10results about How to "Increased frequency range" patented technology

The application discloses a kind of acquisition methods for the acoustic transfer characteristics of a through-hull piping system, which comprises the following steps: obtaining the acoustic transfer characteristics of the piping system in the frequency range of 5Hz-1st critical frequency, drawing the relationship curve, and taking the 1st peak point on the curve; determining each high-order critical frequency, calculating and obtaining the relationship between the amplitude A of the peak point in the acoustic transfer characteristics relationship curve of the piping system and the frequency f; drawing the relationship curve between the amplitude of the peak point and the frequency, and determining the peak point of each frequency band on the curve, and calculating the acoustic transfer characteristics relationship of the corresponding peak point frequency band. The beneficial effects of the present application are: based on the traditional method, the peak point-frequency relationship of the acoustic transfer characteristics curve of the through-hull piping system is given, and an acquisition method for the acoustic transfer characteristics of the through-hull piping system is proposed, which can be used for the evaluation of the acoustic transfer characteristics of the system piping in the frequency band of 5Hz-1000Hz in the preliminary design stage of the through-hull system.

The invention discloses a fractional order circuit and a method for adjusting parameters of the fractional order circuit. The fractional order circuit comprises a signal processing circuit module, a negative voltage current source circuit module and a current sampling and displaying circuit module. The signal processing circuit module is used for receiving the adjusted bias current signal; the signal processing circuit module is also used for adjusting bias current values input into the N groups of operational amplifier circuits according to the adjusted bias current signals so as to adjust zero point values and pole point values of the N groups of operational amplifier circuits, so that the frequency range capable of meeting the fractional order property is enlarged; and / or, adjusting the proportion of the bias current values input into the N groups of operational amplifier circuits according to the adjusted bias current signals so as to adjust the amplitudes of the N groups of operational amplifier circuits, the supported external signal voltage range is enlarged; and the signal processing circuit module is also used for processing an external input signal according to the adjusted N groups of operational amplifier circuits to obtain an output signal, and the output signal is a signal meeting the fractional order property.

The invention relates to a noise reduction method and device for an automobile multi-motor system, a storage medium and a vehicle. The method comprises the steps that when a first motor and a second motor are both in a running state, the noise frequency and state parameters of the first motor and the noise frequency and state parameters of the second motor are obtained; according to the specific frequency parts of the two motors, harmonic current acting on the other motor is generated in combination with the state parameters of the other motor; and for the common frequency part of the two motors, the phases of the first motor and the second motor on the common noise frequency are controlled to be opposite based on a conventional mode. Compared with the prior art, noise reduction is achieved through pairing of the two motors, the unique frequency and the common frequency are processed respectively, the frequency range capable of being subjected to noise reduction can be greatly widened, and then the vehicle noise is better reduced.

The invention discloses a flow field conversion mechanism and a refrigerating machine with the same, and belongs to the technical field of refrigerating machines, the flow field conversion mechanism comprises a rotor part and a stator part, the rotor part is provided with a first counter bore and a second counter bore which are annularly distributed, the radial size of the first counter bore is larger than that of the second counter bore, and the stator part is provided with a stator. A first direct current counter bore communicated with the second counter bore is formed in the center of the rotor part; the stator part is provided with a first deep hole and a second through hole, the position of the first deep hole corresponds to the position of the proximal end of the first counter bore, the position of the second through hole corresponds to the radius position of the second counter bore, and the stator part is further provided with a first direct-current through hole matched with the first direct-current counter bore. The refrigerating machine comprises the flow field conversion mechanism, the flow field conversion mechanism serves as a middle structure of the refrigerating machine and a compressor, airflow exchange between the refrigerating machine and the compressor is achieved, and direct-current airflow is converted into alternating airflow to be supplied to the refrigerating machine.

The invention relates to a bulk acoustic wave device (100) comprising a first electrode (1a) and a second electrode (2a) and a piezoelectric element (3a) arranged between the first electrode and the second electrode, the piezoelectric element being designed such that a first electromagnetic signal fed into the first electrode is converted into an acoustic signal in the piezoelectric element, the acoustic signal is inverted in the second electrode into a second electromagnetic signal. The piezoelectric element comprises at least two piezoelectric layers (31, 33) having polarity in the same direction and at least one intermediate layer (32a) between the at least two piezoelectric layers. The acoustic layer thickness of the piezoelectric layer and the acoustic layer thickness of the intermediate layer are respectively equivalent to odd times of the semi-acoustic wave length of an acoustic signal to be transmitted.

