134 results about "Frequency Unit" patented technology

The invention discloses a receiving anti-interference gain control method of a satellite internet radio frequency unit, which belongs to the field of communication, and comprises the following steps of: detecting the total signal power in a full bandwidth and the effective signal power in a target bandwidth in real time in the operation process of equipment, and when the total signal power exceeds a set power threshold and enters a saturation state, sending the effective signal power to the satellite internet radio frequency unit; the total signal power is controlled below the threshold power by adjusting the attenuation amount of the attenuator, and saturation of a receiving channel is prevented; meanwhile, the difference value between the total signal power and the effective signal power is detected, when the difference value exceeds a set threshold value, it is judged that strong out-of-band interference exists, and useful signal attenuation caused by suppression of the out-of-band interference is compensated by adjusting the digital gain DigialGain.

The invention relates to the technical field of array antennas, and discloses a common-caliber layout-based ultra-wideband array antenna, which comprises a low-frequency unit and a high-frequency unit which are arranged based on a common caliber, and is characterized in that the working frequency of the low-frequency unit covers an fmin-f0 frequency band, and the working frequency of the high-frequency unit covers an f0-fmax frequency band. The low-frequency unit is a broadband dual-polarized antenna, a uniform tight coupling array distributed at equal intervals is formed by adopting a tight coupling principle, and the unit interval is calculated based on a grating lobe suppression condition at the frequency f0. The high-frequency unit is a miniaturized broadband dual-polarized antenna and adopts a sparse array form; the initial unit spacing and the unit number of the sparse array are calculated based on the grating lobe suppression condition at the highest frequency f2 of the f1-f2 frequency band with the side lobe requirement between the f0-fmax frequency bands. The ultra-wideband array antenna gives consideration to full-band array performance, can provide sufficient space for active circuit arrangement, and effectively reduces power consumption and cost.

The invention relates to the technical field of project supervision informatization, and provides a supervision multi-heterogeneous system cloud edge collaborative adaptation method, which comprises the following steps: collecting heterogeneous information such as edge equipment hardware architecture and an operating system to generate records; integrating supervision monitoring data and cloud instructions, classifying the data according to functions and updating frequencies, and marking high-frequency units; unifying a data format and adding Hash verification information; the cloud constructs a three-dimensional mapping table, and edge nodes are grouped in combination with high-frequency data; converting the private protocol of the edge device into a general protocol; by taking minimization of transmission quantity and energy consumption as a target, distributing tasks by using an integer linear programming model; dynamically adjusting the equipment energy consumption; and dynamically optimizing the configuration based on the interface indexes. The cloud edge interaction efficiency can be improved, the energy consumption is reduced, and the reliable operation of supervision business is ensured.

The invention relates to the technical field of underwater azimuth detection and positioning, in particular to an underwater positioning method and positioning system based on TF-GSC acoustic signal enhancement. Comprising the following steps that a plurality of underwater transducer arrays are arranged on the periphery of an area where a target object is located, and reference sound signals are periodically and actively emitted; the target object receives the emission signal, preliminary spherical positioning is carried out according to the time difference of arrival, and rough position estimation of the target object is obtained; each underwater transducer array performs STFT decomposition on an echo signal of a target object, time-frequency units are divided on a time-frequency two-dimensional plane, and a TF-GSC algorithm is executed on each time-frequency unit; the SNR of the enhanced signal is used as feedback, the array beam direction and weight are dynamically adjusted, and the receiving effect is further optimized; and carrying out global convergence judgment by utilizing a cross-iteration period. According to the method, the target extraction capability and the interference suppression effect of underwater positioning can be improved, so that the accuracy of underwater positioning is improved.

The invention relates to a level measuring device (1) for determining a level (L) of a filling material (2), which comprises the following components: - A high-frequency unit (10) for generating and transmitting radar signals (S HF ) along a beam axis (a) towards the filling material (2), and for receiving corresponding reception signals (R HF ) after reflection at the product surface, - an evaluation unit for determining the fill level (L) based on the received signal (R HF ), and - two radar lenses (11, 12) arranged one behind the other in the beam axis (a). According to the invention, the apertures of the radar lenses (11, 12) are selected such that their distance (b 11 + f 12 ) to each other the sum of the image distance (b 11 ) of the first radar lens (11), and the focal length (f 12 ) of the second radar lens (12). This allows the radar signals (S HF , R HF) through a thermally insulating housing neck (131). Furthermore, the inventive design of the apertures within the housing neck (131) allows a radar window (14) serving as explosion protection to be arranged in such a way that the beam guidance is only minimally restricted.

