607 results about "Continuous signal" patented technology

The present invention relates to a merging network for multiple data streams comprising a pipelined butterfly network. The pipelined butterfly network comprises an input network for receiving a plurality of data streams of mutually constant widths, each data stream having logically related data bits carried on contiguous signal lines, a butterfly network containing suitably interconnected register and multiplexer means for rearranging the received data streams into a time-multiplexed constant-width output data stream, the output data stream having a width equal to or greater than the sum of the widths of the input data streams, and an output network for providing the output data stream interleaved to an output bus.

A method and apparatus for performing measurement by a User Equipment (UE) in a mobile communication system are provided. The UE has a Discontinuous Reception (DRX) mode for discontinuously receiving data and a continuous reception mode for continuously receiving data. The mobile communication system also has a serving cell where the UE is located, and a neighboring cell located near the serving cell. Signal strength of the serving cell is measured according to a period of the DRX mode. The signal strength measurement is continuously performed on the serving cell and the neighboring cell, if the measured signal strength of the serving cell is less than or equal to a particular threshold. The continuous signal strength measurement is stopped and signal strength of the serving cell is measured according to the period of the DRX mode, if the continuously measured signal strength of the serving cell is greater than the particular threshold.

The invention discloses a vehicle-mounted millimeter-wave radar moving target recognizer. The vehicle-mounted millimeter-wave radar moving target recognizer is characterized in that the recognizer is a frequency synthesizer; a frequency agility continuous signal is modulated into a pulse signal and then is processed into a millimeter-wave signal by up-conversion; after being amplified by a power amplifier, the millimeter-wave signal is transmitted out; an antenna receives a radar echo signal back to a circulator and then the signal is transmitted into a frequency mixer; a high-frequency echo pulse and constant-amplitude high-frequency voltage generated by a high-stability local oscillator are mixed and the signal is reduced to a middle frequency and then is processed by a middle-frequency amplifier; the middle-frequency signal is directly sampled by an A/D (Analogue/Digital) conversion module; after being sampled, echo signals of a whole pulse string are stored into a storage unit; and information of targets, such as quantity, speed and direction, is measured by a signal processing unit and then is transmitted to an alarm executing unit. With the adoption of the structure, the vehicle-mounted millimeter-wave radar moving target recognizer has the advantages that 1 the distance measuring precision and the angle measuring precision of a moving target are improved; and 2 excessive hardware does not need to be added and the production cost is lower.

A method and apparatus for controlling a brushless DC (BLDC) motor over a wide range of angular speeds is presented. Analog magnetic sensors provide continuous signal measurements related to the rotor angular position at a sample rate independent of rotor angular speed. In one embodiment, analog signal measurements are subsequently processed using an arctangent function to obtain the rotor angular position. The arctangent may be computed using arithmetic computation, a small angle approximation, a polynomial evaluation approach, a table lookup approach, or a combination of various methods. In one embodiment, the BLDC rotor is used to drive a Roots blower used as a compressor in a portable mechanical ventilator system.

A method performed by one or more computing devices. The method includes identifying first and second portions of a digital video signal. First and second values of a plurality of quality metrics are determined for the first and second portions, respectively. The first and second values of the metrics are used to determine first and second values, respectively, of a plurality of picture quality parameters such that a signal transmitted using either the first or second values of the parameters would require at most a maximum output bitrate. The first values of the parameters may differ from the second values of the parameters. The first and second portions are adjusted using the first and second values, respectively, of the parameters. The first and second adjusted portions are transmitted in a continuous signal. Optionally, the first and second adjusted portions are compressed before they are transmitted.

A method and apparatus for enhancing the moveout between a direct wave and a reflected wave. The method involves transmitting imaging signals into a body to be imaged and receiving the resulting signals propagated from the signal source. The step of receiving the propagated signals includes selectively adjusting the distance between the signal source and the signal receivers between successive signals. The method further comprises separating the reflected signals from the total received signals and enhanced stacking of the measured reflected signals.

