741 results about "Waveform shaping" patented technology

A neurostimulator device for use with groups (e.g., more than four groups) of electrodes. The neurostimulator may include a stimulation assembly configured to deliver different stimulation to each of the groups. The neurostimulator may also include at least one processor configured to direct the stimulation assembly to deliver stimulation to the groups. The stimulation delivered to at least one of the groups may include one or more waveform shapes other than a square or rectangular wave shape. The processor may receive data from one or more sensors and use that data to modify the stimulation delivered. The neurostimulator may be configured to communicate with an external computing device. The neurostimulator may send data to and/or receive data and/or instructions from the computing device. The computing device may use information collected by one or more sensors to at least partially determine stimulation parameters to communicate to the neurostimulator.

The amplitude modulator comprises: an angle modulator for angle-modulating a phase signal to be inputted; a waveform shaping means in which, (1) when the magnitude of an amplitude signal to be inputted becomes smaller than a first prescribed value, a waveform of the amplitude signal is shaped so that the magnitude of the amplitude signal of the portion which becomes small becomes the first prescribed value; and/ or (2) the waveform shaping means in which, when the magnitude of the amplitude signal to be inputted becomes larger than the second prescribed value which is larger than the first prescribed value, the waveform of the amplitude signal is shaped so that the magnitude of the amplitude signal of the portion which becomes larger becomes the second prescribed value; and an amplitude modulator for amplitude modulating the signal of the output of the angle modulator by the signal of the output of the waveform shaping means.

A system for a baseband near field magnetic stripe data transmitter includes a mobile phone and a magnetic stripe transmission (MST) device. The mobile phone transmits a stream of pulses including magnetic stripe data of a payment card. The magnetic stripe transmission (MST) device includes a wave shaper, a driver and an induction device. The MST device receives the stream of pulses from the mobile phone, shapes and amplifies the received stream of pulses and generates and emits high energy magnetic pulses including the magnetic stripe data. The emitted high energy magnetic pulses are picked up remotely by a magnetic read head. The MST device shapes the stream of pulses to compensate for shielding, eddy current losses and limited inductance value of the magnetic read head.

In phased array antennas, multiple signals that perform different functions, such as radar, electronic warfare (EW) and telecommunications, can each be simultaneously transmitted only through a different sub-aperture of the array. For maximum power and efficiency, the power amplifiers operate on one signal at a time. This patent provides the technique of forming a common waveform from multiple signals for transmission through a common aperture. To practically implement this technique in wideband operations, processes performing the required waveform-shaping and amplitude-to-phase-modulation are devised that can transmit the high-power diverse waveforms without serious intermodulations and spectral distortion through every element of the array.

The present invention relates to a method for optical fiber transmission which can increase a transmission distance. A first optical fiber having dispersion is first provided. An optical signal is next supplied to the first optical fiber so that the optical signal is compressed on the time axis as propagating in the first optical fiber. In the case that the dispersion is normal dispersion, for example, prechirping is performed so that the optical signal has down-chirp. A compressed optical signal output from the first optical fiber is supplied to an optical device having a saturated gain. According to this method, the transmission distance can be increased by the effective combination of compression of the optical signal and waveform shaping by the optical device.

A system and method for the improved compression of audio signals and the restoration and enhancement of audio recordings missing high frequency content. In the preferred embodiment the different context models are applied to increase the compression ratio of spectral information, quantization coefficients and other information. Context models and arithmetic compression are used for final compression. The time-frequency amplitude envelope and degree of tonality parameters are extracted from the low frequency component. An estimate of the high frequency component is performed by applying a multiband distortion effect, waveshaping, to the low frequency content. Control of tonality is achieved by varying the number of bands within the multiband framework. A filterbank is used that roughly shapes the reconstructed high frequency component according to an estimation of the most probable shape.

A methodology for designing structured metamaterials that can reflect, absorb and focus the propagation of both scalar acoustic and vector elastic waves is described. Three exemplary representative inventions based on the disclosed invention are described, illustrating i) compact ultra-wide broadband isolation, ii) sub-wavelength gaps and negative index propagation utilizing a single material platform, and iii) a fundamentally new method of producing multiple high frequency spectral gaps. Such metamaterial designs possess a wide range of potential applications, ranging from but not limited to, isolating an entity from external mechanical or acoustical vibrations, compact focusing lenses as well as cascaded high frequency filters for wave shaping and nonlinear wave propagation control.

