Showing papers on "Signal published in 2009"

Display device and driving method thereof

Abstract: PROBLEM TO BE SOLVED: To provide a display device capable of improving a display quality by speedily performing the falling of a gate signal by a gate driving part. SOLUTION: In the display device, a signal supply part maintains a clock signal and a clock bar signal having an inverse phase to that of the clock signal alternately at a high level and a low level. Further, the signal supply part maintains a scan-start signal at the high level from the first fall to at least the subsequent fall. Accordingly, a pulse width of the scan-start signal becomes longer than two times of horizontal period. The gate driving part outputs the gate signal in order from the heading gate line in accordance with rise of the scan-start signal. Especially while the scan-start signal is maintained at the high level, the gate driving part continues to output the clock signal for the heading gate line as the gate signal. COPYRIGHT: (C)2009,JPO&INPIT

Ultrasonic device for cutting and coagulating with stepped output

Abstract: Various embodiments are directed to an apparatus, system, and method for driving an end effector coupled to an ultrasonic transducer in a surgical instrument. The method comprises generating a first ultrasonic drive signal by a generator coupled to an ultrasonic drive system, actuating the ultrasonic transducer with the first ultrasonic drive signal for a first period, generating a second ultrasonic drive signal by the generator, and actuating the ultrasonic transducer with the second ultrasonic drive signal for a second period, subsequent to the first period. The first drive signal is different from the second drive signal over the respective first and second periods. The first and second drive signals define a step function waveform over the first and second periods. The apparatus comprises a generator configured to couple to an ultrasonic instrument. The system comprises a generator coupled to an ultrasonic instrument. The ultrasonic instrument comprises an ultrasonic drive system comprising an ultrasonic transducer coupled to a waveguide and an end effector coupled to the waveguide, and wherein the ultrasonic drive system is configured to resonate at a resonant frequency.

Blind Multiband Signal Reconstruction: Compressed Sensing for Analog Signals

Abstract: We address the problem of reconstructing a multiband signal from its sub-Nyquist pointwise samples, when the band locations are unknown. Our approach assumes an existing multi-coset sampling. To date, recovery methods for this sampling strategy ensure perfect reconstruction either when the band locations are known, or under strict restrictions on the possible spectral supports. In this paper, only the number of bands and their widths are assumed without any other limitations on the support. We describe how to choose the parameters of the multi-coset sampling so that a unique multiband signal matches the given samples. To recover the signal, the continuous reconstruction is replaced by a single finite-dimensional problem without the need for discretization. The resulting problem is studied within the framework of compressed sensing, and thus can be solved efficiently using known tractable algorithms from this emerging area. We also develop a theoretical lower bound on the average sampling rate required for blind signal reconstruction, which is twice the minimal rate of known-spectrum recovery. Our method ensures perfect reconstruction for a wide class of signals sampled at the minimal rate, and provides a first systematic study of compressed sensing in a truly analog setting. Numerical experiments are presented demonstrating blind sampling and reconstruction with minimal sampling rate.

Speech signal processing

Abstract: A speech signal processing system comprises an audio processor (103) for providing a first signal representing an acoustic speech signal of a speaker. An EMG processor (109) provides a second signal which represents an electromyographic signal for the speaker captured simultaneously with the acoustic speech signal. A speech processor (105) is arranged to process the first signal in response to the second signal to generate a modified speech signal. The processing may for example be a beam forming, noise compensation, or speech encoding. Improved speech processing may be achieved in particular in an acoustically noisy environment.

Method and system of regulating voltages

Abstract: Regulating voltages At least some of the illustrative embodiments are systems including a switching circuit configured to produce an intermediate voltage signal from an input voltage signal, and a first voltage regulator coupled the switching circuit and configured to produce a first regulated voltage signal from the intermediate voltage signal The switching circuit is configured to create the intermediate voltage signal based on a switching signal having a duty cycle, and wherein the duty cycle of the switching signal is open-loop with respect the intermediate voltage signal and the first regulated voltage signal

Rotating transducer mount for ultrasonic surgical instruments

Abstract: In one general aspect, various embodiments are directed to an ultrasonic surgical instrument that comprises a handpiece housing that operably supports an electrical contact assembly therein that is in electrical communication with a signal source. An acoustic assembly is supported within the handpiece housing in rotatable contact with the electrical contact assembly. In various embodiments, the signal source produces at least one of an ultrasonic signal and a radio frequency signal.

