Patent application number | Description | Published |
20110102934 | CANCELLATION OF TIME-VARYING PERIODIC DISTURBANCES IN SERVO CONTROL SYSTEMS - Various embodiments for addressing time-varying periodic disturbances in a servo control system are provided. Each of a plurality of coefficients is updated based on an estimation of at least one disturbance frequency. The updated plurality of coefficients is provided to at least one peak filter modifying an input signal of the servo control system. The peak filter is operable in view of the updated plurality of coefficients to cancel at least one of the time-varying periodic disturbances. | 05-05-2011 |
20120046762 | PERFORMANCE IMPROVEMENT OF SIGNAL TRANSFORMATION SCHEMES FOR ULTRA-FAST SCANNING - A mechanism for controlling a plant is provided. A reference signal is received at a signal transformation loop of a feedback controller. The signal transformation loop causes the reference signal to include a disturbance signal and a nominal signal. Also, the reference signal is received at a feed-forward controller, and the feed-forward controller recreates the disturbance signal that was caused by the signal transformation loop. The output of the feedback controller is input into a plant. The output of the feed-forward controller is input into the plant such that the disturbance signal is removed from the output of the feedback controller. | 02-23-2012 |
20120268842 | METHOD AND APPARATUS FOR OPERATING A STORAGE DEVICE - Method for operating a storage device with a tape and a head which is operable to read and/or write data from and respectively to the tape. The tape is moveable in a predetermined longitudinal direction. At least two consecutive current lateral tape positions of the tape with respect to a predetermined reference point are determined at a predetermined longitudinal capture position. A tape skew of the tape is determined dependent on the at least two determined lateral positions. The tape skew represents an angle between a current tape motion direction of the tape and the longitudinal direction. A skew control signal is determined dependent on the determined tape skew. A rotational head position of the head is controlled dependent on the skew control signal to align the head to the current tape motion direction in such a way that the head is operable to read and/or write data. | 10-25-2012 |
20120293889 | METHOD AND APPARATUS FOR OPERATING A STORAGE DEVICE - Method for operating a storage device with a tape and a head wherein the head comprises a first and a second read element. Each read element is operable to detect servo-pattern of a particular servo band. The first and the second read element are arranged such that the tape at first passes one of both read elements and subsequently passes the other of both read elements when the tape moves in a predetermined longitudinal direction. A tape transport direction of the tape along the longitudinal direction is determined. The first read element is selected dependent on the determined tape transport direction, when the determined tape transport direction represents a direction where the tape at first passes the first read element and subsequently the second read element. Otherwise the second read element is selected. A position error signal is determined dependent on the selected read element. | 11-22-2012 |
20130021845 | PROGRAMMING AT LEAST ONE MULTI-LEVEL PHASE CHANGE MEMORY CELL - A method is provided that comprises a step of programming the PCM cell to have a respective definite cell state by at least one current pulse flowing to the PCM cell, said respective definite cell state being defined at least by a respective definite resistance level, a step of controlling said respective current pulse by a respective bitline pulse and a respective wordline pulse, and a step of controlling said respective bitline pulse and said respective wordline pulse dependent on an actual resistance value of the PCM cell and a respective reference resistance value being defined for the definite resistance level. | 01-24-2013 |
20130044540 | PROGRAMMING AT LEAST ONE MULTI-LEVEL PHASE CHANGE MEMORY CELL - An apparatus for programming at least one multi-level Phase Change Memory (PCM) cell having a first terminal and a second terminal A programmable control device controls the PCM cell to have a respective cell state by applying at least one current pulse to the PCM cell, the control device controlling the at least one current pulse by applying a respective first pulse to the first terminal and a respective second pulse applied to the second terminal of the PCM cell. The respective cell state is defined by a respective resistance level. The control device receives a reference resistance value defining a target resistance level for the cell, and further receives an actual resistance value of said PCM cell such that the applying the respective first pulse and said respective second pulse is based on said actual resistance value of the PCM cell and said received reference resistance value. | 02-21-2013 |
20130135924 | PROGRAMMING OF PHASE-CHANGE MEMORY CELLS - Methods and apparatus are provided for programming a phase-change memory cell having s>2 programmable cell states. At least one control signal is applied to produce a programming pulse for programming the cell. At least one control signal is varied during the programming pulse to shape the programming pulse in dependence on the cell state to be programmed and produce a selected one of a plurality of programming pulse waveforms corresponding to respective programming trajectories for programming the cell states. The selected programming pulse waveform corresponds to a programming trajectory containing the cell state to be programmed. | 05-30-2013 |
