17 results about "Spectral shaping" patented technology

A system and method are provided for spectral shaping of light from a broadband source including multiple wavelengths. The system includes a beam splitter (BS) to receive and transmit an input beam, a dispersive element to disperse the input beam into dispersed beams separated by wavelength, and optic-elements to direct the dispersed beams onto a spatial light modulator (SLM). The SLM selectively modulates the dispersed beams reflected from the SLM, and the optic elements transmit a 0th-order of the reflected light through the dispersive element, which recombines the beams to form a reflected beam directed toward the BS. The BS separates the reflected beam from the input beam and directs it to an optical output of the system. The SLM includes multiple electrostatically deflectable reflective ribbons suspended over a reflective surface of a substrate, wherein the ribbons are separated by a distance equal to a width of the ribbons.

According to one embodiment, a method performed by an apparatus of a base station can include an operation of determining a first frequency domain of a reference signal in an extended frequency domain of frequency domain spectral shaping (FDSS) based on a quality of communication of a channel between the base station and a terminal. The method can include an operation of transmitting resource allocation information about a second frequency domain used for a data signal in the extended frequency domain to the terminal, an operation of receiving an uplink signal including the reference signal and the data signal configured based on the FDSS through the extended frequency domain, an operation of performing channel estimation for the second frequency domain through the reference signal received via the first frequency domain, and an operation of acquiring the data signal according to a result of the channel estimation for the second frequency domain.

A computer-implemented method, when executed by data processing hardware, causes the data processing hardware to perform various operations. These operations include receiving an audio signal from a sensor array at a unified post-filter, converting the audio signal to a short time Fourier transform (STFT) domain via a conversion function, determining a speech presence probability based on the converted audio signal, and determining a noise smoothing factor based on the speech presence probability. The operations further include estimating, via the unified post-filter, a noise power spectral density based on the noise smoothing factor, estimating, via the unified post-filter, a steering vector of the desired source, and generating, via the unified post-filter, a directivity-based mask and a coherence-based mask. Operations further include generating a residual echo spectrum estimate based on the directivity-based mask and the coherence-based mask, and setting one or more spectrum shaping factors based on the residual echo spectrum estimate.

Examples of the present disclosure relate to a method, device and apparatus for communication, and a computer-readable medium. An example of the method includes: conducting, based on a channel response between a transmitter and a receiver, spectral shaping on a first sequence at the transmitter, so as to obtain an intermediate sequence, where the spectral shaping at least partially counters the channel response; remapping the intermediate sequence, so as to obtain a second sequence, where the second sequence has less signal levels than the intermediate sequence; and transmitting the second sequence to the receiver, so as to train an equalizer of the receiver. In this way, the method can accelerate training of the equalizer without sacrificing performance of the equalizer or introducing any additional hardware cost.

A computer-implemented method when executed by data processing hardware causes the data processing hardware to perform operations. The operations include receiving, from a sensor array, an audio signal at a unified post-filter, converting, via a conversion function, the audio signal into a Short-Time Fourier Transform (STFT) domain, determining, based on the converted audio signal, a speech-presence probability, and determining, based on the speech-presence probability, a noise smoothing factor. The operations also include estimating, via the unified post-filter, a noise power spectral density based on the noise smoothing factor, estimating, via the unified post-filter, a steering vector of a desired source, and generating, via the unified post-filter, a directionality-based mask and a coherence-based mask. The operations further include generating, based on the directionality-based mask and the coherence-based mask, a residual echo spectrum estimation and setting one or more spectral shaping factors based on the residual echo spectrum estimation.

Embodiments are disclosed for spatial noise filling in multi-channel codecs. In an embodiment, a method of regenerating background noise ambience in a multi-channel codec by generating spatial hole filling noise comprises: computing noise estimates based on a primary downmix channel generated from an input audio signal representing a spatial audio scene with background noise ambience; computing spectral shaping filter coefficients based on the noise estimates; spectrally shaping the multi-channel noise signal using the spectral shaping filter coefficients and a noise distribution, the spectral shaping resulting in a diffused, multi-channel noise signal with uncorrelated channels; spatially shaping the diffused, uncorrelated multi-channel noise signal with uncorrelated channels based on a noise ambience of the spatial audio scene; and adding the spatially and spectrally shaped multi-channel noise to a multi-channel codec output to synthesize the background noise ambience of the spatial audio scene.