Graphene Frequency Multipliers

Abstract: In this letter, the ambipolar transport properties of graphene flakes have been used to fabricate full-wave signal rectifiers and frequency-doubling devices. By correctly biasing an ambipolar graphene field-effect transistor in common-source configuration, a sinusoidal voltage applied to the transistor gate is rectified at the drain electrode. Using this concept, frequency multiplication of a 10-kHz input signal has been experimentally demonstrated. The spectral purity of the 20-kHz output signal is excellent, with more than 90% of the radio-frequency power in the 20-kHz frequency. This high efficiency, combined with the high electron mobility of graphene, makes graphene-based frequency multipliers a very promising option for signal generation at ultrahigh frequencies.

Gate driving circuit and display apparatus having the same

Abstract: A gate driving circuit includes a shift register in which the stages are connected to each other one after another. An m-th stage includes a pull-up section outputting a high voltage of a first clock signal as a gate signal in response to a voltage of a first node, a pull-down section pulling down the gate signal to an off voltage in response to the first clock signal or the second clock signal, a driving section turning on and turning off the pull-up section and a holding section maintaining a voltage of the first node at the off voltage in response to the first clock signal, and a voltage maintenance section blocking a leakage current through the pull-up driving section and the holding section during an output interval of the gate signal to delay a voltage drop of the first node.

Multiple microphone switching and configuration

Abstract: A mobile communications device contains at least two microphones. One microphone is designated by a selector to provide a voice dominant signal and another microphone is designated to provide a noise or echo dominant signal, for a call or a recording. The selector communicates the designations to a switch that routes the selected microphone signals to the inputs of a processor for voice signal enhancement. The selected voice dominant signal is then enhanced by suppressing ambient noise or canceling echo therein, based on the selected noise or echo dominant signal. The designation of microphones may change at any instant during the call or recording depending on various factors, e.g. based on the quality of the microphone signals. Other embodiments are also described.

Technique for conveying a wireless-standard signal through a barrier

Abstract: The RF signal generated by a ZigBee radio on the outside of a building structure is conveyed to the interior of the building by guiding it along an electric cable bundle that passes through the building's wall to supply domestic electric power to the interior of the structure. The RF signal is launched by a unique coupler comprising a pair of insulated foil conductors.

Using an electric power cable as the vehicle for communicating an information-bearing signal through a barrier

Abstract: The RF signal generated by a ZigBee radio on the outside of a building structure is conveyed to the interior of the building by guiding it as a surface wave along an electric cable bundle that passes through the building's wall to supply domestic electric power to the interior of the structure. The RF signal is launched by a unique coupler comprising a pair of insulated foil conductors.

Using surface wave propagation to communicate an information-bearing signal through a barrier

Abstract: The RF signal generated by a ZigBee radio on the outside of a building structure is conveyed to the interior of the building by guiding it along an electric cable bundle that passes through the building's wall to supply domestic electric power to the interior of the structure. The RF signal is launched by a unique coupler comprising a pair of insulated foil conductors.

Waveform inversion in laplace-fourier domain

Abstract: Disclosed are an apparatus and method for visualizing subsurface velocity structure by processing signals through waveform inversion in the Laplace-Fourier domain, and a recording medium storing a program for implementing the method. A receiver receives a seismic signal from a target region, and a signal processor processes the seismic signal to generate image data for visualizing the subsurface structure of the target region. The signal processor performs the waveform inversion in the Laplace-Fourier domain, thereby obtaining a velocity model similar to an true structure of the target region.

Audio Channel Assignment for Audio Output in a Movable Device

Abstract: A device that provides an audio output includes a speaker array mechanically fixed to the device. The speaker array includes at least three speakers. An orientation sensor detects an orientation of the speaker array and provides an orientation signal. An audio receiver receives a number of audio signals that include spatial position information. An audio processor is coupled to the speakers, the orientation sensor, and the audio receiver. The audio processor receives the audio signals and the orientation signal, and selectively routes the audio signals to the speakers according to the spatial position information and the orientation signal such that the spatial position information is perceptible to a listener. The orientation signal may be provided by a compass, an accelerometer, an inertial sensor, or other device. The orientation signal may be provided according to selection of display orientation, shape of touch input, image recognition of the listener, or the like.

