138 results about "Pulse response" patented technology

The invention discloses a distribution network power line anti-interference communication method based on adaptive filtering, and belongs to the technical field of distribution network power line communication. According to the method, a communication signal adopting a frequency shift keying modulation mode is acquired from a power line coupler of a distribution network through a signal acquisition module, the communication signal is preprocessed by using a digital signal processing unit, spectral analysis is performed on the preprocessed signal, and characteristic parameters of interference noise are extracted; a coefficient vector of a finite impulse response adaptive filter is initialized based on the characteristic parameters, the order of the filter is in direct proportion to the reciprocal of the dominant interference frequency, fine adjustment is carried out based on noise energy distribution through a table look-up method or a linear mapping relation, and the weight coefficient of the filter is adjusted in real time in the communication process. The adjustment step length is dynamically adjusted according to the real-time estimated signal-to-noise ratio, and finally, the processed signal is output through the adaptive filter and data demodulation is carried out. The method is mainly used for improving the anti-interference capability and the communication reliability of the power private line communication of the distribution network.

The invention relates to the technical field of sound correction, and discloses a room sound calibration method based on listening tendency control and related equipment, which are used for improving the matching degree of a calibration result and listening preference of a user. The room sound calibration method based on listening tendency control comprises the following steps: obtaining a listening tendency parameter selected by a user through an interactive interface and a room pulse response of a current room; determining a group of frequency-related window control parameters according to the hearing tendency parameter and the room pulse response; determining a windowing strategy with the window length changing along with the frequency based on the window control parameters; windowing the room impulse response by using a windowing strategy to extract an effective frequency response curve for acoustic calibration; calculating according to the difference between the effective frequency response curve and the target frequency response curve to obtain a correction filter coefficient; and calibrating the audio signal of the audio playing system based on the correction filter coefficient.

The present invention provides a method for low-complex estimation of Direction of Arrival (DoA) and Time of Arrival (ToA) in multi-antenna-based communication comprising detecting overlapped paths between a Mobile Station (MS) and a Base Station (BS) operating under said multi-antenna-based communication with scatters present therein involving channel paths represented as Channel Impulse Response (CIR) defined with channel signatures including delay and angle steering vectors, decoupling the channel paths in delay and angle-domain and separately estimate the DoA and ToA of each path with a low computational complexity which is based on one-dimensional low-index based rotation methodology and finally pairing the DoA and the ToA.

The invention relates to the technical field of audio sound calibration, and discloses a room sound calibration method based on intermediate frequency reverberation time and related equipment, which are used for improving the accuracy of a sound calibration result. The room sound calibration method based on the intermediate frequency reverberation time comprises the following steps: acquiring a room impulse response of a target room and calculating the intermediate frequency reverberation time; according to the intermediate frequency reverberation time, the recommended window length of the frequency correlation window is determined by querying a predefined mapping relation, and the mapping relation is established based on acoustic association between the room reverberation time and the analysis window length; based on the recommended window length, determining the actual window length of the actual application in combination with the user setting mode; performing time domain windowing and frequency-related transfer function estimation processing on the room impulse response according to the actual window length to obtain window function weighted transfer function estimation; filter calibration coefficients are generated based on the transfer function estimates and applied for audio calibration.

The application discloses a wireless communication channel parameter measurement method and system, comprising the following steps: obtaining a sending signal based on a PN sequence of a wireless transmitting end; obtaining an influence of a channel impulse response based on the sending signal; performing convolution on the sending signal and the influence of the channel impulse response to obtain a receiving signal; obtaining autocorrelation outputs of different channels based on the receiving signal and the PN sequence; and obtaining path loss of the channel based on the autocorrelation outputs of the different channels. Compared with the traditional channel measurement activity using a special channel measurement instrument or a VNA, the device cost is greatly reduced, the manpower and material resources cost of the measurement activity is low, and a large amount of channel data can be obtained according to different experimental schemes.

This system for voice data processing comprises: an analog voice processing unit that receives an input of an analog voice signal and generates a digital voice signal; and a feature extraction unit that, when the digital voice signal is input, operates as an infinite impulse response (IIR) filter to filter the digital voice signal, and operate as an RNN to extract a voice feature from the filtered digital voice signal.