The application provides a wavelength-selective infrared emitter device controlled by ultrafast laser and voltage, which comprises a first phase change material layer, a dielectric layer, a second phase change material layer, a metal reflection layer, a silicon substrate and a conductive layer from top to bottom; by means of layered superposition design of nonvolatile phase change material and volatile phase change material, surface micro-nano structure control and optical resonant cavity control are spatially separated, so that structure reconstruction and cavity length conversion bear different spectral control tasks respectively, thereby breaking through the problem that the control freedom degree of single phase change material is limited; that is to say, the application adopts ultrafast laser to perform local phase change control on the first phase change material layer, so as to realize writing or erasing of a surface periodic grating structure, and by means of applying voltage, the second phase change material layer is subjected to phase transition, so as to adjust the equivalent optical cavity length of the Fabry-Perot cavity, and finally the spectral shaping ability and control flexibility are improved, and wavelength-selective control can be realized.

It is described a transmitter device (100) and a method for transmitting an analog signal (251, 261) via an electric cable (192). The transmitter device (100) comprises (a) a signal generation circuit (210) for generating a digital transmit signal (211) comprising a sequence of transmit symbols; (b) a filter circuit (230) for spectrally shaping the generated digital transmit signal (211, 221) and for outputting a filtered digital transmit signal (231); (c) a switching unit (240) comprising (c1) a first input terminal (242) for receiving the filtered digital transmit signal (231), (c2) a second input terminal (244) for receiving another digital transmit signal (297), (c3) an output terminal (246) for outputting a digital transmit output signal (241), wherein the digital transmit output signal (241) is based on, depending on a switching state of the switching unit (240), the filtered digital transmit signal (231) or the another digital transmit signal (297), and (c4) a control terminal (248) for receiving a control signal (285) from a control circuit (280), the control signal (285) being indicative for the switching state. The transmitter device (100) further comprises the control circuit (280); and a digital to analog converter (250) for receiving the digital transmit output signal (241) and for converting the received digital transmit output signal (241) to the analog signal (251, 261).

A computer-implemented procedure, when executed by data processing hardware, causes the data processing hardware to perform operations. These operations include receiving an audio signal from a sensor array at a unified post-filter, converting the audio signal into a short-time Fourier transform (STFT) domain using a conversion function, determining a speech presence probability based on the converted audio signal, and determining a noise smoothing factor based on the speech presence probability. The operations also include estimating a spectral noise power density based on the noise smoothing factor across the unified post-filter, estimating a control vector of a desired source across the unified post-filter, and generating a direction-based mask and a coherence-based mask across the unified post-filter.The operations also include generating a residual echo spectrum estimate based on the direction-based mask and the coherence-based mask, and setting one or more spectral shaping factors based on the residual echo spectrum estimate.

The invention relates to the technical field of seismic data processing, and discloses a signal-to-noise ratio optimization method and system for post-stack two-dimensional seismic data. The method comprises the following steps: performing well-to-seismic joint calibration on original two-dimensional seismic data to determine main target stratum distribution, and performing spectral analysis to identify a noise frequency band; based on the main target layer distribution, performing segmented Q compensation processing on the original data to obtain a seismic data volume after Q compensation processing; on the basis, spectrum shaping processing is carried out according to the identified noise frequency band so as to suppress the noise and preliminarily improve the signal-to-noise ratio; and finally, diffusion filtering processing is carried out on the data volume after spectrum shaping processing, and a final two-dimensional seismic data volume with an improved signal-to-noise ratio is obtained. According to the method, through series application of Q compensation, spectrum shaping and diffusion filtering, the continuity of the event is effectively improved, the definition of fracture imaging is improved, and a more reliable data basis is provided for structural interpretation and trap evaluation.

The application provides a metrology tool, and a method, for determining parameters of interest of a structure on an object. This metrology tool comprises: an illumination branch configured for providing an illumination beam; a spectral shaping device for spectrally shaping the illumination beam providing a spectrum comprising at least two disjunct wavelength bands; a controller and a 5 detection branch configured for detecting signals relating to a diffracted beam, the beam comprising diffracted sub-beams, wherein the signals enable determining parameters of interest. The illumination branch is further configured for illuminating the structure on the object which results in the diffracted beam. Each of the diffracted sub-beams is associated with one of the at least two disjunct wavelength bands. The controller is configured for selecting the spectrum allowing distinguishably acquiring the 0 signals from respective diffracted sub-beams and the controller is configured for controllably setting the spectral shaping device to provide the spectrum.