The invention provides an intelligent voice control system and a voice enhancement method in a reverberation environment. The method comprises the following steps: acquiring an initial voice signal in the reverberation environment; determining reverberation energy distribution in each frequency band according to the time-frequency spectrogram of the initial voice signal and the frequency response attenuation curve in each frequency band, and determining reverberation suppression gain of the initial voice signal in a time-frequency domain through all reverberation energy distribution; performing reverberation suppression on the initial voice signal according to the reverberation suppression gain to obtain a voice signal after reverberation suppression; performing time-frequency mask estimation on the initial voice signal to obtain a time-frequency mask of the initial voice signal, and determining residual interference energy of each time-frequency unit of the initial voice signal in a time-frequency domain according to the time-frequency mask and an interference covariance matrix of the target sound source; and performing harmonic enhancement on the voice signal after reverberation suppression through all residual interference energy to obtain a voice enhanced signal. By adopting the scheme of the invention, the acoustic crosstalk caused by reverberation can be suppressed.

The invention relates to the technical field of wireless carrier communication, in particular to a cluster unmanned aerial vehicle mixed signal separation and identification method, which comprises the following steps of: extracting a receiving strength time sequence from a received cluster unmanned aerial vehicle mixed wireless carrier communication signal, and calculating the sum of absolute values of difference values between continuous points of the sequence under a plurality of time scales, and linear fitting is carried out to establish a mixed channel fractal dimension. According to the method, difference absolute value accumulation and calculation under a plurality of time scales are carried out on a mixed wireless carrier communication signal receiving strength sequence, a mixed channel fractal dimension is established, and the fractal dimension is utilized to realize adaptive setting of an analysis window length and a stepping amount, so that the time-frequency resolution capability of subsequent segmented Fourier transform is improved; after a mixed signal time-frequency spectrogram is generated, a complete discrete time-frequency trajectory set is constructed through multi-frequency unit peak energy detection and association along a time axis, and unmanned aerial vehicle signals with closely overlapped frequencies can be distinguished.

Techniques are described for configuration and / or transmission of reference signals. An example wireless communication method includes transmitting, by a first network device, a first reference signal to a second network device, where the first reference signal is transmitted on N occasions, where each of the N occasions is based on a first set of time domain resources and a first set of frequency domain resources of the first reference signal, where each of the N occasions includes X time units in time domain and Y frequency units in frequency domain, and where N, X, and Y are integers greater than or equal to 1; and receiving, by the first network device from the second network device, a measurement report in response to the transmitting the first reference signal.

A communication method and apparatus, which relate to the technical field of communications. In the method, a first communication apparatus can acquire a first precoding matrix, wherein the first precoding matrix comprises a first sub-matrix corresponding to a first spatial stream and a second sub-matrix corresponding to a second spatial stream, the vector, which corresponds to a first time-frequency unit in the first sub-matrix, being a first vector, and the vector, which corresponds to a first time-frequency unit in the second sub-matrix, being a second vector; the first communication apparatus calibrates the first precoding matrix to obtain a second precoding matrix, wherein the second precoding matrix comprises a third sub-matrix corresponding to the first spatial stream, the vector, which corresponds to a first time-frequency unit in the third sub-matrix, being a second vector; and the first communication apparatus sends first information, wherein the first information is obtained by means of compressing the second precoding matrix. The method can improve the compression efficiency of channel information (such as a precoding matrix) and improve the feedback performance of the channel information.

The present application provides a communication method and a related apparatus. The method comprises: a terminal device finds, from first configuration information, a sampling sequence and a comb offset corresponding to a first antenna port. Then, on the basis of the sampling sequence corresponding to the first antenna port and the comb offset corresponding to the first antenna port, the terminal device determines frequency domain positions of N frequency units corresponding to the first antenna port, and sends a first reference signal sequence by means of the frequency domain positions of the N frequency units corresponding to the first antenna port, N being an integer greater than or equal to 2. The N frequency units corresponding to the first antenna port are arranged at non-uniform intervals, which helps reduce interference and improve channel estimation performance. For example, when a communication system needs to support a large number of antenna ports and / or channel delay is large, if the N frequency units corresponding to the first antenna port are arranged at non-uniform intervals, interference can be eliminated by means of methods such as filtering, thereby improving channel estimation performance.