A method for reducing the peak-to-average ratio in an OFDM communication signal is provided. The method includes defining a constellation having a plurality of symbols, defining a symbol duration for the OFDM communication signal, and defining a plurality of time instants in the symbol duration. A plurality of tones are allocated to a particular communication device, and a discrete signal is constructed in the time domain by mapping symbols from the constellation to the time instants. A continuous signal is generated by applying an interpolation function to the discrete signal such that the continuous signal only includes sinusoids having frequencies which are equal to the allocated tones.

The invention discloses a harmonic analysis method based on Kaiser self-convolution window dual-spectrum line interpolation FFT (Fast Fourier Transform) and a device thereof. The method comprises the following steps of sampling a signal: sampling a time-domain continuous signal, and discretizing to obtain an infinitely long discrete sequence; windowing a four-order Kaiser self-convolution window function: performing four-order Kaiser self-convolution window operation on the infinitely long discrete sequence; performing N-point FFT on a windowed and truncated signal to obtain the discrete spectrum of the signal; determining the peak parameter of the discrete spectrum: searching the local spectrum peak of each integer harmonic frequency around the integer harmonic frequency; and calculating a harmonic parameter: solving a coefficient alpha by adopting a discrete spectrum interpolation correction formula based on an LSM (Least Square Method), and calculating parameters such as a harmonic frequency, an amplitude, an initial phase angle and the like. Due to the adoption of the method, the fundamental and harmonic components of a tested signal can be detected rapidly and accurately, and accurate frequency measurement is realized; and the method is convenient for implementing an embedded system, and the tested signal can be detected continuously for a long time.

A filter monitoring system employs a differential pressure sensor to provide a continuous signal output proportional to a pressure drop across a filter element. The differential pressure sensor communicates with a controller that provides output signals to indicate that the filter requires replacement and provides advanced warning for when the filter element will reach a predicted filter differential pressure limit value.

A method for reducing the peak-to-average ratio in an OFDM communication signal is provided. The method includes defining a constellation having a plurality of symbols, defining a symbol duration for the OFDM communication signal, and defining a plurality of time instants in the symbol duration. A plurality of tones are allocated to a particular communication device, and a discrete signal is constructed in the time domain by mapping symbols from the constellation to the time instants. A continuous signal is generated by applying an interpolation function to the discrete signal such that the continuous signal only includes sinusoids having frequencies which are equal to the allocated tones.

An RF electronic identification system 10 is disclosed and claimed. The system includes a reader 12 and a plurality of transponders 14.1 to 14.n. When energized by an interrogation signal from the reader, each transponder automatically responds by repeatedly retransmitting a signal burst including identification code data associated with the relevant transponder. Each transponder includes circuitry 34 for generating random inter-transmission intervals for separating any two consecutive signal bursts and a controller 42 for the generation circuitry, to cause an average value of the inter-transmission intervals over a period of time to vary, preferably to increase. This feature enhances the probability and speed of reading a transponder population of almost any size.

A process for enhancing ambience in an audio signal output that is derived from an audio signal input in a dual channel audio ambience extraction circuit. The process includes cross-coupling of audio signals in one channel with audio signals in another channel. Each of the cross-coupled signals is attenuated and delayed by an adjustable time period that is within a haas delay time and is then applied in the feedback path to a summing input of an opposite channel. At the summing input, the signals are mixed with subsequent audio signal inputs to that channel. All of the attenuated and delayed signals are continuously applied to outputs of the extraction circuit during the cross-coupling process. The output signals comprise the original signals plus delayed and attenuated reproductions of the original signal along with continuing signals that are submitted to the extraction circuit subsequent to the initial signals.

A timing calibration system for a wafer level integrated circuit (IC) tester is disclosed. The tester includes a set of probes for contacting pads on a surface of an IC and having a plurality of tester channels. Each channel generates a TEST signal at a tip of a corresponding probe in response to a periodic CLOCK signal with a delay adjusted by drive calibration data supplied as input to the tester channel. The TEST signal produced by each channel includes edges occurring in a timing pattern controlled by programming data provided as input to each tester channel. To calibrate test signal timing of all channels, each channel is programmed to generate a test signal having the same repetitive edge timing pattern at the tester channel's corresponding probe tip. The test signal produced at each probe tip is then cross-correlated to a periodic reference signal having the same repetitive edge timing pattern. The drive calibration data of each channel is then iteratively adjusted to determine a value which maximizes the cross-correlation between its output test signal and the reference signal. To maximize the accuracy of the timing calibration, each repetition of the test and reference signal edge pattern provides pseudo-randomly distributed time intervals between successive signal edges.