Systems and techniques for localization of disturbances are illustrated. One embodiment includes a method for detecting a disturbance in an area of operation, the area of operation including a plurality of transmitter-receiver pairs. The method obtains, based on a first plurality of signal transmissions between the plurality of transmitter-receiver pairs, at least one baseline channel impulse response (CIR) measurement. The method obtains, based on a second plurality of signal transmissions between the plurality of transmitter-receiver pairs, at least one additional CIR measurement; The method obtains, based on the at least one additional CIR measurement and the at least one baseline CIR measurement, at least one residual CIR measurement. The method derives, based on a sufficient similarity between the at least one residual CIR measurement and at least one particular key of a plurality of keys, localization data for at least one disturbance detected within the area of operation.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a first indication of a set of analog receive beams and an instruction to report one or more post-analog-beamformed channel impulse responses (CIRs) that are based at least in part on the set of analog receive beams. The UE may transmit a second indication of a CIR report that indicates the one or more post-analog-beamformed CIRs. Numerous other aspects are described.

Anti-interference device for satellite radionavigation signal receiver The invention relates to an anti-interference device (10, 30, 40, 50) comprising: - an analog-to-digital converter (12) configured to transform a received analog radionavigation signal into a digital signal comprising a plurality of samples;- at least one pre-cumulative filter (22) adapted to a modulation of the transmitted signal, each filter corresponding to an impulse response filter, substantially equal to a waveform of the transmitted signal, allowing for the accumulation of samples and operating at the sampling frequency of the received signal, and delivering at the output a filtered complex signal, said device further comprising at least one first amplitude processing module (24) configured to process the amplitude of said filtered complex signal, said first amplitude processing module being both downstream of said pre-cumulative filter and upstream of at least one signal demodulation channel. Figure for the abbreviation: Figure 1;

This optical fiber wireless transmission system comprises: an optical transmitter (10) that converts a wireless signal and a monitoring swept-frequency signal in a frequency band different from the frequency band of the wireless signal into an optical signal having an intensity and outputs the optical signal as transmitted signal light; an optical receiver (20) that receives the transmitted signal light from the optical transmitter (10) via an optical fiber (40); and an optical fiber deterioration monitoring device (30) that converts backscattered light of the transmitted signal light from the optical transmitter (10) caused by the optical fiber into an electrical signal, detects the monitoring swept-frequency signal as a reference signal, and performs arithmetic processing to obtain an impulse response.

The invention relates to a digital filter circuit for calculating an exponential variance of a signal, a corresponding system on chip and a method of operation. A digital signal processing method includes: applying a first infinite impulse response filtering operation to a digital input signal to produce a first filtered signal; performing a mathematical transformation on a combination of the digital input signal and the first filtered signal to produce a transformed signal; applying a second infinite impulse response filtering operation to the transformed signal to produce a second filtered signal; performing a scaling operation on the second filtered signal to generate a scaled signal; and combining the second filtered signal and the scaled signal to produce a digital output signal indicative of a statistical characteristic of the digital input signal.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a responding device may receive a signal from an initiating device. The responding device may estimate, from the signal, a channel impulse response (CIR) that represents signal reflections from one or more objects as multiple taps. The responding device may select one or more taps, from the multiple taps, that are within a first time window that starts at a first offset from a reference point and that has a first specified time duration. The responding device may transmit, to the initiating device, a CIR report that indicates the one or more taps. Numerous other aspects are described.

A noise reduction (NR) system includes a finite impulse response (FIR) filter and a filter manager circuit. The FIR filter is used to perform NR upon a filter input derived from an input signal. The filter manager circuit is used to determine a configuration of a minimum phase filter according to the input signal, and update the FIR filter by the configuration of the minimum phase filter.

The invention provides a WiFi network digital down-conversion system which comprises a multi-phase mixer and a resampling filter. The multi-phase mixer is used for converting a high-speed digital band-pass signal into a low-speed mode so as to realize digital down-conversion (DDC) on an FPGA (Field Programmable Gate Array) platform; and the resampling filter is used for reducing the sampling rate and removing unwanted frequency spectrum components to generate a complex baseband frequency spectrum. The multi-phase mixer PM of the present invention employs a parallel coordinate rotation digital computer (CORDIC) processor and a low pass filter array to reduce high speed data rates while minimizing resource utilization. The resampling filter comprises a cascade integral combination (CIC) filter and a multi-channel pulse finite impulse response (FIR) filter, optimal hardware cost is achieved, a floating point data type is converted into a fixed point data type, and resources are remarkably saved.