This invention discloses a hospital mobile internet message push system based on a WeChat service account, relating to the field of mobile internet technology. A data entry and collection module is responsible for entering the current patient's medical records and obtaining the patient's past medical records. An evaluation message push update frequency unit calculates and outputs the current update frequency GP. A message push priority measurement unit calculates and outputs the push priority YJ. An update frequency push adjustment unit receives the update frequency GP and push priority YJ as inputs and calculates and outputs an adjustment coefficient GT. An execution push adjustment module adjusts the message push according to the adjustment coefficient GT. A blockchain node module runs, stores, and verifies the data entered, calculated, pushed, and updated on each node of the blockchain. This invention, by combining blockchain technology, realizes real-time updates of patient health data, priority calculation of message pushes, and dynamic adjustment of blockchain message verification and update frequency.

The embodiment of the invention provides a communication method and an application device, which can be applied to the field of satellite communication, such as NTN. The method comprises: a terminal device determining a first interleaving mode of a plurality of time-frequency units, the plurality of time-frequency units corresponding to a first OCC sequence, the plurality of time-frequency units being used for bearing first data expanded by the first OCC sequence; and the terminal device sends second data on the plurality of time frequency units, wherein the second data is data interleaved by the first data in the first interleaving mode. By adopting the embodiment of the invention, the anti-interference performance of the terminal device for sending the information can be improved, the interference of other terminal information on the network side is reduced, and the system performance and the system capacity can be improved.

The application discloses a variable frequency air source heat pump frost control operation method based on a frost control performance graph, and belongs to the technical field of frost control. First, a variable frequency unit frost control performance graph under a current working condition is drawn. Second, according to a heating capacity range and a frost control potential reflected by the frost control performance graph, a heating target and a frost control operation target are determined according to a building load demand at the moment. Third, a compressor frequency and an outdoor fan frequency of the variable frequency air source heat pump are determined according to the above demand and target. Finally, the compressor and the fan frequency output are controlled by a unit frost control operation controller, so that the heating and the frost control demand are realized. On the basis of meeting the heating capacity, effective frost control operation of the unit is realized.

Provided in the present application are a channel information feedback method, a channel information receiving method, and related apparatuses. The channel information feedback method provided in the present application comprises: a terminal device receiving first indication information, wherein the first indication information is used for indicating M space-frequency units for which the terminal device feeds back channel information, M being an integer greater than or equal to 1; and then, on the basis of the first indication information, the terminal device sending the channel information of the M space-frequency units, wherein the channel information of the M space-frequency units is obtained by means of measuring a first reference signal, the first reference signal is carried on N space-frequency units, and the M space-frequency units are some or all of the N space-frequency units, with N being an integer greater than or equal to 1. Therefore, a network device can conveniently perform inference on the basis of the channel information of the M space-frequency units, so as to obtain channel information of the N space-frequency units. A terminal device directly feeds back channel information of some space-frequency units, without the need to perform eigenvalue decomposition and DFT calculation on a downlink measurement channel so as to obtain a precoding matrix. Therefore, the terminal complexity is reduced.

The application discloses a protection and distortion control method and system during sound operation, and relates to the technical field of audio processing. An audio signal and a reference signal are acquired; the reference signal is preprocessed to obtain a trigger signal of a level effective value; a trigger threshold is acquired according to the trigger signal of the level effective value; the trigger threshold is adjusted to obtain a preset trigger threshold; the preset trigger threshold is dynamically adjusted according to a voltage value corresponding to a frequency of the audio signal to obtain a voltage value corresponding to the preset trigger threshold; and the audio frequency corresponding to the voltage value corresponding to the preset trigger threshold is a protected and distortion-controlled audio signal. The application realizes dynamic change of a high-frequency cutoff frequency of an audio high-frequency unit while maintaining the loudness of a sound field restoration of a sound system, and improves the protection and distortion control accuracy of the sound in a limit operation state of high power and long time.