A system and method for data communication over a cellular communications network that allows the transmission of digital data over a voice channel using a vocoder that operates in different modes depending upon characteristics of the inputted signal it receives. To prepare the digital data for transmission, one or more carrier signals are encoded with the digital data using one of a number of modulation schemes that utilize differential phase shift keying to give the modulated carrier signal certain periodicity and energy characteristics that allow it to be transmitted by the vocoder at full rate. The modulation schemes include DPSK using either a single or multiple frequency carriers, combined FSK-DPSK modulation, combined ASK-DPSK, PSK with a phase tracker in the demodulator, as well as continuous signal modulation (ASK or FSK) with inserted discontinuities that can be independent of the digital data.

The invention relates to a method of qualitatively evaluating a digital audio signal. It calculates a quality indicator consisting of a vector associated with each time window in real time, in continuous time, and in successive time windows. For example, the generation of a quality indicator vector calculates, for a reference audio signal and for an audio signal to be evaluated, the spectral power density of the audio signal, the coefficients of a prediction filter, using an autoregressive method, a temporal activity of the signal or the minimum value of the spectrum in successive blocks of the signal. To evaluate the deterioration of the audio signal, the method may calculate a distance between the vectors of the reference audio signal and the audio signal to be evaluated associated with each time window.

The invention provides a distributed stimulated Brillouin temperature strain sensing system based on double-sideband modulation, which includes a narrow linewidth light source, a power divider, a microwave source, a pulse signal emitter, an optical receiver, an optical amplifier, an electrooptical modulator and a sensing optical fiber, wherein a pulse optical signal and a continuous signal that is modulated by double-sideband are input into the two ends of the sensing optical fiber respectively; the pulse optical signal serves as a pumping optical signal; the double-sideband continuous optical signal serves as a detecting optical signal; the pumping optical and detecting optical signals encounter to produce the stimulated Brillouin; and the continuous light carries the temperature or strain information of the points distributed along the sensing optical fiber. The double-sideband technology can effectively controls the Brillouin consumption of the pumping pulse during transmission, and greatly reduces the system error in measurement. The distributed stimulated Brillouin temperature strain sensing system is applicable to the fields as transmission cable and oil-gas pipeline monitoring and fire control, and is particularly applicable to sensing of long distance more than 50km.

The invention relates to a universal data acquisition unit and a data acquisition method thereof, belonging to the technical field of data acquisition; the universal data acquisition unit comprises amicroprocessor; a multi-path discrete signal input interface is connected with the input end of a counter by a photoelectric isolating circuit, and a multi-path continuous signal input interface is connected with the input end of an A/D converter, and a microprocessor is connected with the input ends of the A/D converter and the counter. The data acquisition method comprises that: system initialization is carried out; continuous and discrete signal interrupt vector is set; interrupt latency is carried out, if the discrete signal is interrupted, the discrete signal is acquired; if the continuous signal is interrupted, the continuous signal is acquired; if a watchdog is interrupted, a system is restarted; if hibernation is interrupted, system setting data is stored, and then a hibernation state is carried out; and then, interrupt latency awaken operation is carried out, if awakening is interrupted, the system is started, and the setting is restored before interruption; if the continuoussignal and the discrete signal are acquired, interrupt latency is continuously carried out after data is transmitted to an upper computer; if not, interrupt latency is carried out directly.

An electromagnetic antenna apparatus exhibits a generally continuous signal response between a first frequency and a second frequency, and further exhibits a deviation from the signal response in a frequency region centered substantially at a selected frequency between the first frequency and the second frequency. The apparatus includes: (a) an antenna transceiving element; (b) a feed structure coupled with the antenna receiving element for communicating transceiving signals with the antenna transceiving element; and (c) a discontinuity structure in the antenna transceiving element coupled with the feed structure. The discontinuity structure is configured for effecting return of selected transceiving signals to the feed structure as return signals. The return signals effect the deviation.