18 results about "All-pass filter" patented technology

The invention relates to the technical field of three-phase systems, and provides a three-phase voltage state estimation method and system based on virtual coordinates, and the method comprises the steps: calculating the voltage peak value of each phase for three-phase voltages, and determining that a phase is open if the peak voltage of a certain phase is lower than a threshold value in the three peak voltages; for three-phase voltage, virtual beta-axis voltage is generated through an all-pass filter, actual beta-axis voltage is obtained through Clark transformation, the product of the virtual beta-axis voltage and the actual beta-axis voltage serves as an evaluation function, and a positive sequence and a negative sequence are distinguished according to the positive and negative of the evaluation function. The system state can be accurately and effectively judged under the conditions of three-phase imbalance and voltage distortion, the anti-noise capability and the anti-harmonic interference capability are high, and safe and stable operation of equipment under the abnormal condition is ensured.

The application discloses a sound source orientation method and device based on an all-pass filter, equipment and a medium, and relates to the technical field of computers. The method comprises the following steps: recording a sound source based on a linear microphone array to obtain multi-channel recording data, performing first generalized cross-correlation operation on a wideband excitation signal and the multi-channel recording data, performing slicing and second generalized cross-correlation operation on the obtained first cross-correlation result, determining an initial delay value by using a quadratic function fitting method, and judging whether the absolute value of the initial delay value is greater than a preset threshold. If yes, the multi-channel sliced data is up-sampled, the signal delay relationship of each adjacent channel is modeled by using a Thiran all-pass filter, the target delay value of each adjacent channel is determined based on the obtained linear equation and by using a least square method, and the sound source incidence angle is determined by using the target parameters of the linear microphone array. The method breaks through the constraint of the Rayleigh limit and performs high-precision delay estimation, so that the accuracy of sound source orientation is ensured.

The application discloses a low-power consumption full-differential multiple harmonic IQ zero intermediate frequency mixing circuit, which comprises a quadrature all-pass filter QAF, a phase-shifting driver based on current vector synthesis, an mth harmonic frequency mixer I_MIXER based on a frequency multiplication structure and an mth harmonic frequency mixer Q_MIXER based on a frequency multiplication structure. The input local oscillator differential signal is changed into a quadrature IQ differential signal through the quadrature all-pass filter, then the driver module is used to realize the amplification signal and phase-shifting functions, generate and amplify the differential signal with the required phase, and then the differential signal is injected into the IQ mixer, and the mixer is used to realize the frequency multiplication function through the circuit structure based on the frequency multiplier and the state class B bias state of the adjusting transistor, so that the local oscillator signal is multiplied and mixed with the input RF signal. The application saves the power consumption of the frequency multiplier, effectively reduces the power consumption of the local oscillator signal link, and optimizes the linearity and noise of the mixer.

An electronic device may include a microphone that receives a first acoustic sound and generates a first audio signal based on the first acoustic sound. The electronic device may also include filter circuitry having multiple filter stages, each filter stage including an all-pass filter and a multiplier where respective outputs of each of the filter stages are summed in series. Moreover, the filter circuitry may determine a filter input based on the first audio signal and process the filter input via the filter stages to generate a second audio signal. The electronic device may also include a speaker to output a second acoustic sound based on the second audio signal.

An apparatus is provided according to an embodiment for processing a first audio signal to generate two or more second audio signals. The apparatus includes a decorrelation module (110) configured to generate two or more processed signals from the first audio signal. The decorrelation module (110) is configured to generate each of the two or more processed signals by transforming the first audio signal to the frequency domain to obtain a transformed audio signal, by applying a delay, by applying a full-pass filter to the transformed audio signal, by performing envelope shaping, and by performing an inverse transform to obtain the processed signal. Furthermore, the apparatus includes a mixer (120) configured to generate each of the two or more second audio signals by mixing at least two of the two or more processed signals. The decorrelation module (110) is configured to apply the full-pass filter using different filter coefficients to generate each of the two or more processed signals. The mixer (120) is configured to mix in different ways to generate each of the two or more second audio signals.