A system and method are provided to mitigate excitation of non-target regions of nerve fibers during spinal cord stimulation (SCS) of nervous tissue of a patient. The method and system deliver an SCS excitation waveform to an excitation electrode located proximate to a dorsal column (DC), the SCS excitation waveform shaped to excite a nerve fiber target region (TR) within the DC. The method and system also deliver a blocking waveform to a blocking electrode located proximate to the DR, the excitation waveform shaped to at least partially induce hyperpolarization into a nerve fiber non-target region (NTR) within the DR.

A network diagnostic device is provided, which comprises a passive real-time measurement tool that is useful for, among other things, expediting fault identification, isolation, and repair of a communication network or bus. The device also facilitates prediction of failures by identifying marginal operating conditions. The device analyzes data flowing through the communication network, including through an analysis of variations in bit waveform shape carried by the network physical interconnect media. In one embodiment, an implementation of the network diagnostic device is particularly useful in a DeviceNet-compatible network or, more generally, a Controller Area Network (CAN). The device identifies faults by comparing measurements made on the actual DeviceNet bus with worst-case acceptable criteria. The device interfaces with a remote monitoring computer via an Ethernet compatible medium to display parsed bit-level waveforms, network warnings and errors, as well as an overall network health index.

A high-speed pneumatic cutting system having a cutter and an actuator. The cutter is a guillotine-type, pneumatic cutter that receives a train of pressure pulses from the actuator. The actuator is designed to capture pressure pulses it receives from a pneumatic energy source in a surgical machine, such as a vitrectomy machine, or to generate its own pneumatic energy. The actuator has an accumulator coupled to the outlet of the pneumatic energy and a pressure transducer that senses the pressure level inside the accumulator. A control and display unit with a plurality of input mechanisms receives inputs from a user who selects a desired cutting rate or frequency for the cutter. The control and display unit produces an output signal based on the inputs received. The outputs from the control and display unit and the pressure transducer are sent to a waveform shaping circuit. The waveform shaping circuit produces a command signal based on the inputs that it receives. The command signal is delivered to a valve that is coupled in fluid communication to the accumulator. The valve is opened and closed according to the command signal to produce a pulse train that will operate the cutter at the selected cutting rate. The actuator may be designed as a stand-alone unit or may be integrated into a surgical machine.

PCT No. PCT/EP97/02486 Sec. 371 Date Jun. 4, 1998 Sec. 102(e) Date Jun. 4, 1998 PCT Filed May 15, 1997 PCT Pub. No. WO97/45987 PCT Pub. Date Dec. 4, 1997A communication device (60) for simultaneously transmitting independent information (82) on multiple channels comprises a modulator (66) and at least two matched filters (68-70). Each matched filter has a unique predetermined characteristic that is a time-reversed, complex conjugate of a complex waveform shape (72) produced by the modulator (66) in response to a channel encoder previously supplying known codeword vectors (75) to the modulator (66). Therefore, a composite signal envelope (82) produced for transmission by the communication device (60) of FIG. 4 has a reduced peak-to-mean envelope power ratio (PMEPR), since relatively large excursions in complex waveform shapes subsequently generated by the modulator (66) are unmatched by the unique filter characteristics while relatively small excursion are matched and therefore enhanced.

A system and method are provided for calculating power using a voltage waveform shape measurement from a contactless sensor. An electrically conductive medium carries alternating current (AC) electrical current, associated with an AC voltage, from a source node to a destination node. AC current is measured through the electrically conductive medium. Using a contactless sensor, an AC voltage waveform shape is measured. The power usage at the destination node is calculated in response to the AC current measurement, the measurement of the AC voltage waveform shape, and an AC voltage potential. For simplicity, the AC current and AC voltage waveform shape may both be measured at a first node located between the source node and the destination node. The AC voltage potential used in the power usage calculation may be an estimate, an actual measurement, or a value supplied by an external source (e.g., the power utility).

A random number generator has a simple configuration using know inexpensive electronic parts and can generate the true physical random numbers at a required generation speed. Such a random number generator can provide the true physical random numbers to any sectors of society at dramatically low cost A random pulse generator comprises a thermal noise generating element (2) having a resistor, a conductor or a semiconductor such as a diode adapted to generate thermal noises Hen no electric current is supplied to them, an analog-amplifier circuit for amplifying the irregular potential generated from the thermal noise generating element and a waveform shaping circuit (6) adapted to take out the output of the amplifier circuit as random rectangular pulse signals. A thermal noise random number generator comprises, in addition to the above components, an n-bit counter (n being an integer) for measuring the time interval between a random pulse signal output from the waveform shaping circuit (6) and the immediately succeeding random pulse signal and is adapted to output the count of the n-bit counter as natural random number.

