85 results about "Pulse burst" patented technology

Method and apparatus for providing high strength, low frequency tactile sensations using an inertial actuator in a haptic feedback interface device, such as an actuator driving an oscillating inertial mass. A commanded low frequency is modulated or combined with a higher frequency at which the tactile sensations feel stronger, where the resulting signal is used to output a tactile sensation at the higher frequency and convey the commanded low frequency to the user. One embodiment provides higher frequency pulse bursts at the desired low frequency wherein the higher frequency pulse bursts are at or near a resonant frequency of the actuator; other embodiments modulate or otherwise vary the amplitude of the higher frequency signal according to the desired low frequency.

An electrical stimulation device and method for the treatment of dysphagia is disclosed. In a preferred embodiment, the electrical stimulation device includes one or more channels of electrodes each of which includes a first electrode positioned in electrical contact with tissue of a target region of a patient and a second electrode positioned in electrical contact with tissue of a posterior neck region or a posterior thoracic region of the patient. A series of electrical pulses are then applied to the patient through the one or more channels of electrodes in accordance with a procedure for treating dysphagia. The series of electrical pulses may comprise: a plurality of cycles of a biphasic sequential pulse train pattern; a plurality of cycles of a biphasic overlapping pulse train pattern; a plurality of cycles of a triphasic sequential pulse train pattern; a plurality of cycles of a triphasic overlapping pulse train pattern; a functional pulse train pattern; a low-frequency pulse train pattern; or a frequency-sequenced pulse burst train pattern. Various exemplary embodiments of the invention are disclosed.

A pulsed electromagnetic field method of treating a soft tissue wound, wherein, in one embodiment, a patient in need of treatment for a soft tissue wound is administered a pulsed electromagnetic field (PEMF) having repetitive pulse bursts less than approximately 30 ms in duration, with a pulse burst repetition rate greater than approximately 5 Hz, the pulse bursts generated with a drive signal including pulses each having a first-polarity portion with a pulse width less than 1 ms and a second-polarity portion with a shorter pulse width, the electromagnetic field having a maximum amplitude less than approximately 4 mT and rising to its maximum amplitude during the first-polarity portion. According to another aspect of the invention, a soft tissue wound is treated by administering a pulsed electromagnetic field having substantially unipolar magnetic field pulses generated with a drive signal including a series of pulses each having a first-polarity portion with a pulse width less than 1 ms and a second-polarity portion with a longer pulse width, the electromagnetic field having a maximum amplitude less than 4 mT and rising to its maximum amplitude during the first-polarity portion.

Output pulses from an optical system having a seed source and an optical amplifier coupled to the seed source may be controlled by controlling a power of a seed signal from the seed source. The seed signal may be varied between a minimum value and a maximum value in a way that the seed signal exhibits one or more pulse bursts. Each pulse burst may contain one or more pulses. During an inter-pulse period between successive pulses within a pulse burst or between successive pulse bursts, the power of the seed signal may be adjusted to an intermediate value that is greater than the minimum value and less than the maximum value. The intermediate value is chosen to control a gain in the optical amplifier such that a pulse or pulse burst that follows the period exhibits a desired behavior.

A method for stimulating nerve or tissue fibers and a prosthetic hearing device implanting same. The method comprises: generating a stimulation signal comprising a plurality of pulse bursts each comprising a plurality of pulses; and distributing said plurality of pulse bursts across one or more electrodes each operatively coupled to nerve or tissue fibers such that each of said plurality of pulse bursts delivers a charge to said nerve or tissue fibers to cause dispersed firing in said nerve or tissue fibers.

A method and system for bladder control are disclosed. In embodiments, a method for bladder control is provided that comprises coupling an electrode to an afferent nerve that is related to the bladder. Applying a plurality of pulse burst stimulations via the electrode causes voiding of urine from the bladder. In embodiments, the plurality of pulse burst stimulations to the afferent nerve reduces external urethral sphincter (EUS) contractions and evokes bladder contractions to expel urine from the subject. In embodiments, the plurality of pulse burst stimulations to the afferent nerve evokes bladder contractions alone to expel urine from the subject. In embodiments, a system for bladder control is provided that comprises an electrode for applying a pulse burst stimulus to an afferent nerve or dermatome to reduce reflex contractions and a signal generator for generating the pulse burst stimulus.

A resonant switching power converter having burst mode transitioning operates during low or zero load conditions with reduced audible noise and component stresses, while improving efficiency. Pulse bursts are generated with a beginning and / or ending pulse duration that differs from mid-burst pulse durations, in order to reduce an amplitude of transients otherwise generated at the beginning and / or end of the bursts. Alternatively, the spacing between the pulses at the beginning and / or end of the bursts may differ from the spacing between the pulses in the middle of the bursts to reduce the transient(s). A number of pulses at the beginning and / or end of the burst can also be set with gradually varying durations, to further reduce component stress and audible vibration in a transformer that couples the resonant tank to the output of the converter.

A circuit assembly controlling an optical system to generate optical pulses is provided. The optical system includes a seed light source optically coupled to an amplitude modulator. The circuit assembly includes a control circuit which generates a pulsed seed drive signal for driving the seed laser source, as well as logic signals defining successions of ON and OFF states and having a predetermined relative timing relationship. One or more of the logic signals is delayed by a corresponding programmable delay line to adjust the relative timing relationship between the logic signals. A logic gating module combines the logic signals according to one or more logical rule, thereby providing a modulator drive signal. Using this circuit assembly, the optical system outputs an optical pulse at each ON state of the modulator drive signal synchronized with the passage of one of the seed optical pulses through the amplitude modulator.

