Patent application number | Description | Published |
20090175234 | Enhanced Sub-Frame-Based-Framing for Wireless Communications - A method of performing wireless communications. The method comprises, at a transmitting station, encoding a plurality of symbols into a frame. The method further comprises, from the transmitting station, transmitting the frame via a wireless communication to a receiving station. The frame comprises a plurality of sub-frames, wherein a first sub-frame in the plurality of sub-frames consists of a first number of symbols and a second sub-frame in the plurality of sub-frames consists of a second number of symbols. Finally, the first number differs from the second number. | 07-09-2009 |
20100249594 | ITERATIVE TIME DELAY VALUES FOR ULTRASOUND BEAMFORMING - An iterative method of computing time delay values for ultrasound receive beamforming. Sensing signals are generated by transducer elements in a transducer array which detect reflected sound waves from a target tissue region for a time sample (n) for a first focal point and at a later time sample (n+1) for a second focal point. Respective time delays are calculated for time sample (n) for sensing signals received from the transducer elements for focusing the reflected sound waves from the first focal point. For the later time sample (n+1), respective time delays are calculated for the sensing signals received from the transducer elements for focusing the reflected sound waves from the second focal point, wherein the respective time delays for time sample (n+1) are computed iteratively from the respective time delays for time sample (n). | 09-30-2010 |
20100249596 | RECEIVE BEAMFORMER FOR ULTRASOUND HAVING DELAY VALUE SORTING - A method of processing ultrasound signals received from a plurality of data channels each associated with a transducer element. A sorted delay data table having sorted delay data is generated that includes a channel identifier, a fractional delay value, and integer delay value. The sorted delay data table clusters together channel groups including a first channel group having data channels with the first fractional delay value and a second channel group with data channels with the second fractional delay value. Control signals are generated based on the sorted delay data that implements data path combining by directing channel data from the first channel group for processing by a first interpolation filter that provides the first fractional delay value and channel data associated with the second channel group for processing by a second interpolation filter that provides the second fractional delay value. Summing signals output by the first and second interpolation filter forms the ultrasound beamformed signal. | 09-30-2010 |
20110219053 | RECURSIVE TAYLOR SERIES-BASED COMPUTATION OF NUMERICAL VALUES FOR MATHEMATICAL FUNCTIONS - A recursive method for computing numerical values for mathematical functions includes providing a recursive Taylor series representation of a mathematical function f(x) of a variable x evaluated around a given operating point a. The recursive Taylor series representation includes a plurality of derivative derived terms that include ratios of derivatives of f(x) evaluated at the operating point a. Coefficient data is determined from ones of the derivative derived terms stored in a tangible memory device evaluated at the operating point a over a predetermined range. An approximation for the mathematical function f(x) is computed using the recursive Taylor series representation evaluated with the coefficient data. | 09-08-2011 |
20120143059 | DYNAMIC APERTURE CONTROL AND NORMALIZATION FOR APODIZATION IN BEAMFORMING - A method of apodizing for ultrasound beamforming includes providing filtered digital channel data representing echo data from target tissue in a plurality (k) of data channels and a predefined number of active channels (N | 06-07-2012 |
20150084575 | Angle/Frequency Selector in an Electric Motor Controller Architecture - A motor controller architecture and method of operating the same. The motor controller includes a function for estimating the low speed operation of the motor, for example by evaluating the response to a periodic excitation signal injected into the control loop of the controller architecture. A periodic excitation signal in the form of a square wave allows for analysis of the response of the motor without requiring demodulation, which allows the frequency of the excitation signal to be above the audible range. Control logic for controlling the motor at transitional speeds between low speed control and high speed (back emf) control is provided in some embodiments. | 03-26-2015 |
20150084576 | Low Speed and High Speed Controller Architecture for Electric Motors - A motor controller architecture and method of operating the same. The motor controller includes a function for estimating the low speed operation of the motor, for example by evaluating the response to a periodic excitation signal injected into the control loop of the controller architecture. A periodic excitation signal in the form of a square wave allows for analysis of the response of the motor without requiring demodulation, which allows the frequency of the excitation signal to be above the audible range. Control logic for controlling the motor at transitional speeds between low speed control and high speed (back emf) control is provided in some embodiments. | 03-26-2015 |
20150097500 | STATOR RESISTANCE ESTIMATION FOR ELECTRIC MOTORS - A method of controlling an electric motor (motor) includes providing a processor having an associated memory storing a stator resistance (Rs) estimation (RSE) algorithm that is programmed to implement the RSE algorithm to execute steps including injecting a current waveform at an arbitrary frame of reference into the stator using a field-oriented-control (FOC) motor controller including an Id controller and an Iq controller, and measuring current and voltage values from the motor responsive to the injecting. The measured current and voltage values are then transformed into transformed current and voltage values in a d/q coordinate system. The transformed current and voltage values are low pass filtered to generate filtered d/q current and voltage values, and a value for Rs is estimated from the filtered d/q current and voltage values. The arbitrary frame of reference can be a time-varying frame of reference. | 04-09-2015 |