The invention discloses a source-sink rapid analysis method and system based on a Wheeler domain. The method comprises the following steps: acquiring an original seismic data volume; determining a target sequence interface, and based on the target sequence interface, performing Wheeler domain conversion on the original seismic data volume to obtain a Wheeler domain data volume; and performing Wheeler domain conversion on the target sequence interface to obtain the converted target sequence interface, namely the ancient micro-landform. Performing spectrum shaping on the Wheeler domain data volume by using a spectrum shaping method, and performing seismic spectrum inversion on the Wheeler domain data volume after the spectrum shaping to obtain a spectrum inversion data volume; based on the Wheeler domain data body, taking the top surface of the target sequence interface as a reference, and utilizing the bottom surface of the target sequence interface to carry out stratum horizon slice extraction on the spectrum inversion data body to obtain a spectrum inversion stratum slice; and source-sink analysis is carried out based on the ancient micro-landform and the spectral inversion stratigraphic slice. According to the invention, source-sink analysis can be rapidly and accurately carried out.

An embodiment according to the present invention includes an audio decoder configured to decode, from a data stream, a quantized spectrum, a spectral envelope representation based on linear prediction coefficients, and a fundamental frequency related parameter for a predetermined frame of successive frames. The decoder is configured to determine a spectral shaping function from a spectral envelope representation based on linear prediction coefficients using a first manner below a fundamental tone frequency determined from the fundamental frequency related parameters and a second manner above the fundamental tone frequency, to spectrally shape the quantized spectrum using the spectral shaping function to obtain a dequantized spectrum, and to decode the dequantized spectrum using the dequantized spectrum. And reconstructing the predetermined frame using the dequantized spectrum. Furthermore, the audio decoder is configured such that, if the pitch frequency is spectrally higher than a predetermined spectral position, the spectral shaping function is lower at the predetermined spectral position than if the pitch frequency is spectrally lower than the predetermined spectral position. A decoder, an encoder, and a method are also disclosed.

This invention discloses a method for estimating the envelope spectrum of ship radiated noise based on spectral whitening, belonging to the field of underwater acoustic signal processing. The method first determines the main frequency band containing the modulation characteristics of the target signal through cyclic modulation spectrum analysis; then, it processes the background noise spectrum within the main frequency band using smoothing, and calculates a spectral shaping factor based on the median of the smoothed spectrum to construct a conjugate symmetric whitening filter; finally, it performs weighted shaping of the target signal spectrum in the frequency domain, and restores the whitened spectrum to the time domain for amplitude demodulation and power spectrum analysis. This invention effectively improves the signal-to-noise ratio (SNR) of broadband envelope spectrum estimation by introducing a spectral whitening mechanism, providing a reliable guarantee for accurately extracting physical characteristics such as the number and rotational speed of ship propellers. Experiments show that this method can improve the average SNR of the envelope spectrum by approximately 7 dB, demonstrating strong engineering practical value.

Embodiments of the present disclosure relate to determination of a demodulation reference signal (DMRS) sequence. In one aspect, a terminal device receives a configuration from a network device, the configuration indicating a demodulation reference signal (DMRS) for data using lattice modulation. Based on the configuration, the terminal device determines a DMRS sequence with frequency domain spectral shaping (FDSS). The terminal device then transmits the DMRS sequence to the network device, the DMRS sequence being associated with an uplink transmission of the data using lattice modulation.

The present application provides a sensing method and apparatus. The method is applied to sensing scenarios. The method comprises: defining radio frequency metrics for frequency domain spectral shaping of a sensing service, and / or a network device indicating to a terminal device a value of an element corresponding to the frequency domain spectral shaping of the sensing service. In this way, compared with directly using radio frequency metrics for frequency domain spectral shaping of a communication service, signal processing can be carried out for frequency domain spectral shaping of the sensing service, thereby improving sensing performance.

According to an example aspect of the present invention, there is provided an apparatus configured to select a reference signal sequence, determine a number of resource blocks located outside a frequency interval via spectrally extending the signal, and when the number is an odd number, perform exactly one of the following: symmetrically extend a cyclically shifted version of the selected reference signal sequence, or asymmetrically extend the selected reference signal sequence without shifting it, map the extended reference signal sequence to resource blocks located in the frequency interval and resource blocks located outside the frequency interval, perform spectral shaping of a second signal comprising the resource blocks located both inside and outside the frequency interval, and transmit the second signal in uplink direction.