An electronic device may include a microphone that receives a first acoustic sound and generates a first audio signal based on the first acoustic sound. The electronic device may also include filter circuitry having multiple filter stages, each filter stage including an all-pass filter and a multiplier where respective outputs of each of the filter stages are summed in series. Moreover, the filter circuitry may determine a filter input based on the first audio signal and process the filter input via the filter stages to generate a second audio signal. The electronic device may also include a speaker to output a second acoustic sound based on the second audio signal.

A Coriolis flow meter includes a sensor system generating a first sensor signal and a second sensor signal. A measuring or operating circuit includes a microprocessor designed to operate an excitation system. An all-pass filter having a filter coefficient and which is designed to receive the first sensor signal and to generate a filtered first sensor signal is provided. The measuring or operating circuit receives the filtered first sensor signal and the second sensor signal, and has a control circuit designed to control the filter coefficient, based on the filtered first sensor signal and the second sensor signal, or based on a variable derived from the filtered first sensor signal and the second sensor signal, such that a control criterion is satisfied, and a first measurement value representing the process variable from the filter coefficient is generated.

A musical tone signal generation apparatus, method, and storage medium that utilizes an all-pass filter for efficient processing. The method involves setting a first delay unit that generates a delay corresponding to a specified pitch, setting its pre-stage delay unit as a 0th delay unit, and its post-stage delay unit as a 2nd delay unit. At least three fractional delay blocks are connected to the first, 0th, and 2nd delay units, respectively. In a scenario where, based on a change in the specified pitch, one of the 0th and 2nd delay units is set as a new first delay unit, and the pre-stage delay unit of the new first delay unit is set as a new 0th delay unit, and the post-stage delay unit of the new first delay unit is set as a new 2nd delay unit, one of the 0th and 2nd delay units continues to be connected to the fractional delay blocks, and at least one of the new 0th and new 2nd delay units is then changed to be connected to at least one of the fractional delay blocks other than the fractional delay block connected to the new first delay unit.

Simulated audio signals in a virtual environment are decorrelated by obtaining (102) a first set of decorrelation filters (eg. frequency-selective phase shifting all-pass filters as in Fig. 3), evalua

The invention provides a dual-channel time-interleaved ADC mismatch correction method and system, and a storage medium. The method comprises the following steps: S1, splitting an output signal of a dual-channel time-interleaved ADC into two independent channel signal sequences; s2, determining a unified direct current value based on the deviation between the average value of each channel signal sequence and the ADC quantization coding center value; s3, respectively calculating signal amplitude values of the two channels to determine a gain ratio, and correcting mismatching of the gains of the two channels according to the gain ratio; s4, converting the error between the actual phase difference of the two channels and the ideal phase difference into Delta sampling periods so as to establish an all-pass filter to perform time sequence correction on a non-reference channel; and S5, combining the corrected signal sequences of the two channels, and superposing a unified direct current value. Therefore, the problem that spurious interference occurs in an output spectrum due to mismatching of imbalance, mismatching of gain and mismatching of time sequence of the dual-channel time-interleaved ADC is solved.

This invention discloses an APF control method with frequency adaptation under grid voltage imbalance. The inner loop (voltage loop) uses PI control to stabilize the DC bus voltage, achieving stable energy exchange between the two sides of the converter. The outer loop (current loop) employs a composite control algorithm combining proportional-integral (PI), proportional-complex-integral (PCI), and proportional-resonant (PR) control to achieve precise control of the compensation current. When the grid voltage is balanced, only PI plus PCI control is used, resulting in a large stability margin and fast dynamic response. When the grid voltage is unbalanced, a full-pass filter separates the reference signal into positive and negative sequences. The positive sequence component still uses PI plus PCI control, while the negative sequence component uses PI plus PR control, addressing the poor stability of single PCI control under grid voltage imbalance. A frequency-locked loop is introduced into the system to track and control the grid frequency in real time, improving current control accuracy and simplifying the computational complexity of the control algorithm. This method is applicable to other three-phase inverter control systems.