Embodiments of wireless communications systems, ultra-wide band (UWB) systems, and methods for wireless communications are described. In an embodiment, a wireless communications system includes a processor configured to obtain an angle of arrival (AoA) estimate from wireless signals; perform a Channel Impulse Response (CIR) analysis, and determine a confidence level for the AoA estimate based on the CIR analysis.

The embodiment of the present disclosure provides a signal processing device, a signal processing method, an electronic device and a storage medium. The signal processing device comprises: a signal processing circuit, configured to receive a first transmission parameter of an input signal associated transmission path through an input interface; perform frequency resampling on the first transmission parameter to obtain a second transmission parameter based on a predetermined frequency parameter, and determine a first frequency response of the transmission path based on the second transmission parameter; wherein the first frequency response is associated with embedded processing or de-embedded processing of the input signal; perform conjugate symmetric processing on the first frequency response to obtain a second frequency response which is a complex conjugate symmetric of the first frequency response; perform frequency domain to time domain conversion on the second frequency response to obtain an impulse response of the transmission path; determine a filter parameter of a digital filter based on the impulse response; and the digital filter is configured to process the input signal based on the filter parameter to obtain an output signal.

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may receive downlink communications using a receive beam formed using a set of antenna elements. The UE may measure a channel impulse response (CIR) for each antenna element in the set of antenna elements in a polling manner in parallel with receiving the downlink communications. The UE may generate a second receive beam or transmit beam based at least in part on the CIR of the set of antenna elements. Numerous other aspects are described.

The invention relates to a method for reducing the bias in a periodic signal having a theoretically zero mean value and provided by a sensor associated with a rotary electric machine, in particular by a sensor for determining the angular position of a rotor of a rotary electric machine, the method comprising: - receiving the signal provided by the sensor; - multiplying this signal by a signal proportional to the rotational speed of the rotor of the rotary electric machine in order to obtain a first signal; - at least one integration over half a period of the first signal in order to obtain a second signal; - applying, to the second signal, a finite impulse response filter, in particular a comb filter, so as to add, to the second signal, a delayed version of this second signal in order to obtain a third signal representative of the bias, in particular equal to the bias of the signal provided by the sensor; and - subtracting the third signal from the signal provided by the sensor, so as to reduce the bias in this signal provided by the sensor.

Embodiments of the present disclosure provide a method for suppressing channel replica caused by carrier frequency offset (CFO). The method includes: generating, by an analog-to-digital converter (ADC), a plurality of samples after receiving a sequence of chips by an antenna; accumulating, by an accumulator, the plurality of samples to generate an initial channel impulse response (CIR); comparing the CFO with a threshold value; in response to the CFO being greater than the threshold value, applying a filtering operation on the initial CIR estimate, the filtering operation configured to reduce an intensity of a sidelobe in the initial CIR estimate while maintaining an intensity of a main lobe in the initial CIR estimate; and generating a final estimated CIR based on the filtered initial CIR estimate.

The application relates to a digital spatial acoustic compensation (DRC) method comprising: establishing a wireless communication link between a digital spatial acoustic compensation system and a true wireless stereo (TWS) headphone; in response to establishing the wireless communication link, sending a start-up instruction to the true wireless stereo headphone, the start-up instruction comprising an instruction to enable one or more microphones; instructing the audio output system to output the received one or more audio test sounds; receiving one or more first digital signals, each digital signal representing one or more audio test sounds acquired in a respective audio channel; performing digital signal processing, the digital signal processing including spatial impulse response audio signal processing, thereby generating one or more time domain and / or frequency domain correction filters; and at least temporarily storing the one or more time-domain and / or frequency-domain correction filters to apply and correct an audio input signal of the audio output system prior to outputting the audible audio.

Subscriber station (10; 30; 50; 60) for a bus system (1; 2), comprising an estimating device (12) for estimating a channel impulse response (120) when and / or after only one other subscriber station (10; 20; 30; 50; 60) of the bus system (1; 2) sends a message (41; 42; 43) to the bus system (1; 2), and a correction device (13) for correcting a signal received by the subscriber station (10; 50; 60) on the basis of the channel impulse response (120) estimated by the estimating device (12), wherein the estimating device (12) is configured such that, in estimating the channel impulse response (120), it uses parameters and / or coefficients of previously received messages (41, 42, 43) identified by the message identifier (411, 421, 431) are assigned to a subscriber station which sent the received message (41, 42, 43).

