5 results about "Discrete-time signal" patented technology

A transmitter in a wireless communication network includes a bits-to-symbol mapper that produces a plurality of data symbols; and a waveform modulator that receives a first discrete-time waveform and at least a second discrete-time waveform that comprises a cyclic shift of the first discrete-time waveform; modulates a first one of the plurality of data symbols onto the first discrete-time waveform and modulates a second one of the plurality of second data symbol onto the second discrete-time waveform, to produce a plurality of modulated discrete-time waveforms; and sums the plurality of modulated discrete-time waveforms to produce a modulated discrete-time signal to be transmitted in the network. The first discrete-time waveform and at least the second discrete-time waveform are multicarrier signals.

The application provides a kind of dual-spectrum super-resolution enhanced non-contact multi-physiological parameter synchronous detection method, it is related to physiological parameter detection field, the method comprises: visible light image and thermal infrared image are collected and image processing is carried out to obtain visible light image sequence and thermal infrared image sequence;Each frame of image in visible light image sequence and thermal infrared image sequence is carried out enhancement processing, and visible light target sequence and thermal infrared image target sequence are obtained;rPPG signal and respiration signal are extracted;Signal processing is carried out to generate aligned first discrete time signal sequence and second discrete time signal sequence.The application can carry out non-contact synchronous detection to heart rate, respiratory rate and other multi-physiological parameters under strong interference conditions of illumination and motion, by image enhancement, signal extraction and signal data alignment processing, generate two groups of signal sequences with constant sampling rate and accurate alignment in time dimension, so as to accurately evaluate the physiological state of individual based on multi-physiological parameter.

A circuit and a method are provided for extracting a digitized DC voltage value representing a magnitude of a discrete-time signal received from a discrete-time system. A first full-wave rectifier performs a full-wave rectification of the discrete-time signal to obtain a full-wave rectified signal, and an oversampling analog-to-digital converter digitizes the full-wave rectified signal to obtain a bitstream. The oversampling ADC includes a second-order or higher order delta-sigma modulator and a filter. The filter is configured to filter the bitstream to extract the digitized DC voltage value.

A circuit interruption device includes a line terminal, a current sensor that measures a current flowing through the line terminal, a zero-crossing detection circuit that measures a voltage and a frequency of the line terminal, and a microcontroller. The microcontroller is configured to apply a digital filter to the line current measurement signal, determine a zero-crossing position of the line voltage measurement signal, count a plurality of turning points of the filtered line current measurement signal, determine a position of each of the plurality of turning points relative to the corresponding zero-crossing position, and determine a position of each of the plurality of turning points relative to the corresponding zero-crossing position. A time between each turning point and a subsequent turning point is determined, and based on the plurality of turning points, a position of each turning point relative to the corresponding zero-crossing position, and the time between each turning point and the subsequent turning point, it is determined whether there is an arc fault within the circuit interruption device.