The invention discloses a hybrid echo cancellation method and system based on depth filtering and frequency band weighted loss, and the method comprises the steps: carrying out the preprocessing of a microphone signal and a reference signal through a low-complexity linear echo cancellation preprocessing module, and outputting an error signal; the three paths of input are sent to a hybrid conditional filter network (HHF-Net); complex domain time-frequency features are extracted through an encoder, and a complex time-frequency spectrum is recovered through a decoder after bottleneck layer modeling; a depth filtering module learns a complex filter coefficient for each time frequency unit, and suppresses echo through causal two-dimensional convolution; a mixed loss function training model of frequency band weighted amplitude loss and scale invariant signal-to-noise ratio (SI-SNR) loss is adopted. The problems of target voice information loss, poor output voice listening feeling and overlarge model parameter quantity in a double-talk scene are solved, an average opinion score (MOS) index is remarkably improved, and echo components are effectively inhibited while voice distortion is reduced.

The invention relates to a radar-based level measuring device (1) which operates in several, clearly different frequency bands (f 1,2,3 ) can measure and for this purpose comprises a corresponding number of high-frequency units (10, 11, 12). One of the high-frequency units (10) is designed to measure the radar signal (S) in the respective frequency band (f1). HF1 ) along a defined transmit / receive axis (a) towards the filling material (2) and, after its reflection at the surface of the filling material, a corresponding first received signal (R) HF1 ) to be received via this transmit / receive axis (a). The radar signals (S,R) HF2,3 ) all other frequency bands (f 2,3 ) or all other high-frequency units (11, 12) are deflected into the transmit / receive axis (a) via a reflector arrangement (111, 112; 121, 122) according to the Cassegrain principle, with an evaluation unit selecting the appropriate frequency band (f 1,2,3) determines the fill level (L). An advantage of this is the compact design of the level measuring device (1), without interference in any of the frequency bands (f 1,2,3 Compromises regarding bundling and transmission efficiency must be made.

The invention belongs to the technical field of common-caliber antennas, and discloses a broadband low-profile dual-frequency common-caliber phased array antenna based on metasurface multiplexing, and the phased array comprises a metasurface array and a feed structure located below the metasurface array. According to the common-caliber phased array, the metasurface array is multiplexed, and a * b * e * f (c * d * g * h) metasurface units are utilized to form a radiation structure of a * b low-frequency units and c * d high-frequency units. The array structure is compact, and the frequency ratio can be flexibly adjusted by changing the proportion of the metasurface units. The array feed structure is arranged below the metasurface unit, and high isolation and various polarizations can be realized by changing the feed structure and arrangement of the a * b low-frequency antenna units and the c * d high-frequency antenna units. According to the invention, by multiplexing a set of metasurface array, the common-aperture design of the compact low-profile broadband is realized, and the aperture utilization rate and the scanning range of the array beam are improved.

The application discloses a control method for primary frequency modulation in a power dead zone range of a hydroelectric generating set, and belongs to the technical field of hydroelectric generating set regulation. The method comprises the following steps: S1, calculating H1 and H2 of a water diversion system according to the water flow inertia time constant of the water diversion system and the mechanical inertia time constant of the generating set; S2, calculating a dynamic analytical expression of the generating set power when a frequency unit step disturbance occurs; S3, calculating a first-order differential link coefficient decomposed by a second-order correction link based on the dynamic analytical expression of the generating set power; and S4, calculating the output of a PID speed regulator in a current sampling period. The scheme calculates the oscillation link transfer function parameters in a dynamic process, and a second-order system correction transfer function of a frequency given value is designed on the basis, so that the oscillation phenomenon of the generating set power does not occur when the frequency given value of the generating set changes, the problem that the power exceeds the power dead zone in the dynamic process is prevented, and a limiting link is arranged at the frequency deviation value to ensure that the power steady-state value exceeds the power dead zone range.

The invention provides a power distribution network fault positioning method and device, equipment, a medium and a program product. According to the method, after abnormal current data sent by at least one target current transformer and tripping data sent by a target protection switch are obtained, the tripping data of the target protection switch are obtained according to abnormal current in the abnormal current data and obtained power transmission voltage, power transmission frequency, resistance per unit length and inductance per unit length; determining a fault point distance corresponding to each target current transformer; and determining the position of a target fault point in combination with the number of the target current transformers, the identifier of each target current transformer, a preset power distribution network circuit diagram and tripping data. According to the scheme, the fault point distance is determined through the abnormal current data sent by the target current transformer, the target fault point position is determined by combining the number of the target current transformers and the tripping data, manual positioning is not needed, and the positioning efficiency is improved.