20130197882 | EVALUATING AND OPTIMIZING A TRAJECTORY FUNCTION - A method for evaluating a trajectory function to be followed by a physical system includes providing the trajectory function; determining a set of sampling points by sampling a trajectory based on the trajectory function in the time domain; associating a cell to each of the sampling points; assessing at least one cell metric for each of the cells; aggregating the at least one cell metric of the cells to obtain an aggregated metric measure; and evaluating the trajectory as determined by the provided trajectory function depending on the one or more aggregated metric measures. | 08-01-2013 |
20130318793 | POSITIONING DEVICE FOR SCANNING A SURFACE - A positioning device for scanning a surface includes a movable element; at least one spring-like element having a resilience element for providing a tunable resilience in at least one direction; wherein the spring-like element is configured to tune the resilience by applying a force onto the resilience element of the at least one spring-like element. | 12-05-2013 |
20130321892 | POSITIONING DEVICE FOR SCANNING A SURFACE - A positioning device for scanning a surface includes a movable element; at least one spring-like element having a resilience element for providing a tunable resilience in at least one direction; wherein the spring-like element is configured to tune the resilience by applying a force onto the resilience element of the at least one spring-like element. | 12-05-2013 |
20140029130 | METHOD AND APPARATUS FOR OPERATING A TAPE STORAGE DEVICE - In a method for operating a tape storage device comprising a tape head for reading and/or writing data from/to a tape in the tape storage device, a first tape skew value concerning a skew of the tape is determined and the first tape skew value is converted into a first skew control signal by means of a skew feedback controller. A second tape skew value concerning the skew of the tape is determined, and the second tape skew value is converted into a second skew control signal by means of feed-forward controller. At least one compensation signal for the second skew control signal is determined, and at least one of a rotational orientation of the tape head and a tape motion direction of the tape is controlled dependent on the second skew control signal and the compensation signal in case the first skew control signal fails. | 01-30-2014 |
20140312154 | CONTROLLING THE TRANSPORT OF A TAPE WITHIN A TAPE TRANSPORT SYSTEM - A control device for controlling the transport of a tape within a tape transport system, the tape transport system having a head being operable to read data from and/or write data to the tape, an outboard reel and an inboard reel, wherein the tape is moveable from the outboard reel to the inboard reel in forward direction or from the inboard reel to the outboard reel in reverse direction, wherein the control device is adapted to generate control signals to control the velocity of the outboard reel and the velocity of the inboard reel as a function of a primary velocity of the tape at the head and a secondary velocity of the tape at the inboard reel and/or a secondary velocity of the tape at the outboard reel. | 10-23-2014 |
20150049399 | VIBRATION CONTROL IN DATA STORAGE DEVICES - A storage device has a device body and a read/write head for reading and writing data in a data track of a storage medium. An actuator system is mounted on the device body for effecting movement of the read/write head relative to the data track to align the head with the data track. The actuator system has a plurality of degrees of freedom, and a controller controls the actuator system to effect the movement. A body vibration sensor provided on the device body generates a signal indicative of vibration of the body. An actuator vibration sensor generates a signal indicative of vibration of the actuator system. The controller is adapted to process the signals from the sensors to derive a coupling signal indicative of vibration coupling between the degrees of freedom, and to control the actuator system dependent on the coupling signal and the signal from the body vibration sensor. | 02-19-2015 |
20150062744 | CONTROLLING THE TRANSPORT OF A TAPE WITHIN A TAPE TRANSPORT SYSTEM - A control device for controlling tape transport within a tape transport system is disclosed. The control device includes a determination unit, which includes at least a first servo channel and a second servo channel for determining a first lateral position of a tape relative to the head, and for determining a difference between the first and second lateral positions. A computing unit computes a number of unsupported wraps of the tape as a function of the lateral position difference, wherein the number of unsupported wraps corresponds to the number of layers of the tape around the take-up reel having air layers in-between, and computes a spring constant of the tape as a function of the number of unsupported wraps, a radius of the take-up reel and a nominal tape path length. A calibration unit calibrates at least one unit of the tape transport system dependent on the spring constant. | 03-05-2015 |
20150062747 | ALIGNING A FIRST ELEMENT COUPLED TO AN ACTUATOR WITH A SECOND ELEMENT OF A MAIN SYSTEM - A control system for aligning a first element coupled to an actuator with a second element of a main system includes a position sensor that measures an absolute position of the first element relative to the main system as a sensor signal, a position error signal-based compensator that generates a second control signal as a function of a position error signal, wherein the position error signal indicates a relative position of the first element as a difference between the actual position of the first element and a target position of the first element relative to the second element, a sensor-based compensator that generates a first control signal as a function of the sensor signal and the second control signal, and an actuator that changes the position of the first element relative to the second element dependent on the first control signal to align the first element with the second element. | 03-05-2015 |
