury MA, US
Nicolas LE DORTZ - Cambridge MA, US
Sefa DEMIRTAS - Winchester MA, US

Analog Devices, Inc. - Norwood MA

G06T 7/80
G01S 7/497

An image processing system having on-the-fly calibration uses the placement of the imaging sensor and the light source for calibration. The placement of the imaging sensor and light source with respect to each other affect the amount of signal received by a pixel as a function of distance to a selected object. For example, an obstruction can block the light emitter, and as the obstruction is positioned an increasing distance away from the light emitter, the signal level increases as light rays leave the light emitters, bounce off the obstruction and are received by the imaging sensor. The system includes a light source configured to emit light, and an image sensor to collect incoming signals including reflected light, and a processor to determine a distance measurement at each of the pixels and calibrate the system.

20190391238, Dec 26, 2019

Apr 17, 2019

16/387385

- Norwood MA, US
Charles MATHY - Arlington MA, US
Sefa DEMIRTAS - Winchester MA, US

Analog Devices, Inc. - Norwood MA

G01S 7/48
H04N 5/225
H04N 5/243
G01S 17/89
G01S 17/10

Depth imagers can implement time-of-flight operations to measure depth or distance of objects. A depth imager can emit light onto a scene and sense light reflected back from the objects in the scene using an array of sensors. Timing of the reflected light hitting the array of sensors gives information about the depth or distance of objects in the scene. In some cases, corrupting light that is outside of a field of view of a pixel in the array of sensors can hit the pixel due to internal scattering or internal reflections occurring in the depth imager. The corrupting light can corrupt the depth or distance measurement. To address this problem, an improved depth imager can isolate and measure the corrupting light due to internal scattering or internal reflections occurring in the depth imager, and systematically remove the measured corrupting light from the depth or distance measurement.

20190293689, Sep 26, 2019

Jun 8, 2018

16/003701

- Hamilton, BM
Yogesh Jayaraman Sharma - Santa Clara CA, US
Sefa Demirtas - Winchester MA, US
Jochen Schmitt - Biedenkopf, DE
Paul Blanchard - Westford MA, US
Arthur J. Kalb - Santa Clara CA, US
Harvey Weinberg - Sharon MA, US
Jonathan Ephraim David Hurwitz - Edinburgh, GB

Analog Devices Global Unlimited Company - Hamilton

G01R 15/20
G01R 33/07
G01R 33/09

Embodiments of the present disclosure provide mechanisms for measuring currents flowing in one or more conductor wires. The mechanisms are based on using magnetic sensor pairs arranged within a housing with an opening for the wires, where each magnetic sensor pair can generate a pair of signals indicative of magnetic fields in two different directions. The outputs of the sensor pairs can be used to derive a measure of current(s) flowing through the one or more wires. The use of magnetic sensor pairs that can measure magnetic field in two different directions may enable simultaneous current measurement in multiple wires placed within the opening, improve accuracy of current measurements while relaxing requirements for precise control of the placement of the wire(s), reduce the impact of stray magnetic interference, and enable both AC and DC measurements.

20170317701, Nov 2, 2017

Sep 21, 2016

15/271487

- NORWOOD MA, US
SEFA DEMIRTAS - MALDEN MA, US

ANALOG DEVICES, INC. - NORWOOD MA

H04B 1/10
H04L 25/03
H04B 1/10

Embodiments of the present disclosure provide mechanisms that enable designing an FIR filter that would have a guaranteed globally optimal magnitude response in terms of the minimax optimality criterion given a desired weight on the error in the stopband versus the passband. Design of such a filter is based on a theorem (“characterization theorem”) that provides an approach for characterizing the global minimax optimality of a given FIR filter h[n], n=0, 1, . . . , N, where optimality is evaluated with respect to a magnitude response of this filter, |H(e)|, as compared to the desired filter response, D(ω), which is unity in the passband and zero in the stopband. The characterization theorem enables characterizing optimality for both real-valued and complex-valued filter coefficients, and does not require any symmetry in the coefficients, thus being applicable to all non-linear phase FIR filters.

20170272651, Sep 21, 2017

Mar 14, 2017

15/458536

- Norwood MA, US
Sefa DEMIRTAS - Malden MA, US
Bin HUO - Wayland MA, US
Dhruvesh GAJARIA - North Reading MA, US
Jonathan Ari GOLDBERG - Lexington MA, US
Nicolas LE DORTZ - Cambridge MA, US
Tao YU - Cambridge MA, US
James NORAKY - Cambridge MA, US

Analog Devices, Inc. - Norwood MA

H04N 5/232
H04N 13/00
H04N 13/02

Aspects of the embodiments are directed to passive depth determination. Initially, a high power depth map of a scene can be created. An object in the scene can be identified, such as a rigid body or other object or portion of an object. A series of lower power or RGB images can be captured. The object can be located in one or more of the lower power or RGB images. A change in the position of an object, represented by a set of pixels, can be determined. From the change in position of the object, a new depth of the object can be extrapolated. The extrapolated depth of the object can be used to update the high power depth map.