Signal and Power Integrity - Simplified

Abstract: The #1 Practical Guide to Signal Integrity DesignNow Updated with Extensive New Coverage!This book brings together up-to-the-minute techniques for finding, fixing, and avoiding signal integrity problems in your design. Drawing on his work teaching more than five thousand engineers, world-class signal and power integrity expert Eric Bogatin systematically reviews the root causes of all six families of signal integrity problems and shows how to design them out early in the design cycle. This editions extensive new content includes a brand-new chapter on S-parameters in signal integrity applications, and another on power integrity and power distribution network designtopics at the forefront of contemporary electronics design.Coverage includesA fully up-to-date introduction to signal integrity and physical designHow design and technology selection can make or break the performance of the power distribution networkExploration of key concepts, such as plane impedance, spreading inductance, decoupling capacitors, and capacitor loop inductancePractical techniques for analyzing resistance, capacitance, inductance, and impedanceSolving signal integrity problems via rules of thumb, analytic approximation, numerical simulation, and measurementUnderstanding how interconnect physical design impacts signal integrityManaging differential pairs and lossesHarnessing the full power of S-parameters in high-speed serial link applicationsEnsuring power integrity throughout the entire power distribution pathRealistic design guidelines for improving signal integrity, and much moreUnlike books that concentrate on theoretical derivation and mathematical rigor, this book emphasizes intuitive understanding, practical tools, and engineering discipline. Designed for electronics industry professionals from beginners to experts it will be an invaluable resource for getting signal integrity designs right the first time, every time.

Touch-sensitive display method and apparatus

Abstract: A portable electronic device comprises at least one force sensor configured to generate a force signal based at least in part on a force applied to a touch-sensitive display and a processor configured to receive the force signal and to provide a feedback signal when the force exceeds a force threshold. The at least one force sensor may be integrated into the touch-sensitive display.

Flexible electrical recording from cells using nanowire transistor arrays.

Abstract: Semiconductor nanowires (NWs) have unique electronic properties and sizes comparable with biological structures involved in cellular communication, thus making them promising nanostructures for establishing active interfaces with biological systems. We report a flexible approach to interface NW field-effect transistors (NWFETs) with cells and demonstrate this for silicon NWFET arrays coupled to embryonic chicken cardiomyocytes. Cardiomyocyte cells were cultured on thin, optically transparent polydimethylsiloxane (PDMS) sheets and then brought into contact with Si-NWFET arrays fabricated on standard substrates. NWFET conductance signals recorded from cardiomyocytes exhibited excellent signal-to-noise ratios with values routinely >5 and signal amplitudes that were tuned by varying device sensitivity through changes in water gate–voltage potential, Vg. Signals recorded from cardiomyocytes for Vg from −0.5 to +0.1 V exhibited amplitude variations from 31 to 7 nS whereas the calibrated voltage remained constant, indicating a robust NWFET/cell interface. In addition, signals recorded as a function of increasing/decreasing displacement of the PDMS/cell support to the device chip showed a reversible >2× increase in signal amplitude (calibrated voltage) from 31 nS (1.0 mV) to 72 nS (2.3 mV). Studies with the displacement close to but below the point of cell disruption yielded calibrated signal amplitudes as large as 10.5 ± 0.2 mV. Last, multiplexed recording of signals from NWFET arrays interfaced to cardiomyocyte monolayers enabled temporal shifts and signal propagation to be determined with good spatial and temporal resolution. Our modular approach simplifies the process of interfacing cardiomyocytes and other cells to high-performance Si-NWFETs, thus increasing the experimental versatility of NWFET arrays and enabling device registration at the subcellular level.

Compressive wide-band spectrum sensing

Abstract: We present a compressive wide-band spectrum sensing scheme for cognitive radios. The received analog signal at the cognitive radio sensing receiver is transformed in to a digital signal using an analog-to-information converter. The autocorrelation of this compressed signal is then used to reconstruct an estimate of the signal spectrum. We evaluate the performance of this scheme in terms of the mean squared error of the power spectrum density estimate and the probability of detecting signal occupancy.

A flow sensor system

Abstract: There is provided a flow sensor system for sensing fluid flow indicative of a puff in an aerosol generating system. The sensor system includes a sensing circuit comprising a sensing resistor and a voltage output. The sensing resistor is arranged to detect fluid flow based on a change in resistance. The sensing circuit is arranged such that the change in resistance of the sensing resistor causes a change in the voltage output. The sensor system also includes a signal generator arranged to supply a pulsed driving signal to the sensing circuit for powering the sensing circuit. The sensing circuit is powered when the pulsed driving signal is high and not powered when the pulsed driving signal is low. The sensor system is arranged to operate in a first mode, in which no puff is expected or detected and in which the pulsed driving signal has a first frequency, and a second mode, in which a puff is expected or detected and in which the pulsed driving signal has a second frequency, greater than the first frequency.

Magnetic induction signal repeater

Abstract: A magnetic induction (MI) repeater includes first and second coils configured to have the same resonance frequency and to be substantially isolated from one another, and an amplifier connected to the first and second coils and configured to receive a signal induced in the first coil by a first magnetic field and output, via the second coil, a second magnetic field based on the signal, wherein the second magnetic field is amplified relative to the first magnetic field.