Patent application number | Description | Published |
20090080107 | METHOD OF CONTROLLING MOVEMENTS OF A POSITION OF A MICROSCANNER - The invention relates to a method of controlling movements of a positioner of a micro-scanner, the method comprising: determining the vibration resonance frequency ranges of the positioner, and performing a main scan by a controlled movement of the positioner. | 03-26-2009 |
20100201289 | HIGH-SPEED ELECTROSTATIC ACTUATION OF MEMS-BASED DEVICES - A micro-electro mechanical device includes a first structure, a second structure offset from the first structure by a gap. The first structure is configured to be electrostatically actuated to deflect relative to second structure. A pulse generator is configured to combine at least two different pulses to electrostatically drive at least one of the first structure and the second structure between an initial position and a final position. | 08-12-2010 |
20110102937 | POSITIONING COARSE SERVO ACTUATOR OF TAPE SERVO SYSTEM TO ALLOW FINE SERVO ACTUATOR TO FOLLOW TAPE SHIFT EXCURSIONS - Methods, servo systems, and data storage drives follow the lateral shift excursions of longitudinal tape, for example, from flangeless tape guides. A servo sensor is configured to sense lateral position of a tape head with respect to longitudinal servo tracks of the tape, a fine actuator is configured to translate the head laterally, and a coarse actuator is configured to translate the fine actuator laterally. Position error is determined between the head and a desired position related to the servo track, and the fine actuator operated to translate the head laterally to reduce the position error. In the embodiment, lateral shift excursion is sensed from the position error, and the coarse actuator is positioned substantially at a midpoint of the lateral shift excursion. Thus, the fine actuator follows the lateral shift excursions, while the coarse actuator remains at the midpoint. | 05-05-2011 |
20110242884 | Programming at Least One Multi-Level Phase Change Memory Cell - A method of applying at least one programming pulse to the a PCM cell for programming the PCM cell to have a respective definite cell state, the definite cell state being defined by a definite resistance level using an annealing pulse or a melting pulse. The respective definite cell state represents two information entities, a step of applying a first reading pulse to the respective programmed PCM cell to provide a first resistance value, a step of applying at least a second reading pulse to the respective programmed PCM cell to provide a second resistance value, the first reading pulse and the second reading pulse being different pulses; and a step of determining the respective definite cell state of the respective programmed PCM cell dependent on the respective provided first resistance value and the respective provided second resistance value. | 10-06-2011 |
20140016226 | DETERMINING A SKEW ERROR SIGNAL (SES) OFFSET USED TO DETERMINE AN SES TO ADJUST HEADS IN A DRIVE UNIT - Provided are a computer program product, system, and method for determining a skew error signal (SES) offset used to determine an SES to adjust heads in a drive unit. A determination is made of a first difference in a first orientation with respect to a direction of movement of the recordable storage media based on first and second position information read by first and second servo read elements on a first head. A determination is made of a second difference in a second orientation with respect to the direction of movement of the recordable storage media based on third and fourth position information read by the first servo read element and a third servo read element on a second head. An offset, calculated based on the determined first and second difference, is used to generate an error signal to adjust the first and second heads. | 01-16-2014 |
20140268409 | DETERMINING A SKEW ERROR SIGNAL (SES) OFFSET USED TO DETERMINE AN SES TO ADJUST HEADS IN A DRIVE UNIT - Provided are a computer program product, system, and method for determining a skew error signal (SES) offset used to determine an SES to adjust heads in a drive unit. A determination is made of a first difference in a first orientation with respect to a direction of movement of the recordable storage media based on first and second position information read by first and second servo read elements on a first head. A determination is made of a second difference in a second orientation with respect to the direction of movement of the recordable storage media based on third and fourth position information read by the first servo read element and a third servo read element on a second head. An offset, calculated based on the determined first and second difference, is used to generate an error signal to adjust the first and second heads. | 09-18-2014 |
Patent application number | Description | Published |
20110051508 | MULTILEVEL PROGRAMMING OF PHASE CHANGE MEMORY - A method and device for performing a program operation of a phase change memory (PCM) cell. The method includes the steps of applying one or more programming pulses according to a predefined programming scheme to achieve a target resistance level of the PCM cell, wherein the programming scheme is operable to perform in a first programming mode one or more annealing steps to approach the target resistance, wherein the programming scheme is operable to perform in a second programming mode one or more melting steps, wherein the programming scheme is operable to start in the first programming mode and to switch to the second programming mode if the target resistance level of the PCM cell has been undershot in the first programming mode. | 03-03-2011 |