An audio system and a method of providing a faded audio experience during a transition from a first audio experience to a second audio experience, is described. The first audio experience can include playback of an audio signal spatialized using a first space impulse response that is generated by the audio system. The second audio experience includes playback of the audio signal spatialized using a second space impulse response that is received by the audio system. The audio system generates a hybrid space impulse response based on the first space impulse response and the second space impulse response. During the transition between audio experiences, the hybrid space impulse response is used to spatialize the audio signal to create the faded audio experience. Other aspects are also described and claimed.

A method of operating a navigation system includes generating a spread spectrum signal, transmitting the generated spread spectrum signal as a tracking signal, receiving the tracking signal, demultiplexing and equalizing the received tracking signal, and recovering the impulse response from the demultiplexed and equalized tracking signal as a pulse, wherein a pose of a tracking device is operable to be determined by the pulse recovered from the received tracking signal.

The invention relates to a method for operating an anti-theft alarm device for a vehicle, comprising at least one sensor device (201) for monitoring a vehicle interior (301) of the vehicle (300), comprising: emitting (110) an electromagnetic output signal by means of the sensor device; receiving (120) an impulse response to the output signal by means of the sensor device, the impulse response comprising a plurality of propagation time components (LK), each propagation time component being characterized for a particular signal propagation time; comparing (130) the impulse response with a reference impulse response and determining a change (D) of the propagation time component with respect to the reference impulse response; determining (140) a change value from a change in at least a portion of the propagation time component, in particular by an accumulation of changes in at least a portion of the propagation time component; and activating (150) at least one alarm means when the change value reaches or exceeds a predefined change reference value.

The invention relates to a device for a radiofrequency communication system of a first object, the device comprising at least one transmission chain (5), the chain sequentially comprising at least: a digital modulator (7), a communication interface (9) which is designed, when in use, to communicate by radiofrequency with at least a second object which is remote from the first object, the interface sequentially comprising at least a radiofrequency transmitter (11) and a radiofrequency filter (12). Moreover, the device comprises a digital pre-correction module (8) arranged between the digital modulator (7) and the communication interface (9), the digital pre-correction module comprising at least one finite impulse response filter (13) defined on the basis of at least one characteristic of the radiofrequency filter.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive downlink communications with a receive beam that is formed using a set of antenna elements. The UE may measure, in parallel with the receiving the downlink communications, a channel impulse response (CIR) for each antenna element of the set of antenna elements in a round-robin fashion. The UE may generate a second receive beam or a transmit beam based at least in part on the CIRs for the set of antenna elements. Numerous other aspects are described.

Systems, methods, software, and devices are disclosed herein that transform a spatial input into a modal output that includes learned modal components of impulse responses. A neural network interpolates the modal components of impulse responses based on a desired sound source direction represented in the spatial input. The learned modal components are then used to determine coefficients of an infinite impulse response filter used to convert anechoic audio to spatialized audio. The spatialized audio provides a directional effect to a listener from the desired sound source direction.

A method for reducing bias in a periodic signal with a theoretically zero average value provided by a sensor associated with a rotating electrical machine, in particular by a sensor for determining the angular position of a rotating electrical machine rotor, the method comprising: - receiving the signal provided by the sensor - multiplying this signal by a signal proportional to the rotational speed of the rotating electrical machine rotor to obtain a first signal - at least one integration over half a period of the first signal to obtain a second signal - applying a finite impulse response filter to the second signal, in particular a comb filter, to add a delayed version of this second signal to obtain a third signal representative of the bias, in particular equal to the bias of the signal provided by the sensor, and - subtracting the third signal from the signal provided by the sensor.in order to reduce the bias of this signal provided by the sensor. Abbreviated figure: Fig 3,

The invention discloses a DC bus ground insulation parameter measurement method and terminal, and the method comprises the steps: injecting a composite pulse current source containing a first frequency pulse and a second frequency pulse between a DC bus and the ground, and collecting the voltage response of the DC bus corresponding to the composite pulse current source; calculating a first admittance and a second admittance corresponding to different frequencies according to the voltage response; and according to the first admittance and the second admittance, obtaining a ground Y capacitance and an insulation resistance value of the DC bus. The voltage response corresponding to the direct-current bus is obtained by injecting the composite pulse current source containing the first frequency pulse and the second frequency pulse which are different, then admittance analysis calculation is carried out according to the voltage response, the earth Y capacitance and the insulation resistance value are obtained, and the voltage response and the insulation resistance value are obtained by adopting a pulse response and admittance analysis calculation mode. And the detection time is short and is not limited by the installation position.