A drive circuit (18) produces a drive signal having a waveform of a predetermined waveform shape for a device (10) having a piezoelectric actuator (14). The drive circuit (14) includes a memory (140) which stores waveform shape data which is utilized by the drive circuit in producing the drive signal. The drive circuit utilizes the waveform shape data so that, for each of plural points comprising a period of the waveform, the drive signal has an appropriate amplitude for the predetermined waveform shape. The waveform shape data has preferably been prepared to optimize one or more operational parameter(s) of the device. Preferably the waveform shape data has been prepared by solving a waveform equation, the waveform equation having coefficients determined to optimize at least one operational parameter of the device. The number of coefficients determined for the waveform equation depends on the number of harmonics of the waveform that are within a bandwidth of the device. Other aspects concerns devices which utilize the drive circuit, methods for operating devices, the memory (212) which is utilized by the drive circuit (e.g., the drive circuit which produces the drive signal for the device having the piezoelectric actuator) to store the waveform shape data, as well as apparatus and method for generating the optimized waveform shape data.

The method according to the present invention includes the steps of inputting an optical signal having a first wavelength and probe light having a second wavelength different from the first wavelength into a nonlinear optical medium, broadening the spectrum of the probe light through cross phase modulation between the optical signal and the probe light inside the nonlinear optical medium, and extracting a signal component including a modulated component of the optical signal and having a band narrower than the band of the spectrum broadened. According to the present invention it can be possible to provide a method and device which can easily convert the wavelength of signal light into an arbitrary wavelength in performing optical 3R functions.

Systems and methods for stimulation of neurological tissue apply a stimulation waveform that is derived by a developed genetic algorithm (GA), which may be coupled to a computational model of extracellular stimulation of a mammalian myelinated axon. The waveform is optimized for energy efficiency.

Apparatus and method for arbitrary qubit rotation. For example, one embodiment of a processor comprises: a decoder to decode a quantum rotation instruction specifying an arbitrary rotation value for performing a rotation of a quantum bit (qubit); a storage to store data for a plurality of waveform shapes/pulses; execution circuitry to perform the rotation of the qubit, the execution circuitry to combine a subset of the plurality of waveform shapes/pulses to approximate the arbitrary rotation value; and a classical-quantum (C-Q) interface coupled to the execution circuitry and comprising digital-to-analog circuitry to generate analog signals to rotate the qubit based on the approximation of the rotation value.

An optical signal and pump light are input to a nonlinear optical medium. In the nonlinear optical medium, the optical signal is amplified with a nonlinear effect caused by the pump light. A monitor circuit monitors parametric gain in the nonlinear optical medium. A first power controller increases input power of the optical signal so that the gain reaches saturation. A second power controller controls input power of the pump light so as to obtain a desired gain.

The invention discloses an electrocardiogram waveform classification method and device, and relates to the field of medical analysis software. The method comprises the following steps: acquiring and storing electrocardiogram data of a human body for 24 hours; performing waveform analysis on the electrocardiogram data to obtain electrocardiogram waveform corresponding to each heart beat in 24 hours; moving the electrocardiogram waveforms corresponding to the various heart beats to a preset longitudinal reference shaft, and superposing by taking the longitudinal reference shaft as a reference to form a cluster shape waveform; classifying the electrocardiogram waveforms according to the waveform shape of the cluster shape waveform to obtain different types of electrocardiogram waveforms. According to the method and the device, the electrocardiogram waveforms can be quickly and accurately classified.

A small-sized, high-functionality optical pulse compressor capable of generating a low-power, high-repetition-frequency ultrashort pulse train used for ultralast optical communication and photometry, and a simple-structure optical function generator for realizing an arbitrary time waveform. The optical pulse compressor comprises and optical Fourier transform device (F) having an optical phase modulator (9) driven by the repetition-frequency of an input optical pulse train and a dispersive medium (8), for converting the shape of an input optical pulse frequency spectrum into its time waveform, and an optical filter (3) inserted ahead of the optical Fourier transform device (F), for reducing the spectrum width of an input optical pulse, wherein the optical Fourier transform device (F) converts a small-spectrum-width optical pulse output from the optical function generator generates an optical pulse. The optical function generator generates an optical pulse having an arbitrary time waveform by reproducing, as it is, a spectrum waveform-shaped arbitrarily by an optical filter on a time-axis by tch optical Fourier transform device (F).