Method and apparatus for transmitting signal in wireless communication system

Abstract: A method of transmitting a signal of a base station in a wireless communication system is provided. The method includes transmitting a first signal to the relay station through the transmission period in a subframe including a transmission period and a guard time for transmission/reception switching of a relay station, and transmitting a second signal to a macro user equipment through the guard time. Accordingly, a signal can be effectively transmitted in the wireless communication system employing the relay station.

Impedance monitoring apparatus, system, and method for ultrasonic surgical instruments

Abstract: In one general aspect, various embodiments are directed to a surgical instrument that can supply mechanical energy and electrical energy to an end effector of the surgical instrument. The surgical instrument comprises an ultrasonic generator module coupled to an ultrasonic drive system, which comprises an ultrasonic transducer coupled to a waveguide and an end effector coupled to the waveguide. The ultrasonic drive system is configured to resonate mechanically at a resonant frequency to generate a first ultrasonic drive signal. An electronic circuit is coupled to the ultrasonic generator module to monitor an electrical characteristic of the ultrasonic drive system. A processor is coupled to the electronic circuit to control the ultrasonic drive signal in response to the monitored electrical characteristic of the ultrasonic drive system.

Systems and methods for assessing locations of multiple touch inputs

Abstract: Matrix-based touch input systems assess touch locations of two or more temporally overlapping touch inputs by forming valid x-y coordinate pairs from independently determined x- and y-coordinates. Valid x-y pairs are formed based on comparing one or more signal parameters such as signal magnitude, signal strength, signal width, and signal rates of change. In matrix capacitive systems where capacitance-to-ground signals are used to determine the x- and y-coordinates, the determined coordinates may be formed into valid x-y pairs using mutual capacitance measurements. When resolving more than two temporally overlapping touches, information gained by resolving a valid x-y coordinate pair of at least one of the touches may be used to resolve the remaining touches.

Electronic device with proximity-based radio power control

Abstract: An electronic device such as a portable electronic device may have an antenna and associated wireless communications circuitry. A sensor such as a proximity sensor may be used to detect when the electronic device is in close proximity to a user's head. Control circuitry within the electronic device may be used to adjust radio-frequency signal transmit power levels. When it is determined that the electronic device is within a given distance from the user's head, the radio-frequency signal transmit power level may be reduced. When it is determined that the electronic device is not within the given distance from the user's head, proximity-based limits on the radio-frequency signal transmit power level may be removed. Data may be gathered from a touch sensor, accelerometer, ambient light sensor and other sources for use in determining how to adjust the transmit power level.

Method and apparatus for digitally equalizing a signal in a distributed antenna system

Abstract: Systems and methods for digitally equalizing a signal in a distributed antenna system are provided. In one embodiment, a signal processing device within a distributed antenna system comprises a signal path within a signal processing board, the signal path having an uncompensated distortion function of G(ω) with a system response represented by y(n); and a compensator coupled to the signal path, the compensator having a finite impulse response (FIR) filter with an impulse response function represented by H(ω), the compensator having an FIR filter parameter vector {right arrow over (h)} determined from an estimated system response y(n) of the signal path to an input comb signal x(n), wherein y(n) is estimated from interpolated measured output responses of the signal path to a plurality of frequency sweep signal test inputs.

Systems, methods, apparatus, and computer program products for enhanced active noise cancellation

Abstract: Uses of an enhanced sidetone signal in an active noise cancellation operation are disclosed.

System and method for appliance control via a personal communication or entertainment device

Abstract: A system for use in controlling operating functions of a controllable device includes a hand-held device and an intermediate device in communication with the hand-held device and the controllable device. The hand-held device is adapted to receive a gesture based input and to transmit a signal having data representative of the gesture based input. The intermediate device has programming for translating the data representative of the gesture based input in a signal received from the hand-held device into a command signal to be communicated to the controllable device wherein the command signal has a format appropriate for controlling an operating function of the controllable device that is associated with the gesture based input.

Touch controller having increased sensing sensitivity, and display driving circuit and display device and system having the touch controller

Abstract: A touch controller includes a touch data generator that is connected to a plurality of sensing lines, the touch data generator sensing a change in capacitance of a sensing unit connected to each of the sensing lines and generating touch data by processing the sensing signal corresponding to the result of sensing; and a signal processor that controls a timing of generating the touch data by receiving at least one piece of timing information for driving a display panel from a timing controller, and then providing either the timing information or a signal generated from the timing information as a control signal to the touch data generator.