10 results about "All-pass filter" patented technology

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 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.

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

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.

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.