The invention discloses a DLL circuit, a control method and electronic equipment, and belongs to the technical field of electronic equipment. The DLL circuit includes a phase discriminator, a charge pump, a voltage-controlled delay line, and a processing unit. An annular oscillator in the voltage-controlled delay line carries out oscillation processing on an input clock signal and outputs an oscillation signal. Under the condition that the frequency of the oscillation signal does not meet the target frequency, the processing unit adjusts the load capacitance of the second delay unit of the ring oscillator until the target frequency is met, the ring oscillator is controlled to stop working, and the load capacitance of the first delay unit and the load capacitance of the second delay unit are equal to the load capacitance of the first delay unit in the voltage-controlled delay line. The voltage-controlled delay line delays an input clock signal and outputs a target clock signal. The phase discriminator outputs a phase difference signal according to the phases of the target clock signal and the input clock signal. The charge pump outputs a control voltage signal according to the phase difference signal. According to the invention, the adjustment range of the delay duration of the first delay unit is improved.

The invention discloses a front-end anti-interference system of a radio frequency receiver, and relates to the field of radio frequency anti-interference. The system comprises a power divider used for dividing a received antenna signal into a first low-frequency signal and a first high-frequency signal; the low-frequency signal processing module is used for receiving and preprocessing the first low-frequency signal and then outputting a third intermediate-frequency signal; the high-frequency signal processing module is used for receiving and preprocessing the first high-frequency signal and then outputting a fourth intermediate-frequency signal; and the combiner is used for receiving the third intermediate-frequency signal and the fourth intermediate-frequency signal and combining the signals into one path for output. Compared with the prior art, the preprocessing processes of the low-frequency signal and the high-frequency signal do not interfere with each other, the sensitivity and the anti-interference capability of the radio frequency receiver are improved, the frequency band range of the radio frequency signal preprocessed at the front end of the radio frequency receiver is enlarged, and feeder lines are saved.

A transducer structure (100) for an acoustic device comprising a piezoelectric layer (104), a pair of inter-digitated comb electrodes (108, 110), comprising a plurality of electrode means (112_1, 112_2, 112_3, 112_4, 114_1, 114_2, 114_3, 114_4) with a pitch p satisfying the Bragg condition given by p= lambda / 2, lambda being the operating acoustic wavelength of said transducer, characterized in that the inter-digitated comb electrodes (108, 110) are embedded in the piezoelectric layer (104) and the acoustic impedance of the electrode means is less than the acoustic impedance of the piezoelectric layer such that, in use, the excitation of a wave propagating mode in the volume of the electrode means is taking place and is the predominant propagating mode of the structure. The invention relates also to a acoustic wave device comprising at least one transducer structure as described above and to a method for fabricating said transducer structure. The invention relates also to the use of the frequency of the bulk wave propagating in the electrode means of said transducer structure in an acoustic wave device to generate contribution at high frequency, in particular above 3GHz.

The application provides a four-mode voltage-controlled oscillator, comprising four kernel units, one kernel unit is composed of two cores, and the whole is an eight-core structure, four different modes are generated to achieve a double-octave tuning range. The application benefits from a completely magnetically induced mode, which does not use additional capacitors, and finally realizes a high figure of merit (FoM) in the ultra-high frequency range, enhancing the frequency range of the PLL. The application is based on an eight-core four-mode wide tuning VCO structure of 8-shaped inductors, which skillfully uses the magnetic field coupling and inductance evanescent scheme to tightly couple the eight cores together, achieving super-multi-core and super-wide tuning range without losing additional area. It has a wider frequency adjustment range, smaller area and lower power consumption.

The invention discloses a synchronous electric drive NVH optimization method, device and equipment and a medium, and the method comprises the steps: obtaining the reference frequency of a vehicle motor in a vehicle operation process, and judging whether the reference frequency is in a preset variable carrier frequency region or not; if yes, randomly generating a first random number, and determining a random carrier frequency according to the first random number, the reference frequency and a set carrier frequency change amplitude; according to the first random number, the random carrier frequency and a set carrier amplitude, determining a first loading slope of a first half period carrier and a second loading slope of a second half period carrier in a current carrier period to obtain a first carrier; and comparing the first carrier wave with a first modulated wave, and outputting an optimized PWM signal, the first modulated wave being generated according to the first carrier wave.