The invention relates to an easily manufactured, heat-resistant and explosion-proof level measuring device (1) for high-precision level measurement, which comprises the following components: An IC-based high-frequency unit (10) which is designed to receive radar signals (S HF ) at 100 GHz or more and to radiate them along a beam axis (a) towards the filling material (2) and, after their reflection at the filling material surface, to generate corresponding reception signals (R HF ), An evaluation unit which, at least based on the received signal (R HF ) determines the fill level (L). According to the invention, the fill level measuring device (1) is characterized by a potting enclosure (11) that encapsulates the high-frequency unit (10) and simultaneously includes a radar lens (111) arranged in the beam axis (a). This minimizes the number of components and simplifies the adjustment of the IC in relation to the radar lens (111).

The invention relates to an FMCW-based level measuring device (1) that can operate in two clearly distinct frequency bands: For this purpose, the level measuring device (1) comprises two high-frequency units (11, 12) each with a frequency-controllable oscillator (111, 112) in order to transmit radar signals (S) in the frequency bands according to the FMCW principle. HF1,2 ) to generate or, after reflection from the surface of the contents, to receive. An antenna arrangement (13) serves to transmit and receive the radar signals (S HF1, 2) towards the filling material (L) and for reception after reflection at the filling material surface, wherein a control / evaluation unit (14) is used based on the received signal (R) HF1,2The level measuring device (1) can determine the fill level (L) using the first or second frequency band. According to the invention, the level measuring device (1) is characterized by a common clock unit (15). This unit serves to form a phase-locked loop with both the first oscillator (111) and the second oscillator (121) in order to generate the corresponding radar signals (S) according to the FMCW principle. HF1,2 , R HF1,2 ) of both frequency bands. This eliminates the need for a complete phase-locked loop for each frequency band. As a result, the number of required components is reduced.

This invention discloses a hybrid ANPC three-level inverter unit, including a frame, terminal blocks fixed on the frame, a water-cooled inverter unit, an input filter unit, a supporting capacitor, and a sensor. The switching transistors in the low-frequency unit are Si devices, and the switching transistors in the high-frequency unit are SiC devices. An inverter is also disclosed. This invention, through the hybrid arrangement of Si and SiC devices, can ensure the performance of the three-level inverter unit, achieve low switching losses of the switching devices, and fully utilize the advantages of the two different types of devices. The small size of the heat sink and the low cost of the device, along with the modular design, have outstanding advantages such as high integration, high power density, and good maintainability.

The invention provides an AiP packaging structure based on a cavity tube shell, which belongs to the technical field of electronic packaging and comprises a substrate with a plurality of metalized through holes, a chip bonded on the substrate, the cavity tube shell packaged on the chip and antenna radiation units integrated on the inner surface and the outer surface of the cavity tube shell. The cavity tube shell is provided with a packaging cavity for packaging the chip, and the periphery of the cavity tube shell is packaged on the substrate; the antenna radiation unit is connected with the chip through a metal line. The antenna radio frequency units are integrated on the inner surface and the outer surface of the cavity tube shell, double-layer surface-mounted packaging is formed, the transmission efficiency can be improved, and the requirement for high-frequency and high-speed transmission is met; the antenna radio frequency unit is directly integrated on the cavity tube shell, the cavity structure can reduce dielectric loss in signal transmission, and the high-frequency transmission performance of the antenna is improved; and moreover, the number of parts is reduced, the structure is simplified, the packaging size can be reduced, and the requirements of increasingly miniaturization and high integration level of the antenna can be met.

The invention relates to the technical field of artificial intelligence and machine learning, and discloses a method and a system for realizing broadband noise point identification of an automobile audio based on time-frequency analysis, and the method comprises the steps: adding a variable-length window function of an audio analysis fragment, obtaining a windowed audio analysis fragment, analyzing an initial time-frequency spectrum of the windowed audio analysis fragment, and obtaining an initial time-frequency spectrum of the windowed audio analysis fragment; generating an instantaneous frequency estimation matrix of the windowed audio analysis segment; combining the instantaneous frequency estimation matrix with the initial time-frequency spectrum to obtain enhanced time-frequency representation of the windowed audio analysis fragment, analyzing noise time-frequency units of the enhanced time-frequency representation, and communicating the noise time-frequency units to obtain a broadband noise point candidate region of the windowed audio analysis fragment; and analyzing the real noise point probability of the broadband noise point candidate region, and determining broadband real noise points of the broadband noise point candidate region. According to the invention, the efficiency and accuracy of automobile audio broadband noise point identification can be improved.