In a mobile environment, a mobile device includes an attached memory stick (removable memory) having a high speed—memory and storage with direct memory access embodied in an integrated circuit chip coupled to an ultra-wideband (UWB) transceiver. The mobile device communicates with other like base devices, portable or stationary, via UWB transmissions using pulse bursts up to 1 Gbit per second. Data transfers between the devices occur in the simplex or duplex mode, after a low power communication connection is established between the devices. The communication link between the devices is in the range of 10-20 meters. The communication system allows existing device bus interfaces (which are much slower than ultra-wideband transmissions) to communicate between the fast read / write cycles of the memories integrated within the memory stick. Duplex transmission can occur by pulse interleaving sending side transmitters and receiving side transmitters.

A device operable as an electronic shark deterrent has a high-voltage pulse signal waveform generator for pulses to be applied to electrodes immersed in water to deter sharks and other aquatic creatures. A preferred output waveform has a train of pulse bursts of alternating-polarity pulses in a series. Preferably, the timing intervals between pulses are of irregular duration, the amplitudes of pulses are varied to be irregular, and the interval between pulse bursts is kept to less than about 5 seconds, in order to be more effective as a shark deterrent signal. The device has the signal waveform generator enclosed in a thin, planar case mounted to a belt connector and a fastener strap for attachment to a part of a user's body. It can include a water-detection probe for automatic activation when immersed in water, a status LED indicator, and electrodes embedded in a layer at opposite ends of the fastener strap with an insulative screen layer for reducing electrostatic effects on the user.

Compositions and methods are provided for modulating the growth, development and repair of bone, cartilage or other connective tissue. Devices and stimulus waveforms are provided to differentially modulate the behavior of osteoblasts, chondrocytes and other connective tissue cells to promote proliferation, differentiation, matrix formation or mineralization for in vitro or in vivo applications. Continuous-mode and pulse-burst-mode stimulation of cells with charge-balanced signals may be used. Bone, cartilage and other connective tissue growth is stimulated in part by nitric oxide release through electrical stimulation and may be modulated through co-administration of NO donors and NO synthase inhibitors. Bone, cartilage and other connective tissue growth is stimulated in part by release of BMP-2 and BMP-7 in response to electrical stimulation to promote differentiation of cells. The methods and devices described are useful in promoting repair of bone fractures, cartilage and connective tissue repair as well as for engineering tissue for transplantation.

Output pulses from an optical system having a seed source and an optical amplifier coupled to the seed source may be controlled by controlling a power of a seed signal from the seed source. The seed signal may be varied between a minimum value and a maximum value in a way that the seed signal exhibits one or more pulse bursts. Each pulse burst may contain one or more pulses. During an inter-pulse period between successive pulses within a pulse burst or between successive pulse bursts, the power of the seed signal may be adjusted to an intermediate value that is greater than the minimum value and less than the maximum value. The intermediate value is chosen to control a gain in the optical amplifier such that a pulse or pulse burst that follows the period exhibits a desired behavior.

A hysteretic DC / DC converter is proposed that operates at a high switching frequency without producing undesired pulse bursts at the output. The converter has a converter power stage with a supply voltage input, a controlled voltage output and an enable input. A comparator has a reference voltage input, a feedback input and an output, and a gating circuit connected between the output of the comparator and the enabling input of the converter power stage. The gating circuit inhibits as a function of load requirements the propagation of enabling pulses from the output of the comparator to the enabling input of the converter power stage. By gating the output of the comparator in a way to separate the output from the enabling input of the converter power stage immediately after the start of each conversion pulse, the generation of further pulses immediately after each conversion pulse is prevented, thereby keeping the output voltage ripple low.

A LiDAR system includes a signal generator for generating an output signal having a variable frequency. A modulation circuit receives the output signal from the signal generator and modulates the output signal to generate a pulsed modulation envelope signal configured to comprise a plurality of pulses, two or more of the plurality of pulses having two or more respective different frequencies. The modulation circuit applies the pulsed modulation envelope signal to an optical signal to generate a pulse-envelope-modulated optical signal comprising a plurality of pulses modulated by the pulsed modulation envelope signal. Optical transmission elements transmit the pulse-envelope-modulated optical signal into a region. Optical receiving elements receive reflected optical signals from the region. Receive signal processing circuitry receives the reflected optical signals and uses quadrature detection to process the reflected optical signals.

Pulse width modulation is provided for controlling a resonant power converter, particularly for dimming of light emitting diode arrays without loss of efficiency. Dynamic oscillation due to the beginning of a pulse width modulated pulse burst is limited by shortening of the first and / or last pulse of a pulse bust such that the first pulse of a subsequent pulse burst close to or to connect with a full load steady-state voltage / current trajectory of the power converter. Pulse shortening made be made substantially exact to virtually eliminate dynamic oscillation but substantial reduction in dynamic oscillation is provided if inexact or even performed randomly.

A circuit assembly controlling an optical system to generate optical pulses is provided. The optical system includes a seed light source optically coupled to an amplitude modulator. The circuit assembly includes a control circuit which generates a pulsed seed drive signal for driving the seed laser source, as well as logic signals defining successions of ON and OFF states and having a predetermined relative timing relationship. One or more of the logic signals is delayed by a corresponding programmable delay line to adjust the relative timing relationship between the logic signals. A logic gating module combines the logic signals according to one or more logical rule, thereby providing a modulator drive signal. Using this circuit assembly, the optical system outputs an optical pulse at each ON state of the modulator drive signal synchronized with the passage of one of the seed optical pulses through the amplitude modulator.