20110069539 | PROGRAMMING MULTI-LEVEL PHASE CHANGE MEMORY CELLS - A method and a feedback controller for programming at least one multi-level phase-change memory cell with a programming signal. The method and feedback controller include a sequence of write pulses applied to the multi-level phase change memory cell, wherein the feedback controller adjusts in real time at least one parameter of each write pulse as a function of a determined resistance error of the phase-change memory cell with respect to a desired reference resistance level. | 03-24-2011 |
20110257768 | CONTROL OF A DYNAMIC SYSTEM CROSS REFERENCE TO RELATED APPLICATION - A control method for tracking a provided reference signal in a dynamical system. The control method includes a control function for controlling a controlled element of the dynamical system, wherein the control function outputs a control signal depending on the reference signal indicating a desired setting of the controlled element and a feedback signal indicating an actual state of the controlled element. An internal state of the control function is modified at one or more discrete time instants while applying the control function at time periods not including the discrete time instants. The modification of the internal state depends on a signal external to the control function. | 10-20-2011 |
20120230081 | CELL-STATE MEASUREMENT IN RESISTIVE MEMORY - Apparatus and method for measuring the state of a resistive memory cell. A bias voltage controller applies a bias voltage to the cell and controls the level of the bias voltage. A feedback signal generator senses cell current due to the bias voltage and generates a feedback signal (S | 09-13-2012 |
20120230097 | DETERMINING CELL-STATE IN PHASE-CHANGE MEMORY - A method, an apparatus, and a device for determining the state of a phase-change memory cell. The method includes the steps of: biasing a cell with a time-varying read voltage (V | 09-13-2012 |
20120230098 | PROGRAMMING OF PHASE-CHANGE MEMORY CELLS - A method and apparatus for programming a phase-change memory cell. A bias voltage signal (V | 09-13-2012 |
20120307554 | DETERMINING CELL-STATE IN PHASE-CHANGE MEMORY - A method, an apparatus, and a device for determining the state of a phase-change memory cell. The method includes the steps of: biasing a cell with a time-varying read voltage (V | 12-06-2012 |
20120314481 | CELL-STATE MEASUREMENT IN RESISTIVE MEMORY - Apparatus and method for measuring the state of a resistive memory cell. A bias voltage controller applies a bias voltage to the cell and controls the level of the bias voltage. A feedback signal generator senses cell current due to the bias voltage and generates a feedback signal (S | 12-13-2012 |
20120327709 | PROGRAMMING OF PHASE-CHANGE MEMORY CELLS - A method and apparatus for programming a phase-change memory cell. A bias voltage signal (V | 12-27-2012 |
20130077394 | MULTILEVEL PROGRAMMING OF PHASE CHANGE MEMORY - A method and device for performing a program operation of a phase change memory (PCM) cell. The method includes the steps of applying one or more programming pulses according to a predefined programming scheme to achieve a target resistance level of the PCM cell, wherein the programming scheme is operable to perform in a first programming mode one or more annealing steps to approach the target resistance, wherein the programming scheme is operable to perform in a second programming mode one or more melting steps, wherein the programming scheme is operable to start in the first programming mode and to switch to the second programming mode if the target resistance level of the PCM cell has been undershot in the first programming mode. | 03-28-2013 |
20130083594 | MULTILEVEL PROGRAMMING OF PHASE CHANGE MEMORY - A method and device for performing a program operation of a phase change memory (PCM) cell. The method includes the steps of applying one or more programming pulses according to a predefined programming scheme to achieve a target resistance level of the PCM cell, wherein the programming scheme is operable to perform in a first programming mode one or more annealing steps to approach the target resistance, wherein the programming scheme is operable to perform in a second programming mode one or more melting steps, wherein the programming scheme is operable to start in the first programming mode and to switch to the second programming mode if the target resistance level of the PCM cell has been undershot in the first programming mode. | 04-04-2013 |
20130335857 | VIBRATION DISTURBANCE ESTIMATION AND CONTROL - A tape drive configured to accurately position a head actuator in the presence of physical disturbances is disclosed. The tape drive includes a track-follow controller to position a head actuator over data tracks on magnetic tape. The tape drive further includes a disturbance observer configured to estimate a vibration disturbance and output a compensation signal to assist the track-follow controller to accurately position the head actuator over the data tracks in the presence of vibration. When estimating the vibration disturbance, the disturbance observer takes into account vibration frequency characteristics, such as frequency characteristics derived from a vibration specification associated with the tape drive, or frequency characteristics derived from known vibration disturbances experienced by the tape drive. A corresponding method is also disclosed. | 12-19-2013 |