This invention discloses a simulation method and system for the operation of a variable frequency drive unit in a refrigerated container. The method includes constructing a simplified simulation model and setting initial system parameters; periodically calculating the real-time values ​​of evaporation and condensation pressures based on refrigerant flow balance using the simplified simulation model; determining the target evaporation pressure based on the operating mode and the container temperature, and dynamically adjusting the opening value of the electronic expansion valve using a proportional-integral (PI) control algorithm based on the real-time evaporation pressure to bring the evaporation pressure close to the target evaporation pressure; calculating the periodic change in the container temperature based on the compressor speed, evaporator fan speed, and container temperature control deviation, and obtaining the return air temperature and supply air temperature based on the container temperature; and finally displaying the results through a human-machine interface. This invention effectively overcomes the problems of high maintenance and testing costs, unintuitive teaching simulations, lack of process control logic, and difficulties in simulating advanced functions in existing technologies.

The invention discloses an aircraft internal wireless data transmission system and method, and the system comprises a multipath sensor signal collection module which collects an analog signal through a single-chip microcomputer integrated with an ADC, and converts the analog signal into a voltage signal through a conditioning circuit; the wireless communication module wirelessly transmits a signal and binds an independent IP identification type for the sensor through the wireless module and the pasted coaxial feed antenna; the video and telemetry data mixed transmission module is used for compressing the video by using an MPEG4 standard and embedding the telemetry data into a compressed video code stream DCT domain high-frequency unit; according to the electric energy and information integrated transmission module, through a bilateral LCC compensation topology magnetic coupling coil, the same coil synchronously transmits electric energy and information, the coil is subjected to forward modeling and reverse parameter optimization design, efficient integrated transmission is achieved, and the requirement for internal data transmission of the aircraft is met.

The present application relates to image processing technology, specifically relates to a kind of infrared light field image super-resolution method and equipment based on frequency correlation, the method proposes IRLF FSR network, SAI is decomposed into high frequency and low frequency component, to decouple non-uniform noise and structure;Again, the correlation between these high, low frequency components is learned by frequency unit and frequency unit.The dependence of adjacent pixels is modeled in frequency unit, to help roughly reconstruct structure and suppress non-uniform noise, while frequency unit is used to learn the content correlation between two frequency components, help reconstruct fine authorized structure and suppress residual noise.In two units, triple attention mechanism is embedded to make full use of spatial, angle and frequency information, and the spatial angle, spatial frequency and angular frequency correlation are jointly modeled by self-attention.The method solves the problem of over-smoothing and artifact caused by non-uniform noise and structure coupling, and the structure is clearer and the artifact is less.

The application discloses a satellite navigation signal time delay stability control method and system, and the system comprises a reference time-frequency unit, a navigation signal generation unit, a navigation signal broadcasting system, a load management unit, a switch matrix, a navigation signal receiving unit and a constant temperature control unit; by establishing high-stable-state navigation signal receiving capability in the satellite load, real-time measurement of the time delay of the navigation signal is realized, and closed-loop time delay adjustment is formed with the navigation signal generation, so that the control of the navigation signal time delay stability is achieved.

The utility model discloses a column loudspeaker and an intelligent device, and the column loudspeaker comprises a housing which is provided with a plurality of full-frequency units and at least one high-frequency unit. The sound output normal of the at least one high-frequency unit and the sound output normal of the at least one full-frequency unit are arranged in different directions. In the above design, the housing is provided with a plurality of full-frequency units and at least one high-frequency unit, and the high-frequency unit can compensate the high-frequency loudness loss of the full-frequency units, thereby effectively improving the full-frequency effect, enabling the loudspeaking sound to have a stronger layering sense, and improving the sound quality. And the sound output normal of the high-frequency unit and the sound output normal of the full-frequency unit are arranged in different directions, so that sound transmission in a larger direction range can be realized, sound diffusion is stronger, namely, a sound field in a larger range is generated, the sound column loudspeaker has a better hearing effect, and a user can obtain better experience.