The invention provides a positive and negative sequence electric quantity separation method and device. The method comprises the steps of obtaining an instantaneous electric quantity signal in a three-phase power grid; performing phase angle deviation of a preset angle on the instantaneous electric quantity signal based on an all-pass filter to obtain an instantaneous orthogonal electric quantity signal; and determining a positive sequence component and a negative sequence component of the instantaneous electric quantity signal according to the instantaneous electric quantity signal and the instantaneous orthogonal electric quantity signal. The phase angle deviation of the preset angle is performed on the instantaneous electric quantity signal based on the all-pass filter so as to acquire the instantaneous orthogonal electric quantity signal, and the phase angle deviation can be realized with extremely high precision by utilizing the characteristic that the all-pass filter keeps the amplitude response constant in the whole frequency range and only changes the phase of the signal, so that the error caused by the amplitude change is avoided. According to the method, the instantaneous orthogonal electric quantity signal is obtained firstly, then the positive sequence component and the negative sequence component are determined in combination with the instantaneous electric quantity signal, the positive sequence component and the negative sequence component are rapidly obtained in a three-phase power grid system with the high real-time performance requirement by means of the orthogonal relation between the signals, and error analysis is facilitated.

The embodiment of the invention provides a signal separation system, method and device, a storage medium and a program product, and relates to the technical field of signal processing. The system comprises a feature extraction module used for obtaining an AC voltage signal having the same frequency as a hybrid signal fundamental frequency, converting the AC voltage signal into a DC reference voltage, and amplifying the DC reference voltage based on a target frequency to obtain a feature delay voltage corresponding to the target frequency; the physical field regulation and control module is used for acquiring the characteristic delay voltage and driving a voltage-controlled element to generate a physical field with continuously changing intensity through the characteristic delay voltage, so that passive element parameters of the first-order all-pass filter continuously change along with the intensity of the physical field to generate a delay signal matched with a target frequency; and the signal separation and recovery module is used for separating a target frequency component from the mixed signal according to the delay signal. The system is used for achieving the effect of continuously and flexibly realizing signal separation of different target frequencies.

Systems, devices, and methods are described for determining a "coupled" pair of left / right ear HRTFs adapted from the original pair of left / right ear HRTFs. The interaural delay of the coupled HRTF is formed using a whole-pass filter that provides the correct interaural delay at low frequencies. The whole-pass filter is adapted to limit the interaural phase difference at high frequencies. Furthermore, a low-complexity process for the rapid generation of a suitable whole-pass filter is described.

The invention discloses a power grid positive and negative sequence phase locking method based on an all-pass filter and orthogonal characteristics, and the method comprises the steps: firstly converting a three-phase power grid voltage into alpha and beta coordinate system components through Clark transformation, carrying out the 90-degree phase delay processing of the alpha and beta components through an all-pass filter, and separating the positive and negative sequence alpha and beta components of a power grid; then, an orthogonal discrete reference signal is generated, a multiplication integral result of the positive and negative sequence alpha components and the reference signal is updated through sliding window integration, amplitudes and phase correlation trigonometric function values of the positive and negative sequence alpha components are calculated based on the integral result, and finally, real-time phase angles of the positive and negative sequence components are determined through an arcsine function. And independent locking of positive and negative sequence phases is realized. A PI regulator and a loop filter in a traditional phase-locked loop are omitted, the phase is extracted through a direct calculation method, and the method has the advantages of being simple in structure, rapid in dynamic response, high in harmonic interference resistance and high in calculation efficiency.

A method of confining a nanoobject and a nanoobject trap for an optically levitated elongated nanoobject are disclosed. The nanoobject has an aspect ratio greater than two and said nanoobject trap comprises: a chamber for containing said nanoobject; means for generating a harmonic potential for confining said nanoobject in said nanoobject trap; and a feedback signal generator. The feedback signal generator comprises an optical detector for detecting oscillation of said nanoobject, said feedback signal generator being configured to generate a feedback signal in dependence upon said detected oscillation; and an all-pass filter for generating a phase change of in said feedback signal such that said feedback signal is substantially ninety degrees out of phase with a first harmonic of said detected oscillation. A modifier modifies said harmonic potential in dependence upon said feedback signal.